A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateADU Company in Highland, CA
Fielding ADU Builders handles ADU construction, garage conversions, and room additions in Highland, CA. The work here runs into a particular set of conditions: older slab homes on compact lots, a warm inland climate that punishes cheap materials, and a city planning process that asks for real drawings before anything gets approved. Whether you’re adding a backyard unit off Baseline or converting an attached garage on a 1970s ranch, the job starts with a written price and ends with a one-year written guarantee. Call (361) 315-4177 to talk it through.
Why Highland Homes Are Different
Highland’s housing stock is mostly mid-century single-family homes, and a lot of them were built before the current energy code existed. That matters for two reasons. First, the original electrical panels and subpanels are often undersized for an ADU or a converted garage with its own kitchenette, so part of the scope frequently includes a service upgrade. Second, the slab foundations on these older homes are generally sound, but they have settled, which means tying a new room addition into the existing roofline takes more care than it does on a newer build.
The climate works in your favor and against it. Highland gets hot, dry summers and mild winters, which means a well-built ADU doesn’t fight moisture the way a coastal unit would. But the sun exposure is real. We spec roofing and siding products that hold up under sustained UV rather than the cheapest available trim, and we size the mini-split or HVAC rough-in for the actual summer highs along the East Highland bench. Lots in the older neighborhoods east of the 210 tend to be deeper than they are wide, which shapes where a rear ADU can sit and still leave you a usable yard.
Our Main Highland Services
Most Highland homeowners call us about one of three things: adding square footage to the existing house, converting a garage into living space, or building a detached ADU in the back. Each one has its own page with pricing, timelines, and the permit realities specific to Highland.
Room Addition Contractor in Highland
A room addition here usually means a master suite bump-out or a family room extension, and the biggest variable is how the new roofline ties into the old one. Highland’s mid-century ranches have low slopes, so we typically match the existing pitch and carry the fascia line straight through rather than leaving a visible seam. The foundation work is straightforward on most flat lots, but a few hillside properties east of Webster need taller stem walls and extra drainage. The written price covers all of it before we start. See the full scope here: Room Addition Contractor in Highland.
Garage Conversion Contractor in Highland
Garage conversions are popular in Highland because the attached two-car garages on 1960s and 1970s homes are often underused, and the footprint is already there. The work involves turning a slab-on-grade garage into conditioned space: insulation in the walls and ceiling, drywall, flooring, and a proper electrical run for heat and light. Highland’s building department wants a clear change-of-use permit and a plan showing how the new room meets egress and ventilation requirements. We handle the drawings and the whole build: Garage Conversion Contractor in Highland.
ADU Builders in Highland
Detached ADUs in Highland fall into two camps: conventional stick-built units and prefab platforms that arrive in modules and get set on a foundation. Most Highland lots can take a one-bedroom or two-bedroom unit in the rear yard without a variance, but setback rules shift depending on whether your lot is standard, corner, or flag-shaped. We work with Abodu, Cover, Dvele, and Mighty Buildings where the prefab route fits the budget, and we stick-build with James Hardie siding when the lot or the design calls for it. Full details: ADU Builders in Highland.
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 Highland
Fielding ADU Builders works with several prefab and modular ADU platforms as well as conventional materials. Depending on the project, we install units from Abodu, Cover, and Dvele, and we build conventionally with James Hardie siding and Tuff Shed-style structures. See our brands for the full list and what each one fits best.
Pricing for ADU Company in Highland, CA
| Service | Typical range in Highland |
|---|---|
| Garage conversion (full unit) | $80,000 – $120,000 |
| Garage conversion (basic finish) | $60,000 – $85,000 |
| Detached ADU (prefab, 1-bed) | $120,000 – $180,000 |
| Detached ADU (prefab, 2-bed) | $180,000 – $260,000 |
| Detached ADU (conventional build) | $200,000 – $350,000 |
| Room addition (200 – 400 sq ft) | $60,000 – $140,000 |
| Room addition (400 – 800 sq ft) | $120,000 – $240,000 |
| Electrical service upgrade (if needed) | $3,000 – $6,000 |
| Foundation work (new stem wall) | $4,000 – $10,000 |
| Permit fees and plan drawings | $2,500 – $7,000 |
Prices in Highland move up when the lot is tight and access for equipment is limited, or when the original electrical panel needs to be brought up to current code before an ADU can be fed. The price we put in writing before any work starts is the price you pay at the end. No change orders, no surprises at the final invoice.
Neighborhoods We Serve in Highland
We work across the whole of Highland, from the older streets west of the 210 to the newer tracts along the east side of town. Crews are local to the Inland Empire and scheduled through our Riverside-San Bernardino office, so response time for estimates is usually within a few days.
- East Highlands
- Highland Village
- The bench neighborhoods east of Webster
- Tracts along Baseline and Greenspot
- Areas bordering San Manuel Reservation
Service Area – Cities Near Highland
If you’re just outside Highland, we also cover the surrounding Inland Empire cities. We work in San Bernardino, CA, Loma Linda, CA, Redlands, CA, and Mentone, CA. Give us a call and we’ll confirm coverage for your exact street and lot.
Serving Highland, CA - Our Local Coverage Area
We’re based in the Highland 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 Highland
We schedule estimates within a few business days for most Highland addresses. Build start dates depend on permit approval from the city, which typically runs four to eight weeks for ADUs and room additions. The written price is issued before any work begins, so you’ll know the full number before you commit.
Yes. Any conversion of a garage to living space or construction of a detached ADU requires city permits in Highland. We prepare the plans, submit them, pull the permit, and schedule the required inspections. The permit work is done by the book under The Garrison Code.
No. The price is handed to you in writing before a single nail is driven, and the number you approve on day one is the number on the final invoice. If something is discovered on site that was not visible at the estimate, we discuss it before doing anything and agree on any change in writing. Call (361) 315-4177 for a free estimate; the written price is part of that estimate, not a separate step.
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 Highland Customers Say
"Insulation, drywall, and finishes were all well done. Feels like part of the house."
- Pete O."Built a detached ADU behind our house. The builder is a veteran and runs the site like a platoon: schedule posted, crew on time, everything labeled. Finished within a few days of the date."
- Ken W."Room addition over the back patio. Framing is square, windows are tight, and the roofline matches."
- Danny L.
