ADU Company in Brea — Plans, Permits & Build, One Fixed Price

We handle the design, the engineering, and the city permit, then build it. One contract, one crew, one accountable point of contact. Free feasibility check on your lot before you commit.

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ADU Company in Brea, CA

Kitchen remodeling in Brea usually means working inside homes built between 1955 and 1970, which brings a specific set of conditions: original footprint layouts, load-bearing walls where today’s buyers want open sightlines, and 100-amp electrical panels that were never sized for a modern kitchen. We’re Westminster ADU Builders, and we’ve served Brea homeowners since 2016. Our kitchen work centers on reconfiguring ranch-era floor plans, upgrading service panels as part of the job, and spec’ing finishes that hold up through Brea’s hot inland summers and dry Santa Ana winds. Call (833) 620-3521 to talk through your project.

Call (833) 620-3521

Why Brea Homes Are Different

The 92821 flatlands are full of post-war tract ranches on bigger lots than you’d find in Fullerton or Placentia. Most still have their original single-wall kitchens, and a high number sit on slab foundations, which means moving a sink or gas line involves saw-cutting concrete rather than crawling a crawlspace. That’s not a dealbreaker, but it changes sequencing and cost. Up in 92823, Blackstone and the hillside tracts north of Lambert are newer two-story homes, often HOA-governed, where design review and noise windows matter more than foundation type. Brea also sits in the Santa Ana Canyon wind corridor, so vent placement, range hood makeup air, and operable window specs get more attention here than in coastal cities. A kitchen that vents poorly in Brea fills the house with cooking heat during a September Santa Ana.

Our Main Brea Services

Most Brea homeowners call us for one of two things: building an ADU on a lot that can actually support one, or remodeling a bathroom inside a home that’s due for it. Both have their own dedicated Brea pages.

ADU Builders in Brea

Brea’s flatland ranch lots in 92821 are among the best ADU candidates in north Orange County. Deep back yards, rear alleys, and detached garages from the 1950s and 60s mean detached ADUs and garage conversions are genuinely feasible, not just possible on paper. The catch is what’s under those old garages: slabs without proper footings, which turns a “simple” conversion into a foundation project. Hillside lots in 92823 face a different set of rules under Brea’s Hillside Development Ordinance, where slope and drainage review can add months. We walk every Brea client through both paths before any design gets locked. ADU Builders in Brea covers the full breakdown.

ADU Builders in Brea

Bathroom Remodeling in Brea

Brea’s original ranch homes typically have one full bath for three bedrooms, and homeowners hit a wall when two generations try to share it. Moving a bathroom wall in a slab-on-grade Brea house means cutting concrete for drain lines, so we sequence that work carefully to avoid tearing up more floor than necessary. In newer 92823 homes, the constraint is usually HOA review for any window or vent changes. We handle the full remodel in-house, from waterproofing and tile to fixtures and lighting, so you’re not juggling three different trades. Bathroom Remodeling in Brea has specifics and pricing.

Bathroom Remodeling in Brea
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What happens when you call

  1. 1
    A real person answersNo phone trees — you reach a local pro.
  2. 2
    You get an upfront price rangeHonest numbers before anyone is dispatched.
  3. 3
    A background-checked tech heads outLicensed & insured, dispatched right away.
  4. 4
    You approve before work beginsNothing starts until you say go.

Kitchen Remodeling in Brea

Brea kitchen remodeling is defined by the housing stock: 1950s and early-60s ranch kitchens in 92821 were built as closed-off rooms with a single wall of cabinets, an electric range, and a panel that struggles with today’s appliance loads. The job here usually means opening a load-bearing wall, upgrading to a 200-amp panel, and reworking a slab foundation to move plumbing. Inland heat means we spec range hoods with real CFM and windows sized for cross-ventilation, because Brea summers run hotter than anything coastal. We handle kitchens as part of our broader Kitchen Remodeling work, and we bring the same approach to Brea’s hillside homes in 92823, where HOA design review often shapes what’s possible.

Full kitchen reconfiguration

Signs you need it

Your Brea ranch kitchen is closed off from the living area, you’re working with one narrow counter run, and the layout can’t support two people cooking at once.

What it costs in Brea

A full Brea kitchen reconfiguration typically runs $45,000 to $75,000, including the structural work, panel upgrade, cabinets, counters, flooring, and finishes.

How we do it

We start with the load-bearing wall assessment and foundation plan, pull Brea permits with structural drawings, then sequence demo, plumbing and electrical rough-in, drywall, cabinets, counters, and finish work in a single contract.

Cabinet and counter replacement

Signs you need it

Your cabinet boxes are sound but doors are worn, drawer slides are failing, and counters are original laminate that’s delaminating at the seams.

