In Frederick County, Maryland, new construction, alterations, and accessory structures like decks need approval from the county’s Department of Permits and Inspections. A deck needs a permit even if you replace it at the same size. Painting, flooring, cabinets, and countertops don’t. New plumbing needs a plumbing permit. The City of Frederick and the Town of Mount Airy issue their own building permits, and the other towns require town zoning paperwork before the county permit.
Who issues the permit depends on your address
Frederick County’s Department of Permits and Inspections, in the Division of Planning and Permitting, issues building, electrical, and plumbing permits and zoning certificates. Inside the City of Frederick or the Town of Mount Airy, the city or town issues the building permit. In the county’s other incorporated towns, you get the town’s zoning paperwork first.
Frederick County Department of Permits and Inspections
Building, electrical, and plumbing permits and zoning certificates outside the City of Frederick and Mount Airy, through the Planning and Permitting online portal. Source: Frederick County: Building permits and zoning certificates, Frederick County: Residential building permit application (addition, alteration, accessory), Frederick County: Plumbing permits.
City of Frederick and Town of Mount Airy
Issue their own building permits for addresses inside their limits. Source: Frederick County: Building permits and zoning certificates, City of Frederick: Residential applications.
Other incorporated towns
A town zoning certificate or town paperwork is required before you apply to the county. Source: Frederick County: Building permits and zoning certificates, Frederick County: Residential building permit application (addition, alteration, accessory).
Do I need a permit? Job by job
Short answers for the remodel jobs homeowners ask us about most. Your exact scope decides the answer, so confirm with the permit office for your parcel.
Deck
Permit requiredRequired, even to replace a deck at the same size. Smaller one-level decks can qualify for the county’s expedited review. Source: Frederick County: Permits and inspections FAQ, Frederick County: Expedited permits.
Our decks workFinished basement
Permit requiredNeeds a building permit, with separate electrical and plumbing permits for that work. A basement finish without a kitchen can qualify for expedited review. Source: Frederick County: Expedited permits, Frederick County: Residential building permit application (addition, alteration, accessory).
Our basement finishing workBathroom or kitchen remodel
Depends on scopePainting, wallpaper, flooring, cabinets, and countertops don’t need a permit. New plumbing does, and so does replacing fixtures with something different or moving pipes. Alterations to the house need a building permit. Source: Frederick County: Permits and inspections FAQ, Frederick County: Building permits and zoning certificates.
Our bathroom remodeling workAddition, screened porch, or sunroom
Permit requiredRequired. Some smaller one-story additions and covered or screened porches with a truss roof can qualify for expedited review. Source: Frederick County: Building permits and zoning certificates, Frederick County: Expedited permits.
Our home additions workShed
Depends on scopeA small accessory structure under the county’s size limit doesn’t need a building permit, but may still need a zoning certificate. Larger ones need a building permit. Source: Frederick County: Permits and inspections FAQ, Frederick County: Residential building permit application (addition, alteration, accessory).
Fence
Often no building permitOutside the towns and the City of Frederick, county zoning doesn’t require a zoning certificate for a fence. Setback and height rules still apply, and towns can differ. Source: Frederick County: Permits and inspections FAQ.
Roof, siding, windows, and doors
Check with the countyWe couldn’t find an official Frederick County page that settles these jobs either way. Check with the Department of Permits and Inspections before you start. Source: Frederick County: Building permits and zoning certificates.
Our roofing workThe typical permit steps in Frederick County
- If you’re in an incorporated town, get the town’s zoning paperwork first. Source: Frederick County: Building permits and zoning certificates.
- Apply through the county’s Planning and Permitting portal with a plot plan and construction plans. Source: Frederick County: Residential building permit application (addition, alteration, accessory).
- Zoning and building plan reviewers, and other agencies as needed, review the application. Source: Frederick County: Residential building permit application (addition, alteration, accessory).
- Electrical and plumbing permits are separate applications by licensed trades or a qualifying resident owner. Source: Frederick County: Plumbing permits, Frederick County: Residential building permit application (addition, alteration, accessory).
- Request inspections in the portal; the permit closes with a Certificate of Completion. Source: Frederick County: Residential building permit application (addition, alteration, accessory).
HOA approval and historic districts are separate
If your home is in an HOA, get its approval as a separate step from the county permit and check your covenants before you apply. Source: Frederick County: Building permits and zoning certificates.
The City of Frederick runs its own historic district review for exterior work inside the city. Elsewhere, ask the county permit office whether your property is on the county historic register before you plan exterior changes. Source: City of Frederick: Historic district guide for contractors (PDF), Frederick County: Building permits and zoning certificates.
How Real Elite handles permits
On a job we build, we confirm which office has jurisdiction over your parcel, pull the permits the scope needs, and schedule the inspections. Start with a free site visit: we walk the project with you, tell you what we expect the permit path to be, and put it in a written estimate. If something on this page doesn’t match what the county tells you, the county is right.
Quick questions
- Do I need a permit to replace my deck in Frederick County?
- Yes. Frederick County requires a permit even to replace a deck at the same size.
- Do I need a permit for new kitchen cabinets in Frederick County?
- No. Cabinets, countertops, flooring, and painting don’t need a permit. New or moved plumbing does.
- I live in the City of Frederick. Does the county issue my permit?
- No. The City of Frederick issues its own building permits. The county handles addresses outside the city and Mount Airy.
Official sources
Last checked October 11, 2026. Rules change, so confirm with the county before you file.
- Frederick County: Building permits and zoning certificates
- Frederick County: Permits and inspections FAQ
- Frederick County: Residential building permit application (addition, alteration, accessory)
- Frederick County: Expedited permits
- Frederick County: Plumbing permits
- City of Frederick: Residential applications
- City of Frederick: Historic district guide for contractors (PDF)
Where we work in Frederick County
Related guides
Permit guides for other counties
- Fairfax County, VA permit guide
- Loudoun County, VA permit guide
- Arlington County, VA permit guide
- Montgomery County, MD permit guide
- Howard County, MD permit guide
- Berkeley County, WV permit guide
- Jefferson County, WV permit guide
- Washington County, MD permit guide
- Franklin County, PA permit guide
- Fauquier County, VA permit guide
- Prince William County, VA permit guide
- Frederick County and Winchester, VA permit guide
- Clarke County, VA permit guide
- City of Alexandria, VA permit guide
- Falls Church and City of Fairfax, VA permit guide
- Anne Arundel County and Annapolis, MD permit guide
- Carroll County, MD permit guide
- Manassas and Manassas Park, VA permit guide