Los Angeles County ADU Cost Calculator
Estimate a Los Angeles County ADU budget from unit size, construction cost, design, permits, utility work and contingency. Enter your own values to produce a transparent project-specific estimate.
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Works with WordPress, Webflow, Squarespace, Wix, Framer, Shopify, and any website that supports custom HTML or iframes.
Use the primary result for planning, then review the supporting outputs and assumptions before ordering materials or requesting quotes.
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How to Use This Calculator
Enter the requested project dimensions and assumptions. Review the intermediate outputs before using the final estimate.
Formula & Methodology
The calculator converts the entered dimensions and assumptions into the displayed quantities or costs using the formulas shown in the result breakdown.
Worked example
A 700 sq ft ADU can be modeled with a per-square-foot construction rate plus separate soft-cost and utility allowances.
Los Angeles County contains multiple jurisdictions. Fees, fire requirements, utility upgrades, hillside conditions and local review processes differ.
Planning estimate only. Verify dimensions, product data, local requirements and supplier or contractor pricing before purchasing or starting work.
Related Guides
Frequently Asked Questions
- What does the Los Angeles County ADU Cost Calculator calculate?
- Estimate a Los Angeles County ADU budget from unit size, construction cost, design, permits, utility work and contingency.
- Can I change the assumptions?
- Yes. Every major dimension, rate, allowance or conversion assumption is editable so the estimate can match the project.
- How accurate is the result?
- Los Angeles County contains multiple jurisdictions. Fees, fire requirements, utility upgrades, hillside conditions and local review processes differ.
Published 8/9/2026