What it costs in Brea

Cabinet and counter replacement in Brea typically lands between $15,000 and $30,000 depending on cabinet line, counter material, and whether you’re keeping the existing layout.

How we do it

We confirm your existing cabinet footprint works, order doors or full boxes to spec, and install new counters with plumbing disconnects and reconnects for sink and fixtures under one scope.

What Kitchen Remodeling Costs in Brea

Item Typical range in Brea
Full kitchen reconfiguration $45,000 – $75,000
Cabinet and counter replacement $15,000 – $30,000
Panel upgrade to 200 amps $3,500 – $5,500

Do I need a permit for a kitchen remodel in Brea?

Yes, if you’re moving plumbing, electrical, or structural walls, Brea requires permits. A cabinet-only refresh often doesn’t, but any wall removal or panel work does. Call (833) 620-3521 and we’ll tell you what your scope triggers before you commit.

Will my Brea kitchen remodel price change once work starts?

Not unless you change the scope. We write fixed-price quotes after plans are set, and Brea slab foundations occasionally reveal surprises, but we flag those before touching them. Call (833) 620-3521 for a detailed line-item estimate.

Brands We Service in Brea

For Brea ADU projects, we work with Cover, Dvele, and Mighty Buildings on the prefab side, and we carry James Hardie fiber-cement siding knowledge for exteriors that stand up to Santa Ana winds and hillside ember exposure. See our brands for the full roster and turnaround specifics.

Pricing for ADU Company in Brea, CA

Service Typical range in Brea
Full kitchen reconfiguration $45,000 – $75,000
Cabinet and counter replacement $15,000 – $30,000
Kitchen panel upgrade to 200 amps $3,500 – $5,500
Detached ADU (prefab, flatland 92821) $180,000 – $280,000
Detached ADU (site-built, flatland 92821) $220,000 – $350,000
Garage conversion ADU (flatland 92821) $120,000 – $180,000
Hillside ADU (92823, slope/drainage review) $300,000 – $450,000+
Bathroom remodel (guest/hall, ranch home) $18,000 – $30,000
Bathroom remodel (primary, expanded footprint) $30,000 – $55,000

What pushes Brea prices up is slab cutting for plumbing moves, panel upgrades on 100-amp ranches, and hillside grading and drainage work in 92823. We give every Brea homeowner a fixed, line-item quote before work starts, and we don’t write change orders unless you change the scope.

Neighborhoods We Serve in Brea

We work across Brea’s flatland tracts north of Imperial Highway and the hillside zones up toward Lambert and Carbon Canyon. Most of our kitchen and ADU work happens in the 92821 ranch neighborhoods, with a steady share in the newer 92823 communities. Typical response time for an estimate in Brea is within one to two business days depending on where you are.

  • Country Hills (92821)
  • Laurel (92823)
  • Blackstone (92823)
  • Downtown Brea / Brea Boulevard corridor (92821)
  • North Hills / Lambert area (92823)

Service Area – Cities Near Brea

Westminster ADU Builders works throughout north Orange County, so if you’re just over the Brea line, we’ve got you covered. We regularly take on projects in Placentia, CA, Fullerton, CA, Yorba Linda, CA, and La Habra, CA. Same team, same fixed-price approach.

Serving Brea, CA — Our Local Coverage Area

We’re based in the Brea 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 Brea

Ready to get started? Free estimates · Free on-site estimates response in Brea
Call (833) 620-3521

What happens when you call

  1. 1
    A real person answersNo phone trees — talk to a local adu pro.
  2. 2
    You get an upfront price rangeHonest numbers before anyone is dispatched. No surprises.
  3. 3
    We come out and measureLicensed & insured, at a time that suits you — the visit and the quote are both free.
  4. 4
    You get the price in writingLine-itemed, yours to keep, and nothing starts until you say go.

What Brea Customers Say

★★★★★ 5.0 from 4+ reviews

"He gave us a realistic rental number for the finished unit rather than the optimistic one, and it's renting for about what he said."

— Erin Quinn

"The kitchenette layout he suggested made better use of the space than the one on our original sketch."

— Lisa Hayes

"Knew the local setback and parking rules cold, which saved us from designing something that would never have been approved."

— Daniel Norris

How It Works in Brea

Getting your adu handled is simple and fast.

1

Call or Request a Free Estimate

Tell us about your adu needs and we provide an upfront, transparent quote — no obligation, no hidden fees.

2

Licensed Technician Dispatched

A background-checked, certified technician arrives in Brea — typically within 30–60 minutes, with parts stocked on the truck.

3

Problem Solved, Guaranteed

We complete the job to your full satisfaction, backed by our warranty and 100% satisfaction guarantee.

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