Baltimore County, MD Building Permits, Zoning & Septic Rules

Baltimore County, Maryland requires a building permit for a new home, and the county's own Department of Permits, Approvals and Inspections (PAI) issues it and enforces the county's building, electrical, plumbing and zoning codes¹. The County Council has sole authority over the official zoning map and reviews it comprehensively every four years²³. Septic systems go through the county's own Ground Water Management section, but as of July 1, 2023 the county stopped designing systems itself, so you'll need a licensed OSDS designer and installer⁴⁵.

At a glance

Building permit: Required; the Department of Permits, Approvals and Inspections (PAI) issues it and enforces building, electrical, plumbing and zoning codes¹
Zoning: Yes, countywide, on a map the County Council controls and reviews every four years²⁶
Septic: Permitted by the county's Ground Water Management section; since July 1, 2023 the county provides only minimum design criteria, not full designs⁴⁵
RV living: Not allowed. A recreational vehicle may be stored on a residential lot but may not be lived in or otherwise occupied while stored there⁷
Wells: A permit from the county Approving Authority is required before drilling any well⁸
Owner-builder: Maryland's statewide home-improvement exemption covers work you do yourself on your own home, but it does not create a general exemption for new-home construction⁹
Septic soils: About 17.7% of soils avoid severe limits for a conventional drain field¹⁰
Property tax: Effective rate about 1.1%, median bill near $3,645/year¹¹¹²

Who to call

Building permits

Baltimore County Department of Permits, Approvals and Inspections (PAI)

Building, electrical, plumbing and zoning permits and code enforcement, and oversight of land development and use, for Baltimore County

410-887-3353

111 West Chesapeake Avenue, Towson, MD 21204

Online permits →

Septic permits

Baltimore County Ground Water Management Section

Drinking water well permits, onsite sewage disposal (septic) system permits, and removal of residential underground storage tanks for Baltimore County

410-887-2762

[email protected]

111 West Chesapeake Avenue, Room 305, Towson, MD 21204

Contact details are copied from each office’s official page and were checked against it on September 24, 2026.

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

Yes. The Department of Permits, Approvals and Inspections (PAI) issues building permits and enforces the county's building, electrical, plumbing and zoning codes across all 600-plus square miles of the county¹¹³. Once a permit is issued, the code official inspects the work from time to time during construction and again on completion, not just at the end¹⁴. Maryland's statewide law lets a property owner do home-improvement work on their own home without the usual contractor-licensing requirement, but that exemption covers home improvement, not a general pass on permits for building a new house from scratch, so check with PAI before assuming it applies to your project⁹.

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

The Department of Permits, Approvals and Inspections (PAI) is at 111 West Chesapeake Avenue, Towson, MD 21204, phone 410-887-3353¹³. PAI is the one-stop office for building, electrical, plumbing and zoning permits, so it's the right first call whether your question is about a permit, an inspection, or whether your lot's zoning allows what you want to build¹³².

Does Baltimore County have zoning?

Yes, countywide. Properties are governed by the county's official zoning map, and the Baltimore County Council has sole legislative authority to set or change any property's zoning classification²³. The Council reviews that map comprehensively every four years and separately considers individual property reclassification requests in between². Zoning is also where the county's recreational-vehicle rules live: one RV may be stored on a residential lot under specific setback rules, but it can't be lived in while stored there, and as of Bill 20-25 an RV can't be parked on a public road in a residential zone for more than a 24-hour loading window, with a $250-per-day fine for violations⁷.

How do septic permits work in Baltimore County?

Septic systems are permitted through the county's own Ground Water Management (GWM) section, which also handles well permits and underground storage tank removal⁵⁴. Maryland law statewide requires a permit before anyone constructs or attempts to construct an onsite sewage disposal system, and the system can't be covered or used until it's inspected and approved¹⁵¹⁶. A significant change took effect July 1, 2023: the county stopped providing its own OSDS designs and now provides only minimum design criteria, so any new or repaired system needs a design from a licensed OSDS designer and installation by a licensed OSDS installer, plus a site plan⁵. Soils are a real factor to plan around too: only about 17.7% of the county's land avoids severe limitations for a conventional drain field¹⁰.

