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
Benson ADU Builders handles accessory dwelling units and home additions across Hacienda Heights from first sketch to final inspection. Most homes here sit on larger lots with sloped grades and older septic or sewer lines that change how we handle setbacks, drainage, and foundation work. If you’re weighing an ADU, a home addition, or a room addition, call (903) 568-7222 and we’ll walk you through what’s realistic for your specific street before anyone spends a dime.
Why Hacienda Heights Homes Are Different
Hacienda Heights housing stock runs heavily to single-family homes built between the 1950s and 1980s, many on hillside lots that flatten out as you move toward the valley floor. That terrain matters. A backyard ADU off Kwis Avenue often sits on a grade, which means step-down foundations and retaining walls enter the conversation early. Homes near the northern edge of town, closer to the Puente Hills, deal with steeper slopes and tighter access for a crane or concrete truck. Older subdivisions north of Colima Road and east of Seventh Avenue also tend to have mature trees whose root systems need to be worked around during excavation.
Hacienda Heights sits in unincorporated Los Angeles County, so ADU permits go through county planning rather than a city building department. That affects review turnarounds and plan-check comments in ways that differ from neighboring incorporated cities. We’ve also found that many of the original ranch-style homes here were built on concrete slab foundations at a time when title 24 energy requirements and current ADU size maximums weren’t on anyone’s radar. A good Hacienda Heights ADU design works with the lot’s existing drainage patterns instead of fighting them, which is exactly the kind of thing we resolve during the written estimate walkthrough.
Our Main Hacienda Heights Services
These are the three jobs Hacienda Heights homeowners call us about most. Each has its own detailed page covering pricing, process, and local specifics.
ADU Builders in Hacienda Heights
A detached ADU here usually means a 400 to 1,200 square foot unit in the side or rear yard. County setback rules, utility trenching, and slope drainage all shape the plan. We build both prefab panel ADUs and fully site-built units, and we help you decide which makes sense for your lot’s access and grading. Hacienda Heights backyards off streets like Wedgeworth Drive or Stimson Avenue often need the unit placed carefully to preserve usable outdoor space. ADU Builders in Hacienda Heights covers the full build from plans to occupancy.
Home Addition Contractor in Hacienda Heights
Home additions here are typically ground-up expansions: a new primary suite, a larger kitchen, or a family room bumped out toward the yard. Older Hacienda Heights homes frequently have roof lines and electrical panels from the original build that need upgrading to carry the new square footage. We handle the structural work, the permit set, and the finish, including matching rooflines so the addition doesn’t read as an afterthought. Home Addition Contractor in Hacienda Heights has the full breakdown.
Room Addition Contractor in Hacienda Heights
A room addition is often the fastest path to more space without moving: converting an enclosed patio, extending a bedroom, or adding a home office over a crawlspace. Hacienda Heights homes built on slab or raised foundations each have different under-floor access, and that single factor can change cost and timeline by thousands of dollars. We inspect what’s under the house before we quote, so the price you get is the price you pay. Room Addition Contractor in Hacienda Heights explains the process.
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
For prefab ADU builds in Hacienda Heights, we work with Abodu, Cover, and Dvele, plus site-built designs using James Hardie cladding. Panels are staged at our Los Angeles yard and delivered to Hacienda Heights on a schedule that matches your permit approval. See our brands.
Pricing for ADU Company in Hacienda Heights, CA
| Service | Typical range in Hacienda Heights |
|---|---|
| Detached ADU (400 – 800 sq ft, prefab panel) | $120,000 – $225,000 |
| Detached ADU (800 – 1,200 sq ft, site-built) | $240,000 – $390,000 |
| Garage conversion ADU | $85,000 – $150,000 |
| Attached ADU (addition with separate entrance) | $110,000 – $200,000 |
| Home addition (300 – 600 sq ft) | $95,000 – $190,000 |
| Home addition (600 – 1,000 sq ft) | $200,000 – $335,000 |
| Room addition (single room, 150 – 300 sq ft) | $55,000 – $110,000 |
| Room addition with bathroom | $85,000 – $140,000 |
| Foundation and drainage work (hillside lots) | $18,000 – $45,000 |
| Permit set and county fees (LA County) | $6,000 – $15,000 |
Hillside grading, retaining walls, and water or sewer line relocation are the three biggest price drivers in Hacienda Heights, especially on lots in the northern hills. Every Benson ADU Builders quote is a written price before work starts, so those site costs are captured up front instead of showing up as a surprise change order.
Neighborhoods We Serve in Hacienda Heights
We run crews throughout Hacienda Heights, from the hillside streets north of Colima Road down to the flatter lots near the southern edge of town. Most appointments in Hacienda Heights are scheduled within a few business days.
- Hills around Kwis Avenue and Wedgeworth Drive
- Streets off Seventh Avenue, north and south
- Area around Wedgeworth Elementary
- Neighborhoods east of Stimson Avenue
- Lots near the Puente Hills Mall corridor
Service Area – Cities Near Hacienda Heights
Our Hacienda Heights crews also cover nearby communities. If you’re in Rowland Heights, CA or La Puente, CA we can usually schedule within the same week. We also run jobs in Whittier, CA and La Habra, CA on a regular rotation. Call (903) 568-7222 and we’ll confirm the next available appointment for your address.
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
Yes. Hacienda Heights is unincorporated Los Angeles County, so ADU and addition permits go through LA County Planning and Public Works. We prepare the full permit set, submit it, respond to plan-check comments, and stay on it until you have the approved permit in hand. The fee range is in the pricing table above.
In most cases, yes. Hillside lots often need step-down foundations, retaining walls, and engineered drainage, and those costs are included in your written quote before work starts. We’ll tell you during the walkthrough if your slope would trigger a geotech report, which adds cost but keeps the build safe.
Site visits are typically scheduled within a few business days. The start date depends on your permit approval with LA County, which varies by project scope. Once the permit clears, our Hacienda Heights schedule is set with a written start date, not a window. Call (903) 568-7222 for a free estimate and we’ll outline the timeline at your walkthrough.
When you’re ready to talk numbers, call (903) 568-7222. Every Hacienda Heights project starts with a free site walk and a written price. No verbal ballparks, no surprises at the door.
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
"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.
