Baltimore city, MD Building Permits, Zoning & Septic Rules

Baltimore City, Maryland requires a building permit for nearly any construction, alteration or demolition, and the whole city is zoned under the Transform Baltimore code, right down to the block¹². This is Maryland's only independent city and its densest jurisdiction, so there is no unincorporated rural land here the way there is in a typical county: buildings with plumbing fixtures generally must connect to public water and sewer, and living in an RV on your land is against city code³⁴. The closest thing to a large-lot, rural-feeling parcel is a detached home in an R-1A district, which requires a 2-acre lot⁵.

At a glance

Building permit: Required citywide for most construction, alteration or demolition¹
Zoning: Yes, citywide under the Transform Baltimore code²
Septic: Public sewer required; private septic only with written Code Official permission⁶
RV living: Prohibited citywide⁴
Owner-builder: Owner-performed home improvements may qualify; permits still apply⁷
Minimum lot size (detached home): 2 acres in R-1A down to 3,000 sq ft in R-4⁵
Minimum dwelling size: 240 sq ft of clear floor area⁸
Private well: Permit required through a Maryland-licensed well driller⁹

Who to call

Building permits

Baltimore City Department of Housing and Community Development (DHCD) — Permits Office

Building, electrical, mechanical, gas and plumbing permits, plan review and inspections citywide; the Building Official also decides whether a private septic system may be installed

443-984-1809

[email protected]

417 E. Fayette Street, Room 202, Baltimore, MD 21202

Online permits →

Zoning

Baltimore City DHCD — Zoning Office

Zoning permit questions during the permit process; the Department of Planning's zoning code and district maps set the underlying rules

410-396-4126

417 E. Fayette Street, Room 202, Baltimore, MD 21202

Online permits →

Septic permits

Maryland Department of the Environment (MDE) — Onsite Systems Division

Statewide onsite sewage disposal (septic) and well-construction program; in Baltimore City, a private system additionally needs the DHCD Building Official's written permission because public sewer connection is otherwise required

410-537-3599

1800 Washington Blvd, Baltimore, MD 21230

Contact details are copied from each office’s official page and were checked against it on October 1, 2026.

Do you need a building permit in Baltimore City, Maryland?

Baltimore City requires a permit issued by the Building Official before you construct, enlarge, alter, repair, rehabilitate, demolish or move a structure, install or replace electrical, gas, mechanical or plumbing systems, change the use of land or a structure, or grade or excavate¹¹⁰. A handful of interior finish jobs are exempt, such as painting, papering, tiling, carpeting, cabinets, countertops and replacing roof shingles, but the exemption depends on the specific work and other applicable law, so confirm before you skip a permit¹⁰. For a qualifying home improvement, an owner may perform the work personally, and the contractor definition excludes the owner's employee; this does not cover new-home construction or waive the required permit or separate trade licenses⁷. Baltimore City sets its own building-permit rules under its own city code rather than the general county-building statute most Maryland counties use, since state law specifically excludes Baltimore City from that statute¹¹.

Who is the Baltimore City building department, and how do you reach them?

DHCD's Permits Office issues building, electrical, mechanical, gas and plumbing permits and runs inspections citywide¹². Reach the office at 443-984-1809 or [email protected], at 417 E. Fayette Street, Room 202, Baltimore, MD 21202, or apply online through the city's E-Permits portal¹². Zoning questions during the permit process go to the DHCD Zoning Office at 410-396-4126, while the Department of Planning publishes the zoning code itself and its district maps¹³². All permits require inspections, and every work permit needs a final inspection before the city issues a Certificate of Occupancy — for a new building or addition, expect footing, foundation, slab, framing, insulation and final inspections in sequence¹⁴. Fees vary by project: a plan review application without construction documents starts at $25 for a 1- or 2-family dwelling, and a new building permit for that same dwelling runs $10 per 1,000 cubic feet with a $150 minimum¹⁵.

Does Baltimore City have zoning, and what does that mean for a large lot?

Every parcel in Baltimore City sits in a zoning district under the Transform Baltimore code, from open-space and residential districts through commercial and industrial ones, each shown on the adopted zoning map²¹⁶. If you want the largest lot the city's own zoning allows for a single detached home, that is the R-1A district, which requires a 2-acre minimum lot; other residential districts step down as low as 3,000 square feet for a detached or semi-detached home, 500 square feet for a rowhouse lot in R-10, and as little as 200 square feet per unit for multifamily in R-10⁵. Required yards (setbacks) and maximum lot coverage are also district-specific: detached and semi-detached residential districts allow 35% to 45% lot coverage for most uses, while some rowhouse and multifamily districts allow up to 100% coverage on a shallow lot backing an alley¹⁷¹⁸. An existing accessory carriage house that predates June 5, 2017 and has at least 350 square feet can be converted into its own single-family detached dwelling in a Residential or OR district, without enlarging its footprint or height by more than 20% — a legal way to add a second home on one lot¹⁹. Separately, Maryland now requires every local government to adopt its own law authorizing accessory dwelling units on land with a single-family detached home by October 1, 2026, so Baltimore City's ADU rules may expand soon beyond the carriage-house rule²⁰.

