ADU builder · Chatsworth, Los Angeles
ADU builder in Chatsworth.
Design, permits, financing and construction from one local team. 600+ ADUs delivered across greater LA, including nearby Van Nuys, Lake View Terrace, Tujunga & Los Angeles.
Licensed & insured · Construction from $275/sq ft · 5.0★ rated
Building an ADU in Chatsworth
Chatsworth sits in the northwest corner of the San Fernando Valley, where the Simi Hills and Santa Susana Mountains meet the valley floor. Parts of it are horse country, with equestrian areas called out in the community plan. Porter Ranch, just to the north, runs up toward the Santa Susana Mountains. A large lot gives you more choices for where an ADU goes, though horse facilities, slopes and fire rules all affect placement. The Chatsworth and Porter Ranch planning area saw about 426 ADU permits in 2025, per state housing reports.
ADU Resource Center designs, permits and builds ADUs with one in-house team. The projects closest to you are in Van Nuys, Lake View Terrace, Tujunga and Los Angeles. In Tujunga we moved a hillside ADU on the lot to stay off the slope, and in Los Angeles we built a 728 sq ft, two-bedroom Mediterranean ADU with a red tile roof. For the area just east of you, see our Granada Hills page.
We price your project with a fixed quote before construction, and one project manager stays on it through final inspection. If you need financing, we'll help you find it.
ADUs in Chatsworth: quick facts
Updated November 2026
- Who issues ADU permits
- City of Los Angeles: LADBS (Department of Building and Safety)
- 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 Chatsworth.
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 Chatsworth and Porter Ranch.
LADBS handles both areas
Chatsworth and Porter Ranch are City of LA neighborhoods, so plans go through LADBS. The city must act on a complete ADU application within 60 days.
Horse-keeping areas
Some Chatsworth lots are in equinekeeping (K) districts, where rules on horse enclosures can affect where new living space goes. We plan around your stables and corrals from the first site visit.
Hills and fire zones
LAFD's very high fire hazard severity zone covers parts of Chatsworth and Porter Ranch, mostly in the hills. An ADU there needs ignition-resistant roofing, vents and siding, and a slope may need retaining walls or an engineered foundation.
Big lots, long utility runs
On a large lot, the farther the ADU sits from the house, the longer the water, sewer and electrical lines get. Use the ADU cost calculator for a starting number, and we'll price site work in the fixed quote.
What it costs
ADU cost in Chatsworth
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 Chatsworth 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
Chatsworth ADU questions, answered.
Still have a question? Ask us during your free consultation.
Are Chatsworth and Porter Ranch ADUs permitted by the City of LA?
Yes. Both are neighborhoods of the City of Los Angeles, so ADU plans go to LADBS, not to LA County. We draw the plans, submit them, answer the plan-check comments and pull the permit for you.
I keep horses. Can I still add an ADU?
Usually there's a way, but placement matters. Parts of Chatsworth are in equinekeeping (K) districts, and the city can require distance between horse enclosures and new living space. We map your corrals, stables and setbacks before we pick a spot for the ADU.
How much does it cost to build an ADU in Chatsworth?
We build at $275, $300 or $325 per sq ft for basic, mid-range or luxury finishes, so a 600 sq ft one-bedroom comes to about $165K–$195K in construction. Long utility runs on a big lot, difficult access or hillside work can raise the fixed quote, and we spell that out before construction.
My Porter Ranch home is in an HOA. Does that stop me?
California law limits how far an HOA can go in blocking an ADU, but the association can still set reasonable rules on things like design. Send us your CC&Rs early and we'll design with them in mind. For questions about what your HOA can enforce, talk to a professional who handles HOA law.
Can I convert my garage in Chatsworth instead?
Often, yes. Our garage conversion rates are $235, $260 or $285 per sq ft, and a typical two-car garage lands at about $95K–$125K. The existing garage doesn't need to meet new setbacks, but its slab and framing have to be sound, so we inspect it first.
Free consultation
Ready to build your ADU in Chatsworth?
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.
