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
Highland, CA sits at the base of the San Bernardino Mountains, and that location shapes nearly every ADU and home addition we build here. The housing stock is mostly single-family homes from the 1950s through the 1980s, with generous lot sizes compared to denser Inland Empire cities. That means real room for a detached ADU, a garage conversion, or an attached addition. If you’re weighing an ADU in Highland, call (903) 568-7222 and we’ll walk you through what’s possible on your specific lot.
Why Highland Homes Are Different
Highland’s climate does two things to building projects. The summers are hot and dry, which means materials like framing lumber and exterior cladding expand and contract through wide temperature swings. The winters bring cold snaps and occasional frost, so insulation and weatherproofing details matter more than they do closer to the coast. Homes in East Highlands, along Baseline and Boulder Avenue, tend to sit on larger parcels with older infrastructure, so we often find original cast-iron drain lines and undersized electrical panels when we start a project. That’s normal here; we plan for it up front instead of making it a surprise change order.
Terrain varies across the city. Closer to the hills, lots slope and some require stepped foundations or retaining work for an ADU. Down in the flatter sections near Victoria Avenue and Greenspot Road, grading is easier but soil conditions still call for proper compaction before slab work. Highland also has a mix of long-established neighborhoods and newer developments, and each has different setback rules and utility access. We handle all of it, but the point is: a Highland project is never a copy-paste job.
Our Main Highland Services
Most Highland homeowners call us about one of two things: building a new ADU on their property, or adding square footage to the house they already have. Here’s what each looks like in Highland, with a dedicated page for the details.
ADU Builders in Highland
Highland’s lot sizes make it one of the easier Inland Empire cities for a detached ADU. We build both prefab and site-built units, and we help you sort out which one fits your yard, your budget, and the city’s setback requirements. A common Highland scenario: a 1960s rancher with a deep backyard, plenty of room for a 600 to 800 square foot ADU behind the garage. See the full breakdown on our ADU Builders in Highland page, including exact cost ranges and how the permits work here.
Home Addition Contractor in Highland
When Highland homeowners outgrow their space, they usually add out rather than up. Single-story additions are the norm here, since most of the housing stock is one level. Typical projects include an extra bedroom and bathroom suite, a den, or a larger living area that opens to the backyard. Older homes need careful tying-in of rooflines and foundations, which is standard work for us. Our Home Addition Contractor in Highland page covers pricing by room type and what to expect from start to finish.
Room Addition Contractor in Highland
Smaller than a full home addition, a room addition is one defined space: a home office, a laundry room, a guest bedroom, or a sunroom. Highland homeowners often ask us to convert an existing covered patio into living space, which is faster and cheaper than building new walls from scratch. The Room Addition Contractor in Highland page has itemized costs and timelines for the room types we do most 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
We bring product options to Highland that most local contractors can’t. We build with prefab systems from Abodu, Cover, and Dvele, plus James Hardie cladding when you want a site-built aesthetic with engineered durability. Each brand has its own lead time and price point, and we’ll give you honest numbers for all of them. Learn more on our brands page.
Pricing for ADU Company in Highland, CA
These numbers reflect what we see in Highland in 2025. Every project gets a written line-item price before work starts, so the number below is your starting point, not a teaser.
| Service | Typical Range in Highland |
|---|---|
| Detached ADU (prefab, 400 – 500 sq ft) | $115,000 – $165,000 |
| Detached ADU (prefab, 600 – 800 sq ft) | $165,000 – $235,000 |
| Detached ADU (site-built, 600 – 800 sq ft) | $210,000 – $305,000 |
| Garage conversion ADU | $105,000 – $155,000 |
| Attached ADU (addition-style) | $135,000 – $195,000 |
| Junior ADU (JADU, interior conversion) | $65,000 – $105,000 |
| Home addition (bedroom + bathroom suite) | $145,000 – $215,000 |
| Home addition (den, office, or flex room) | $80,000 – $135,000 |
| Room addition (single room, finished) | $60,000 – $110,000 |
| Site work, grading, and foundation prep | $8,000 – $25,000 |
What pushes a Highland price up? Sloped lots, old electrical panels that need an upgrade, and distance from utility connections all add cost. What doesn’t change: the price we put in writing is the price you pay.
Neighborhoods We Serve in Highland
We work across the full city, from the older streets near Baseline to the newer developments toward the east. Most of our Highland crews live and work in the same area, so response is quick in every part of town.
- East Highlands
- North Highland
- Greenspot
- Highland Village area
- East Highland Ranch
Service Area – Cities Near Highland
Besides Highland, Benson ADU Builders covers the surrounding San Bernardino Valley. We regularly build ADUs and additions in San Bernardino, CA, Loma Linda, CA, Redlands, CA, and Mentone, CA. Same written-price guarantee, same crews, same standard on every job.
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
Most Highland projects start within four to eight weeks of the signed contract. Prefab ADUs can move faster because the unit is built off-site while permits are being processed. Call (903) 568-7222 and we’ll give you a real start date, not a vague “soon.”
Yes. We prepare and submit the permit drawings for the City of Highland, and we work with your HOA if you have one. Every project is different, but we give you a written checklist of approvals needed before we start.
Absolutely. Tell us your desired size, whether it’s prefab or site-built, and a few details about your lot, and we’ll send a ballpark range by text or email. The written firm price comes after a site visit, and it’s always free. Call (903) 568-7222 for a free estimate.
If you’re thinking about an ADU or addition in Highland, start with a conversation. We’ll answer your questions, give you real numbers, and put the plan in writing. Call (903) 568-7222 to schedule your free estimate.
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
"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.
