A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateADU Company in La Mirada, CA
La Mirada homeowners add ADUs and additions for the same three reasons anywhere in Los Angeles County does: family, rental income, or workspace. What changes here is the housing stock. Most of La Mirada’s single-family homes were built between the mid-1950s and early 1970s, which means flat-to-low-pitch roofs, slab foundations, and side yards that are wider than the standard 5-foot setback found in denser cities like Norwalk or Cerritos. Those three conditions shape every estimate we write in La Mirada. Call (903) 568-7222 and we’ll walk the property with you, measure the actual setback, and put a written price in your hand before anything gets drawn.
Why La Mirada Homes Are Different
La Mirada lots tend to run deep and fairly wide on the older streets north of Imperial Highway, especially in neighborhoods like the Creek Park area and the tract blocks around Foster Road and Santa Gertrudes Avenue. That extra depth matters for detached ADUs because it means a backyard unit does not have to butt against the rear property line the way it often does on tighter Cerritos lots. We still check every setback against current city code, but the site work usually comes down to utility trenching and a compacted gravel base rather than major grading.
The other factor is the soil. La Mirada sits in the northern part of the Los Angeles basin, and while most of the city is not in a liquefaction zone, portions near La Mirada Creek and the hillsides below La Mirada Regional Park have expansive clay that swells and shrinks through wet winters and hot summers. We specify deeper footings or a compacted aggregate base on those sites, and we show that cost as a line item in the written price. No surprises later, because the soils report is in front of you before you sign.
Our Main La Mirada Services
Most La Mirada calls start with one of two things: a detached backyard ADU for rental income or a new primary suite for growing families. We handle both, plus smaller room additions, with the same written-price process from the first visit.
ADU Builders in La Mirada
A detached ADU in La Mirada usually lands in the backyard along the rear or side property line, and the wide older lots give us room to work without tearing up landscaping. We build both prefab panel units and site-built units, which means the timeline and the price can be matched to what you actually want: a faster Abodu-style panel build or a fully custom floor plan. Every ADU project includes a live tracking link, photos at the end of each workday, and a fixed price that does not change at the door. ADU Builders in La Mirada
Home Addition Contractor in La Mirada
Home additions here typically means expanding the kitchen or adding a family room onto the back of a 1960s ranch. The flat roof and slab foundation make tie-in work simpler than it is on raised foundations, but the existing roofline has to be inspected before we can spec the new framing. We handle permits, structural engineering, and the build itself. You get a line-item price for every stage, and if something is not right within a full year, we come back and make it right under the 365-Day Done Right Promise. Home Addition Contractor in La Mirada
Room Addition Contractor in La Mirada
A room addition works well on La Mirada’s wider side yards, where a 200-to-400-square-foot bedroom or office can go up without touching the main living area. Most of these are done as a bedroom-plus-bath or a home office with a separate entrance, and we run the plumbing and electrical through the existing slab rather than trenching around the house. We keep the price fixed, and every technician who shows up on your property is background-checked and in uniform. Room Addition Contractor in La Mirada
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 La Mirada
We build with prefab and material brands you can research before you commit: Abodu, Cover, Dvele, and Mighty Buildings. Parts and panels are ordered directly through each brand’s local channel, and we walk you through the differences in lead time and panel finish. See our brands for the full rundown.
Pricing for ADU Company in La Mirada, CA
| Service | Typical range in La Mirada |
|---|---|
| Detached ADU (prefab panel, 400 – 600 sq ft) | $180,000 – $265,000 |
| Detached ADU (site-built, 400 – 600 sq ft) | $220,000 – $310,000 |
| Detached ADU (site-built, 600 – 900 sq ft) | $290,000 – $395,000 |
| Garage conversion ADU (400 – 500 sq ft) | $110,000 – $170,000 |
| Attached JADU (300 – 500 sq ft) | $95,000 – $145,000 |
| Home addition (kitchen expansion, 150 – 250 sq ft) | $90,000 – $150,000 |
| Home addition (primary suite, 300 – 400 sq ft) | $130,000 – $200,000 |
| Room addition (bedroom or office, 200 – 400 sq ft) | $75,000 – $135,000 |
| Room addition with full bathroom | $95,000 – $160,000 |
| Site work, permits, and utility connections | $15,000 – $35,000 |
Prices in La Mirada get pushed upward by expansive clay soils that need deeper footings, older electrical panels that need a service upgrade before the ADU can be connected, and rear-yard access that requires a temporary construction gate. Those costs show up as line items on your written price before work starts, not as change orders halfway through.
Neighborhoods We Serve in La Mirada
We work all over La Mirada, from the older tract homes around Foster Road and Santa Gertrudes Avenue to the Creek Park neighborhood, the streets surrounding La Mirada Regional Park, and the newer subdivisions near Biola University.
- Creek Park area
- Foster Road / Santa Gertrudes Avenue tracts
- Homes surrounding La Mirada Regional Park
- Neighborhoods near Biola University
- The Imperial Highway corridor
Most La Mirada estimates and site visits are scheduled within a day or two of your call, and we send a live arrival time before the technician shows up.
Service Area – Cities Near La Mirada
Benson ADU Builders serves La Mirada and the surrounding Los Angeles county communities. Dispatch and scheduling are coordinated from our Los Angeles office, and crews serve La Mirada locally. We also cover La Habra, CA, Norwalk, CA, Santa Fe Springs, CA, and Cerritos, CA.
Serving La Mirada, CA - Our Local Coverage Area
We’re based in the La Mirada 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 La Mirada
Most La Mirada homeowners get an estimate visit within one to two business days of calling (903) 568-7222. We’ll give you a live arrival time in the morning so you know when we’re coming, and the written price is prepared after the site walk, not before we’ve seen the property.
Some La Mirada neighborhoods have active HOAs with their own rules about ADU placement, height, and exterior finishes. California law limits what an HOA can prohibit, but it’s worth checking your community’s covenants before finalizing a design. We’ll help you identify what applies to your block and build that into the estimate timeline. Call us for exact details on your street.
Yes. We handle the city permits, structural drawings, utility connections, and final inspection on every ADU, home addition, and room addition we build in La Mirada. You’ll see the permit status in your project tracking link, and you’ll get a final walkthrough before we call the job done. Call (903) 568-7222 to get your free estimate started.
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 La Mirada Customers Say
"Booked a consult online and met the project manager two days later. Weekly progress updates arrived by text with photos. ADU finished on schedule."
- Hannah W."Clean, quiet crew. They respected the neighbors, kept noise to working hours, and swept the driveway every evening."
- Hope C."Communication was the best part. I always knew what was happening that week without having to ask."
- Dolly N.