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

Not in an RV — the county's zoning rules say so directly. A recreational vehicle may be stored on a residential lot, but it "may not be lived in, or otherwise occupied, when stored on a lot," and it must stay licensed and mechanically ready to move⁷. Whether a tiny home can be occupied as a standalone residence wasn't confirmed in official Baltimore County materials reviewed for this guide, and no specific rule turned up despite a direct search; ask PAI before buying land with that plan¹³.

Building a home in Baltimore County: the steps, in order

Check your parcel's zoning classification on the county's official zoning map before you design anything, since the County Council controls it and it's only comprehensively revisited every four years².
If you'll need a well or septic system, start with Ground Water Management: apply for your well permit and, for septic, line up a licensed OSDS designer and installer since the county no longer designs systems itself⁵.
Apply for your building permit through the Department of Permits, Approvals and Inspections, which also covers electrical and plumbing permits¹³.
Expect PAI to inspect the work from time to time during construction and again at completion, not only at the final walkthrough¹⁴.
If any part of your parcel is in a mapped floodplain, budget for the county's floodplain-development standards, which the county set at a higher protection level than the state's model ordinance under Bill 6-24¹⁷.

What to check before you buy land in Baltimore County

Septic and soils: with only about 17.7% of the county's soils free of severe limits for a conventional drain field, get a site evaluation with Ground Water Management before you count on a simple system¹⁰⁵. Wells: any private water-supply well needs its own permit from the county before drilling starts⁸. Flood risk: Baltimore County holds tidal and nontidal floodplain development to a higher standard than the state model ordinance, and elevated structures need an elevation certificate before a certificate of occupancy is issued¹⁷¹⁸. RVs and short-term rentals: you can't live in a stored RV on a residential lot, and renting out a home short-term through a hosting platform requires a county license first⁷¹⁹. Taxes: the effective property tax rate here runs about 1.1%, with a median annual bill near $3,645¹¹¹².

Watch-outs

You cannot live in an RV stored on a residential lot in Baltimore County, even short-term; the county's zoning rules only allow storage, not occupancy, and enforcement extends to a per-day fine for related public-road parking violations⁷.
Since July 1, 2023, Baltimore County no longer designs septic (OSDS) systems itself; budget for a licensed OSDS designer and installer rather than expecting the county to hand you a design⁵.
Whether a tiny home can be occupied as a standalone residence, and the county's specific numbers for minimum lot size, setbacks, lot coverage and building height, were not confirmed in the official Baltimore County materials reviewed for this guide; check these directly with PAI before you rely on them¹³.

Sources

Written September 24, 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 County scores

Seclusion11100% ev.

Self-Sufficiency71100% ev.

Admin Boringness42100% ev.

Durability85100% ev.

Property Autonomy43100% ev.

Carry Cost44100% ev.

Evidence strength: 100%. This reports direct-source completeness and fallback use; it is separate from the score and is not a confidence interval. How it works →

$368kTypical home

1.1%Property tax

$13,587Land / acre

47.5"Annual rain

0.8% of yrsSevere drought

4.9 / yr (+4.6)Mid-century 100°F days

12.5 daysMid-century dry spell

2.31" (+8.2%)Mid-century 1-day rain

1.47×Wildfire change factor

100%Forward climate coverage

$1,752Home insurance / yr

2.1% / yrInsurance growth

0.8%Nonrenewal rate

county median (2+ published ZIPs)Insurance basis

1,015,807People within 30 min

16,727,485People within 2 hr

1,074,512Radius comparison (15 mi)

