Backyard before ADU construction in Simi Valley
Completed backyard project in Simi Valley
Before
After
adu builder simi valley

ADU builder
Simi Valley.

ADU construction in Simi Valley runs through City of Simi Valley Building and Safety — hillside engineering, retaining walls, and tight haul routes. We handle garage conversions, detached units, structural plans, permits, and certificate of occupancy.

$90k–$160kgarage conversion
16–24 weekstypical build
6–12 weekspermit review
Bonded & Insured$2M Liability
Transparent PricingLine-item quotes
Licensed TechsPool, equipment, and startup care
5 / 5 Stars187 Google reviews
Local Conditions

ADU work in
Simi Valley.

ADUs in Simi Valley permit locally, not through LADBS, and many yards have wider side-yard access for construction staging than central LA. Foundations, garage slab reinforcement, and utility trenching have to account for Ventura County valley soils with heat, wind, and broad side-yard access on many lots. Plan check runs through City of Simi Valley Building and Safety with Title 24 energy compliance and structural review on every permitted unit. Garage conversions often move faster than detached new-builds because the shell exists; hillside lots, tight side yards, and long utility runs can still add foundation and MEP cost. Most ADU construction in Simi Valley lands in the $100,000-$300,000 range — garage conversions from $90k–$160k, detached units from $190k–$290k. Permit fees, utility connections, soils reports, and design are quoted separately by line item. Finish level, fire sprinklers, and separate utility meters are the usual cost drivers after site conditions. Wood Ranch and Big Sky homes can have HOA guidelines and slope conditions. We coordinate HOA/ARC packets — exterior materials, parking replacement, access plans — in parallel with city submittals when they apply. We already build in your backyard. Here's what we handle for Simi Valley homeowners.

01

Permits and inspections

City of Simi Valley Building and Safety handles ADU plan check, structural review, and certificate of occupancy. Typical plan check: 6–12 weeks.

02

HOA and access

Wood Ranch and Big Sky homes can have HOA guidelines and slope conditions. That drives how we stage garage conversions, utility trenching, and detached ADU placement.

03

Soil and foundation

Ventura County valley soils with heat, wind, and broad side-yard access on many lots affects foundation depth, garage slab reinforcement, and utility routing for detached units.

04

Pricing in Simi Valley

Most ADU projects here land $100,000-$300,000 — garage conversions from $90k–$160k, detached units from $190k–$290k.

Pool + ADU

Also a pool builder in
Simi Valley.

We build pools and ADUs on the same lots across Southern California. When both are planned together, shared excavation, grading, and utility trenching often saves 10–15% versus separate projects.

Pool builder in Simi Valley ADU construction overview

Nearby Cities

Also serving
nearby areas.

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Simi Valley ADU service area
Common Questions

Simi Valley
ADU FAQ.

How much does an ADU cost in Simi Valley?
Most ADU construction in Simi Valley runs $100,000-$300,000 depending on type and finish level. Garage conversions typically start $90k–$160k; detached new-build units $190k–$290k. Permit fees, utility connections, and soils work are quoted separately.
Who handles ADU permits in Simi Valley?
ADU permits in Simi Valley run through City of Simi Valley Building and Safety. Plan check typically takes 6–12 weeks. We prepare structural plans, Title 24 energy calcs, and submittals; you sign what the city requires.
Can I build an ADU and a pool on the same lot in Simi Valley?
Usually yes. Pools and ADUs have separate setback and lot-coverage rules. When both are planned together, shared excavation, grading, and utility trenching often saves 10–15% versus separate projects.
Do Simi Valley ADU projects need HOA approval?
Wood Ranch and Big Sky homes can have HOA guidelines and slope conditions When HOA or ARC review applies, we submit exterior finish boards, site plans, parking replacement details, and staging plans in parallel with the city permit package — not after plan check.
Free ADU consult

Let's scope your ADU in Simi Valley.

Share the address, ADU type, and rough budget. We reply within one business day with a time for a free phone consult — feasibility, setbacks, and a real project range, not a teaser price.

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  • Free phone consult — lot feasibility in 1 business day
  • Floor plan direction & project range in 5 days
  • No deposit until contract signed
  • Honest "no" if the lot doesn't pencil
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