Costs & budgets
How much does an ADU cost in Brentwood?
Brentwood ADUs cost $85K–$165K for a garage conversion and $230K–$420K for a detached new build in 2026 — typical of the Los Angeles market. Lot conditions, utility upgrades, and finish tier are the biggest swing factors.
Brentwood construction labor and permit fees track the broader Los Angeles market within ±10%. Hillside parcels, historic overlays, and corner lots can each add 8–15% to the base number.
Two-thirds of Brentwood ADU budgets land within ±15% of the midpoint when scope is locked early. Most cost surprises come from late selection changes or undiscovered site conditions.
Keep reading
Related questions
- • How long does it take to build an ADU in Brentwood?
- • Do I need a permit for an ADU in Brentwood?
- • What's the cheapest ADU type in Brentwood?
Made it this far?Leo's on site · replies in ~3h
Then you're serious. Let's put it on a clipboard.
- 10-minute call with the foreman
- We tell you what your build actually costs, today
- No follow-up unless you ask
Free · Same-week scheduling