1,411.7People / sq mi

2.2%Federal land

79.8%Land at 15% slope or less

17.7%Septic soil without severe limits

56,715 acWorkable land screen

92.3 tonsBiomass / forest ac

54.8°FAvg temp

Answers from the rulebook for Baltimore County

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

Baltimore County rules

InspectionsLimited
Development permitted in Baltimore County special flood hazard areas.
- The floodplain administrator conducts periodic inspections at appropriate times throughout construction to monitor compliance.
- Inspections may include stake-out, foundation, enclosure, utility, and final inspections.
- The final inspection occurs before issuance of the certificate of occupancy.
- For elevated structures and manufactured homes, an elevation certificate must be submitted before final inspection and certificate issuance.
“THE FLOODPLAIN ADMINISTRATOR SHALL MAKE PERIODIC INSPECTIONS OF DEVELOPMENT PERMITTED IN SPECIAL FLOOD HAZARD AREAS, AT APPROPRIATE TIMES THROUGHOUT THE PERIOD OF CONSTRUCTION IN ORDER TO MONITOR COMPLIANCE.”
2025 - Baltimore County - 06-24 ↗Re-checked Sep 24, 2026
Certificate of occupancyLimited
Elevated structures and manufactured homes in Baltimore County special flood hazard areas, including new structures, substantially improved structures, and additions.
- A final inspection is required before issuance of the certificate of occupancy.
- The permittee must submit an elevation certificate before final inspection and issuance of the certificate of occupancy.
- The rule applies to elevated structures and manufactured homes, including new structures and manufactured homes, substantially improved structures and manufactured homes, and additions to structures and manufactured homes.
“THE PERMITTEE SHALL HAVE AN ELEVATION CERTIFICATE PREPARED AND SUBMITTED PRIOR TO FINAL INSPECTION AND ISSUANCE OF A CERTIFICATE OF OCCUPANCY FOR ELEVATED STRUCTURES AND MANUFACTURED HOMES”
2025 - Baltimore County - 06-24 ↗Re-checked Sep 24, 2026
County-wide zoningPresent (with conditions)
Properties governed by Baltimore County's official zoning map and zoning classifications.
- The official zoning map is adopted by the Baltimore County Council.
- The County reviews the map comprehensively every four years and considers requests to change individual property classifications.
- The County Council has sole legislative authority to determine a property's zoning classification.
“The County’s official zoning map is adopted by the Baltimore County Council.”
CZMP – Baltimore County Council ↗Re-checked Sep 24, 2026
Local zoningPresent (with conditions)
Local land-use zoning administered through Baltimore County's official zoning map and County Council zoning classifications.
- The source identifies Baltimore County as the zoning authority for the official county zoning map.
- Zoning classification is property-specific and determined legislatively by the County Council.
- This claim does not establish rules administered by any separate municipality or subordinate authority.
“The County Council has the sole legislative authority to determine the zoning classification of a property.”
CZMP – Baltimore County Council ↗Re-checked Sep 24, 2026
Living in an RVProhibited
Living in or otherwise occupying a recreational vehicle when stored on a residential lot in Baltimore County; the cited rule also addresses RV storage and public-road parking in residential zones.
- One recreational vehicle may be stored on a residential lot subject to the cited zoning requirements.
- Except for a truck camper, the vehicle must have a current license.
- The vehicle must be mechanically ready to be moved at any time.
- A recreational vehicle may not be lived in or otherwise occupied when stored on a lot.
- On a lot occupied by a single-family detached or semi-detached dwelling, one vehicle may be stored 2.5 feet from any rear or side lot line; in a side yard it must be at least eight feet to the rear of a lateral projection of the front foundation line.
- For an individually owned row or group house, the vehicle must be entirely in the rear yard and 2.5 feet from side or rear lot lines.
- Multifamily rental or condominium storage areas must be specially designed and screened from adjacent off-site residential uses.
- Under Bill 20-25, a recreational vehicle may not be parked or stood on a public road, street, or way within a residential zone, except for a 24-hour loading or unloading period; violation is a misdemeanor and carries a $250-per-day fine.
- The Act takes effect 14 days after enactment.