How does septic and water work in Baltimore City?

Baltimore City requires a building with plumbing fixtures to connect to public water and public sewer unless a state discharge permit authorizes otherwise, so a private well-and-septic setup is an exception rather than the default³. A private septic tank system may only be installed with the written permission of the city's Building Official, and an approved system must still meet Maryland's onsite sewage disposal rules⁶. Maryland requires an Approving Authority permit before construction of an onsite sewage disposal system, and the system must be inspected and approved before it is covered or used²¹²². A regulated well also requires a permit: a Maryland-licensed well driller submits the application to the local approving authority and files a completion report after drilling⁹. A potable well needs a Certificate of Potability based on laboratory testing before it enters service⁹. Contact DHCD's Building Official first about a private septic proposal and ask MDE's Onsite Systems Division which local approving authority will handle the well application¹²²³.

Can you live in an RV or tiny home on your land in Baltimore City?

No, Baltimore City's code is explicit: no recreational vehicle may be used for living, sleeping or housekeeping purposes anywhere in the city, whether that is a short camping stay or a longer-term setup⁴. An RV can be stored on residential-zoned private property only inside a fully enclosed structure, or on a paved surface in the rear yard at least 3 feet from the side and rear lot lines, and it must stay mobile, in good repair, and currently licensed and registered⁴. A tent can go up in a residential rear yard for up to 5 consecutive days without a temporary-use permit, but that is not a housing solution²⁴. This guide could not confirm a specific Baltimore City rule addressing tiny-home occupancy; any tiny home you place would still need to meet the city's 240-square-foot minimum dwelling floor area and the zoning and building-permit rules that apply to any other dwelling, so check with DHCD's Permits Office before you plan one⁸¹².

Building or buying in Baltimore City: the steps, in order

Look up your parcel's zoning district on the city's CityView mapping tool or through the Department of Planning's zoning code pages before you make an offer².
If you plan a detached home on a large lot, confirm which district (such as R-1A, at a 2-acre minimum) your parcel is zoned for, since that sets your minimum lot size, setbacks and lot coverage⁵.
Confirm the public water and sewer connections with DHCD before designing the project³¹².
For a private septic proposal, obtain the Building Official's written permission; for a regulated well, have a Maryland-licensed well driller apply to the local approving authority⁶⁹.
Create an E-Permits account and apply for your building permit, or visit the Permits Office in person at 417 E. Fayette Street, Room 202¹².
If your project involves a curb cut for a driveway, apply separately for a curb-cut permit from the Department of Transportation, subject to Planning Department review²⁵.
If your parcel is in the Floodplain District overlay, your building permit can only be granted after the required state and federal floodplain permits are obtained and verified by the Planning Department²⁶.
Schedule inspections as work proceeds — footing, foundation, slab, framing, insulation and a final inspection for new construction — through your E-Permits account²⁷.

What to check before you buy land in Baltimore City

Baltimore City is the densest jurisdiction Bolthole Index tracks, with about 6,983 people per square mile and the metro area essentially on top of you at about 1 mile away — this is a city purchase, not a rural one²⁸²⁹. A typical home here is valued around $189,179, well below the national picture, while farmland (where it exists at the city's edges) runs about $13,587 an acre³⁰³¹. The city sees about 47 inches of precipitation a year and has been in severe drought in only about 1.1% of recent years, among the lowest drought exposure this guide tracks³²³³. If you plan to rent out a property short-term, Baltimore City currently accepts new short-term-rental license applications only from hosted, owner-occupied properties, for a $200 fee renewed every two years³⁴. Budget for an effective property tax rate near 1.5%, a median bill around $3,236 a year, and a typical home insurance premium near $1,582 a year — lower than many suburban and rural counties this guide covers³⁵³⁶³⁷.

Watch-outs

Baltimore City has essentially no unincorporated rural land: every parcel is zoned, connects to public water and sewer by default, and living in an RV on it is against city code, so this guide is written for a city building or lot purchase, not a rural homestead²⁴.
This guide could not confirm a Baltimore City rule on tiny-home occupancy specifically; treat any tiny home as an ordinary dwelling subject to the 240-square-foot minimum and the standard permit and zoning process until you confirm otherwise with DHCD⁸¹².
A private septic system is the exception here, not the plan: public sewer connection is required unless the DHCD Building Official gives written permission for a private system, in addition to the state's own septic permit and inspection rules⁶²¹.

Sources

Written October 1, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.

How Baltimore City scores

Seclusion9100% ev.

Self-Sufficiency1588% ev.

Admin Boringness42100% ev.

Durability85100% ev.

Property Autonomy43100% ev.

Carry Cost50100% ev.

