A new deck is one of the best ways to add outdoor living space in Frederick County. It is also one of the most common projects built without a required permit, which can cause trouble with inspections, insurance and resale. Here is what homeowners should know before building.
Key takeaways
- Most attached decks and raised decks in Frederick County need a building permit.
- Expect footing, framing and final inspections.
- Unpermitted decks often surface during home inspections when you sell.
- Compare deck materials and prices in our composite vs wood deck cost guide.
Most Decks Need a Permit
Frederick County enforces the International Residential Code (IRC). Under the IRC, the only decks typically exempt from a building permit are small, low, freestanding decks: generally under 200 square feet, no more than 30 inches above grade at any point, not attached to the house and not serving a required exit door. Almost every attached deck, and any deck more than 30 inches off the ground, requires a permit.
Homes inside the City of Frederick are permitted by the City, while other addresses go through Frederick County’s permitting office. Rules can change, so always confirm with the jurisdiction before you build.
What the County Asks For
- Construction drawings that are to scale, labeled and dimensioned, showing footings, framing, ledger attachment, guards and stairs.
- A plot plan showing the deck location and distances to property lines.
- Zoning review for setbacks, and HOA approval where your community requires it.
Frederick County offers expedited review for simple projects, including one level decks of 500 square feet or less, which can shorten the wait.
Inspections You Should Expect
- Footing inspection before concrete is poured, to check depth below the frost line and size.
- Framing inspection of the ledger connection, joists, beams, posts and hardware.
- Final inspection of guards, stairs, handrails and overall construction.
Why Skipping the Permit Is Risky
Ledger failures are the leading cause of deck collapses, and inspections exist to catch them. Unpermitted decks can also delay a home sale, trigger fines or require the deck to be opened up or rebuilt, and may complicate an insurance claim.
We draw the plans, pull the permit and schedule every inspection for the decks we build.
Let Us Handle the Permit
Samuel Construction Group designs and builds wood and composite decks and handles drawings, permits and inspections from start to finish. Learn more about our deck builder services in Frederick, MD and patio installation.
Want a real number for your project? Call (240) 875-4120 or request a free, written estimate. Samuel Construction Group is a licensed and insured general contractor in Frederick, MD (MHIC #134199).
Frequently asked questions
Do I need a permit to build a deck in Frederick County, MD?
Most decks that attach to the house, sit above a certain height or serve a door require a building permit in Frederick County. Freestanding, very low platforms may be exempt. Check with the county or let your contractor confirm.
What inspections are required for a deck?
Typically a footing inspection before concrete, a framing inspection before decking and a final inspection once railings and stairs are complete.
What happens if my deck was built without a permit?
It can delay a sale, affect insurance claims and may need to be opened up, inspected or rebuilt to code.
How much does a new deck cost in Maryland?
A 16 by 20 foot deck averaged about $18,400 in wood and $24,350 in composite in the South Atlantic region in 2025.