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What Data Is in a Building Permit? (Field Guide)
Building permits hold more useful data than most contractors realize. A breakdown of every field in a typical permit, and which ones matter most for leads.
Most contractors know building permits are public records. Fewer know exactly what's inside them, or how to use that information to find new clients. A well-structured permit record contains a surprising amount of data. Here's the full breakdown.
The Standard Building Permit Data Fields
Every city formats its permits slightly differently, but most residential building permits in the United States contain some version of these fields:
| Field | What It Means | Useful For |
|---|---|---|
| Permit Number | Unique ID assigned by the city | Tracking and de-duplication |
| Issue Date / Filing Date | When the permit was applied for or approved | Identifying fresh leads (within last 7–30 days) |
| Address | Full property address | Direct mail, door knocking, owner lookup |
| Permit Type | Category of work (building, electrical, plumbing, mechanical) | Filtering to your trade type |
| Work Description | Free-text description of planned work | Understanding scope before outreach |
| Estimated Project Value | Owner-estimated cost of the project | Prioritizing high-value leads |
| Owner Name | Registered property owner | Personalized outreach when available |
| Contractor of Record | The contractor listed on the permit (if any) | Tells you if a contractor is already hired |
| Permit Status | Applied, Issued, In Review, Finaled | Filtering for active, open permits |
| Neighborhood / Ward / District | Sub-area classification | Targeting specific service areas |
| Parcel ID / APN | Assessor's parcel number | Cross-referencing with county property records |
| Stories / Square Footage | Building size details (when filed) | Estimating project scale |
Which Fields Matter Most for Contractor Lead Gen
Not every field is equally useful. Here's how to prioritize them for outreach:
- Issue Date, is the permit recent? Leads older than 60 days are significantly less likely to convert
- Contractor of Record, if this is blank, a contractor hasn't been hired yet. That's your window
- Estimated Project Value, prioritize high-value permits to maximize revenue per outreach effort
- Address, your most essential field. Everything flows from the property location
- Work Description, lets you confirm the work type matches your services before reaching out
- Owner Name, when available, enables personalized letters that outperform generic mailers
What's NOT in a Permit (That You Might Expect)
A common misconception is that permits include direct phone numbers or email addresses for property owners. They almost never do. Building departments collect mailing addresses, not contact info. To reach a homeowner by phone, you'd need to cross-reference the permit address with a property records database or county assessor data.
Similarly, permits don't tell you whether a contractor has been hired unless the contractor is listed as contractor of record. A blank contractor field means the work is likely pending, not that the owner is uninterested.
How Cities Differ (And Why It Matters)
The same permit type can be labeled very differently across cities. In New York City, alteration permits are categorized as ALT1 (major alterations) and ALT2 (minor alterations). In Austin, the equivalent might be 'Building Alteration - Residential.' In Chicago, it's a 'Permit, Easy Permit' or 'Permit, Electrical' depending on the work.
This is why raw city portal data is hard to work with: comparing renovation activity across multiple cities means normalizing field-level data across each market. Permit Ledger handles this classification so you don't have to, every insight is already filtered to residential renovation, remodel, and addition work.
Putting the Data to Work
Once you have a permit CSV with the fields above, the simplest outreach workflow is:
- Filter for permits issued in the last 7–14 days
- Remove any records where Contractor of Record is filled in
- Sort by Estimated Project Value descending
- Send a postcard or letter to the top 25–50 addresses
- Track which permits produce inquiries and refine your filters over time
Even a 1–2% response rate on 200 addresses produces 2–4 warm inbound leads per week, all from homeowners who've already committed to starting a renovation.
Frequently asked questions
What data fields are actually in a building permit?
At minimum: property address, permit number, permit type (renovation/remodel/addition/repair), filing date, issue date, applicant name, and a free-text work description. Most cities also include estimated job value, contractor name (if assigned), and parcel/zoning data. See what is a building permit for the full breakdown.
Are homeowner phone numbers or emails included?
No. Permit records are public, but personal contact info is not. The address is what you use, perfect for direct mail, door-knocking, or layering against a skip-trace service if you need phone numbers for outbound calling.
How accurate is the project value field?
It's the homeowner's or contractor's declared estimate at filing time, so it's directional rather than precise. Permit values tend to be on the conservative side. They're still useful for sorting outreach lists, an $80k addition is a very different lead than a $4k repair. Read the permit history guide for how project value evolves on amended permits.
Can I trust permit data to be consistent across cities?
The schema varies city to city, Chicago's column names look nothing like NYC's. That's part of what makes raw portal data painful to use. Permit Ledger normalizes the most useful fields across all 338 cities so the insights for Chicago read the same as the ones for Seattle. See the cities we cover for the full list.
See your city's free permit insights →Related guides
- What Is the AHJ (Authority Having Jurisdiction)?
- What Is a Parcel Number? Definition and How to Find It
- Unpermitted Work: What Happens If You're Caught
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