A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateADU Company in Alhambra, CA
ADU construction in Alhambra follows a rhythm all its own: mid-century ranches on 6,000-square-foot lots, Spanish Revival homes with deep rear yards, and gentle slopes along streets like Almansor and Mission that make foundation work a real planning exercise. We’re Benson ADU Builders, and we handle accessory dwelling units, home additions, and room additions across every Alhambra ZIP. If you’re weighing a detached unit behind a 1920s bungalow or converting a garage off Fremont Avenue, call (903) 568-7222 and we’ll walk you through what’s realistic on your specific lot.
Why Alhambra Homes Are Different
Alhambra’s housing stock clusters around a few distinct eras. The neighborhoods north of Main Street hold Spanish Colonial and Craftsman homes from the 1910s through the 1930s, many with detached garages set at the rear lot line. Those garages become ADU candidates fast, but the setbacks along narrow alley-access lots need careful measuring. South of the 10, you’ll find post-war tract ranches with wide but shallow lots, where a side-yard addition often pencils out better than a rear unit. In the hills around Emery Park and the streets climbing toward Story Park, slope and drainage dictate foundation type, and we see more pier-and-grade-beam work there than anywhere else in the city.
Alhambra sits in a mild Mediterranean climate, which helps on two fronts: roofing and stucco work can proceed year-round, and prefab panel deliveries don’t face weather windows the way they might in wetter regions. But the city’s older sewer laterals and narrow driveways mean we always check utility access before finalizing a floor plan. A detached ADU off a shared driveway needs a delivery path for panels or a crane strategy worked out early, not discovered on install day.
Our Main Alhambra Services
Most Alhambra homeowners reach out about one of three projects. Each has its own dedicated page, so you can go deep on pricing and process without wading through anything irrelevant.
ADU Builders in Alhambra
Detached and attached ADUs are the most common request we field across Alhambra, especially on those deep-lot pre-war properties where a rear unit doesn’t crowd the primary home. A typical Alhambra project involves a site visit to check setbacks and utility stub locations, then design work focused on your lot’s actual dimensions rather than a stock plan. We build with prefab brands like Abodu and Dvele when the access works, and site-built when a custom footprint makes more sense. Full details, including line-item pricing, live on the ADU Builders in Alhambra page.
Home Addition Contractor in Alhambra
When a growing family needs a second living area or a primary suite added to a mid-century ranch, the work usually means tying new foundation into existing slab while keeping the home livable. Alhambra’s post-war homes were built with consistent framing methods, which helps us match rooflines and stucco textures so the addition doesn’t read as an afterthought. We pull permits for every project and put the full price in writing before a single wall goes up. See the Home Addition Contractor in Alhambra page for the breakdown.
Room Addition Contractor in Alhambra
A single room added to a Alhambra home often costs less than a full ADU and can serve as an office, playroom, or guest space without triggering a separate utility setup. On the narrow lots typical south of Main Street, we frequently design bump-outs that extend the rear of the house rather than eating into side-yard setbacks. You’ll get the same written-price commitment and 365-Day Done Right Promise as any larger project. The Room Addition Contractor in Alhambra page covers square-footage ranges and what to expect.
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 Alhambra
We’re authorized to build with Abodu, Cover, and Dvele prefab systems, and we pair their panels with James Hardie cladding when the design calls for it. Panels and materials are ordered per project and staged at Alhambra job sites ahead of install day. For a closer look at what each brand offers, see our brands.
Pricing for ADU Company in Alhambra, CA
Ballpark numbers matter. Here’s what we typically see across Alhambra projects, based on the scope you’re considering.
| Service | Typical range in Alhambra |
|---|---|
| Detached ADU (studio, 400 – 500 sq ft) | $180,000 – $260,000 |
| Detached ADU (1-bedroom, 500 – 700 sq ft) | $220,000 – $320,000 |
| Detached ADU (2-bedroom, 700 – 1,000 sq ft) | $280,000 – $400,000 |
| Attached ADU (converted garage or wing) | $140,000 – $240,000 |
| JADU (interior conversion, up to 500 sq ft) | $90,000 – $150,000 |
| Home addition (single-story, 300 – 600 sq ft) | $120,000 – $220,000 |
| Home addition (two-story, 500 – 1,000 sq ft) | $220,000 – $380,000 |
| Room addition (single room, 150 – 300 sq ft) | $70,000 – $130,000 |
| Foundation work (slab on grade, per project) | $15,000 – $35,000 |
| Utility connections (sewer, water, power) | $10,000 – $25,000 |
Sloped lots in the Emery Park area and older sewer laterals near the city center can push the foundation and utility lines toward the upper end of those ranges. Every estimate we give in Alhambra is a written, line-item price before any work begins, so the number you approve is the number you pay.
Neighborhoods We Serve in Alhambra
We work throughout Alhambra, including the hillside streets above Almansor Park and the flatlands south of Valley Boulevard. A representative sample of the neighborhoods we regularly serve:
- Emery Park
- Midwick Tract
- North Alhambra (near the Alhambra Golf Course)
- Ramona Park area
- Story Park district
Permitting and site visits across these neighborhoods typically start within a few business days of your first call, depending on current scheduling.
Service Area – Cities Near Alhambra
Beyond Alhambra itself, we serve homeowners in South Pasadena, CA, San Marino, CA, Monterey Park, CA, and San Gabriel, CA. Scheduling is coordinated from our Los Angeles office, and crews serve Alhambra locally, so you’re never waiting on a team driving in from another county.
Serving Alhambra, CA - Our Local Coverage Area
We’re based in the Alhambra 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 Alhambra
Most Alhambra projects move from first consult to a written proposal within one to two weeks. Site visits are typically scheduled within a few business days. Call (903) 568-7222 and we’ll get you a specific date rather than a vague window.
Yes. We pull permits for every project and manage inspections through close-out. Alhambra’s planning process varies by project type, and we’ll tell you upfront what applies to your specific scope. The permit work is part of the written estimate, not a surprise line item later.
Your written price is fixed before work begins. If we find a condition that changes scope, we document it, show you photos, and get written approval before proceeding. No change orders appear billed after the fact. Call (903) 568-7222 for a free estimate on your Alhambra project.
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 Alhambra 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.
