ADU builder · Rosemead, CA
ADU builder in Rosemead.
Design, permits, financing and construction from one local team. 600+ ADUs delivered across greater LA, including nearby Alhambra, Montebello, West Covina & La Puente.
Licensed & insured · Construction from $275/sq ft · 5.0★ rated
Building an ADU in Rosemead
Many single-family lots in Rosemead have room behind the house for a backyard unit. Homeowners add ADUs here for relatives, for rental income or to keep a grown child close. The city issues more ADU permits than some larger neighbors: about 136 in 2025 and about 129 in 2023, per state housing reports.
Our nearest projects are in Alhambra, where we built a single-story ADU with mini-splits and an open kitchen, in Montebello and in La Puente, where a two-bedroom, two-bath detached ADU was built as a rental. Our Alhambra page has photos.
You get one fixed quote covering construction, a project manager who runs the job from design through final inspection, and help finding financing that fits.
ADUs in Rosemead: quick facts
Updated November 2026
- Who issues ADU permits
- City of Rosemead
- 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 nearby
ADUs we've built near Rosemead.
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 Rosemead.
Planning review comes first
In Rosemead, an administrative site plan and design review with the Planning Division happens before Building plan check. Plans that already meet the city's standards move through that step with fewer comments.
City pre-approved plans
Rosemead keeps a list of pre-approved detached ADU plans in two- and three-bedroom sizes. We can build one of those or design from our floor plans.
One of the busier ADU cities
Rosemead reported about 136 ADU permits in 2025, more than Alhambra or Monterey Park that year. City staff see a steady flow of ADU plans.
A unit with its own address
Rosemead lets an ADU have its own mailing address, and it can be rented out or lived in by the owner. That helps when a parent or tenant needs their own mail. Our ADU financing guide covers how owners pay for the build.
What it costs
ADU cost in Rosemead
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 Rosemead 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
Rosemead ADU questions, answered.
Still have a question? Ask us during your free consultation.
What reviews does a Rosemead ADU need?
Rosemead asks for an administrative site plan and design review with the Planning Division before the building permit application goes into plan check. After Planning signs off, the Building plan check covers structure, energy and the rest. We prepare both packages and respond to each round of comments.
Does Rosemead have pre-approved ADU plans?
Yes. The city has pre-approved several detached ADU plans, from 800 sq ft two-bedrooms up to 1,200 sq ft three-bedrooms, which owners buy from the designer. They can speed up design, but your lot still needs a site plan and utility review. We'll tell you whether one fits your yard or a custom layout would work better.
Can I rent out an ADU in Rosemead?
Rosemead's ADU page says an ADU can be rented or lived in by the owner, and it can get its own mailing address. Short-term rentals are generally restricted for ADUs, so plan for longer-term tenants or family. We can't promise a rent amount, but our rental income calculator gives you a way to run the numbers.
How much does a Rosemead ADU cost?
Construction is $275, $300 or $325 per sq ft by finish level. At those rates a 600 sq ft one-bedroom costs about $165K–$195K to build, and garage conversions run $235–$285 per sq ft. Utility upgrades, like a bigger electrical panel or a new sewer line, can change the fixed quote.
Can I add a junior ADU too?
On many single-family lots, state law allows a junior ADU of up to 500 sq ft inside the house in addition to a detached ADU. It's a lower-cost way to add a bedroom suite for a parent or adult child. We check your lot against Rosemead's current rules first.
Free consultation
Ready to build your ADU in Rosemead?
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.
