A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateADU Company in Simi Valley, CA
Lodgewick ADU Ventura builds accessory dwelling units, garage conversions, and home additions across Simi Valley, CA. A lodge is a small house on a larger property, which is exactly what an ADU is, and that idea shapes how we approach every job here. Simi Valley’s housing stock runs from 1960s ranch homes in the flatlands to newer hillside properties where setbacks and slopes change the plan fast. Whether you’re weighing a detached unit in your backyard or turning an attached garage into rentable space, call (831) 230-7250 and we’ll give you a written price before any work starts.
Why Simi Valley Homes Are Different
Simi Valley sits in a valley bowl, so summers run hot and dry while winter nights can dip near freezing. That temperature swing means insulation choices and window placement matter more here than in coastal Ventura County. Many homes in central Simi Valley were built between 1960 and 1980, which often means original electrical panels and slab foundations that need a close look before an addition or ADU goes in. Hillside lots around the north and east edges of town bring their own grading and drainage questions, and some neighborhoods have HOA design review on top of city permits.
The city’s planning rules for ADUs generally follow California state law, which has loosened restrictions on setbacks and parking in recent years. Still, older lots on septic systems, which exist in pockets of Simi Valley, may need additional review. Flat, rectangular lots in neighborhoods near Royal Avenue, Alamo Street, and Erringer Road tend to be the most straightforward builds. Properties with significant slope or unusual lot shapes take more engineering, which is why we put our pricing in writing up front rather than discovering surprises mid-project.
Our Main Simi Valley Services
Simi Valley homeowners reach out to us most often for home additions, garage conversions, and full ADU builds. Each one works differently on a Simi Valley lot, and each has its own page with pricing and specifics.
Home Addition Contractor in Simi Valley
Adding square footage to an existing Simi Valley home usually means extending into the side or rear yard, or building up on homes with flat enough roofs to support it. We handle foundation matching, roof tie-ins, and the mechanical work that keeps your new space heated and cooled through hot summers and cool winters. Older homes here often need electrical panel upgrades before a large addition can pass inspection. If you’re planning a primary suite, a family room extension, or an extra bedroom, Home Addition Contractor in Simi Valley covers what to expect and what it costs.
Garage Conversion Contractor in Simi Valley
A garage conversion, or turning attached or detached garage space into livable square footage, is one of the fastest ways to add a rental unit or in-law suite on a Simi Valley lot. Many garages here were built in the 1970s and 1980s, so we often address slab leveling, door header reinforcement, and adding insulation before finishing walls. Parking replacement requirements depend on your lot and ADU classification. For a full price breakdown and what the city needs from you, Garage Conversion Contractor in Simi Valley has the details.
ADU Builders in Simi Valley
A detached ADU, or accessory dwelling unit, is a separate small home built in the backyard of a property that already has a main house. In Simi Valley, we see a lot of parents adding units for adult children and owners building rentals for long-term tenants. The work includes site prep, foundation, utility runs from the main house, framing, and all interior finishes. Whether you build panelized or site-built, ADU Builders in Simi Valley walks through the full process, from first measurements to move-in.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Brands We Service in Simi Valley
We work hands-on with prefab ADU manufacturers like Abodu, Cover, and Dvele. Simi Valley homeowners who want a faster build often choose a prefab shell, and we handle the site work, foundation, and finish so it fits your lot and passes local inspection. See our brands for more on how we match the right system to your property.
Pricing for ADU Company in Simi Valley, CA
| Service | Typical range in Simi Valley |
|---|---|
| Detached ADU (site-built, 400 – 800 sq ft) | $180,000 – $320,000 |
| Detached ADU (prefab, 400 – 800 sq ft) | $150,000 – $260,000 |
| Garage conversion (attached, 400 – 600 sq ft) | $90,000 – $160,000 |
| Garage conversion (detached, 400 – 600 sq ft) | $110,000 – $190,000 |
| Home addition (400 – 800 sq ft) | $140,000 – $280,000 |
| Home addition (800 – 1,200 sq ft) | $260,000 – $420,000 |
| JADU (junior ADU, attached, under 500 sq ft) | $70,000 – $130,000 |
| Electrical panel upgrade to support ADU | $3,500 – $7,500 |
| Foundation and grading for slope-side lots | $15,000 – $45,000 |
| Utility trenching and hookups from main house | $8,000 – $25,000 |
Sloped lots, big tree removals, and long utility runs from the street push Simi Valley pricing toward the top of these ranges. You’ll always get a written price before any work starts, and that number doesn’t change at the door.
Neighborhoods We Serve in Simi Valley
We work across the full spread of Simi Valley, from the older grid neighborhoods near the 118 to hillside communities on the northern and eastern edges. A few of the areas where we regularly schedule builds and conversions:
- Central Simi Valley, including neighborhoods off Royal Avenue and Alamo Street
- East Simi Valley near Erringer Road and the Ronald Reagan Freeway corridor
- West Simi Valley, including the Madera and Wood Ranch area
- Hillside communities in the north and east, including Big Sky and Bridle Path
- Areas around Sycamore Drive and Cochran Street, with older ranch homes on larger lots
Our crews coordinate scheduling from the brand’s Los Angeles office and serve Simi Valley locally, so you’ll typically get on-site measurements within a week of your call.
Service Area – Cities Near Simi Valley
While this page covers Simi Valley specifically, our crews also take on ADU and addition work in a few surrounding communities. If you’re just over the line, we may serve your area: Moorpark, CA, Newbury Park, CA, Fillmore, CA, and Somis, CA all fall within our service area. Give us a call and we’ll confirm coverage for your street.
Serving Simi Valley, CA - Our Local Coverage Area
We’re based in the Simi Valley area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs About ADU Company in Simi Valley
After your call, we schedule a site visit and measurements typically within a week. Permitting in Simi Valley usually takes two to four months depending on plan review volume, and construction starts once the permit is issued. The full answer depends on your lot, but you’ll know the schedule before you sign anything.
Some Simi Valley neighborhoods have HOA design review, and we check that before we start. California state law limits what HOAs can restrict on ADUs, but some still require architectural review for colors, rooflines, and landscape screening. Call (831) 230-7250 and we’ll help you figure out what applies to your property.
No. Every Lodgewick project starts with a written price, and that number holds unless you request a change in scope. If site conditions force a change, we put it in writing before any extra work happens. Call (831) 230-7250 for a free estimate and a quote that means what it says.
What happens when you call
- 1A real person answersNo phone trees - talk to a local adu pro.
- 2You get an upfront price rangeHonest numbers before anyone is dispatched. No surprises.
- 3We come out and measureLicensed & insured, at a time that suits you - the visit and the quote are both free.
- 4You get the price in writingLine-itemed, yours to keep, and nothing starts until you say go.
What Simi Valley Customers Say
"Turned our detached garage into a little guest house. Clean crew, respectful of the neighbors, and no mystery charges at the end. Love how it turned out."
- Carmela Fontes"Converted our garage into a rental studio. The crew was respectful of the neighbors and kept the site clean. It's bringing in rent now and paid for itself faster than I expected."
- Grace Yoon"The ADU came out beautiful and the permitting, which terrified me, was handled start to finish. They kept me updated every week so I was never wondering what was happening."
- Shauna Mills