Evidence strength: 97%. This reports direct-source completeness and fallback use; it is separate from the score and is not a confidence interval. How it works →

$189kTypical home

1.5%Property tax

$13,587Land / acre

47"Annual rain

1.1% of yrsSevere drought

7.4 / yr (+6.5)Mid-century 100°F days

14 daysMid-century dry spell

2.56" (+7.7%)Mid-century 1-day rain

1.47×Wildfire change factor

100%Forward climate coverage

$1,582Home insurance / yr

2.2% / yrInsurance growth

0.83%Nonrenewal rate

county median (2+ published ZIPs)Insurance basis

1,735,697People within 30 min

17,851,348People within 2 hr

1,649,913Radius comparison (15 mi)

6,982.9People / sq mi

0.1%Federal land

87.3%Land at 15% slope or less

35.6%Septic soil without severe limits

15,787 acWorkable land screen

39.3 tonsBiomass / forest ac

56.8°FAvg temp

Answers from the rulebook for Baltimore City

What the ordinances and state agencies actually say — one answer per question, each quoted from the official source and independently re-checked.

Baltimore City rules

Zoning districtsPublished (with conditions)
Baltimore City zoning districts and incorporated zoning and floodplain maps under the Baltimore City Zoning Code.
- The City is divided into zoning districts listed in Title 6 and located on the adopted zoning map, floodplain overlay maps, and flood profiles.
- The zoning map, floodplain overlay maps, and flood profiles are incorporated into and made part of the Code.
- District boundaries and designations are determined under Title 6, Subtitle 3.
- Listed districts include open-space and environmental districts, residential districts, commercial districts, industrial districts, and special-purpose districts.
listed residential district examples: R-1A through R-4 and R-5 through R-10 · listed commercial district examples: C-1, C-1-E, C-1-VC, C-2, C-3, C-4, C-5 · listed industrial district examples: OIC, BSC, IMU-1, IMU-2, I-1, I-2, MI
“To carry out the purposes of this Code, the City is divided into zoning districts, as listed in this subtitle and located on the zoning map, floodplain overlay maps, and flood profiles adopted under this Code.”
Title 6 Zoning Districts; Maps and Profiles ↗Re-checked Sep 24, 2026
Driveway accessRequired
Constructing, widening, removing, or altering a driveway or curb cut in Baltimore City, including curb cuts for driveways.
- A curb-cut permit is issued by the Department of Transportation and is subject to review by the Department of Planning.
- For residential-, commercial-, and industrial-zoned properties, curb cuts are considered for specified situations including parking garages, parking lots with more than 5 spaces, and certain dwelling-unit access conditions.
- Existing or abandoned curb cuts do not guarantee approval for reuse unless there is an existing permit.
- The City may deny a curb-cut request regardless of whether side or rear access is available.
parking-lot threshold for listed curb-cut consideration: > 5 parking spaces
“Curb cuts for driveways require a curb-cut permit from the Department of Transportation, subject to review by the Department of Planning.”
§ 16-405. Curb cuts ↗Re-checked Sep 24, 2026
Building in a floodplainRequired
All development in the Baltimore City Floodplain District.
- A Building permit is required for all development in the Floodplain District.
- The Building permit may be granted only after necessary permits from the State Water & Science Administration and all applicable Federal, State, and City agencies have been obtained and verified by the Planning Department.
- New construction and substantial improvements must comply with the Floodplain Management Code and ASCE 24 and ASCE 7 Chapter 5, except as otherwise provided.
- Floodplain applications must be submitted by the owner or authorized agent to the Building Official and include applicant, owner, contractor, site, scaled plans, NAVD elevations, estimated cost, and copies of necessary agency permits.
- Depending on the project, an elevation certificate, certified elevation and grading information, professional-engineer or architect plans, and an appraisal for substantial improvements may be required.
- The Floodplain District is an overlay on any zoning district.
minimum flood-protection setback near an unmapped stream without a delineated base floodplain: >= 25 feet (State permits may be required and variances may be applied for.)
“A Building permit issued by the Building Official under the Baltimore City Building Code: (1) is required for all development in the Floodplain District; and (2) may be granted only after necessary permits from the State Water & Science Administration and all other applicable Federal, State, and City agencies have been obtained and verified by the Planning Department.”
Article 7 Natural Resources — Floodplain Management ↗Re-checked Sep 24, 2026
Short-term rentalsLimited
New short-term rental licenses for Baltimore City properties offered through the City's registration process.
- Only hosted (owner-occupied) properties are eligible to apply for a new STR license at this time.
- The application requires the property address, owner information as recorded on the deed, and a Maryland State Use and Sales Tax number.
- The application requires confirmation that the property is hosted/owner occupied and digital signature by the applicant.
- The fee is $200 and renewal is required every two years.
- Once payment posts, the license is generated and the expiration date is printed on the license.
- The official instructions do not establish a complete prohibition on all short-term rentals; they limit new licensing eligibility to hosted, owner-occupied properties.
short-term-rental license fee: 200 USD · license renewal interval: 2 years
“Only HOSTED (OWNER OCCUPIED) properties are eligible to apply for a new STR license at this time.”
Instructions for Completing a New Short-Term Rental Registration ↗Re-checked Sep 24, 2026
Permit feesPublished (with conditions)
Baltimore City building, alteration, demolition, moving, occupancy, inspection, and related permit fees.
- Fees must be paid before issuance of a permit, amendment, or extension.
- Additional fees may apply for water taps, sewer connections, electrical permits, signs, inspections, occupancy permits, and other requirements.
- Unless otherwise specified, the minimum fee or service charge is $25 and fees are rounded to the nearest dollar.
- Application fees are nonrefundable except as provided in City Code § 109.4.
- Specific fees vary by project type, building size or volume, affected area, estimated cost, inspections, and agency review.
minimum fee or service charge: >= 25 USD (Unless otherwise specified.) · application fee without construction documents for plan review, 1- and 2-family dwelling: 25 USD (Nonrefundable except as provided in § 109.4.) · application fee requiring construction documents for plan review, 1- and 2-family dwelling: 125 USD (Nonrefundable except as provided in § 109.4.) · new building permit fee, 1- and 2-family dwelling: per 10 USD per 1000 cubic feet (Minimum $150.) · new building permit fee, all other structures: per 20 USD per 1000 cubic feet (Minimum $250.)
“Fees or service charges for the various permits, certificates, inspections, tests, or other services provided under this Code are as specified in this § 109. Unless otherwise specified, the minimum fee or service charge is $25. All fees are to be rounded to the nearest dollar.”
Section 109. Fees ↗Re-checked Sep 24, 2026
Permit processPublished (with conditions)
Baltimore City permit inspection and certificate-of-occupancy process.
- All permits require inspections.
- All work permits require a final inspection before a Certificate of Occupancy can be issued.
- Inspection types vary by use and work type; examples include footing, foundation, slab, framing, insulation, and final inspections.
- Inspections are scheduled in the E-Permits account, with a 2:30 p.m. cutoff the day before the requested date.
- Health inspections require in-person application at the Baltimore City Health Department, a BUSE number, and a $150 inspection fee; the agency states the inspection will be scheduled within 48 hours.
health inspection fee: 150 USD (Credit-card service charge applies.) · inspection scheduling cutoff: 2:30 P.M. the day prior
“ALL PERMITS REQUIRE INSPECTIONS A Certificate of Occupancy requires the following inspections prior to issuance. All work permits must have a final inspection before a Certificate of Occupancy can be issued”
Inspection Guidelines and Other Permit Information ↗Re-checked Sep 24, 2026
County-wide zoningPresent
City is governed by the Transform Baltimore Zoning Code (Ord. 16-581), administered by the Department of Planning / Office of the Zoning Administrator.
Baltimore City Zoning Code ↗Scouted from the county site, not yet independently re-checked

