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2026 California Pricing All-in Cost Ranges

ADU Cost Calculator (2026)

Real all-in pricing for every ADU type across LA County, Orange County & the Inland Empire.

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2026 ADU Cost Ranges by Type

TypeSizeAll-in Total
Garage Conversion300–500 sfCustom quote
Junior ADU (JADU)up to 500 sfCustom quote
Attached ADU500–1,200 sfCustom quote
Detached Studio350–500 sfCustom quote
Detached 1-Bedroom500–750 sfCustom quote
Detached 2-Bedroom750–1,200 sfCustom quote

Pricing varies by city

Permit fees, labor costs, and site requirements differ by city across LA County, Orange County, and the Inland Empire. Coastal OC and parts of LA tend to run higher; the Inland Empire is typically the most affordable. Every Vision ADU project is custom-quoted based on your address, lot, and finish selections — never a generic per-square-foot estimate.

What is included in our all-in estimate

Vision ADU's written estimates include architectural design, structural engineering, Title 24 energy calcs, permits and plan check, soils report (if required), foundation, framing, plumbing, electrical, HVAC, drywall, paint, cabinets, flooring, appliances, doors and windows, solar PV (when required by state law), utility connections, and final inspections through certificate of occupancy.

Get a precise quote for your property

An online calculator is a useful starting point. For an exact number, book a free site evaluation. Schedule yours or call (866) 668-4264.

City-specific cost guides

Related reading

Frequently Asked Questions

How much does an ADU cost in California in 2026?

Every ADU project is priced individually based on size, type, city, finishes, and site conditions. Vision ADU provides a written, itemized estimate within 72 hours of a free site evaluation — no generic per-square-foot guessing.

What is the cheapest ADU to build?

Garage conversions and Junior ADUs (JADUs) are typically the most affordable permitted ADU paths because they reuse existing structure. The right choice depends on your lot, goals, and existing layout.

How much does a 1,200 sq ft ADU cost?

A full 1,200 sf detached ADU is on the higher end of the spectrum. Final pricing depends on city, finishes, and site conditions — we deliver a written estimate within 72 hours of a free site evaluation.

Does the estimate include permits and utilities?

Yes — our written estimates include design, permits, plan check, foundation, framing, utilities, finishes, solar PV, and final inspections. A true all-in number, not a per-sf shell estimate.

Can I get a precise ADU quote for my address?

Yes — book a free site evaluation and Vision ADU will deliver a written, itemized estimate within 72 hours.

Get a real number for your address

Free site evaluation + written estimate in 72 hours.

Book Free Consultation (866) 668-4264