Am I Eligible for an ADU?

A quick free check based on Twin Falls Title 10-6-10-B + Idaho state law. 4 questions, instant answer.

How accurate is this? The check applies Twin Falls Title 10-6-10-B rules (zoning district minimums, the 45% size rule, parking requirement) and flags common issues. It is NOT a substitute for a professional Feasibility Check, which involves on-site measurements, utility capacity assessment, and direct verification with Twin Falls Planning & Zoning. If this check says you are eligible, the Feasibility Check confirms exactly what you can build.

1. What is your lot size (square feet)?

Check your property tax record or county assessor site for an accurate number.

2. What is the living-space size of your primary residence (square feet)?

Living space only — exclude garage, unfinished basement, and similar non-habitable space. This determines your maximum ADU size via the Twin Falls 45% rule.

3. What is your zoning district?

Check your property tax record or call Twin Falls P&Z at 208-735-7267 — they will tell you on the phone.

4. Do you have off-street parking that could be dedicated to the ADU?

Yes No Not sure

Twin Falls requires one additional off-street parking space per ADU.

5. Are there any setback constraints (close to property line, on a corner, irregular lot)?

Yes No Not sure

6. Do you live in the home as your primary residence?

Yes No (rental investment)

About this tool:

The eligibility check applies the publicly documented rules in Twin Falls Title 10-6-10-B and Idaho Code §67-6541 (SB 1354). It does not have access to your specific property records, utility capacity, exact setback measurements, or any HOA covenants. For a definitive answer, our Feasibility Check ($250-$750, credited toward construction) includes on-site measurements + direct verification with Twin Falls Planning & Zoning.

This tool is for educational purposes only. It does not constitute legal or zoning advice. We will independently verify all factors as part of the Feasibility Check.