ADU cost in Los Angeles (2026).
Real price ranges from Pacific ProWorks for new detached ADUs and garage conversions, with add-ons like HVAC, solar and plans.
Estimates only — your price is set in writing.
Figures on this page are typical ranges from recent Los Angeles projects, shown to help you plan. They are not a quote or an offer. Your price is fixed only in a signed contract after a site visit, and it depends on scope, site conditions, finish level and current material costs. City permit and inspection fees are paid by the homeowner. Offers have terms and some cannot be combined.
What a new ADU costs.
| Option | Typical price* | Details |
|---|---|---|
| 400 sq ft | $140,000–$180,000 | Base build at $350–$450 per sq ft |
| 600 sq ft | $210,000–$270,000 | Base build at $350–$450 per sq ft |
| 800 sq ft | $280,000–$360,000 | Base build at $350–$450 per sq ft |
| 1,000 sq ft | $350,000–$450,000 | Base build at $350–$450 per sq ft |
| 200 sq ft garage conversion (1-car garage) | $40,000–$50,000 | Conversion at $200–$250 per sq ft |
| 400 sq ft garage conversion (2-car garage) | $80,000–$100,000 | Conversion at $200–$250 per sq ft |
| 600 sq ft garage conversion (3-car garage) | $120,000–$150,000 | Conversion at $200–$250 per sq ft |
*Rough ranges from recent Los Angeles projects, price list as of October 2026. Not a quote.
Build your own ADU estimate.
Pick the size and extras you want, see a rough price range right away, then send your picks for a free site visit.
What is included and what you supply.
Included in the base price
- Foundation (slab)
- Framing
- Electrical
- Plumbing
- Gas
- Sewer connection
- Insulation
- Drywall
- Closet
- Mechanicals (rough-in)
- Exterior siding or stucco
- Interior and exterior paint
- Roofing
- 1 kitchen and 1 bathroom (labor and building materials)
- Flooring installation
- Appliance and fixture installation
Supplied by the homeowner
Installation is included.
- Countertops
- Backsplash
- Tile
- Cabinets
- Faucets and plumbing fixtures
- Light fixtures
- Appliances
- Flooring material
- Windows and doors
- Bathroom fan
ADU upgrades and systems.
| Item | Typical price* | Details |
|---|---|---|
| Raised foundation | $5,000–$10,000 | Raised floor on a perimeter foundation with crawl space, often used on sloped lots or to match the main house. |
| Mini-split | $4,000–$6,000 | Ductless heat pump with a wall unit and outdoor condenser, for heating and cooling. |
| HVAC with ducts | $15,000–$20,000 | Central heating and air with ductwork and vents to each room. |
| Tank water heater | $4,000–$8,000 | Standard storage-tank water heater installed with required venting, seismic straps and connections. |
| Tankless water heater | $6,000–$10,000 | On-demand tankless water heater with venting and gas or electric connection. Saves space and heats water as needed. |
| Electrical subpanel | $4,000–$8,000 | A separate electrical subpanel to power the ADU from the main panel. A main panel or utility service upgrade, if needed, is extra. |
| Solar | $10,000–$16,000 | Solar panel system for the ADU. California’s energy code (Title 24) requires solar on most new detached ADUs. |
| Plans, engineering & Title 24 | $6,500–$10,000 | Architectural plans, structural engineering and Title 24 energy report for the permit application. City plan-check and permit fees are paid by the homeowner. |
How long an ADU takes.
A new ADU usually takes 6–10 months of construction and a garage conversion 6–8 months, after plans and city permits. Plan check can add weeks to months.
Adu cost FAQ.
Step 1 — pick a topic. Step 2 — click a question.
How much does an ADU cost in Los Angeles?
A new ADU base build runs about $350–$450 per square foot, for example $140,000–$180,000 for 400 sq ft and $280,000–$360,000 for 800 sq ft, with the homeowner supplying finishes.
How much is a garage conversion?
About $200–$250 per square foot, for example $80,000–$100,000 for a 400 sq ft two-car garage.
Are plans included?
No. Plans, structural engineering and Title 24 energy calculations for an ADU run about $7,000–$10,000.
Is this a quote?
No. These are rough ranges for planning only. Your price is set in a written contract signed by you and Pacific ProWorks Inc. after a free site visit.
Are city permit fees included?
No. City permit, plan-check and inspection fees are paid by the homeowner and are not included in these ranges.
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