Dorchester County, Maryland requires a building permit for all new residential and commercial construction, and the county administers zoning through Planning & Zoning12. The Dorchester County Health Department reviews septic plans and issues septic permits3. Incorporated municipalities may follow a different building-code arrangement, so confirm which jurisdiction controls the parcel before applying4.
At a glance
- Building permit
- Required for all new residential and commercial construction1
- Building code
- County-adopted residential and commercial codes apply, subject to municipal and farm-building exceptions4
- Zoning
- Administered by Dorchester County Planning & Zoning2
- Septic permits
- Required for installation or repair and issued by the Dorchester County Health Department35
- Private wells
- New and replacement well applications go to the Dorchester County Health Department before construction6
- Owner-builder
- A property owner has a limited state exception for owner-performed home improvements, not a blanket exemption from building permits7
- RV and tiny-home occupancy
- Ask Planning & Zoning for a parcel-specific determination before relying on either use28
- Conventional septic soils
- No mapped soils rate free of severe limits for a conventional drain field9
Who to call
Building permits
Dorchester County Planning & Zoning, Permits, Inspections & Licensing
County building permits and inspections, zoning, subdivision review, critical-area protection and floodplain management
501 Court Lane, Room 111, P.O. Box 107, Cambridge, Maryland 21613
Septic permits
Dorchester County Health Department Environmental Health Division
Environmental Health services for septic systems and private wells; the state geological survey verifies the county contact number for local well records
Contact details are copied from each office’s official page and were checked against it on September 27, 2026.
Do you need a building permit in Dorchester County, Maryland?
Yes. Dorchester County requires a building permit for all new residential and commercial construction, while the exact permits needed depend on the work1. The county's published examples include additions, demolition, structural interior alterations, reroofing, sheds, pools, signs, solar panels, and electrical, plumbing, mechanical, and fire-protection work10. County-regulated homes are built under the adopted International Residential Code, while other county-regulated buildings use the adopted International Building Code, each with county changes4. Maryland also requires local jurisdictions to inspect permitted work and issue the appropriate use and occupancy certificates1112. A true farm building can fall outside the county building-code scope, but that exception does not erase required electrical or plumbing permits or other applicable rules13.
Who issues building permits in Dorchester County, and how do you reach them?
Dorchester County Planning & Zoning, Permits, Inspections & Licensing is the county building office and also enforces zoning, subdivision, trade, property-maintenance, critical-area, forest-conservation, and floodplain rules8. Call the permit line at (410) 228-9636 or visit 501 Court Lane, Room 111, Cambridge, Maryland8. The county also links to an online portal for permits and license registration8. The county building code generally does not apply inside an incorporated municipality unless the municipality and County Council expressly authorize that arrangement, so a property inside municipal limits may start with the town or city instead4. For work in the county's jurisdiction, describe the complete project when you call because the county warns that its published examples are not an exhaustive list of required permits1.
Does Dorchester County have zoning?
Dorchester County administers zoning through Planning & Zoning, alongside subdivision regulations, Chesapeake Bay Critical Area protection, forest conservation, and floodplain management28. A generalized Maryland zoning map is useful for regional context but does not replace the county or municipal ordinance for a particular parcel14. Before choosing a house footprint, ask Planning & Zoning to confirm the parcel's jurisdiction, zoning district, allowed use, setbacks, lot coverage, height, and any Critical Area or floodplain overlay28. Dorchester County has not published a single confirmed countywide minimum home size, minimum lot size, setback, lot-coverage limit, or height limit in the material available here, so do not treat a listing's description as zoning approval2. Incorporated municipalities may have different arrangements, and the county building code itself expressly recognizes that municipal boundary distinction4.
How do septic permits work in Dorchester County?
The Dorchester County Health Department conducts land evaluations, reviews septic-system plans, and issues septic permits3. A construction permit is required to install a septic system or repair an existing one, and the state application process calls for the county land evaluation before the permit application5. Contact Environmental Health at 410-228-116715. Maryland requires the onsite system to be inspected and approved before any part is covered or used16. Dorchester County's soil data are a serious early-screening signal: none of the mapped soils rate free of severe limitations for a conventional drain field, so arrange the site evaluation before committing to a house location or assuming a conventional system will work93.
