How to check a property’s zoning by address

Short answer: find the city or county's official zoning map, search the address, and note the zoning district and any overlays. Then read what that district allows and check the building's certificate of occupancy. If the use is at all unclear, ask the planning department before you promise anything to a client.

Zoning tells you what a piece of land can be used for. It doesn't tell you whether a specific business can move into a specific unit, which is usually what you really want to know. Here's how to answer both.

Step 1: Find the right zoning map

Search for your city or county's name plus "zoning map". You want the official planning department site or GIS viewer, not a third-party copy.

Check who actually controls the property first. A mailing address that says one city can sit in unincorporated county land, and then the county's rules apply.

Then search the address and confirm the highlighted lot is the one you mean. Listings sometimes cover more than one lot, so save the parcel number too. If the address search fails, try the parcel number or find the site on the map.

Maricopa County's zoning map, for example, lets you search by address or assessor parcel number.

Step 2: Write down the district and any overlays

The map will show a code like C-2 or M1-1. That's the base district. Turn on any overlay or special district layers as well, because they can add rules on top of the base district.

Then open the zoning code for that district. In New York, you'd use ZoLa to find the district and the Zoning Resolution to read the rules.

Step 3: Describe the actual use

"Retail" is usually too vague to get a real answer. Say what actually happens in the space: customers coming in, food being made, storage, deliveries, assembly, hours, anything outdoors.

Say your client wants a showroom with storage and some light assembly. That's three activities, and each may fall under a different use category in the local code. Look up all three.

Step 4: Check the certificate of occupancy

Zoning covers the land. A certificate of occupancy covers the building, and it can say something different.

In New York City, the Department of Buildings treats it as the record of a building's legal use. Older certificates are in BIS, and requests from March 1, 2021 onward are in DOB NOW. Other places have their own systems.

Read the part that covers your floor or unit, since a certificate for one floor doesn't cover the others. If you can't find one, don't assume the worst. New York exempts certain pre-1938 buildings, for example, so ask.

Step 5: Ask the planning department

If the use isn't clearly allowed, call or email the planning department with the address, unit and your description, then ask:

"For this parcel and this use, which category applies, and what approvals would we need?"

If the listing, the map and the building record disagree, ask which one governs. If the answer could make or break the deal, get a land use attorney or consultant to review it before you tell a client it's approved.

What to save

Keep a short note you can reuse, and date it, since rules change:

Next, you may want to find out who owns the property. If you're comparing purchases, note zoning differences in your sales comps.

Frequently asked questions

Can I look up zoning for free?

Yes. Most cities and counties publish a zoning map online for free. Some smaller places may need a phone call or email.

What's the difference between zoning and a certificate of occupancy?

Zoning sets what the land can be used for. A certificate of occupancy records the approved use of a building or part of it. You need to check both.

Does a listing's zoning description count?

No. Treat it as a lead and confirm it on the official map.

Who can confirm whether a use is allowed?

The local planning or zoning department. For anything material to a deal, get a land use attorney or consultant as well.