A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateADU Company in Cerritos, CA
Fielding ADU Builders handles room additions, garage conversions, and backyard ADUs in Cerritos, CA, with a written price before any work starts and a one-year written guarantee on every project. Cerritos jobs differ from neighboring cities because of the housing stock: mid-century single-family homes on flat, rectangular lots with mature trees and, in many neighborhoods, active homeowners’ associations. We plan around those conditions from the first site visit. Call (361) 315-4177 to schedule a free estimate.
Why Cerritos Homes Are Different
Cerritos has a high concentration of single-family homes built between the 1950s and 1980s, and that age shows up in the framing, the electrical panels, and the way homes sit on their lots. Many residences around Cerritos, from the neighborhoods near Cerritos High School to the streets north of the Towne Center, sit on flat ground with modest setbacks, which means ADU placement is usually a question of lot coverage rules rather than slope or soil movement. The flat terrain helps on cost: less grading, fewer retaining walls, and simpler foundation work than hillside cities to the west.
What changes the job in Cerritos is the HOA layer. Large swaths of the city fall under association review, and while state ADU law limits what an HOA can prohibit, the review process still means paperwork and possibly design restrictions on height, siding color, and window placement. We handle that layer for you. Two other local realities matter: mature trees near property lines can affect footing placement, and older electrical services, which were sized for 1970s demand, need an upgrade before a kitchen-going ADU or room addition can pass inspection. We quote that as part of the job, not as a surprise later.
Our Main Cerritos Services
Most Cerritos homeowners call us for one of three jobs: adding a room, converting an existing garage into living space, or building a detached ADU in the backyard. Each service has its own Cerritos page with pricing and specifics.
Room Addition Contractor in Cerritos
A room addition in Cerritos means extending either the side or rear of a mid-century or 1980s home, tying into the existing roofline, and matching stucco or siding so the new work does not read as an afterthought. The flat lots help here, because access for equipment is straightforward and foundation work rarely requires engineered fill. What we watch closely is the existing electrical panel and the roof tie-in point, both common trouble spots on homes of this age. See our Room Addition Contractor in Cerritos page for local pricing and timelines.
Garage Conversion Contractor in Cerritos
Garage conversions are often the fastest ADU path in Cerritos because the structure already exists, which keeps framing and waterproofing costs down. The work involves removing the garage door, raising the floor to match the house, reworking the electrical and insulation, and pulling permits with the city. One Cerritos-specific note: many garages here share a single 20-amp circuit with the house, so a dedicated subpanel is usually part of the quote. Read the Garage Conversion Contractor in Cerritos page for full pricing.
ADU Builders in Cerritos
Detached ADUs in Cerritos work well because so many lots have the rear-yard depth to fit a 400 to 800 square foot unit without crowding the main home or violating side setbacks. We build both conventional stick-framed units and prefab platforms where the lot access and budget favor factory construction. The choice comes down to soil conditions, your target rent or use, and how quickly you need the unit. See ADU Builders in Cerritos for cost breakdowns by build method.
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 Cerritos
We work with James Hardie siding for conventional builds and with Abodu, Cover, and Dvele for prefab and modular ADUs in Cerritos. That means you are not locked into one construction method; you get the platform that fits your lot, budget, and timeline. See our brands page for more on what we service.
Pricing for ADU Company in Cerritos, CA
| Service | Typical range in Cerritos |
|---|---|
| Detached ADU (prefab, 400 – 600 sq ft) | $130,000 – $210,000 |
| Detached ADU (conventional build, 500 – 800 sq ft) | $180,000 – $310,000 |
| Above-garage ADU (Junior ADU) | $120,000 – $190,000 |
| Garage conversion (existing footprint) | $90,000 – $150,000 |
| Room addition (200 – 400 sq ft) | $65,000 – $145,000 |
| Primary suite addition (400 – 600 sq ft) | $110,000 – $190,000 |
| Second-story addition (partial) | $150,000 – $260,000 |
| Kitchen expansion (150 – 300 sq ft) | $55,000 – $120,000 |
| Prefab unit site prep and utility hookups | $18,000 – $35,000 |
| Electrical panel upgrade (200A) | $3,500 – $6,500 |
In Cerritos, HOA design review and older panel replacements are the two most common line items that push a bid above the base range, and we include them in the written price before work starts. The number you approve on day one is the number on the final invoice.
Neighborhoods We Serve in Cerritos
We cover the full Cerritos residential footprint. Response times for the first site visit run around three to five business days depending on where you are in the city.
- Shadow Park
- Westgate
- Cerritos Towne Center area
- Heritage Park neighborhoods
- Liberty Park
Service Area – Cities Near Cerritos
If you are just outside Cerritos, we also schedule free estimates in Artesia, CA, La Palma, CA, Hawaiian Gardens, CA, and Norwalk, CA. The same written price policy and one-year guarantee apply in every one of these cities.
Serving Cerritos, CA - Our Local Coverage Area
We’re based in the Cerritos 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 Cerritos
We schedule the first site visit within three to five business days for most Cerritos addresses. From that visit, you get a written estimate, and permit approval typically takes one to three months depending on HOA review and city workload. Call (361) 315-4177 to set the visit.
State law limits what an HOA can prohibit, but many Cerritos HOAs still require design review for exterior changes, colors, and window placement. We prepare and submit the review package so your ADU or addition moves through without a board rejection. We cannot guarantee an HOA outcome, but we know the Cerritos process.
Yes. The written price includes the full scope, and unless you add square footage or choose a finish upgrade after signing, the final invoice matches the day-one number. That is the Garrison Standard, and it is on paper before any work begins. Estimates are free at (361) 315-4177.
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 Cerritos Customers Say
"Room addition over the back patio. Framing is square, windows are tight, and the roofline matches."
- Danny L."Foundation and slab poured on schedule. Crew kept the yard orderly."
- Marian J."Garage conversion with a new bath and kitchenette. Permit was handled by them. Inspection passed first time."
- Sheila B.