residential-lot side/rear setback: 2.5 feet (Single-family detached or semi-detached dwelling lots; row/group houses must be entirely in the rear yard.) · side-yard setback from front foundation projection: >= 8 feet (Single-family detached or semi-detached dwelling lots.) · public-road loading/unloading period: 24 hours (Residential zones and the MD 43 Overlay District.) · public-road violation fine: 250 USD per day
“Contrary provisions of these regulations notwithstanding, one recreational vehicle may be stored on a residential lot as set forth below. Such vehicle, except a truck camper, shall have a current license, may not be lived in, or otherwise occupied, when stored on a lot and shall be mechanically ready to be moved at any time.”
Bill 20-25 — Parking of Recreational Vehicles on Public Roads ↗Re-checked Sep 24, 2026
Building in a floodplainLimited
Development in Baltimore County tidal and nontidal floodplain areas.
- Baltimore County regulates floodplains through County Code provisions conforming to the Maryland Model Floodplain Ordinance.
- The rules are intended to comply with the National Flood Insurance Program.
- The county maintains a higher floodplain-protection standard for tidal and nontidal waters.
“Bill 6-24 brought Baltimore County into alignment with the model ordinance, while maintaining the higher standard of floodplain protection that has been a hallmark of program implementation in this County for both tidal waters and nontidal waters of the State.”
September 15, 2025 County Council Notes Package ↗Re-checked Sep 24, 2026
Short-term rentalsLimited
Residential dwelling units rented through a hosting platform for no more than 30 consecutive days in Baltimore County.
- A host must obtain a county short-term-rental license before advertising, accepting bookings, or renting.
- The application fee and renewal fee may not be less than $300.
- The license expires on the third anniversary of its effective date and may be renewed for an additional three-year term.
- A license may not be issued to a dwelling with a long-term rental license or to an accessory dwelling unit.
- Guest limits depend on bedrooms, parking, and septic capacity; maximums are 8 guests for a single-family detached dwelling and 6 guests for a single-family attached or semi-detached dwelling.
- The rental may not be advertised as private or public event space.
- At least one guest must be at least 21 years old; the host must maintain at least $1,000,000 liability insurance and be available or onsite within 60 minutes.
- Hosts must retain electronic guest records for 3 years.
- Hosts operating before the Act's effective date have 180 days to comply.
application fee minimum: >= 300 USD · renewal fee minimum: >= 300 USD · license term: 3 years (renewable for an additional three-year term) · maximum guests, single-family detached: <= 8 guests (subject also to bedroom, parking, and septic-capacity limits) · maximum guests, single-family attached or semi-detached: <= 6 guests (subject also to bedroom, parking, and septic-capacity limits) · maximum rental period per same guest: <= 30 consecutive days
“A HOST MAY NOT ADVERTISE A SHORT-TERM RENTAL ON A HOSTING PLATFORM, ACCEPT A BOOKING TRANSACTION, OR RENT A SHORT-TERM RENTAL TO A GUEST UNLESS THE HOST HAS BEEN ISSUED A LICENSE FOR THE SHORT-TERM RENTAL IN ACCORDANCE WITH THIS SUBTITLE.”
Rental Housing Licenses – Short-Term Rental License, Bill 68-24 ↗Re-checked Sep 24, 2026
Permit processPublished (with conditions)
Building permit submission, review, inspection, and approval process in Baltimore County.
- Construction documents generally must be prepared by a registered architect or engineer and bear the original signature and seal.
- The building official may waive sealed-document submission in whole or in part when the work scope does not require that review.
- A revised site plan is required when a lot is changed from the official plat site plan.
- Signed and sealed plans and data sheets are required with a change-of-occupancy permit request unless otherwise allowed by applicable code.
- Inspections occur during and upon completion of permitted work.
- Other regulatory approvals may be required.
“AFTER ISSUING A BUILDING PERMIT, THE CODE OFFICIAL SHALL CONDUCT INSPECTIONS FROM TIME TO TIME DURING AND UPON COMPLETION OF THE WORK FOR WHICH A PERMIT HAS BEEN ISSUED.”
Baltimore County Building Code legislation, Bill 49-24 ↗Re-checked Sep 24, 2026
Building permitRequired
The Baltimore County Department of Permits, Approvals and Inspections issues all building permits and enforces the county's building, electrical, plumbing and zoning codes.
Baltimore County Permits, Approvals and Inspections ↗Scouted from the county site, not yet independently re-checked

