Do You Need A Permit For A Metal Building? (State Guide)

In most of the U.S., yes: if you're putting up a permanent metal building of any real size, you'll need a building permit. The exceptions are small sheds under a local size limit, some agricultural buildings, and a few rural areas with little or no code enforcement. Building without a permit where one is required can mean fines, a stop work order, trouble with insurance or a sale, and in the worst case an order to tear the building down.

This guide explains when permits apply, what they usually cost, why engineered drawings matter and how the rules differ from state to state.

When Do You Need A Permit?

Permit rules are set locally, by your city or county, usually based on a version of the International Building Code (IBC) or International Residential Code (IRC) with local changes. As a rule of thumb you'll need a permit if any of these apply:

• The building is larger than your local exemption for accessory structures. The model IRC exempts one story detached accessory buildings up to 200 square feet, and many places use that or a similar number.
• It will have electricity, plumbing, gas or HVAC.
• Anyone will live in it, or the public will use it.
• It's in a floodplain, a historic district or near a shoreline.
• It's a commercial or industrial building.

Even exempt buildings usually have to meet zoning rules for setbacks, height and lot coverage, and HOA rules can be stricter than the county.

Agricultural exemptions

Many states and counties exempt farm buildings used only for agriculture, such as barns, hay storage and equipment sheds, from some or all building permits. The details vary a lot. Exemptions often require that the land is used for farming, that nobody lives in the building, and that it isn't open to the public. A shop or a barndominium on farmland usually doesn't qualify.

What Does A Permit Cost?

Fees are set locally, so there's no national price. Many building departments charge based on the building's valuation, using a fee schedule or a cost per square foot, plus plan review fees. Separate permits may be needed for electrical, plumbing, mechanical, grading, septic and driveway work. Ask your building department for its current fee schedule, or use its online fee estimator if it has one.

Some costs that come with the permit process:

Engineered Drawings

A pre engineered metal building comes with a set of drawings designed for your loads: ground snow load, wind speed and exposure, seismic category and any collateral loads. For a permit, the drawings usually need to be stamped by an engineer licensed in your state. Most kit suppliers include them in the price. Make sure you get:

1. Building drawings with frame, purlin and girt sizes and connections
2. Anchor bolt plan showing bolt locations and column reactions
3. Foundation design, which many suppliers don't include; you may need a local engineer
4. Design loads listed clearly on the cover sheet

If the loads on the drawings don't match what your county requires, the plans will be rejected. Get the design values from your building department before you order. Our metal building foundation guide covers foundation design in more detail.

How Rules Differ By State

Every state adopts building codes differently. Some adopt a statewide code that all cities and counties follow. Others leave it to local governments, which means rules can change across a county line. A few examples of how this plays out:

Snow loads along Colorado's Front Range and in the mountains are set locally and can vary a lot over short distances, while in Oklahoma rules can differ sharply between cities and rural counties. See our guides to Colorado and Oklahoma metal building companies, and browse our locations pages for your area.

The Permit Process, Step By Step

1. Call the building department. Describe the building, its size and use, and ask what's required.
2. Check zoning. Confirm the building is allowed on your lot and note the setbacks.
3. Get the design loads. Snow, wind and seismic values for your address.
4. Order the building and drawings. Your supplier designs to those loads.
5. Submit your application. Include drawings, site plan and any other documents.
6. Respond to plan review comments. Reviewers may ask for changes or more detail.
7. Get the permit and post it on site.
8. Schedule inspections. Typically footings, slab or foundation, framing, and final. Homes add plumbing, electrical, mechanical and insulation checks.
9. Get a certificate of occupancy if the building will be lived in or used by the public.

Residential Versus Commercial Permits

A garage, shop or barn for your own use is usually reviewed under the residential code or as an accessory building, which tends to be simpler. A building used by the public or for business, such as a church, warehouse or retail space, falls under the commercial building code. Commercial projects usually need more: fire separation and exits, accessibility under the ADA, energy code compliance, parking and stormwater plans, and sometimes a fire sprinkler system. Plan review takes longer and fees are higher, so budget extra time. A barndominium is treated as a home, so it must meet the residential code for living spaces, including egress windows, smoke alarms, insulation and plumbing.

If you're not sure which category your building falls into, ask before you order. Changing the use later, for example turning a shop into a rental unit, may require a new permit and upgrades.

What Happens If You Build Without A Permit?

The consequences depend on where you are, but they can include fines, a stop work order, being required to apply for a permit after the fact with double fees, having to open up finished work for inspection, or being ordered to remove the building. Unpermitted buildings can also cause problems with insurance claims, refinancing and selling the property.

Tips To Make Permitting Easier

• Ask your supplier for drawings in the format your county wants.
• Order early. Plan review can take weeks in busy areas.
• Keep copies of all approvals and inspection reports.
• Build exactly to the stamped plans. Changes may need approval.
• Use local erectors who know the inspectors and the process.

Get Quotes

Ready to start? Get free quotes from suppliers who include stamped drawings for your state.

FAQ

Do I need a permit for a metal building on my property?

Usually, yes, unless it's small enough to fall under your local accessory building exemption or qualifies for an agricultural exemption. Check with your city or county.

How big can a building be without a permit?

It depends on your local code. The model IRC exempts one story detached accessory buildings up to 200 square feet, but many places use different limits.

Do metal carports need a permit?

Often, yes, especially larger or permanently anchored carports. Rules vary, so ask your building department. See our metal carports guide.

Do agricultural metal buildings need permits?

Many states exempt buildings used only for farming, but the rules vary and usually exclude shops, homes and buildings open to the public.

Sources

• International Residential Code, Section R105.2 permit exemptions, checked October 2026.

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