What Size Shed Can You Build Without a Permit? City-by-City Guide 2026
Most cities allow sheds under 100 to 200 square feet without a building permit — but the exact threshold varies dramatically from city to city. Building a shed just 1 square foot over the limit without a permit can trigger fines and forced retroactive permitting. This guide covers size thresholds for 20 major U.S. cities so you know exactly where the line is.
City-by-City Size Thresholds
The following table shows the maximum shed size you can build without a building permit in 20 major cities. Anything above this size requires a permit application, fee payment, and inspections.
| City | Max Without Permit | Permit Fee | Details |
|---|---|---|---|
| Austin, TX | 200 sq ft | $50-$200 | View |
| Houston, TX | 200 sq ft | $50-$200 | View |
| Denver, CO | 200 sq ft | $50-$200 | View |
| Atlanta, GA | 200 sq ft | $50-$250 | View |
| Phoenix, AZ | 200 sq ft | $50-$200 | View |
| Miami, FL | 150 sq ft | $75-$250 | View |
| Tampa, FL | 150 sq ft | $75-$250 | View |
| Dallas, TX | 120 sq ft | $75-$250 | View |
| San Antonio, TX | 120 sq ft | $50-$200 | View |
| Indianapolis, IN | 120 sq ft | $50-$200 | View |
| Louisville, KY | 120 sq ft | $50-$200 | View |
| Nashville, TN | 120 sq ft | $50-$200 | View |
| Portland, OR | 120 sq ft | $75-$300 | View |
| New York, NY | 120 sq ft | $100-$500 | View |
| Chicago, IL | 100 sq ft | $75-$250 | View |
| San Francisco, CA | 100 sq ft | $100-$500 | View |
| Boston, MA | 100 sq ft | $75-$300 | View |
| Los Angeles, CA | 120 sq ft | $100-$400 | View |
| Seattle, WA | 120 sq ft | $75-$300 | View |
| Philadelphia, PA | 120 sq ft | $75-$250 | View |
Common Size Exemptions Explained
The size threshold is the square footage of the shed's footprint — the total area it covers on the ground. Here is how popular shed sizes map to the most common thresholds:
- 8x8 (64 sq ft): Below the threshold in all cities — no permit needed anywhere
- 8x10 (80 sq ft): Below threshold everywhere — no permit
- 10x10 (100 sq ft): Borderline in cities with 100 sq ft threshold (Chicago, SF, Boston) — check carefully
- 10x12 (120 sq ft): Needs permit in 100 sq ft cities, borderline in 120 sq ft cities
- 12x12 (144 sq ft): Needs permit in 100 and 120 sq ft cities, exempt in 150+ sq ft cities
- 12x16 (192 sq ft): Needs permit in most cities, exempt only in 200 sq ft cities
- 12x20 (240 sq ft): Requires a permit in every city
When Permits Are Required Regardless of Size
Even if your shed is under the size threshold, a permit may still be required if:
- Electrical work: Adding outlets, lighting, or a subpanel to the shed requires an electrical permit in virtually every city
- Plumbing: Running water or drainage to the shed triggers a plumbing permit
- Habitable space: If the shed will be used as a living space, office, or workshop with utilities, it may be classified as an accessory dwelling unit (ADU) requiring full permits
- Flood zone location: Properties in FEMA-designated flood zones often have additional permit requirements for all structures
- Historic districts: Properties in local or national historic districts may require design review and approval regardless of size
Rules That Apply Even Without a Permit
No permit does not mean no rules. Every shed — regardless of size — must comply with:
- Setback distances: Minimum distances from property lines (typically 3-5 feet from sides and rear). See our setback guide for city-specific distances.
- Height limits: Usually 10-15 feet for accessory structures
- Lot coverage limits: Maximum percentage of your lot covered by structures (the shed counts)
- Easements: Utility and drainage easements may prohibit structures in certain areas of your lot
- HOA covenants: Often stricter than city rules on size, materials, colors, and placement
How to Measure Your Shed Correctly
When determining whether your shed exceeds the permit threshold, measure the total footprint from exterior wall to exterior wall. In some jurisdictions, roof overhangs are included in the measurement, which can add several square feet to the official size. A shed with 10x12 interior dimensions but 2-foot overhangs on each side could have an official footprint much larger than 120 sq ft. When in doubt, call your city building department to ask exactly how they measure accessory structures.
The Cost of Getting It Wrong
A shed permit typically costs $50 to $300. Building without a required permit can cost: $200 to $2,000 in fines, a retroactive permit at 2x to 4x the normal cost, forced removal if the shed violates setbacks or codes, complications when selling your home, and insurance claim denials. The permit fee is a small investment compared to these risks.
Read our complete Shed Permit Rules guide →
Find your city's exact permit threshold on PermitRules →
Frequently Asked Questions
What is the most common shed size that does not require a permit?
The most common permit-free shed size across U.S. cities is under 120 square feet. However, thresholds range from 100 sq ft in cities like Chicago and San Francisco to 200 sq ft in cities like Austin and Denver. Always check your specific city rules, as the threshold varies significantly by municipality.
Can I build a 10x12 shed without a permit?
A 10x12 shed is 120 square feet. Whether it requires a permit depends on your city. In cities with a 100 sq ft threshold like Chicago, a 10x12 shed requires a permit. In cities with a 120 sq ft or higher threshold like Austin or Denver, it does not. Check your city on PermitRules.
Does a prefab or kit shed need a permit?
Yes, if the shed exceeds your city's size threshold, a permit is required regardless of whether it is a prefab kit, a store-bought shed, or a custom-built structure. The permit requirement is based on the finished size and placement, not the construction method.
Do I need a permit for a shed on skids or blocks?
In most cities, a shed on skids or concrete blocks (a non-permanent foundation) is treated the same as any other shed for permit purposes. The size threshold still applies. Some cities do exempt structures without permanent foundations from certain requirements, but this is not universal. Check your local rules.
What about sheds with electricity or plumbing?
Adding electricity or plumbing to a shed almost always requires an electrical or plumbing permit, even if the shed itself is below the building permit size threshold. These are separate permits from the building permit. Electrical work typically requires a licensed electrician and an electrical permit.
Can my HOA prevent me from building a shed even without a permit?
Yes. HOA rules are separate from city building permits and often impose stricter requirements. Your HOA may limit shed size, materials, colors, roof style, and placement. Some HOAs ban detached accessory structures entirely. Always check your HOA covenants in addition to city permit requirements.
What happens if I build a shed that is slightly over the threshold?
If your shed exceeds the permit threshold by any amount, a permit is required. There is no grace period or tolerance. A shed measuring 201 sq ft in a city with a 200 sq ft threshold requires a full building permit. Building without one can result in fines and required retroactive permitting at double the normal cost.
Do setback rules still apply for small sheds that do not need a permit?
Yes, absolutely. Setback requirements are part of zoning law, which is separate from building permit requirements. Even the smallest shed must comply with minimum distances from property lines. Violating setbacks can result in code enforcement action regardless of whether a building permit was required.