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, garage conversion, or room addition in Hacienda Heights means working with hillside lots, older 1960s and 1970s housing stock, and Los Angeles County permitting. Fielding ADU Builders handles all three, with a written price before any work starts and a one-year written guarantee on every project. Call (361) 315-4177 to schedule a free estimate.
Why Hacienda Heights Homes Are Different
Hacienda Heights sits on rolling terrain below the Puente Hills, and that topography shapes almost every ADU and addition we build here. Many homes are built into slopes, which means foundation work often requires stepped footings, retaining walls, or additional grading before a backyard ADU can go in. The original housing stock dates mostly from the 1950s through the 1970s, so we regularly deal with older electrical panels that need upgrading to support a new dwelling unit, and floor plans that were never designed for the kind of expansion homeowners want now.
Because Hacienda Heights is unincorporated Los Angeles County, permits go through LA County Building and Safety rather than a city hall. That changes timelines and plan-check requirements. Some neighborhoods also sit within HOA boundaries, and those associations have their own review process on top of the county’s. We account for both before the first day of work, so the schedule we put in writing is one you can actually plan around.
Our Main Hacienda Heights Services
Most Hacienda Heights homeowners who call us are weighing two or three ways to add space: build out, convert what they already have, or add a detached unit. All three have their own page here.
Room Addition Contractor in Hacienda Heights
A room addition here usually means expanding a single-story ranch out into the side yard or up into a second story where the lot allows it. Hillside setback rules and county grading requirements often drive the design more than the homeowner’s wish list does. We pull the permits, handle the foundation and framing, and match the roofline so the addition doesn’t look bolted on. Written pricing comes before any work starts. See Room Addition Contractor in Hacienda Heights for full details.
Garage Conversion Contractor in Hacienda Heights
Many Hacienda Heights garages are attached, which makes conversion faster and less expensive than building new. The tradeoff is that you lose parking and storage, so the plan has to account for both. We handle the insulation, drywall, electrical, and the county-required changes that turn a garage into legal living space. If you have an older panel or a slab that needs leveling, that gets priced in writing before we start. Learn more at Garage Conversion Contractor in Hacienda Heights.
ADU Builders in Hacienda Heights
Backyard ADUs in Hacienda Heights range from 400-square-foot studios to two-bedroom units with full kitchens. Sloped lots typically require a pier-and-beam or stepped foundation, and utility runs may cross more of the property than they would on flat ground. We build both conventional ADUs and prefab units from Abodu, Cover, Dvele, and Mighty Buildings, matching the method to your lot and budget. See ADU Builders in Hacienda Heights for specific pricing and timelines.
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 work with Abodu, Cover, and Dvele prefab ADU systems, and we stock common replacement parts and finishing materials locally so punch-list items don’t wait on long-lead shipping. Warranty service on those units goes through our crew, not a third party. Our full brand list is on our brands page.
Pricing for ADU Company in Hacienda Heights, CA
These are the ranges we quote most often in Hacienda Heights. Every project gets a written line-item price before work starts, so the number you approve is the number on the final invoice.
| Service | Typical range in Hacienda Heights |
|---|---|
| Backyard ADU (detached, 400 – 800 sq ft) | $180,000 – $280,000 |
| Backyard ADU (detached, 800 – 1,200 sq ft) | $260,000 – $380,000 |
| Prefab ADU (Abodu, Cover, Dvele) | $150,000 – $300,000 |
| Garage conversion (attached, 400 – 500 sq ft) | $90,000 – $150,000 |
| Garage conversion (detached) | $110,000 – $180,000 |
| Room addition (300 – 500 sq ft) | $95,000 – $165,000 |
| Room addition (500 – 800 sq ft) | $150,000 – $260,000 |
| Foundation work on sloped lot (stepped footings, retaining) | $15,000 – $45,000 |
| Electrical panel upgrade (100A to 200A) | $3,500 – $6,500 |
Sloped lots push foundation and drainage costs up, and older homes often need panel or sewer upgrades before an ADU can pass inspection. We put every one of those line items in writing before you commit, so there are no change orders at the door.
Neighborhoods We Serve in Hacienda Heights
We work across all of Hacienda Heights, from the flats near Hacienda Boulevard up into the hill streets where grading and access get more complicated. Our crews are local to the area, so scheduling is predictable.
- Skyline Drive corridor
- Pepper Brook area
- Glenbrook
- North Hacienda Heights
- South Hacienda Heights
Service Area – Cities Near Hacienda Heights
In addition to Hacienda Heights, we serve La Puente, CA, Rowland Heights, CA, Whittier, CA, and La Habra, CA. If you’re just outside those areas, call us and we’ll tell you straight whether we can take the job.
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
Most ADU and addition permits in unincorporated Hacienda Heights take 3 to 6 months from submittal to approval, depending on plan-check volume and whether your lot triggers hillside or drainage review. We handle the submittal and revisions, and we build the realistic timeline into your written proposal before you sign. Call (361) 315-4177 if you want a permit timeline for your specific lot.
Some do. LA County allows ADUs under state law, but an HOA can impose its own design review, setback guidelines, and approval steps on top of the county process. We review your HOA’s CC&Rs before the first drawing so you don’t pay for a design the association will reject. A free estimate includes that review.
No, and we won’t. Starting unpermitted work in unincorporated LA County puts you at risk of a stop-work order, fines, and trouble when you sell. We wait for the permit board to go up before any construction begins. The schedule accounts for that, and the price is fixed either way.
Call (361) 315-4177 to schedule a free estimate for your Hacienda Heights ADU, garage conversion, or room addition. Reed Calloway will walk the property with you and put the price in writing.
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
"Clear price breakdown. Change orders were all in writing."
- Hal P."Solid job. Cabinet delivery was a week behind but they worked around it."
- Ben G."Insulation, drywall, and finishes were all well done. Feels like part of the house."
- Pete O.
