Most permit confusion comes from treating "a permit" as one thing. It is usually two things, issued by two departments, answering two questions that have nothing to do with each other.
A building permit asks whether your project is built safely: footings, framing, spans, fire separation, electrical. A zoning permit asks whether your project is allowed where you are putting it: the right district, the right use, inside the setbacks, under the height limit, within the lot coverage.
You can need both, either, or neither. The expensive mistake is assuming that being exempt from one exempts you from the other, and the building code says so in the same sentence that grants the exemption.
The Two Questions, and Who Asks Them
The distinction is easier to hold onto if you think about what each reviewer is looking at.
A building permit goes to the building department. The reviewer wants construction drawings: how deep the footings go, how the ledger is attached, what size the joists are. Approval comes with inspections during construction, and the permit is closed out when the work passes final inspection.
A zoning permit goes to the zoning or planning department. The reviewer wants a site plan: where the lot lines are, where the structure sits relative to them, how much of the lot is covered, how tall the structure is. It is usually a paper review with no inspection, and it happens before the building permit, because there is no point reviewing how something is built if it is not allowed to be there.
The naming is inconsistent across the country, which is part of why this is confusing. The same approval is called a zoning permit, a zoning certificate, a certificate of zoning compliance, a zoning approval, or in Pittsburgh a Registration of Zoning Approval. Dayton calls it a Zoning Certificate. Cincinnati calls it a Zoning Certificate too. When in doubt, describe what you want to build and ask whether anything besides the building permit is required.
The Sentence That Causes All of This
The International Residential Code (IRC) is the model code most US residential construction is built to. Its Section R105.2 lists work that does not need a building permit, and it opens with this:
Exemption from permit requirements of this code shall not be deemed to grant authorization for any work to be done in any manner in violation of the provisions of this code or any other laws or ordinances of this jurisdiction.
"Any other laws or ordinances of this jurisdiction" is the zoning code. The exemption is narrow and specific: it waives the building permit, and it waives nothing else.
Here is the exempt list that follows it, which is where most homeowner projects sit:
- One-story detached accessory structures, provided the floor area does not exceed 200 square feet
- Fences not over 7 feet high
- Retaining walls not over 4 feet high, measured from the bottom of the footing, unless supporting a surcharge
- Decks not exceeding 200 square feet, not more than 30 inches above grade at any point, not attached to a dwelling, and not serving the required exit door
- Sidewalks and driveways
- Prefabricated swimming pools less than 24 inches deep
Every item on that list is still subject to setbacks, height limits, lot coverage, easements, and district rules. A shed, a fence, a deck, and a driveway can each be permit-exempt and still be illegal where you put them.
Note also that this is the model code. Your state and city adopt it with amendments, so the numbers above are a baseline, not your local rule.
Chicago Puts the Condition Right in the Exemption
Chicago's list of work that does not require a building permit is unusually clear about this, because it writes the zoning condition directly into the exemption. From the city's own guide:
Installing a fence that is no more than 5 feet above the ground (measured on both sides) and that conforms to the Chicago Zoning Ordinance
The second half of that sentence does real work. A 5-foot solid fence is under the building permit threshold. If it stands in a front setback where the zoning ordinance does not allow it, it is exempt from the building permit and still not allowed. The exemption was never a green light.
Philadelphia: Where the Answer Flips Between Two Numbers
Philadelphia publishes both thresholds, and they do not match, which produces a band where you need one permit and not the other.
- No zoning permit is required for sheds, playhouses, pergolas, and similar structures for one- or two-family dwellings that are in the rear yard and 130 square feet or less.
- No building permit is required for detached structures like sheds for one- or two-family dwellings that are 200 square feet or less.
So a shed of 150 square feet in a Philadelphia rear yard needs a zoning permit and needs no building permit. That is a 10 by 15 shed, which is an ordinary size sold at any big-box store. A homeowner who checks only the building code concludes, correctly, that no building permit is required, and then skips the permit they actually needed.
Five Cities, Five Different Answers for the Same Fence
Fences show the variation clearly, because almost every city treats them differently. Each of these was read from the city's own published rules:
| City | Zoning approval | Building permit |
|---|---|---|
| Dayton | Zoning certificate for every new fence, $90.91 | Only over 6 feet |
| Chicago | Must conform to the Zoning Ordinance | Only over 5 feet |
| Sandy Springs | Fence permit for every new or replacement fence, $80 | Included in that fee |
| Akron | None up to 6 feet | Summit County permit over 6 feet |
| Augusta | None for most fences, historic commission approval in the 3 historic districts | Not required for most fences |
Flint states the principle more plainly than any code section could. Its Zoning Division page says:
Note: A Zoning Permit is not required for fencing, however, Zoning Code standards must still be met.
No permit, rules still apply. That is the whole idea in one sentence, and it is the situation most homeowners are actually in.
How to Find Out Which You Need
The reliable procedure takes about 15 minutes.
1. Ask the question so it covers both. Do not ask "do I need a permit for a shed." Ask "does a 10 by 12 shed in my rear yard need zoning approval as well as a building permit?" The building counter answers building questions, and will not always volunteer the zoning answer.
2. Find the city's exempt list. Most building departments publish one, often titled "work not requiring a permit." Confirm your project is on it, and read whatever condition is attached, as in Chicago's example above.
3. Read the zoning standards even when you are exempt. You need four numbers: the side setback, the rear setback, the height limit for accessory structures, and the lot coverage limit. For corner lots, ask which street frontage counts as the front, because both often do.
4. Check for a third layer. A Homeowners Association (HOA), a historic district, a deed restriction, or a recorded easement can each require approval that has nothing to do with the city. Historic districts in particular can require a certificate of appropriateness for work that needs no other permit at all, which is Augusta's situation.
The Site Plan Is the Zoning Answer
There is a practical reason to sort the zoning question first: it is decided on one document, and that document is cheap.
A building permit needs construction drawings, which describe how the thing is built. A zoning permit needs a site plan, which describes where it sits: lot boundaries, the setback lines for your district, easements crossing the property, existing structures, and the proposed structure dimensioned to the lines.
That drawing answers the zoning question before you have spent anything on construction drawings, and for a permit-exempt project it may be the only drawing anyone asks for. If you need one, we draw permit-ready site plans from your parcel data.
Why This Matters More Than the Paperwork Suggests
Getting the building permit wrong produces a correction notice and a re-inspection. Getting the zoning question wrong produces a structure in the wrong place, and location is the one thing that cannot be fixed by adding a bracket.
Cities find these. Neighbor complaints are the most common route, aerial imagery is increasingly the second, and a property sale is the third, because the title and appraisal process surfaces structures that were never approved. The remedy for a structure inside a setback is to move it or remove it. A garage built three feet from a line that requires five does not become compliant because the framing was sound.
If you are already past this point and the work is built, our guide to retroactive permits covers the legalization route and when it works. If you are still planning, how close to the property line you can build covers how to find your setbacks.
The Bottom Line
Two permits, two departments, two questions. The building permit asks whether it is built right. The zoning permit asks whether it belongs there. The IRC exempts small sheds, low fences, ground-level decks, and driveways from the first one, and says in the same sentence that the exemption grants no authorization to violate anything else.
For most homeowner projects the practical order is: confirm the zoning standards, get the site plan that proves you meet them, then find out whether a building permit is required on top. Doing it the other way around is how a permit-exempt shed ends up two feet inside a setback.