ADU builder · West Covina, CA
ADU builder in West Covina.
Design, permits, financing and construction from one local team. 600+ ADUs delivered across greater LA, including projects in and around West Covina.
Licensed & insured · Construction from $275/sq ft · 5.0★ rated
Building an ADU in West Covina
West Covina has flat neighborhoods and hillier ones, so one lot might have a level backyard and another a slope that needs grading. A backyard ADU is often for family: grown kids who want their own place, or parents who move out back and hand the main house to the kids. The city reported about 101 ADU permits in 2023 and about 134 in 2024 to the state.
We designed and built a two-bedroom, two-bath ADU in West Covina for a homeowner's family. Our designer drew the first plans, then she came into our office to adjust them in 3D: where the bedrooms went, where to add a window. We kept the unit just under 750 sq ft to save on city fees, and the vaulted ceiling makes it feel larger. Close by we've also built in Covina, La Puente and Claremont.
You get a fixed quote before construction starts, one project manager through final inspection, and help lining up financing.
ADUs in West Covina: quick facts
Updated November 2026
- Who issues ADU permits
- City of West Covina
- Our construction rates
- $275, $300 or $325 per sq ft (basic, mid-range, luxury); garage conversions $235–$285 per sq ft
- Example cost
- A 600 sq ft one-bedroom runs about $165K–$195K in construction
- Size limits under state law
- Detached ADUs up to 1,200 sq ft on many lots; junior ADUs up to 500 sq ft inside the home
- Permit decision
- State law requires a decision within 60 days of a complete application
- Who builds it
- ADU Resource Center: design, permits and construction by one team, 600+ ADUs delivered, office in Glendale
ADU rules change. We confirm the current rules for your lot on the free consultation.
Real projects in and around West Covina
Our work in and around West Covina.
Hear it from our clients
Homeowners on building their ADU with us
More stories on our testimonials page.
Local know-how
What to know before building in West Covina.
Second Unit Review
West Covina's Planning Division reviews ADUs through a Second Unit Review application. The state's housing department reviewed the city's ADU ordinance in 2026 and flagged parts to change, so we work from the current rules.
Pre-approved designs
The city has pre-approved detached ADU designs with their own application. We can build one of those or start from our floor plans.
Hillside and fire zones
The city's fire hazard map includes high and very high zones. A sloped or fire-zone lot can mean a soils report, an engineered foundation and fire-resistant materials, which we price up front.
Size and city fees
On our West Covina project, staying under 750 sq ft saved on city fees. Our cost calculator shows how size changes the construction number.
What it costs
ADU cost in West Covina
We build at a flat rate per square foot: $275 (basic), $300 (mid-range) and $325 (luxury) finishes. Here's what that means for common sizes. Construction only; design, permits and city fees are quoted separately on your consultation.
| ADU size | Basic | Mid-range | Luxury |
|---|---|---|---|
| 400 sq ft studio | ~$110K | ~$120K | ~$130K |
| 600 sq ft 1-bedroom | ~$165K | ~$180K | ~$195K |
| 800 sq ft 2-bedroom | ~$220K | ~$240K | ~$260K |
| 1,000 sq ft 2–3 bedroom | ~$275K | ~$300K | ~$325K |
Get a number for your exact size: ADU cost calculator · Browse ADU floor plans · Converting a garage? See garage conversion cost.
Free consultation
Start your West Covina ADU.
Tell us about your property. We'll confirm what's buildable, give you a real price range and walk through financing within 1 business day.
Questions
West Covina ADU questions, answered.
Still have a question? Ask us during your free consultation.
What did you build in West Covina?
A two-bedroom, two-bath ADU built for the homeowner's family, on what had been a flat, open backyard. We kept it just under 750 sq ft to save on city fees. It has a vaulted ceiling, a kitchen with gray shaker cabinets, a farmhouse sink and a peninsula, and French doors out to a deck. The homeowner talks through the project in the video on this page.
How do ADU permits work in West Covina?
West Covina's Planning Division reviews ADUs and junior ADUs through what it calls a Second Unit Review application, followed by building plan check. We fill out the application, draw the plans and respond to the city's corrections.
Does West Covina have pre-approved ADU plans?
The city offers pre-approved detached ADU designs with their own application track. They can cut design time, but each one still needs a site plan for your lot. We'll compare them with a custom layout so you can choose.
How much does an ADU cost in West Covina?
Construction is $275, $300 or $325 per sq ft by finish level, so a 600 sq ft one-bedroom costs roughly $165K–$195K to build. Garage conversions are $235–$285 per sq ft. Hillside lots, long utility runs or a panel upgrade can raise the fixed quote, and we price those before you sign.
Is West Covina in a fire zone?
Parts of the city are. West Covina's fire hazard severity zone map shows moderate, high and very high zones, and a lot in one of them can need ignition-resistant materials and brush clearance. We look up your parcel on the current map before design.
Free consultation
Ready to build your ADU in West Covina?
Tell us about your property and we'll confirm what's buildable, give you a real price range and lay out financing on one free call.