Maryland rules that apply here

Building permitRequired
Implementation and enforcement of Maryland's building standards by each local jurisdiction statewide.
- Each local jurisdiction must ensure issuance of building permits as a minimum enforcement activity.
- The county generally implements and enforces the standards, subject to the statutory municipal-corporation exceptions in Public Safety Article § 12-505(b).
- A local jurisdiction determines the manner in which the minimum implementation and enforcement activities are carried out.
- A local jurisdiction may charge fees necessary to cover implementation and enforcement costs.
- This claim states the statewide minimum mandate; project-specific permit exemptions and local amendments may apply.
“At a minimum, the local jurisdiction shall ensure that implementation and enforcement of the Standards includes: (i) review and acceptance of appropriate plans; (ii) issuance of building permits; (iii) inspection of the work authorized by the building permits; and (iv) issuance of appropriate use and occupancy certificates. (3) Each local jurisdiction shall determine the manner in which the minimum implementation and enforcement activities of this subsection are carried out.”
Maryland Public Safety Article § 12-505 ↗Re-checked Sep 11, 2026
Owner-builder exemptionConditional
Maryland Home Improvement Commission contractor-licensing classification for an owner or the owner's employee performing a qualifying home improvement at a Baltimore City residential property.
- The statutory contractor definition excludes an employee of an owner; this supports owner self-performance or work by the owner's employee outside the statutory definition of contractor, but it is not a blanket exemption from all trade licensing or building permits.
- Baltimore City's official permit handbook expressly states that an owner performing the work must still obtain a permit when the work requires one.
- The statutory home-improvement definition covers additions, alterations, conversions, improvements, modernization, remodeling, repairs, replacements, and certain adjacent-land improvements.
- The statutory definition excludes construction of a new home, work under a guarantee of completion for a new building project, appliance connection or replacement requiring alteration of existing exposed plumbing lines, material sales without arranged installation work, work on apartment buildings containing four or more single-family units, and work on commonly owned condominium areas.
- Separate state or local licensing requirements may apply to electrical, plumbing, HVAC&R, gas, or other regulated trades.
““Contractor” means a person, other than an employee of an owner, who performs or offers or agrees to perform a home improvement for an owner.”
Maryland Business Regulation § 8-101 ↗Re-checked Oct 1, 2026
One more reviewed finding on this topic
- Conditional — Home-improvement permits for work performed by a property owner in a Maryland county or municipal corporation.
  “Except for a permit for a home improvement to be performed by a property owner”
  Maryland Business Regulation Article § 8-504 ↗Re-checked Sep 11, 2026
InspectionsRequired
Inspection of work authorized by building permits under Maryland's statewide building-standards enforcement mandate.
- Each local jurisdiction must include inspection of permitted work among its minimum implementation and enforcement activities.
- Each local jurisdiction determines the manner of carrying out the required inspections.
- The county generally implements and enforces the standards, subject to the statutory municipal-corporation exceptions in Public Safety Article § 12-505(b).
- A local jurisdiction may charge fees necessary to cover implementation and enforcement costs.
“inspection of the work authorized by the building permits; and”
Maryland Public Safety Article § 12-505 ↗Re-checked Sep 11, 2026
Certificate of occupancyRequired
Appropriate use and occupancy certificates issued through Maryland's statewide building-standards enforcement system.
- Each local jurisdiction must ensure issuance of appropriate use and occupancy certificates as a minimum enforcement activity.
- The statute uses the term 'appropriate,' so the requirement is tied to certificates applicable to the project and governing standards.
- Each local jurisdiction determines the manner of carrying out the minimum implementation and enforcement activities.
- The county generally implements and enforces the standards, subject to the statutory municipal-corporation exceptions in Public Safety Article § 12-505(b).
- A local jurisdiction may charge fees necessary to cover implementation and enforcement costs.
“issuance of appropriate use and occupancy certificates.”
Maryland Public Safety Article § 12-505 ↗Re-checked Sep 11, 2026
Accessory dwellingsLimited
Accessory dwelling unit development statewide under Maryland Land Use Article Title 4, Subtitle 5.
- The subtitle applies only to land with a single-family detached dwelling unit as the primary dwelling unit.
- Each legislative body must adopt a local law authorizing accessory dwelling unit development on or before October 1, 2026.
- A local law may establish accessory dwelling unit safety standards.
- A local law may prohibit full or partial conversion of an accessory structure when the only vehicular access is from an alley.
- Construction must meet public health, safety, and welfare standards, including relevant building codes and adequate public facilities provisions.
- A local law must exclude the accessory dwelling unit from density calculations and residential-growth limits applicable to the lot, parcel, or tract.
- A local law may not establish side- or rear-yard setback requirements exceeding existing accessory-structure setback requirements.
- Additional off-street parking requirements may be established only under the statutory considerations, with a waiver process and a completed parking study.
local authorization deadline: 2026-10-01 · primary dwelling type: single-family detached dwelling unit · side and rear setback ceiling: <= existing accessory structure setback requirements
“each legislative body shall adopt a local law authorizing the development of accessory dwelling units in accordance with this section.”
Maryland Land Use Article §4-502 ↗Re-checked Sep 11, 2026
Who permits septicMixed
Statewide onsite sewage disposal administration in Maryland.
- The Maryland Department of the Environment provides technical assistance and direction for delegated programs.
- County health departments and local approving authorities implement the delegated onsite sewage disposal programs.
- The actual permitting authority for a parcel is the applicable local approving authority.
- State regulations remain applicable statewide.
“The Onsite Systems Division provides technical assistance and direction to County Health Departments and Local Approving Authorities for the implementation of delegated programs for Onsite Sewage Disposal Systems (OSDS) and individual wells.”
On-Site Systems Division ↗Re-checked Sep 11, 2026
Septic permitRequired
