Know what you can build —
before you build it.
Instantly analyze zoning, regulations, and development potential for your property.
Takes ~60 seconds • We may follow up with insights about your property
How GoCodebook works
A research workflow for understanding a property and the requirements to investigate.
1. Tell us the property
Drop an address. We pull parcel, zoning, and jurisdiction details automatically.
2. Codes, decoded
GoCodebook reads zoning, planning, building, and rent-control codes that apply to your lot.
3. Custom analysis
Use source-based research to identify potential requirements, assumptions, and questions for professional review.
What GoCodebook covers
Every layer of regulation that touches your property — in one place.
Who it's for
Homeowners
Investigate requirements for an ADU, remodel, or lot split.
Investors
Investigate regulatory constraints before underwriting a property.
Architects
Front-load entitlement risk before drawings start.
Agents
Win listings with a real answer to "what can I build here?"
Get your free property survey
10 quick questions. We'll email you a starter feasibility summary within 1 business day.
Do you own the property?
Helps us tailor advice to your situation.
We respect your privacy. Read ourprivacy policy.