How-To
How to Look Up Building Permit History by Address
How to find the complete building permit history for any US property. For homebuyers checking for unpermitted work, investors weighing risk, and contractors.
Every permitted renovation, addition, or structural change to a US property leaves a paper trail. Building permits are public records, and a complete permit history can reveal everything from a roof replacement in 2019 to an unpermitted basement conversion, information that matters to homebuyers, investors, lenders, and contractors alike. Here's how to find it.
What a Building Permit History Tells You
A property's permit history is a chronological record of every permitted construction project on that address, going back as far as the city's records are digitized, often 10–25 years for most major US cities.
From a permit history you can typically see: what type of work was done (roofing, electrical, HVAC, addition, kitchen renovation), when it was filed and finaled, how much the project was estimated to cost, and which contractor or owner pulled the permit.
What you can't see: unpermitted work. By definition, if work was done without a permit, it won't appear, which is exactly why a clean permit history isn't necessarily a clean bill of health for a property.
Why Permit History Matters, By Use Case
| Who's Looking | What They're Looking For | Why It Matters |
|---|---|---|
| Homebuyers | Was major work done with a permit? | Unpermitted work may not be covered by insurance and can affect resale |
| Real estate investors | What's been improved? What's aging? | Roof age, HVAC age, and addition history affect property value and repair budgets |
| Insurance underwriters | Are improvements documented? | Unpermitted additions can void coverage for those improvements |
| Lenders / appraisers | Does the living area match permit records? | Unpermitted additions can inflate recorded square footage |
| Contractors | What existing systems are in place? | Understanding prior HVAC, electrical, or plumbing work before starting a job |
| Real estate agents | Can we market the renovated kitchen legally? | Unpermitted work complicates disclosures and buyer due diligence |
How to Look Up Permit History on City Portals
The most direct way to find permit history for a specific address is through your city or county's building department portal. Most large US cities have digitized their permit records and made them searchable by address.
Here's how the lookup typically works:
- Go to your city's building department or open data portal
- Find the 'Permit Search' or 'Building Permit Records' section
- Enter the full property address (house number + street name)
- Review the list of permit records returned, usually sorted by date
- Click individual records to see the full detail including work type, value, contractor, and status
Common portals to check: NYC DOB Building Information System (BIS), Chicago Open Data Portal, San Francisco's DataSF, Boston's Inspectional Services, Seattle's permit search at seattle.gov, and Philadelphia's L&I database at li.phila.gov.
What to Look For in a Permit History
When reviewing a property's permit history, focus on these key signals:
- Roof permits, tells you when the roof was last replaced and lets you estimate remaining life
- HVAC/mechanical permits, identifies when heating and cooling systems were last updated
- Electrical permits, panel upgrades and rewires leave a permit trail
- Addition permits, if the listing says 4 bedrooms but only a 3-bedroom house was permitted, look into it
- Finaled vs. open status, a permit that was never finaled is a red flag; work may have stopped or failed inspection
- Owner-pulled permits vs. contractor-pulled, owner-pulled permits sometimes indicate DIY work that later needed correction
A permit with 'Final' or 'Closed' status means the work passed inspection. An open or expired permit is worth investigating further.
When City Portals Fall Short
City permit portals work well for address-specific lookups, but they have limitations. Records before the city's digitization cutoff (often 2000–2005) may not appear online at all. Some smaller jurisdictions have no searchable online portals and require an in-person or phone request. And portals generally only search within a single municipality, if you're researching a property in a suburb or unincorporated area, you'll need the county building department instead.
For contractors looking at permit history across multiple properties or cities simultaneously, to understand a neighborhood's renovation activity rather than a single address, a permit data service is a more practical tool.
Using Permit History for Investment Due Diligence
Real estate investors increasingly use permit history as part of their property due diligence. A property with a long, clean permit history (finaled permits for every major renovation) is a lower-risk investment than one with gaps, especially in cities where unpermitted work must be remediated before resale.
When evaluating a property for acquisition, cross-reference the permit history against the seller's disclosures. If the listing mentions a renovated kitchen from 2018, there should be a permit for that work. If it doesn't exist, ask why, the work may be unpermitted, which has insurance and legal implications.
Frequently asked questions
How do I find the permit history for a house?
Go to your city or county's building department portal and search by the property's street address. Most major US cities have online databases covering the last 10–25 years of permit records. Look for sections labeled 'Permit Search,' 'Building Records,' or 'Property History.'
What does it mean if a permit was never finaled?
An open or expired permit, one that was filed but never received a final inspection sign-off, is a red flag. It may mean the work was never completed, failed inspection, or the contractor left the job unfinished. Before purchasing a property with open permits, consult a real estate attorney about who is responsible for resolving them.
Can building permit history reveal unpermitted work?
Permit history can only show work that was permitted. If renovations were done without a permit, they won't appear in the record, which means a clean permit history doesn't guarantee all work was done legally. A home inspection combined with permit history research gives the most complete picture.
How far back do online permit history records go?
Most major US cities have digitized records going back 15–25 years; Chicago, NYC, San Francisco, and Boston have searchable records going back to the early 2000s. For records older than the digitization cutoff, you can usually request a paper file from the city's building department, response times run 1–4 weeks and a per-page fee may apply.
See Cities & Get Fresh Permit Data →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
Browse permits by trade
Solar permits Pool & Spa permits Roofing permits HVAC permits Plumbing permits Electrical permits