A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateADU Company in Hacienda Heights, CA
Adding an ADU or home addition in Hacienda Heights means working with hillside lots, older 1950s-to-1970s housing stock, and unincorporated Los Angeles County permitting. Sutton ADU Builders handles the planning, the paperwork, and the build itself, with a written price locked in before any work starts and a 365-Day Done Right Promise on completed work. If you’re weighing a detached ADU, a garage conversion, or a room addition, call (472) 248-8213 for a free estimate and we’ll walk you through what your specific lot can support.
Why Hacienda Heights Homes Are Different
Hacienda Heights sits on a series of rolling hills between the San Gabriel Valley and Puente Hills, and that terrain shapes almost every project. Many homes along the northern edge of the city and through the neighborhoods off of Colima Road are built on slopes, which means foundation work, drainage, and retaining walls become part of the conversation before a new structure ever gets framed. A flat lot in the southern section of Hacienda Heights near the 60 freeway is a very different job from a hillside lot up near Skyline Drive, and the difference shows up in the grading and foundation numbers.
The housing stock here is mostly single-family homes built between the 1950s and 1970s, though some pockets were developed later. That age matters for additions: electrical panels in older Hacienda Heights homes often need an upgrade before a new ADU or room addition can tie in, and some of the original foundation work was done to codes that have since changed. Because Hacienda Heights is unincorporated, permits go through Los Angeles County Department of Regional Planning, which has its own ADU checklist. We file those permits as part of the job so you don’t have to learn county processes on the fly.
Our Main Hacienda Heights Services
The three projects homeowners ask about most in Hacienda Heights are home additions, ADUs, and room additions. Each one has its own page with pricing, the permit path, and what to expect on your property.
Home Addition Contractor in Hacienda Heights
A home addition in Hacienda Heights often solves the problem of a house that was sized for a 1970s family and is now expected to hold a home office, an aging parent, or adult children. We plan additions that match the existing roofline and exterior so the new space looks like it was always there, even on hillside lots where tying new construction into an old foundation takes real care. Drainage is the recurring theme on sloped Hacienda Heights properties. Read the full breakdown here: Home Addition Contractor in Hacienda Heights.
ADU Builders in Hacienda Heights
ADUs are a natural fit in Hacienda Heights because so many lots are generously sized by Los Angeles standards, leaving room for a detached unit in the rear yard or a garage conversion without sacrificing the whole backyard. Hillside lots raise questions about setbacks, access for construction equipment, and how utilities get from the main house to the new unit, and we answer all of them in writing before you commit. Get the full Hacienda Heights ADU details here: ADU Builders in Hacienda Heights.
Room Addition Contractor in Hacienda Heights
A single room addition, like a new bedroom or an expanded kitchen, is often the fastest way to add square footage in Hacienda Heights without a full ADU permit path. These projects work well on the older, standard-lot homes closer to Hacienda Boulevard and Gale Avenue, where the footprint is predictable and the biggest variable is usually how the existing electrical panel handles the added load. Learn what a room addition costs and how the permit process works here: Room Addition Contractor in Hacienda Heights.
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 Hacienda Heights
We install and service ADUs from Abodu, Cover, and Dvele, plus James Hardie exterior systems for additions in Hacienda Heights. Components for these product lines are stocked at our regional supply points, so most replacement parts arrive within a few business days. See our brands for the full list and what we recommend for different lot types.
Pricing for ADU Company in Hacienda Heights, CA
| Service | Typical range in Hacienda Heights |
|---|---|
| Detached ADU, 450 – 600 sq ft | $180,000 – $260,000 |
| Detached ADU, 600 – 800 sq ft | $240,000 – $320,000 |
| Detached ADU, 800 – 1,000 sq ft | $290,000 – $380,000 |
| Garage conversion ADU, under 400 sq ft | $95,000 – $150,000 |
| Garage conversion ADU, 400 – 600 sq ft | $130,000 – $190,000 |
| Above-garage ADU | $210,000 – $310,000 |
| Attached ADU (junior ADU or attached conversion) | $110,000 – $190,000 |
| Home addition, 300 – 500 sq ft | $90,000 – $160,000 |
| Home addition, 500 – 800 sq ft | $140,000 – $240,000 |
| Primary suite addition | $120,000 – $210,000 |
| Prefab ADU (Abodu, Cover, or Dvele), full install | $160,000 – $300,000 |
| Site work, grading, and utility connections (add-on) | $15,000 – $55,000 |
Hillside lots in Hacienda Heights tend to push pricing toward the upper end because grading, retaining work, and foundation engineering carry real cost. The written price you receive before work begins includes everything we can see, and we don’t hand you a change order later without a signed agreement first.
Neighborhoods We Serve in Hacienda Heights
We work throughout Hacienda Heights, from the hillside streets near the Puente Hills Preserve to the flatter blocks south of Colima Road. Most estimates can be scheduled within a few business days, and we plan each visit around your availability, not the other way around.
- North Hacienda Heights, near Skyline Drive and the hills
- Central Hacienda Heights, around Colima Road and Hacienda Boulevard
- South Hacienda Heights, near the 60 freeway corridor
- The neighborhoods along Gale Avenue and Stimson Avenue
- Hillside streets east of Seventh Avenue
Service Area – Cities Near Hacienda Heights
Sutton ADU Builders serves Hacienda Heights and the surrounding San Gabriel Valley communities. If you’re just outside our local area, you may find your city here: La Puente, CA, Rowland Heights, CA, Whittier, CA, and La Habra, CA.
Serving Hacienda Heights, CA - Our Local Coverage Area
We’re based in the Hacienda Heights 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 Hacienda Heights
Planning and design typically take three to six weeks, followed by Los Angeles County permit review, which generally runs two to four months for a detached ADU in Hacienda Heights. Garage conversions can move faster because the structure already exists. Call (472) 248-8213 and we’ll give you a realistic timeline for your lot.
Some Hacienda Heights neighborhoods have active HOAs with their own architectural review rules, but California state law limits how far an HOA can go in blocking an ADU outright. We review the specific HOA requirements before design so you know exactly what the board will approve.
Yes. Since Hacienda Heights is unincorporated, permits go through Los Angeles County, not a city building department. We prepare the plans, submit the permit application, and manage the county inspections through final sign-off, so you never have to chase paperwork yourself.
Not unless the scope changes and you approve it in writing first. We give you a written price before any work begins, and we don’t add line items without your sign-off. If site conditions reveal something we genuinely couldn’t see, we bring it to you with a specific number before proceeding.
Every Sutton ADU Builders technician is background-checked, identity-verified, uniformed, and photo-badged under the Threshold Verified standard. Before anyone arrives at your Hacienda Heights home, we send you their name and photo. They’ll show a photo ID badge at the door, every time.
If you’re ready to talk numbers, call (472) 248-8213. We’ll schedule a free estimate, walk your Hacienda Heights lot with you, and put the numbers in writing before you decide anything.
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 Hacienda Heights Customers Say
"Every crew member was vetted and carried a badge, which matters when they are around your family for months. Tidy site every day."
- Daniel F."Itemized estimate with allowances laid out. Final cost was within a hair of the quote."
- Naomi R."Backyard ADU for my mother. The project manager showed ID and walked me through the permit steps, the foundation plan, and the schedule. Moved her in on time."
- Margaret C.