Construction or alteration of an onsite sewage disposal system, and construction or alteration of structures served or to be served by such a system, statewide in Maryland.
- A person may not construct or attempt to construct an onsite sewage disposal system without first receiving a permit from the Approving Authority.
- Alteration, increased flow, or a change in wastewater character also requires permission.
- Before applicable construction or alteration, the Approving Authority must issue the required onsite sewage disposal permit, well construction permit, or certify existing systems, depending on whether the property uses private or public water and sewer.
- An onsite sewage disposal permit must be denied if a safe and adequate water supply is unavailable.
- The permit may not be issued if the system may pollute specified water supplies or waters.
- The construction permit is valid for no more than 2 years, subject to discretionary renewal and possible additional testing.
- The permit is in addition to subdivision approval and must conform to the approved county water and sewerage plan.
permit validity: <= 2 years maximum (May be renewed at the discretion of the Approving Authority; additional testing or evaluations may be required.)
“A person may not construct or attempt to construct an on-site sewage disposal system without first receiving a permit from the Approving Authority.”
COMAR 26.04.02.03 On-Site Sewage Disposal Permits ↗Re-checked Sep 11, 2026
Septic inspectionRequired
Any onsite sewage disposal system before it is covered or used statewide in Maryland.
- Inspection and approval must be by the Approving Authority or a third party approved by the Approving Authority.
- The Approving Authority may require installation, inspection, and approval before issuance of a building permit when hydrologic or geologic problems exist or construction could adversely impact the system.
- Property-transfer inspections have separate licensing requirements under COMAR 26.04.12.
“No part of an on-site sewage disposal system may be covered or used until it has been inspected and approved by the Approving Authority or a third party approved by the Approving Authority.”
COMAR 26.04.02.02 General Provisions ↗Re-checked Sep 11, 2026
Well permitRequired
Construction of regulated wells in Baltimore city, including potable and non-potable supply wells, geothermal wells, irrigation wells, geotechnical/environmental wells, and industrial wells.
- A State of Maryland licensed well driller must be used.
- The licensed well driller submits the application to the local County Approving Authority.
- Depending on the well type or quantity of water withdrawn, additional State permit requirements may apply.
- After the well is completed, the driller must submit a completion report to the Approving Authority.
- A potable-water well requires a Certificate of Potability before being placed into service, issued after laboratory tests show the water is safe for human consumption.
“To obtain a well construction permit, a licensed well driller submits an application to the local County Approving Authority.”
Well Construction ↗Re-checked Sep 24, 2026
One more reviewed finding on this topic
- Required — Construction of any well in Maryland, including wells serving private or non-community water supplies.
  “A well construction permit is required for any well that is constructed in the State of Maryland.”
  Well Construction Permit Applications and Forms ↗Re-checked Sep 11, 2026
county zoning authorityGeneral
Maryland counties adopting and enforcing zoning and planning laws, including for unincorporated county territory within the county's jurisdiction.
- The authority is exercised through local laws and remains subject to other public general law, public local law, and any applicable State-government regulatory authority.
- The statute states that the State policy is that planning and zoning controls are implemented by local government.
“A county may enact local laws relating to zoning and planning to protect and promote public safety, health, morals, and welfare, including: [...] It is the policy of the State that planning and zoning controls shall be implemented by local government.”
Maryland Code, Local Government Article ↗Re-checked Sep 21, 2026
county building authorityLimited
Maryland counties requiring building permits and adopting or enforcing building codes for residential construction in unincorporated areas.
- Local Government Article § 13-901 applies to all counties except Anne Arundel County, Baltimore City, Baltimore County, Cecil County, Charles County, Howard County, Prince George’s County, Queen Anne’s County, and Worcester County.
- Under § 13-901(c), covered county governing bodies may regulate building construction, adopt and enforce building codes, require building permits, impose permit and inspection fees, and inspect buildings and structures.
- Section 13-902 applies only to Calvert, Caroline, Dorchester, Frederick, Harford, Kent, and Worcester Counties.
- Under § 13-902(c), a building or housing code generally does not apply to a building on a farm or premises devoted solely to agricultural uses, except that it applies in Calvert County to dwellings on which construction began after July 1, 1979 and in Frederick County to residential buildings or buildings constructed for human habitation regardless of location or auxiliary use.
- Kent County must adopt a building code and housing code; Calvert, Caroline, Dorchester, Frederick, Harford, and Worcester Counties may adopt them.
- A building code adopted under § 13-902 must require a building permit before a building is built or improved and include standards for structural safety, fire prevention, lighting, ventilation, and proper access.
- Later amendments to codes incorporated by reference are not effective in Caroline, Frederick, Harford, Kent, and Worcester Counties until incorporated into the county code.
- Separate county-specific provisions apply to Cecil, Charles, Queen Anne’s, and St. Mary’s Counties, including the Charles County exemption for farm buildings and other outbuildings costing less than $2,500.
- The Maryland Building Performance Standards apply statewide to each building or structure for which a building permit application is received by a local jurisdiction on or after August 1, 1995.
building permit before building is built or improved: true (Required in a building code adopted under Local Government Article § 13-902.) · Charles County farm-building or outbuilding cost exemption: < 2500 USD (The Charles County building code does not apply to farm buildings or other outbuildings costing less than $2,500.) · Maryland Building Performance Standards application date: >= 1995-08-01 (Applies to building permit applications received on or after this date.)
“This section applies to all counties except: [...] The governing body of a county may: (1) regulate the construction of buildings and signs; (2) adopt a building code; (3) provide for enforcement of the code; (4) require permits for the construction of buildings and signs; (5) impose permit and inspection fees; (6) provide for inspection of buildings and structures;”
Maryland Code, Local Government Article, §§ 13-901 through 13-906 ↗Re-checked Sep 21, 2026

