1 bedroom
One-bedroom with kitchen island
1 bed1 bath
Home · Service areas · Simi Valley
ADU design-build · Simi ValleyADUs in Simi Valley
Family homes with attached two-car garages and generous side yards: Simi Valley suits both garage conversions and detached one-bedroom ADUs.
What applies to your lot
Building an ADU in Simi Valley
Who approves your ADU
City of Simi Valley (Ventura County): ADU standards are in section 9-44.160 of the municipal code, reviewed by the Planning Division, and the city publishes an ADU guide. The standards are being updated in 2026; state ADU law applies where they differ.
Attached garages
Many homes have an attached two-car garage. It can become a junior ADU or an ADU while the house stays as it is.
Flood and fire zones
Some lots near the Arroyo Simi are in FEMA flood zones, and hillside edges can be in fire hazard zones. Both change the foundation and the materials.
School district fees
For larger units, the city ADU guide sends applicants to Simi Valley Unified for school fees. We include them in the estimate.
California law, everywhere
The rules every city must respect
800 sq ft
Every city must allow at least an 800 sq ft detached ADU with 4 ft setbacks.
4 ft
Maximum side and rear setback for a new detached ADU.
750 sq ft
No impact fees up to this size.
60 days
To approve or deny a complete application, without a hearing.
Ideas for your lot
Plans that suit Simi Valley lots
2 bedrooms
Compact two-bedroom
2 beds1 bath
Garage conversion
Two-car garage, 22 × 22
2-car 22×22Legal ADU
FAQ
ADU questions in Simi Valley
Who approves an ADU in Simi Valley?
The City of Simi Valley. Approval is ministerial: no public hearing, and a decision within 60 days of a complete application.
Can I convert my attached garage?
Yes, as a junior ADU of up to 500 sq ft or as an ADU, with no replacement parking required.
Is the free visit available in Simi Valley?
Yes. We come to your property, review the lot and explain what is possible.
Nearby areasThousand OaksSan Fernando Valley
Free feasibility call
Book a free 15-minute feasibility call
A project lead reviews your address, tells you what your lot can hold and gives you a first look at your financing eligibility.
What you get
- Free, with no obligation
- A clear answer on what your lot can hold
- A first look at financing eligibility, by phone or at your property
- A site visit only if it makes sense
Prefer to talk now? (424) 448-4895
Email: [email protected]
Los Angeles, CA · We come to your property
1 · Preferred time2 · Your property3 · Confirmed
Preferred day (Pacific time)
Preferred time
Tell us when to call you. A project lead calls you back at that time of day (Pacific time).
Your call is booked
We’ll confirm by text or phone. No obligation.
Service areas
Serving homeowners across Los Angeles
Los Angeles, the South Bay and Orange County, within about 40 miles of Paramount. Farther on request.
Service areas
ADU rules, city by city
Permits, fire and coastal zones, pre-approved plans: see what applies in the 36 cities we serve.
Central Los AngelesSan Fernando ValleyThousand OaksSimi ValleyParamountWest AdamsMid-CityCulver CityLong BeachDowneyWhittierNorwalkTorranceInglewoodComptonCarsonAnaheimSanta AnaIrvineHuntington BeachPasadenaGlendaleBurbankRialto (on request)Garden GroveOrangeFullertonCosta MesaNewport BeachTustinSherman OaksEncinoVan NuysWoodland HillsNorthridgeCalabasas