What are the key sources you are pulling data from?

We gather permit data from a variety of municipal and county government sources across the United States. Our key sources include:

• Local jurisdiction websites: We collect data directly from city and county building departments' online permit portals
• Municipal open data portals: Many jurisdictions publish their permit data through dedicated open data initiatives
• Building department APIs: When available, we connect to official jurisdiction APIs to access permit information
• Public records requests: For jurisdictions without digital access, we obtain data through formal records requests

We then supplement this permit data with additional information from:

• State contractor licensing boards: To verify contractor information and licensing status
• Address standardization databases: We use multiple sources (National Address Dataset from the US Census, Open Address dataset, Simple Maps, and ESRI) to standardize and geocode addresses
• Tax assessor records: To enhance property information associated with permits

Currently, we cover jurisdictions representing about 80% of the US population, with new jurisdictions being added monthly.