Steel Building Agricultural Exemption and Who Qualifies

You bought a few acres, you want a 40x60 steel barn for hay and equipment, and someone at the feed store told you farm buildings do not need a permit. Sometimes that is true. Often it is only half true, and the half that is wrong shows up when an inspector, a lender, or an insurance adjuster asks for paperwork you never filed. This guide covers how an agricultural exemption for a steel building actually works, who tends to qualify, and what still applies even when you do.

I review permit files for a living, and the agricultural exemption is the single most misunderstood line in most county codes. It is real, it can save you a few thousand dollars and several weeks, and it comes with strings.

What an agricultural exemption actually exempts

Most states adopt a version of the International Building Code, and many of them carve out buildings used for agriculture. Pennsylvania's Uniform Construction Code, for example, excludes qualifying agricultural buildings from its permit requirements. Other states leave the decision to each county, which is why two neighbors on either side of a county line can get completely different answers.

When the exemption applies, it usually removes the building permit and the structural plan review. That means no stamped drawings submitted to the county, no framing inspection, and no certificate of occupancy. On a typical 40x60 farm building, the permit fee alone might run $400 to $1,500 depending on the jurisdiction, and the review can add three to eight weeks before you can pour concrete.

What the exemption rarely touches:

• Zoning rules, including setbacks from property lines and roads
• Electrical permits, which most states handle under a separate code
• Plumbing permits if you add a washdown sink or a bathroom
• Floodplain development permits if any part of the site sits in a mapped flood zone
• Septic and well permits from the health department
• Driveway or culvert permits from the road authority

In other words, the exemption takes the building department out of the room. The zoning office, the electrical inspector, and the health department usually stay.

Who qualifies for the agricultural exemption

The test almost always looks at two things: the land and the use. The land has to be in some kind of agricultural status, and the building has to be used for agriculture rather than living, working, or storing personal things.

Proof the land is a farm

Counties ask for different evidence, but these are the documents I see accepted most often:

1. An agricultural use valuation or farm tax classification on the property tax bill
2. A farm number from the USDA Farm Service Agency
3. A Schedule F from your federal tax return showing farm income
4. A signed affidavit describing the agricultural use, sometimes notarized

Some counties set a minimum acreage, often 5 or 10 acres. Others want a minimum amount of farm income, such as $1,000 or more per year. A two acre lot with three goats and no farm income will struggle to qualify almost anywhere.

Proof the building is a farm building

The building has to house animals, store crops or feed, shelter farm equipment, or support some other agricultural operation. The exemption usually disappears the moment the building is used by the public, used as a residence, or used for a business that is not farming. A steel building that stores a tractor qualifies. The same building with a woodworking shop for paying customers does not.

Where the agricultural exemption goes wrong

The biggest trap is a change in use. You build an exempt hay barn in 2026. In 2029 you add a bathroom, a mini split, and a home office in one corner. That change can turn an exempt agricultural building into an unpermitted accessory building, and the county may then require retroactive permits, engineered drawings, and inspections on a structure that is already closed in. Opening walls for an inspector costs far more than a permit would have.

The second trap is selling the land. Buyers' lenders and appraisers often ask for permit records. An exempt building with no paper trail can stall a closing, or the appraiser may give it little value. Keep a folder with the exemption letter, the affidavit, the engineering package from the kit supplier, and photos of the foundation before the slab was poured.

The third trap is insurance. Farm policies generally cover farm buildings without asking about permits, but if a claim reveals the building was used for something else, coverage can get complicated quickly.

Why you should still build to code without a permit

Here is where I push back on the most common advice. People hear "exempt" and conclude they can order the cheapest kit, skip the engineering, and set it on whatever footing the crew prefers. That is the wrong takeaway.

The exemption removes the county's review. It does not remove snow, wind, or gravity. A steel building rated for 20 pounds per square foot of ground snow load will not care that it sits on farm land when 35 pounds lands on the roof in February. I have seen exempt pole barns and steel sheds fold under loads that a properly engineered building would have shrugged off, and farm policies sometimes push back on claims where the building was clearly underbuilt for the area.

So order the kit with the real design loads for your site. Our guide to snow load and wind zone numbers for steel buildings walks through finding them. Ask the supplier for stamped drawings even though nobody will review them. They usually cost little or nothing extra on a kit, and they are the best evidence you have later if you sell, insure, or convert the building.

The same logic applies to anchor bolts and the slab. Build it the way an inspector would want it, even though no inspector is coming. If you want to know what that looks like, read what a county inspector actually checks on a steel build and use it as your own checklist.

How to apply for an agricultural exemption step by step

The process is usually short, but doing it in the right order saves trouble:

1. Call the building department first. Ask, in plain words, "Do you have an agricultural exemption for farm buildings, and what do you need from me?" Write down the name of the person you spoke to and the date.
2. Check zoning separately. Confirm the setbacks for an accessory or agricultural building. Our article on steel building setback rules covers the common distances, often 25 to 50 feet from a road and 10 to 20 feet from side lines.
3. Gather your farm proof. Tax classification, FSA number, Schedule F, or whatever the county named on the call.
4. File the exemption form or affidavit. Some counties issue a written exemption letter, often within 5 to 10 business days. Get it in writing. A verbal "you're fine" is worth nothing three years later.
5. Pull the permits you still need. Electrical is the usual one. Budget $150 to $400 for a basic farm building service permit.
6. Keep the file forever. Scan everything and store a copy off site.

Frequently asked questions

Do I need a permit for a steel barn on agricultural land?

In many states and counties, a building used only for agriculture on qualifying farm land is exempt from the building permit. You will usually still need zoning approval, an electrical permit, and any floodplain or septic permits. Always confirm with your county and get the exemption in writing.

Can I live in or run a business from an exempt farm building?

Generally no. Living space, public use, or a non farm business typically ends the exemption. If you plan to add those uses later, it is usually cheaper to permit the building as an accessory structure from the start.

Does an agricultural exemption mean I can skip engineering?

No. The exemption only removes the county's review, not the loads your building has to carry. Order a kit designed for your local snow and wind numbers and keep the stamped drawings with your property records.