ADU Company in Westminster, CA
Most ADU work in Westminster means converting a 1950s – 1970s garage or building a compact freestanding unit behind a ranch home, and it comes with a specific set of Westminster realities: 100-amp electrical panels that likely need upgrading, older sewer laterals the city inspects closely, and a marine-layer climate that makes vapor barrier detailing more important here than in drier parts of Orange County. We’re Lodgewick ADU Builders, part of the Kingswell family, and our Westminster work centers on accessory dwelling units, garage conversions, and home additions, all under a written price and a written guarantee before any work starts. Call (254) 602-5618 to get your project priced.
Why Westminster Homes Are Different
Westminster’s residential streets, particularly the blocks north and south of Bolsa Avenue, are built around a housing stock that no longer matches how people live. Most homes are single-story ranch layouts from the 1950s through the 1970s, sitting on 6,000 to 7,500 square foot lots. The attached or detached two-car garage was built for parked cars and a water heater, and today it’s the most common ADU conversion target in the city. That age of construction brings three recurring conditions we plan for on nearly every Westminster estimate: 100-amp electrical panels that must be upgraded to 200-amp for ADU compliance, possible asbestos in vinyl floor tiles and popcorn ceilings, and cast-iron or clay sewer laterals that Westminster’s inspectors increasingly flag during permit review.
Westminster sits five to seven miles inland from the Pacific, which means the morning marine layer shows up most of the year. The practical effect for a garage conversion is moisture. We add more careful vapor barrier and ventilation detailing on converted slabs in Westminster than we would for the same job in, say, Fountain Valley, if for no other reason than a slab that stays damp breeds must and failing flooring inside three years. None of this is exotic. It’s just the local version of doing the job once.
Our Main Westminster Services
Most Westminster homeowners who call us are weighing three paths to more space, and each one has its own dedicated page with pricing and Westminster-specific details.
Home Addition Contractor in Westminster
A home addition in Westminster usually means building out from the back of a ranch home rather than up, since most of these lots have room behind the house and single-story construction keeps the permit path simpler. The Westminster version of this job typically involves matching 1960s rooflines, confirming the existing foundation can carry the new load, and coordinating with the city on setback requirements for the specific lot. We handle the permit drawings, the structural work, and the finish details under one written price. Home Addition Contractor in Westminster covers the full scope and Westminster pricing.
Garage Conversion Contractor in Westminster
Garage conversions are the dominant ADU type in Westminster because the existing two-car garage already has a foundation, framing, and a roofline; the work becomes a matter of enclosing, insulating, and finishing. The Westminster-specific concerns are the 100-amp panel upgrade, the sewer lateral inspection, and the vapor barrier under a slab that sees coastal moisture year-round. We price the entire conversion up front, including permits, electrical, plumbing, drywall, and finish. Garage Conversion Contractor in Westminster walks through the numbers.
ADU Builders in Westminster
New detached ADUs in Westminster are typically 400 to 1,200 square feet, built in the rear yard of a lot that already holds a 1960s ranch. On blocks around the Little Saigon corridor, most clients want a private exterior entrance and a full kitchen even in a compact unit; that expectation of household independence is a Westminster standard, not an upsell. We match each project to the right construction approach, from stick-built to prefab systems from manufacturers like Abodu and Cover. ADU Builders in Westminster details the options and price ranges.
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 Westminster
Westminster projects work well with specific ADU and cladding brands. We regularly specify James Hardie siding for its performance in coastal moisture, and Abodu and Cover prefab units for rear-yard detached ADUs where speed and a fixed factory price matter. See our brands page for the full list and how we match each one to a lot and budget.
Pricing for ADU Company in Westminster, CA
| Service | Typical range in Westminster |
|---|---|
| Garage conversion to studio ADU | $90,000 – $140,000 |
| Garage conversion to 1-bedroom ADU | $110,000 – $165,000 |
| Garage conversion to 2-bedroom ADU | $140,000 – $200,000 |
| Detached ADU (400 – 600 sq ft) | $120,000 – $180,000 |
| Detached ADU (600 – 900 sq ft) | $170,000 – $260,000 |
| Detached ADU (900 – 1,200 sq ft) | $240,000 – $340,000 |
| Prefab ADU, factory-built | $100,000 – $250,000 installed |
| 200-amp electrical panel upgrade | $3,500 – $6,500 |
| Sewer lateral replacement | $4,000 – $12,000 |
| Home addition (400 – 800 sq ft) | $140,000 – $260,000 |
The two things that push a Westminster ADU price past the top of these ranges are sewer lateral replacement and hidden asbestos removal, both of which we identify during the written estimate, not after demolition starts. Every Westminster project gets a written price before work begins, and that price does not change at the door.
Neighborhoods We Serve in Westminster
Our Westminster crews cover the full city, from the Bolsa Avenue corridor north and south through the residential blocks to the neighborhoods along Westminster Boulevard and the 405’s west side.
- Little Saigon / Bolsa Avenue corridor
- North Westminster
- East Westminster near the 405
- Westminster Boulevard area
- Village Center area
Response time across Westminster is typically one business day for the written estimate; scheduling for the work itself depends on the project size and permit path.
Service Area – Cities Near Westminster
We serve Westminster plus the surrounding Orange County communities, including Midway City, CA directly to the north, Stanton, CA to the northeast, Fountain Valley, CA to the southeast, and Huntington Beach, CA along the coast to the south. Scheduling and dispatch for Westminster projects are coordinated from our Los Angeles office, with local crews serving the city directly.
Serving Westminster, CA - Our Local Coverage Area
We’re based in the Westminster 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 Westminster
Most Westminster ADU projects move from signed estimate to permit submittal within two to three weeks, assuming the lot has no major title or survey complications. Permit review times at the city vary; we handle the submittal and any plan corrections.
City code requires an efficiency kitchen in most ADUs, but in Westminster’s Little Saigon neighborhoods, clients almost universally want a full kitchen and a private exterior entrance for multigenerational households. We build that as the baseline where clients request it, not as an upgrade.
No. Our written price is the price. If we find an unforeseen condition like a failing sewer lateral during demolition, we stop, document it, and bring you a written change order for approval before any additional work proceeds. Call (254) 602-5618 to schedule your free estimate.
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 Westminster Customers Say
"Garage conversion into an office and guest room. Fair written price, finished close to on schedule, and they fixed a small drywall crack under warranty months later without any hassle."
- Diana Cho"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"A whole backyard ADU from scratch. Terrified me going in, but they kept me updated weekly and there were no nasty surprises. Quality work and a fair price."
- Noreen Fletcher