A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateADU Company in Montebello, CA
Adding an ADU in Montebello works differently than in most Los Angeles County cities. The R-1 zones here permit 1,200 square foot ADUs by right, which is far larger than what neighboring cities allow, and that changes the math on nearly every project we quote. Many of the post-war homes on the north and east sides sit on long, narrow lots with detached garages opened from alleys, so a garage conversion is often the fastest path to rentable square footage. We’re Fielding ADU Builders, the ADU and room-addition specialist inside the Garrison Partners family, and we put every Montebello price in writing before work begins. Call (626) 657-5541 for a free estimate.
Why Montebello Homes Are Different
Montebello’s housing stock is mostly single-story stucco and wood-frame construction from the 1940s and 1950s, with the older central streets holding Spanish Colonial Revival and Craftsman bungalows from the 1920s. Those older central homes present a different job than the post-war tract houses: foundation conditions vary block by block, and some garages are so structurally weak they need a full rebuild rather than a conversion. We see that regularly on streets north of Beverly Boulevard and east of Montebello Boulevard.
The climate shapes our ADU work too. Warm, dry summers mean a small backyard unit needs real cross-ventilation and shading from western exposure, or the afternoon heat turns it into a box that won’t cool down. Winter rain events, though occasional, can be heavy, so roof drainage and a flood-resistant foundation detail matter more than homeowners expect. And on the hilly south side, many homes have what locals call California basements: partially above-grade lower levels that a sharp contractor can count as non-habitable storage to keep an ADU under the city’s 16-foot height limit. That one detail has saved several Montebello projects from a variance hearing.
Our Main Montebello Services
Montebello homeowners call us most often about two things: adding living space to the main house and converting a detached garage into an ADU. Each service has its own Montebello page with local pricing and specifics.
Room Addition Contractor in Montebello
A room addition on a Montebello lot has to respect the shape of the land. On the north and east sides, long, narrow parcels push additions upward rather than outward, which is why second-story additions over existing single-story homes are common here. The city’s allowance for larger ADUs on compact R-1 lots also means some homeowners fold a room addition and an ADU into the same permit package, saving on plan-check fees and site mobilization. We handle the drawings, the structural work, the permits, and the finish. Room Addition Contractor in Montebello has the full breakdown.
Garage Conversion Contractor in Montebello
Montebello’s alley-loaded detached garages are the city’s quiet opportunity. Because the garage sits at the rear of a deep lot, converting it to an ADU leaves the main house and front yard untouched, and the alley access means tenants come and go without crossing the front door. The catch is condition: many 1940s and 1950s garages here were built on thin slabs with minimal framing, and a significant share need full structural replacement rather than a simple conversion. We tell you which one you have after the first site visit, and we put that in writing. Garage Conversion Contractor in Montebello covers the specifics.
ADU Builders in Montebello
Montebello’s ADU ordinance is unusually permissive. A 1,200 square foot detached ADU by right, on a compact post-war lot, is a real second house in the backyard, not a token studio. We build those conventionally with James Hardie siding where the lot allows, and we also work with prefab platforms like Abodu, Cover, and Dvele where factory-built speed and tighter cost control fit the project better. Alley access, setback rules, and the 16-foot height limit each shape the design. ADU Builders in Montebello walks through the options and local cost 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 Montebello
We build with the prefab and modular platforms Montebello homeowners are already researching, including Abodu, Cover, Dvele, and Mighty Buildings, alongside conventional builds with James Hardie siding and Tuff Shed-style structures. See our brands for the full list and what each method suits best.
Pricing for ADU Company in Montebello, CA
| Service | Typical range in Montebello |
|---|---|
| Garage conversion ADU (attached plan set and build) | $95,000 – $165,000 |
| Detached backyard ADU (conventional build) | $175,000 – $310,000 |
| Prefab/modular ADU (delivered and set) | $125,000 – $230,000 |
| Second-story addition over existing single-story home | $210,000 – $425,000 |
| Primary suite addition | $115,000 – $215,000 |
| Family room addition | $95,000 – $185,000 |
| Kitchen extension | $80,000 – $160,000 |
| Full garage rebuild plus conversion | $135,000 – $240,000 |
| Structural upgrade to existing garage before conversion | $15,000 – $45,000 |
| Permit and plan-set fees (city, structural, title 24) | $6,000 – $18,000 |
What pushes a Montebello ADU toward the top of these ranges is almost always the same three things: a garage that needs full structural replacement, a hillside lot on the south side that requires engineered retaining or drainage work, or a property where the alley easement triggers extra setback review. The price we hand you before work starts is the price on the final invoice. That is the Garrison Standard, and it is not negotiable.
Neighborhoods We Serve in Montebello
We work across Montebello, from the flat post-war tracts on the north side to the hillside streets below Montebello Country Club where the California basements and view lots live. Typical response time for a site visit anywhere in Montebello is within two to three business days.
- North Montebello (north of Beverly Boulevard)
- East Montebello (east of Montebello Boulevard)
- Central Montebello (1920s bungalow district)
- South Montebello hills (near Montebello Country Club)
- Montebello Gardens area
Service Area – Cities Near Montebello
Beyond Montebello, our crews cover the surrounding San Gabriel Valley and Gateway Cities. If you’re in Pico Rivera, CA, South El Monte, CA, Temple City, CA, or San Marino, CA, we can quote your ADU or addition with the same written-price-first process. Dispatch and scheduling are coordinated from the brand’s Los Angeles office; crews serve Montebello locally.
Serving Montebello, CA - Our Local Coverage Area
We’re based in the Montebello 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 Montebello
Site visits in Montebello are typically scheduled within two to three business days. After the estimate, the timeline depends on plan-set preparation and the city’s plan-check queue, which runs several weeks to a few months depending on project complexity. Call (626) 657-5541 to get your project in the queue.
State law limits what HOAs can do to block ADUs, but if your Montebello neighborhood has an HOA with recorded CC&Rs, you still need to file the required notice and follow their architectural review process. We handle that paperwork as part of the permit package. We will not surprise you with it later.
No. The price we put in writing before any work begins is the number on the final invoice. The only exception is a written change order you approve in advance for something you decide to add or upgrade. That is the Garrison Standard, and it applies to every Montebello job we take.
If you’re planning an ADU, garage conversion, or room addition in Montebello, call Fielding ADU Builders at (626) 657-5541 for a free estimate. Reed Calloway leads our team, and the number you approve on day one is the number you pay at the end.
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 Montebello Customers Say
"Insulation, drywall, and finishes were all well done. Feels like part of the house."
- Pete O."Room addition over the back patio. Framing is square, windows are tight, and the roofline matches."
- Danny L."Honest feedback on what the lot could fit. Told me up front what would fit on the lot and what the setbacks would allow."
- Rita C.