Maryland rules that apply here

Owner-builder exemptionConditional
Home-improvement permits for work performed by a property owner in a Maryland county or municipal corporation.
- The exception applies to a permit for a home improvement performed by a property owner.
- It does not establish a general exemption from building permits for new-home construction or all construction work.
- For home improvements not performed by the property owner, the permit must include the license number of a licensed contractor.
- The statute applies to building and permits departments of counties and municipal corporations.
“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
Zoning districtsPartial
Statewide generalized zoning information published by the Maryland Department of Planning for planning and regional analysis; it is not a substitute for the applicable county or municipal zoning ordinance.
- Each local jurisdiction is responsible for its own zoning, except certain municipalities that do not exercise planning and zoning authority.
- Maryland has hundreds of unique local zoning categories.
- MDP groups generalized zoning into Rural, Residential, and Other, further divided into 11 generalized zoning categories.
- The generalized categories do not establish the complete regulatory zoning districts or permitted uses for a specific parcel.
“To aid regional and state-level planning purposes, MDP classified zoning districts under three main groups—Rural, Residential, and Other—which are further broken down into 11 distinct Generalized Zoning Categories.”
Geospatial Applications and Modeling (GAM) ↗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
One more reviewed finding on this topic
- Mixed — Regulation of individual wells and septic systems in Maryland, including Baltimore County
  “Regulation of individual well and septic systems in conjunction with local health departments.”
  Wastewater Permits Program ↗Re-checked Sep 24, 2026
Septic permitRequired
Construction or alteration of on-site sewage disposal systems in Baltimore County under Maryland regulations
- An application must be submitted in the form required by the Approving Authority and include the required site plan, soil evaluations, percolation and other test locations, proposed design, improvements, treatment methods, and well information.
- Construction or alteration may not proceed without the permit.
- For facilities using an on-site sewage disposal system and private water supply, both an on-site sewage disposal permit and well construction permit are required before construction or alteration.
- For facilities using an on-site sewage disposal system and public water supply, an on-site sewage disposal permit is required before construction or alteration.
- The permit may be denied if a safe and adequate water supply is unavailable or if the system may pollute protected waters.
- The permit is valid for no more than 2 years from issuance, subject to discretionary renewal and possible additional testing.
- The project 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.”
.03 On-Site Sewage Disposal Permits ↗Re-checked Sep 24, 2026
One more reviewed finding on this topic
- Required — 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 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
One more reviewed finding on this topic
- Required — On-site sewage disposal system installation and use in Baltimore County
  “may be covered or used until it has been inspected and approved”
  .02 General Provisions ↗Re-checked Sep 24, 2026
Off-grid sanitationLimited
Portable units, privies, and other special sewage-collection methods used for sanitation in Baltimore County
- Except as authorized by the Maryland Department of Health, portable units may not facilitate occupation or use of a new building, a modified or expanded existing building, or a change in use.
- A portable unit may not be used for longer than 3 days within a 60-day period without authorization from the Approving Authority.
- The Approving Authority may require a permit for a portable unit or privy and may inspect it and require corrective action.
- Privy location and construction plans must be approved by the Approving Authority before issuance of a sewage-disposal construction permit.
- Privies must prevent soil contact with fecal matter, fly access, contamination of ground or surface water, insect and rodent access, and odor nuisances.
portable-unit duration: <= 3 days (Within any 60-day period without authorization from the Approving Authority.)
“A person may not utilize, operate, or make available a portable unit for longer than 3 days within a 60-day period”
.08 Special Methods of Sewage Collection and Disposal ↗Re-checked Sep 24, 2026
Well permitRequired
Construction of wells in Baltimore County, including private water-supply wells
- An application must be made on forms provided by the Approving Authority and submitted for review.
- A well may not be constructed until the Approving Authority issues a permit to drill, except under the emergency procedure in Regulation .06.
- The permit may be issued only to a person licensed by the State Board of Well Drillers as a master well driller.
- A separate permit is required for each well, although a cluster may be permitted under one permit.
- The permit is valid for 12 months and may be extended in 6-month increments upon written request by the well driller.
- Reworking or repairing an existing well without deepening does not require a well construction permit; deepening may also be exempt in specified circumstances under Regulation .11.
permit validity: 12 months (May be extended in 6-month increments upon written request by the well driller.)
“A well may not be constructed until the Approving Authority has issued a permit to drill the well”
Chapter 04 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
Mandatory utility hookupConditional
Properties in Baltimore County served or potentially served by community sewerage systems
- A person may not construct or install an on-site sewage disposal system for property already connected to a community sewerage system, except as authorized by the Department.
- If a community sewerage system is adequate and economically available to the building, the Approving Authority may require connection to that system.
- An on-site sewage disposal permit may not be issued unless the project conforms to the approved county water and sewerage plan.
“the Approving Authority may require a connection to the community sewerage system.”
.02 General Provisions ↗Re-checked Sep 24, 2026
Driveway accessLimited
Construction or modification of residential driveways within Maryland State right-of-way under MDOT State Highway Administration jurisdiction.
- The requirement applies within the State right-of-way.
- The applicant must coordinate with the applicable MDOT SHA district office for obtaining a permit.
- Local planning and zoning or development review may also apply.
- The source does not establish a statewide permit requirement for driveways outside State right-of-way.
“You need a permit for the following activities within the State right of way. For a Commercial/Industrial/Residential Access Permit, see above. Construction or modification of residential driveways”
Access Management/Permits - MDOT SHA ↗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

