A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateADU Company in Highland Park, CA
Adding an ADU in Highland Park means working with hillside lots, older Craftsman homes, and local building rules that don’t apply in most of Los Angeles. Benson ADU Builders handles every part of that process, from the first site check to the final inspection. We quote a written price before any work begins, and we build with brands you can research yourself, including Abodu, Cover, and Dvele. Call (626) 658-3527 for a free estimate and we’ll tell you exactly what’s possible on your specific lot.
Why Highland Park Homes Are Different
Highland Park is dense with 1900s to 1940s Craftsman, Spanish Colonial, and bungalow homes, and a huge share of them sit on compact lots that climb uphill from the street. That changes the ADU conversation immediately. A flat-lot backyard cottage plan that works in other LA neighborhoods often doesn’t work in Highland Park because backyards are frequently terraced into hillsides. On many lots, the smarter move is a garage conversion, a build-over-garage unit, or a basement conversion that avoids cutting into an unstable slope altogether.
The hills also affect drainage. Highland Park gets hot, dry summers and brief but intense winter downpours, so a properly done ADU here needs real drainage planning for sloped terrain, not a token downspout. Drought-tolerant landscaping matters, too. We see retaining wall and foundation questions come up on Highland Park projects far more often than on flat-lot builds a few miles away. Local hillside ordinances can limit height and placement, which is why we walk every lot before quoting. We don’t guess from a satellite photo.
Our Main Highland Park Services
Homeowners in Highland Park usually reach out to us for one of three things: a detached or attached ADU, a full home addition, or a single room addition. Here’s what each looks like in this neighborhood.
ADU Builders in Highland Park
Highland Park’s rental market is strong, and a well-designed ADU on a hillside lot can add rentable square footage without sacrificing the small yard you already have. We build garage conversions, over-garage units, and basement ADUs here because those typologies make sense on sloped lots. Prefab options from Abodu and Cover can shorten the site-build timeline where the lot allows. If your property has slope, setback, or access constraints, we’ll walk the site first and tell you plainly what’s buildable. ADU Builders in Highland Park
Home Addition Contractor in Highland Park
A full addition on a 1920s Highland Park Craftsman means matching rooflines, foundation work on grade changes, and sometimes adding living space up instead of out. We handle the whole job, including structural engineering and permits, but we always start with a written price and a clear scope. If your lot slopes, expect foundation and retaining costs that flat-lot additions don’t carry. That’s standard for Highland Park, and we include it in the quote from day one. Home Addition Contractor in Highland Park
Room Addition Contractor in Highland Park
Adding one room in Highland Park often means converting an enclosed porch, bumping out a rear wall, or building a small second-story pop-up over an existing single-story section. Many of these homes have tight side yards that affect access and placement, so we design around what the lot actually gives us. The goal is a room that feels like it was always part of the house, not bolted on. You’ll get a fixed written price before we start. Room Addition Contractor in Highland Park
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 Park
We build with and maintain ADU structures from the names you can research yourself, including Abodu, Cover, Dvele, and James Hardie cladding. If you already own one of these brands or want to spec it for a new Highland Park build, we can help. Check out our brands for the full list and what each option costs in practice.
Pricing for ADU Company in Highland Park, CA
| Service | Typical range in Highland Park |
|---|---|
| Detached ADU (prefab, turnkey) | $180,000 – $320,000 |
| Detached ADU (site-built, turnkey) | $220,000 – $420,000 |
| Garage conversion ADU | $120,000 – $210,000 |
| Over-garage ADU | $160,000 – $280,000 |
| Basement conversion ADU | $140,000 – $260,000 |
| Home addition (400 – 800 sq ft) | $140,000 – $320,000 |
| Home addition (800 – 1,200 sq ft) | $240,000 – $450,000 |
| Room addition (single room) | $60,000 – $130,000 |
| Second-story addition over existing home | $200,000 – $380,000 |
| Foundation and retaining wall work (hillside lots) | $15,000 – $60,000 |
Sloped lots in Highland Park push foundation, retaining, and drainage costs up compared to flat-lot builds. Lot access matters too: a tight alley or narrow street can add crane or material-handling costs. Whatever the number, you’ll see it in writing before we begin, and the price doesn’t change unless you change the scope.
Neighborhoods We Serve in Highland Park
We cover the entire Highland Park area, including the streets above York Boulevard, the hills around Mount Washington’s north edge, and the older blocks near Figueroa where the bungalow stock is densest. Here are a few of the areas we work in most often:
- Garvanza
- Hermon
- Montecito Heights border
- York Boulevard corridor
- Figueroa Street historic district
Most Highland Park projects are within a 15 to 20 minute drive for our scheduling team, so estimates happen fast and crews arrive when the schedule says they will.
Service Area – Cities Near Highland Park
While this page focuses on Highland Park, our crews also work in Pasadena, CA, El Monte, CA, East Los Angeles, CA, and Monterey Park, CA. If you’re on the edge of Highland Park or just outside it, call and we’ll tell you straight whether your address is in our service area.
Serving Highland Park, CA - Our Local Coverage Area
We’re based in the Highland Park 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 Park
Yes. Highland Park has local hillside ordinances that affect height, setbacks, and grading, and we handle those permits as part of the job. We’ll tell you during the first site visit what your specific lot triggers, and the written quote includes all required permit work. Call (626) 658-3527 to schedule a free site visit.
Scheduling depends on the scope, but once permits are approved, most Highland Park ADU projects break ground within a few weeks. Prefab options like Abodu and Cover can shorten the on-site build time compared to site-built plans. Call (626) 658-3527 and we’ll give you a realistic start window for your project size.
Highland Park’s winter rains are short but can be intense, especially on hillside lots. We schedule site work around weather windows and stage drainage and erosion control before heavy rain hits. Your project may pause for a few days, but it won’t wash out. Estimates are free: call (626) 658-3527 and we’ll walk you through the timeline.
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 Park Customers Say
"Garage conversion into a guest suite. I could see the permit status in the app, which made it painless."
- Rick F."Room addition off the kitchen. Framing, drywall, and paint all done well."
- Wade L."Fixed quote and clear change orders approved by text."
- Trina M.
