permitsApr 3, 202610 min read

What Size Deck Can I Build Without a Permit? (2026 City-by-City Guide)

PermitDeck Team

Data-Driven Home Improvement Intelligence

The answer depends entirely on where you live. We researched 100 cities to find the exact size thresholds — and 7 cities where no deck is exempt.

What Size Deck Can You Build Without a Permit?

In most US cities, you can build a deck without a permit if it meets all four of these conditions simultaneously:

1. 200 square feet or less in total area

2. 30 inches or less above grade at every point

3. Not attached to your house (freestanding)

4. Does not serve a required exit door (like a back door)

Miss even one condition, and you need a permit. But here is the critical part: not every city follows these rules. After researching 100 US cities, we found significant variations.

The Standard IRC Exemption (Most Cities)

The International Residential Code (IRC) Section R105.2 establishes the baseline exemption that most cities adopt. Under this standard:

Exempt from permit:

Freestanding deck

200 sq ft or smaller

30 inches or less above grade

Does not serve an exit door

Always requires a permit:

Any deck attached to the house via a ledger board

Any deck over 30 inches above grade at any point

Any deck over 200 square feet

Any deck serving a required egress door

Any covered deck (with a roof structure)

What does 200 square feet look like?

A 10×20 deck = 200 sq ft (barely exempt)

A 12×16 deck = 192 sq ft (exempt)

A 14×14 deck = 196 sq ft (exempt)

A 16×16 deck = 256 sq ft (needs permit)

For context, a typical 2-person outdoor dining set needs about 64 sq ft. A grill station with a small seating area fits in about 100-120 sq ft. So a 200 sq ft freestanding deck is usable but modest.

Cities That Follow the Standard 200 sq ft / 30-Inch Rule

Most of the 100 cities we researched follow the IRC standard or something very close:

Houston, TX — 200 sq ft, 30 inches, not attached, not serving exit door

Austin, TX — 200 sq ft, 30 inches, not attached, not in flood area

Phoenix, AZ — Standard IRC exemption

Chicago, IL — 200 sq ft, 30 inches, freestanding

San Jose, CA — 200 sq ft, 30 inches per CBC

Tacoma, WA — 200 sq ft, 30 inches, not attached, single-family/duplex/townhouse only

Reno, NV — 200 sq ft, 30 inches, not attached, not serving exit

Colorado Springs, CO — 200 sq ft, 30 inches, detached, not serving main entry

Cities with Different Size Thresholds

Some cities modify the standard:

Philadelphia, PA — 160 sq ft EZ Permit

Philadelphia offers an EZ Deck Permit for decks 160 sq ft or less (216 sq ft with intermediate posts) on single-family rear yards. This isn't a full exemption — you still need the EZ permit — but it's a streamlined same-day process with no architectural plans required.

Washington, DC — 500 sq ft Simplified Permit

Washington, DC allows a simplified Deck Permit for decks 500 sq ft or less on single/two-family dwellings. No design professional required. Larger decks need a full permit with professional plans.

Denver, CO — Tiered by Height

Denver has a unique 3-tier system:

12 inches or less above ground: No permit needed

Over 12 inches: Zoning permit required

30 inches or more: Both zoning AND building permits required

Detroit, MI — 200 sq ft + Distance Rule

Detroit adds a distance requirement: the deck must be more than 36 inches away from the dwelling to qualify for exemption. Most cities only require it to be "not attached."

Cities Where NO Deck Is Exempt (Permit Always Required)

These cities eliminated the size exemption entirely. Every deck needs a permit regardless of size, height, or whether it's freestanding:

CityWhy? Virginia Beach, VAAll decks + all structural repairs need permits Norfolk, VABoth zoning AND building permit required for every deck Chesapeake, VANo size or height exemption exists St. Louis, MOAll decks and porches — no exceptions Cincinnati, OHNo published deck exemption Boston, MAAll new decks require a building permit Birmingham, ALAny residential work except painting requires a permit

If you live in one of these cities, the size question is moot. Get the permit.

California Cities: 30 Inches Is the Key Number

California cities follow the California Building Code (CBC), which generally exempts decks not more than 30 inches above grade. The 200 sq ft rule is less consistently applied in CA — the height threshold is what matters most:

Los Angeles, San Francisco, San Diego, Oakland, Long Beach, Fresno, Bakersfield: 30 inches above grade is the primary threshold

Even Exempt Decks Must Follow Building Code

This is the most misunderstood part of deck exemptions. An exemption from a permit does not mean an exemption from building codes.

Your exempt deck must still:

Use appropriate lumber and fasteners

Meet load requirements (40 PSF live load + 10 PSF dead load)

Have proper drainage away from the house foundation

Not encroach on utility easements

Comply with zoning setback requirements

Austin, TX explicitly states: "Even exempt decks must still comply with all Building Codes and City Codes."

If your exempt deck later fails to meet code and causes injury or property damage, you're still liable.

The Smart Approach

Even if your deck technically qualifies for an exemption, consider these factors:

1. Resale value: A permitted deck is a selling point. An unpermitted one is a red flag.

2. Insurance: Claims on unpermitted structures may be denied.

3. Cost: Most deck permits cost $50-$300 — trivial for a deck project.

4. Peace of mind: An inspection catches mistakes before they become safety hazards.

Many experienced deck builders recommend pulling a permit even for exempt decks, simply because the inspection process helps catch problems early.

Find Your City's Exact Rules

Don't guess — check. We've researched the exact exemption thresholds for 100 US cities with data sourced from official .gov websites. Find your city for the precise rules, or use our Do I Need a Permit? quiz for a quick answer.

Use our deck cost calculator to estimate your total project cost including permit fees.

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*Exemption rules verified from official city sources in April 2026. Requirements change — always confirm with your local building department before assuming your deck is exempt.*