Can I Build a Shed Without a Permit? (It Depends on Your City, Not Your Opinion)

The 120-Square-Foot Myth

You have probably heard “you do not need a permit for a shed under 120 square feet.” This is true in many places — the International Building Code exempts accessory structures under 120 sq ft from building permits. But it is not true everywhere, and even where it is true, exemptions from a building permit do not exempt you from zoning rules.

You might not need a building permit, but you still need to comply with:

• Setback requirements (how close the shed can be to property lines, fences, and the house)
• Height limits (usually 8–12 feet at the peak for exempt sheds)
• Foundation requirements (some areas require a concrete pad or anchored foundation even for small sheds)
• Easements (utility easements where you cannot build anything, ever)
• HOA rules (which can be stricter than city rules and are enforced by fines)

Building a shed without checking all of these is how people end up with a city-issued removal order and a $500 fine.

How to Find Your Actual Rules

Step 1: Find Your Jurisdiction’s Building Code

Search “[your city or county name] building permit requirements shed” or go to your city’s website and look for the building or planning department. Most cities post their permit thresholds online.

Step 2: Check Both Building and Zoning

Building department tells you if you need a structural permit. Zoning department tells you where you can put it and how big it can be. These are often different departments with different rules.

Step 3: Check Your HOA

If you live in an HOA, their rules may be stricter than the city’s. The city might allow a 10x12 shed, but your HOA might cap it at 8x8 or prohibit sheds entirely. HOA rules are enforced by fines — the city will not save you.

Step 4: Call If It Is Unclear

Building department staff will answer questions over the phone. It is free and takes 5 minutes. Call and ask: “I want to build a [size] shed in my backyard. Do I need a permit? What setbacks apply?” Write down the name of the person you spoke with and the date.

Common Rules by Region (General Patterns)

These are typical rules, not universal. Always verify locally.

The Traps That Catch People

Trap 1: “I Do Not Need a Permit” ≠ “I Can Put It Anywhere”

Even if your 8x10 shed is exempt from a building permit, you still cannot put it:

• In a utility easement (underground power, gas, water, sewer lines)
• Closer to the property line than the setback allows
• In a flood zone without elevation
• Blocking a required fire access path

The city can still order you to move or remove the shed for zoning violations, even if no permit was required.

Trap 2: The “Gradual Expansion” Problem

You build an 8x8 shed (no permit needed). Two years later, you add a 4-foot lean-to extension. Now it is 8x12 — still under 120 sq ft, so still exempt, right? Maybe. Some jurisdictions count the total footprint of all accessory structures. Others count each structure separately. And some require a permit for any modification to an existing structure.

Trap 3: Electrical or Plumbing Triggers a Permit

You built the shed without a permit — fine. Now you want to run power to it for lights and outlets. Running electrical to any structure requires an electrical permit, even if the structure itself did not need a building permit. Same for plumbing if you want a sink.

This is where most people get caught: the shed itself was legal, but the electrical work was not, and an inspector spots it during a different project or a neighbor reports it.

Trap 4: Selling Your Home

Unpermitted structures can complicate a home sale. Buyers’ inspectors will note the shed. If it does not meet current setback or size requirements, the buyer may ask you to remove it or obtain a retroactive permit (which may require modifications or be denied). Some title companies flag unpermitted structures.

Trap 5: Property Tax Implications

In some jurisdictions, a permanent structure (even a small one) increases your assessed property value and your tax bill. A shed on a concrete slab is more likely to be assessed than one on skids or blocks. Check with your county assessor.

Size Guide: What Fits Without a Permit (In Most Places)

If You Do Need a Permit

The process is usually straightforward:

1. Submit a permit application — shed dimensions, location on a site plan, construction details
2. Pay the fee — typically $50–$200 for a small accessory structure
3. Wait for approval — 1–4 weeks depending on the jurisdiction
4. Build to the approved plan — inspections may be required for foundation and final
5. Final inspection — inspector confirms the shed matches the approved plan

The permit process adds time and cost, but it protects you from the removal orders, fines, and sale complications described above. For a shed you plan to keep for 10+ years, a $100 permit is cheap insurance.

The Bottom Line

• Under 120 sq ft: Often permit-exempt, but check your specific city/county and comply with setbacks
• Over 120 sq ft: Expect to need a permit in most jurisdictions
• Always check: Zoning rules, easements, HOA rules, and setback requirements — even when no permit is needed
• Never skip electrical permits: Running power to a shed always requires a permit
• Call your building department: 5 minutes on the phone saves weeks of headaches

The shed that “everyone builds without a permit” is the one that gets a removal notice when a neighbor complains or the property changes hands. Do it right the first time.