Still unanswered

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

Minimum dwelling size — Minimum dwelling size requirements in unincorporated Baltimore County.
Minimum lot size — Minimum lot size requirements under Baltimore County zoning regulations.
Setbacks — Building setbacks in unincorporated Baltimore County.
Lot coverage — Lot coverage requirements in unincorporated Baltimore County.
Building height — Building height requirements in unincorporated Baltimore County.

4 more unanswered

Camping on your land
Tiny homes
Agricultural exemption
Subdividing land

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 County, Maryland

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

Baltimore County scores 38/100 on the Bolthole Index, a marginal county profile. Its strengths: a durable current and mid-century hazard profile and strong self-sufficiency basics: 47.5″/yr rainfall with little drought. Watch-outs: little seclusion — roughly 1,015,807 people within a 30-minute drive.

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

Baltimore County generally requires a residential building permit, and it enforces county zoning. Onsite septic is permitted by Baltimore County Ground Water Management (Dept. of Environmental Protection and Sustainability). 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.

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

Living in an RV on your own land in Baltimore County is prohibited: Living in or otherwise occupying a recreational vehicle when stored on a residential lot in Baltimore County; the cited rule also addresses RV storage and public-road parking in residential zones. One recreational vehicle may be stored on a residential lot subject to the cited zoning requirements. Except for a truck camper, the vehicle must have a current license. Confirm with the county before relying on it.

How much does land cost in Baltimore County, Maryland?

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

What is the water situation in Baltimore County?

Baltimore County gets about 47.5" of rain a year, with severe drought in roughly 0.8% of years.

How remote is Baltimore County?

A representative private-land location has about 1,015,807 people within a 30-minute drive and 16,727,485 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 septic rules in Baltimore County, Maryland

At a glance

Who to call

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

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

Does Baltimore County have zoning?

How do septic permits work in Baltimore County?

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

Building a home in Baltimore County: the steps, in order

What to check before you buy land in Baltimore County

Watch-outs

Sources

Baltimore County in Maryland

How Baltimore County scores

Find land. Bring the promising ones back.

Parcel due diligence

Answers from the rulebook for Baltimore County

Baltimore County rules

Maryland rules that apply here

Still unanswered

Living off-grid in Baltimore County, Maryland

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

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

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

How much does land cost in Baltimore County, Maryland?

What is the water situation in Baltimore County?

How remote is Baltimore County?

How Baltimore compares in Maryland