Inside cities and towns in Baltimore City

Municipal rules found while researching the county. They apply inside that city or town, not to unincorporated land.

Building permitRequired
Building work subject to § 105.1 of the Baltimore City Building Code.
- A permit is required before covered work begins.
- Section 105.2 contains listed permit exemptions; the code identifies interior painting, papering, tiling, carpeting, cabinets, countertops, similar interior finish work, and replacing roof shingles among listed exemptions.
- The source states that permits are required for work described in § 105.1; applicability of a particular exemption depends on the work type and other applicable laws.
“A permit issued by the Building Official is required before any person may do any of the following work:”
Section 105. Permits ↗Re-checked Sep 24, 2026
InspectionsRequired
Work performed under Baltimore City building permits, including required building inspections and final inspection.
- The City DHCD inspection guidance states that all permits require inspections.
- Required inspection stages vary by work type; the guidance lists footing, foundation, slab, framing, insulation, and final inspections for new buildings/additions, and framing, insulation, and final inspections for alterations.
- All electrical, mechanical, plumbing, and HVAC&R permits require rough-in and final inspections.
- For structures in a flood hazard area, an elevation certificate must be submitted before further vertical construction, and lowest-floor elevation documentation must be submitted before final inspection.
“The final inspection must be made after all work required by the building permit is completed.”
Inspection Guidelines and Other Permit Information ↗Re-checked Sep 24, 2026
Minimum dwelling sizeSpecified
Dwelling units regulated by the Baltimore City Building, Fire, and Related Codes
- A dwelling unit must contain at least 240 square feet of clear floor area.
- At least one room must contain at least 120 square feet of floor area.
- That room's least plane dimension must be at least 8 feet.
minimum clear floor area: >= 240 sq. ft. · minimum floor area of one room: >= 120 sq. ft. · least plane dimension of one room: >= 8 feet
“A dwelling unit must contain at least 240 sq. ft. (22.3 sq. m.) of clear floor area.”
Section 404. Occupancy Limitations ↗Re-checked Sep 24, 2026
Minimum lot sizeDistrict specific (with conditions)
Uses and dwelling types in Baltimore City's zoning districts
- Minimum lot area varies by zoning district and use.
- Table 8-401 specifies detached or semi-detached dwelling minimum lot areas from 2 acres in R-1A to 3,000 square feet in R-4.
- Table 9-401 specifies rowhouse minimum lot areas from 2,500 square feet in R-5 to 500 square feet in R-10 and multifamily minimums from 1,500 square feet per dwelling unit in R-5 to 200 square feet per dwelling unit in R-10.
- Other zoning tables and special districts may impose different standards.
detached or semi-detached dwelling minimum lot area: 2 acres to 3,000 sq. ft. (varies by R-1A through R-4 district) · rowhouse minimum lot area: 2,500 sq. ft. to 500 sq. ft. (varies by R-5 through R-10 district) · multifamily minimum lot area: 1,500 to 200 sq. ft. per dwelling unit (varies by R-5 through R-10 district)
“Dwelling: Detached or Semi-Detached | 2 acres | 1 acre | 21,780 sq.ft. | 14,520 sq.ft. | 9,000 sq.ft. | 7,300 sq.ft. | 5,000 sq.ft. | 5,000 sq.ft. | 3,000 sq.ft.”
Table 8-401 Detached and Semi-Detached Residential Districts – Bulk and Yard Regulations ↗Re-checked Sep 24, 2026
SetbacksDistrict specific (with conditions)
Minimum front, interior-side, corner-side, and rear yards in Baltimore City's zoning districts
- Required yards vary by district, use, lot type, and building type.
- Table 8-401 includes blockface-average rules when 50% or more of the lots on the blockface are developed.
- Table 9-401 includes courtyard reductions, alley-related rear-yard exceptions, and attached multifamily side-yard exceptions.
front, side, and rear yards: district-specific measurements feet (blockface average, courtyard, alley, and attached-building exceptions apply where stated)
“These minimums per district apply if less than 50% of the lots on the blockface have been developed.”
Table 8-401 Detached and Semi-Detached Residential Districts – Bulk and Yard Regulations ↗Re-checked Sep 24, 2026
Lot coverageDistrict specific (with conditions)
Maximum lot coverage in Baltimore City's zoning districts
- Maximum lot coverage varies by district and use.
- Table 8-401 ranges from 35% to 45% for all uses in detached and semi-detached residential districts.