Can you live in an RV or tiny home on land in Dorchester County?
Dorchester County zoning applies, but a distinct county rule for living in an RV on private land was not confirmed, so ask Planning & Zoning for a written parcel-specific answer before buying or connecting utilities28. Tiny-home occupancy also needs a parcel-specific review because the available county material does not establish a separate tiny-home use or a single minimum dwelling size for the county's zoning jurisdiction28. A tiny home intended as a dwelling still faces the county's permit requirement for new residential construction and the adopted residential code where the county building code applies14. An owner performing home-improvement work has a limited Maryland exception related to contractor licensing, but that exception is not a general waiver of permits for a new house or all owner-built work7.
What are the steps to build a home in Dorchester County?
- Confirm whether the parcel is under county or municipal authority, then obtain its zoning district and overlay information from Planning & Zoning48.
- Arrange the county land evaluation and septic review early when public sewer is unavailable, because septic installation or repair requires a permit5.
- For a private well, have the licensed driller submit the well application and submit the homeowner's sanitary construction permit application before construction6.
- Complete the building and trade-permit applications through Dorchester County Planning & Zoning, using the county's online portal or permit office18.
- Schedule required inspections during the work and obtain the appropriate use and occupancy certificate before occupancy1112.
- If access meets a state road, coordinate a residential-access permit with the applicable state highway district office17.
What should you check before buying land in Dorchester County?
Start with jurisdiction and zoning: ask Dorchester County Planning & Zoning to confirm the district, permitted dwelling type, setbacks, parcel access, Critical Area status, and floodplain requirements28. Flood exposure can add inspections during construction, and elevated structures or manufactured homes in special flood hazard areas can need an elevation certificate before a certificate of occupancy1819. Test the septic site early because none of the county's mapped soils rate free of severe conventional-drain-field limitations9. Verify water service as well: new and replacement private wells require applications to the Dorchester County Health Department before construction6. For carrying costs, the county's effective property-tax rate is about 1%, and the median annual property-tax bill is about $2,3992021.
Watch-outs
- County building rules may not control inside an incorporated municipality, so establish the permitting jurisdiction before relying on county requirements4.
- No mapped Dorchester County soils rate free of severe limitations for a conventional septic drain field, making an early land evaluation especially important93.
- Development in a mapped floodplain can require local, state, and federal approvals in addition to the ordinary building process22.
- A farm-building code exception does not remove required electrical or plumbing permits or other applicable local and state rules13.
Sources
- Do you know Dorchester County’s Permit Regulations?, quoted and re-checked
- Dorchester County Planning & Zoning (2026 county census)
- Perc Tests and Septic Systems - Dorchester County Health Department, quoted and re-checked
- Dorchester County, MD Building Code, quoted and re-checked
- Maryland Septic System Construction Permit, quoted and re-checked
- Wells & Individual Water Supply - Dorchester County Health Department, quoted and re-checked
- Maryland Business Regulation Article § 8-504 (Maryland statewide rule), quoted and re-checked
- Dorchester County Planning & Zoning, Permits, Inspections & Licensing (dorchestermd.gov)
- Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
- Do you know Dorchester County’s Permit Regulations? (2026 county census)
- Maryland Public Safety Article § 12-505 (Maryland statewide rule), quoted and re-checked
- Maryland Public Safety Article § 12-505 (Maryland statewide rule), quoted and re-checked
- Dorchester County Codes and Building Code Amendments, quoted and re-checked
- Geospatial Applications and Modeling (GAM) (Maryland statewide rule), quoted and re-checked
- Dorchester County Health Department Environmental Health Division (mgs.md.gov)
- COMAR 26.04.02.02 General Provisions (Maryland statewide rule), quoted and re-checked
- Access Management/Permits - MDOT SHA (Maryland statewide rule), quoted and re-checked
- Bill No. 2015-1 Floodplain Management District, quoted and re-checked
- Bill No. 2015-1 Floodplain Management District, quoted and re-checked
- Effective property tax rate: Bolthole Index county data
- Median property tax bill: Bolthole Index county data
- Floodplain Permitting in Maryland (Maryland statewide rule), quoted and re-checked
Written September 27, 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.