Do You Need a Permit for a Deck in Denver?

Published October 21, 2026 · Denver CO Deck Builders · General information

Usually, yes. In Denver, most decks over 12 inches off the ground need a zoning permit; decks 30 inches or more above grade, decks over 200 sq ft, and all covered decks, porches and pergolas also need a building permit. Only a small, low, uncovered deck outside a historic district skips permits entirely. Rules change; confirm with Denver Community Planning and Development (CPD) before you build. This is general information, not legal advice.

Denver's deck permit thresholds at a glance

Denver CPD's residential deck page sets out three tiers, and the 2025 Denver Building Code adds the size limit. The code's building-permit exemption covers "uncovered decks including associated guards, stairs, and ramps that do not exceed 200 square feet" with walking surfaces "not more than 30 inches" above grade at any point.

Height is measured to the walking surface at its highest point above grade, so a deck that sits low by the back door but steps out over a slope can cross the 30-inch line at the far edge. CPD also notes that some decks may need a Sewer Use and Drainage Permit.

What Denver wants to see on deck plans

When a building permit is required, the plans need to show footing size and depth, the ledger connection, uplift connections, stairs, guards and handrails, and any cantilever, along with a site plan showing lot lines and distances. A few Denver code numbers drive those details:

• Frost line: 36 inches. Footings go below 36 in. of finished grade unless the deck is exempt (2025 Denver Building Code, Table R301.2).
• Ground snow load: 43 psf. Under 2024 IRC R507.1, decks must carry the greater of the live load or the ground snow load, which matters on a sunny day after a spring storm.
• Guards at least 36 inches above the walking surface where guards are required.

The ledger, the board that ties a deck to your house, is the connection inspectors look at hardest. Our guide to deck ledger attachment safety explains what a sound connection looks like.

How much does a deck permit cost in Denver?

There is no flat deck fee. Denver building permit fees are based on project valuation, and the separate zoning permit has its own small fee. National cost guides put typical deck permits at about $230–$500 (HomeAdvisor), but your number depends on the value of the work. One figure is worth remembering: fees double, with a $100 minimum, for work started without a permit. For full project budgets, see our Denver deck cost guide.

Historic districts and landmarks

If your home is an individual landmark or sits in a Denver historic district, even a low deck needs attention. Denver Landmark Preservation reviews exterior work that needs a building or zoning permit and issues a Certificate of Appropriateness. Its additions guidelines favor rear placement and designs that stay visually subordinate to the house. Build that review into your schedule before you sign a contract.

Can a homeowner pull their own deck permit in Denver?

Sometimes. Denver's homeowner permit is limited to owner-occupants of single-family homes (not ADUs, townhomes, condos or duplexes). You must show photo ID matching Assessor records, live in the home at least a year after the work, and either do the work yourself or hire Denver-licensed subcontractors. Otherwise, permitted work in Denver requires a licensed contractor; residential work is normally under a Class C license, and the contractor pulls the permit.

Deck permit rules in Denver's suburbs

Every suburb runs its own building department, and the thresholds are not the same. In most of the metro, an attached deck or any deck 30 inches or more above grade needs a permit; Denver adds a zoning permit above 12 inches, and Parker requires a permit for every deck.

• Lakewood: residential decks of 200 sq ft or less and 30 in. or less above grade are exempt. Guards are required over 30 in., decks west of Kipling are designed for 155 mph wind, and townhome or condo decks need an HOA letter (Lakewood deck handout).
• Littleton: since July 1, 2024, no permit for freestanding decks under 200 sq ft and under 30 in. that don't serve the main entrance (Littleton permit handout).
• Arvada: attached decks need a permit; some small detached decks may be exempt, so check with Arvada (Residential Exterior page).
• Parker: "Permits are required for all decks regardless of height or size" (Town of Parker).
• Highlands Ranch (Douglas County): the county wants an application, construction documents and a site plan, and recommends HOA/ACC approval first (Douglas County decks). The HRCA requires architectural approval for decks, with a $40 fee, drawings and a site plan (HRCA).
• Aurora, Centennial and Thornton: check with the city. See Aurora's Building Division, Centennial's deck submittal guide and Thornton's uncovered-deck guide.

HOA approval is a separate step from the permit. If you live in a covenant-controlled neighborhood, our post on HOA deck approval in Denver covers what to submit. Homes in mapped wildfire areas may also face new decking rules; see Colorado's wildfire code and your deck.

What happens if you skip the permit?

In Denver, fees double (minimum $100) once work has started without a permit, and an inspector may ask to see footings or framing that is already covered. Unpermitted decks can also come up when you sell, because buyers and their inspectors often ask for permit records. It is usually simpler to get the permit up front.

Before you hire a deck builder

1. In Denver, the contractor holds a current City and County of Denver contractor license (residential work is normally Class C) and will pull the permit; in Aurora, Lakewood, Littleton, Arvada, Thornton, Douglas County (Highlands Ranch) and other suburbs, the contractor is licensed or registered with that city or county.
2. Proof of liability and workers' compensation insurance.
3. A written contract with scope, materials and payment schedule.
4. HOA approval, and in Denver historic districts a Certificate of Appropriateness, before work starts.

Whether you want a wood deck, a composite or PVC deck or a covered deck (which always needs a building permit in Denver), the contractor you hire should explain which permits apply and include them in the quote.