- Table 9-401 ranges from 35% to 80% for detached/semi-detached, rowhouse, and multifamily dwellings, with up to 100% permitted for certain R-8 lots less than 80 feet deep when the rear property abuts an alley.
maximum lot coverage: 35% to 100% percent of lot area (100% exception applies under Table 9-401 footnote 4)
“For a lot with a depth of less than 80 feet, if the rear property abuts an alley, the maximum lot coverage is 100%.”
Table 8-401 Detached and Semi-Detached Residential Districts – Bulk and Yard Regulations ↗Re-checked Sep 24, 2026
Living in an RVProhibited
Use of a recreational vehicle for living, sleeping, or housekeeping purposes in Baltimore City; the cited section also covers private property zoned for residential use and recreational-vehicle storage.
- Residential-zoned private-property storage is allowed only in a fully enclosed structure or on a paved surface in the rear yard at least 3 feet from the side and rear lot lines.
- The storage subsection does not apply to recreational vehicles offered for sale in an approved outdoor sales and display area of a recreational vehicle dealership.
- All recreational vehicles must remain mobile, be maintained in good repair, and carry a current year's license and registration.
“No recreational vehicle may be used for living, sleeping, or housekeeping purposes.”
§ 16-802. Parking or storing of recreational vehicles. ↗Re-checked Sep 24, 2026
Camping on your landProhibited
Temporary camping or residential use in a recreational vehicle in Baltimore City.
- The cited rule prohibits living, sleeping, or housekeeping in a recreational vehicle; it does not establish a general ban on all tent camping.
- Tent use in residential districts is separately limited to no more than 5 consecutive days in the rear yard and is exempt from temporary-use permits.
“No recreational vehicle may be used for living, sleeping, or housekeeping purposes.”
§ 16-802. Parking or storing of recreational vehicles. ↗Re-checked Sep 24, 2026
Accessory dwellingsAllowed (with conditions)
Conversion of an existing accessory carriage house into a single-family detached dwelling in a Baltimore City Residential District or OR District.
- The accessory carriage house must have existed on June 5, 2017.
- The building must contain at least 350 square feet of gross floor area.
- All other Baltimore City Zoning Code requirements must be met.
- After conversion into a dwelling unit, the carriage house may not be enlarged by an alteration increasing building height or footprint by more than 20%.
minimum gross floor area: >= 350 square feet · maximum increase in building height or footprint after conversion: <= 20 percent
“accessory carriage house existing on June 5, 2017, in a Residential District or in an OR District may be converted into a single-family detached dwelling”
§ 15-504. Carriage house. ↗Re-checked Sep 24, 2026
Off-grid sanitationLimited
Off-grid sanitation for buildings with plumbing fixtures in Baltimore city.
- Public water and public sewer connections are required unless an NPDES permit provides otherwise.
- Private septic tank systems may only be installed with written permission of the Code Official.
- Private systems must comply with COMAR 26.04.02.
“Private septic tank systems may only be installed with the written permission of the Code Official.”
Section 317. Connection to Water and Sewer Systems ↗Re-checked Sep 24, 2026
Mandatory utility hookupWater and sewer (with conditions)
Buildings in Baltimore city in which plumbing fixtures are installed, and connections to Baltimore City's water and sanitary sewer systems.
- The building must connect to a public water supply and public sewer unless otherwise authorized by an NPDES permit under Title 9 of the State Environment Article.
- Sewer tapping or connection requires a permit from the Director of Public Works.
- Water, sanitary-sewer, or storm-sewer installation, renewal, modification, relocation, or abandonment requires a written agreement approved by DPW.
- Applications and applicable fees are required for water and sanitary-sewer connections.
- Connections require DPW review and approval, and the owner must obtain all necessary permits and approvals.
“The water distribution and sewer system of any building in which plumbing fixtures are installed must be connected to a public water supply system and to a public sewer system unless otherwise authorized by a National Pollutant Discharge Elimination System permit issued under Title 9 of the State Environment Article.”
Section 317. Connection to Water and Sewer Systems ↗Re-checked Sep 24, 2026

