Free California Permit, Property & Site Plan Tools
Use one connected toolkit for permit requirements, ADU feasibility, zoning sources, parcel research, site-plan checklists, cost planning, lot coverage, SB 9 screening, corrections and AI pre-checks.
Start With the Question You Need Answered
Each tool works independently, but the address and project data can carry forward to the next tool in the same browser.
California Permit Requirements Checker
Check likely California permit requirements by address and project type before you spend time preparing the wrong documents.
Open Tool → ADU feasibility checkerCalifornia ADU Feasibility Checker
Enter a California address to screen ADU feasibility, identify the likely ADU path, review major property constraints, and see what still needs verification.
Open Tool → zoning lookup by addressCalifornia Zoning & Setback Lookup
Resolve your property to the correct California jurisdiction, open the official zoning source, and turn zoning and setback information into project-specific guidance.
Open Tool → parcel map by address CaliforniaCalifornia Parcel Map & APN Lookup
Start with a California address to identify the county, map the property location, open official parcel resources, and organize APN information for site-plan research.
Open Tool → site plan checklistSite Plan Checklist Generator
Generate a California site-plan checklist based on your project type and property location before you submit.
Open Tool → site plan cost calculatorSite Plan Cost Calculator
Estimate a planning range for site-plan drafting based on project type, property complexity, source documents and permit status.
Open Tool → lot coverage calculatorLot Coverage & Buildable Area Calculator
Calculate lot coverage, remaining open area and a preliminary buildable envelope, then compare the result with a local zoning maximum.
Open Tool → SB9 eligibility checkerCalifornia SB 9 Eligibility Checker
Screen a California property for potential SB 9 two-unit development or urban lot split eligibility.
Open Tool → do I need a site plan for a permitDo I Need a Site Plan? Checker
Answer a few questions about your property project to see whether a site plan is commonly part of the permit package.
Open Tool → permit rejection analyzerPermit Correction & Rejection Analyzer
Paste or upload your permit correction comments and get a prioritized explanation of what likely needs to change before resubmittal.
Open Tool → site plan checkerAI Site Plan Pre-Check
Upload a site plan and run a preliminary permit-readiness check for common missing details before you submit.
Open Tool → building permit fee calculator CaliforniaCalifornia Permit Fee & Plan Check Fee Estimator
Estimate a preliminary building-permit and plan-check budget range, then verify the result with the official local fee source.
Open Tool →One Property. One Research Workflow.
The system can carry address, APN and project type between tools so users can move from early feasibility to permit preparation without starting over.