Still unanswered

We looked and could not find an official answer yet. Silence is not permission — ask the county directly.

Tiny homes — Occupancy of a tiny home in Baltimore City.

Each answer was extracted from an official source and independently re-checked against that source by a second reviewer. That is an evidence check, not legal advice. Rules change; confirm with the authority before you buy or build.

Living off-grid in Baltimore City, Maryland

Is Baltimore City a good place to live off-grid or homestead?

Baltimore City scores 22/100 on the Bolthole Index, a weak county profile. Its strengths: a durable current and mid-century hazard profile. Watch-outs: little seclusion — roughly 1,735,697 people within a 30-minute drive and strong self-sufficiency basics: 47″/yr rainfall with little drought.

Do you need a building permit in Baltimore City, Maryland?

Baltimore City generally requires a residential building permit, and it enforces county zoning. Onsite septic is permitted by Maryland Department of the Environment (Onsite Disposal Systems). Owner-builders may act as their own contractor to build their home. These answers are quoted from official sources and independently re-checked. Rules change and cities within the county differ — always confirm with the county before you buy or build.

How much does land cost in Baltimore City, Maryland?

Land in Baltimore City runs about $13,587 per acre, based on the latest county data.

What is the water situation in Baltimore City?

Baltimore City gets about 47" of rain a year, with severe drought in roughly 1.1% of years.

How remote is Baltimore City?

A representative private-land location has about 1,735,697 people within a 30-minute drive and 17,851,348 within two hours. The road-network catchments count population across county lines and clusters of smaller cities; straight-line radius values remain available as a comparison.

Building permits, zoning and land rules in Baltimore City, Maryland

At a glance

Who to call

Do you need a building permit in Baltimore City, Maryland?

Who is the Baltimore City building department, and how do you reach them?

Does Baltimore City have zoning, and what does that mean for a large lot?

How does septic and water work in Baltimore City?

Can you live in an RV or tiny home on your land in Baltimore City?

Building or buying in Baltimore City: the steps, in order

What to check before you buy land in Baltimore City

Watch-outs

Sources

Baltimore City in Maryland

How Baltimore City scores

Find land. Bring the promising ones back.

Parcel due diligence

Answers from the rulebook for Baltimore City

Baltimore City rules

Maryland rules that apply here

Inside cities and towns in Baltimore City

Still unanswered

Living off-grid in Baltimore City, Maryland

Is Baltimore City a good place to live off-grid or homestead?

Do you need a building permit in Baltimore City, Maryland?

How much does land cost in Baltimore City, Maryland?

What is the water situation in Baltimore City?

How remote is Baltimore City?

How Baltimore compares in Maryland