ADU Builders in Highland - Design, Permits and Build Under One Contract

Fast, Reliable ADU Builders Across Highland

Building an accessory dwelling unit – a second, smaller home on your existing lot – in Highland, CA typically costs $180,000 to $320,000 for a detached unit, and the biggest variable is where your street sits on the CAL FIRE hazard map. If your parcel north of Base Line falls in a Very High Fire Hazard Severity Zone, Chapter 7A ignition-resistant materials will add $15,000 to $25,000 to the budget before a single plan is drawn. Our ADU Builders team pulls that map lookup first, before we sketch anything, because we’ve seen too many Highland homeowners eat a redesign cost they could have avoided. Call (254) 602-5618 and talk to a real person about your lot today.

Call (254) 602-5618

We know Highland’s streets, from the flat ranch tracts south of Base Line up into the foothill developments near Panorama. Russ Delmar leads our team, and when we walk a Highland property, we’re looking at panel size, pipe condition, and fire zone status before we promise a price. That’s the only honest way to quote an ADU here.

Why Lodgewick ADU Builders Is Highland’s Preferred ADU Builders Company

Highland homeowners have a specific set of concerns that don’t show up in Redlands or Loma Linda. Fire hazard mapping, older 100-amp panels, galvanized supply lines, and the freeze-thaw cycle up toward the foothills all change how an ADU gets designed and permitted here. We’ve walked enough Highland parcels to know the question to ask first: where does this lot sit on the FHSZ map? Getting that answer wrong is expensive.

Every Highland project operates under The Kingswell Guarantee, the commitment the Kingswell family built this company on. You get a written price before work starts, a defined arrival window, a clean job site, and a written guarantee on every build. If something isn’t right within 365 days, we come back and fix it. That’s the whole point of the 365-Day Done Right Promise – it’s not a slogan we put on a truck, it’s a document you get before we drive the first nail.

We’re not a national chain. We’re the ADU company of the Kingswell family, established in 2010, and this Highland crew is dispatched from the Inland Empire office that schedules every build we do in the San Bernardino-Riverside corridor. When you call, a live person answers. Not a voicemail loop, not a chatbot. That matters at 2 a.m. when you’re lying awake wondering if your permit will clear.

ADU Plans in Highland

ADU Plans in Highland are the single most consequential decision in the entire build, and where most projects go wrong before construction ever starts. In Highland specifically, a plan set isn’t just a floor layout – it’s a fire-safety document. Streets north of Base Line, climbing toward the San Bernardino Mountain foothills, are mapped Very High Fire Hazard Severity Zones. That means the plan set must specify Chapter 7A ignition-resistant construction from the first drawing: ember-resistant vents, fire-rated siding, and Class A roofing. Skip that step and you’re paying a redesign fee after permit intake.

Fire Zone Mapping Before Drawing

We pull the CAL FIRE FHSZ map lookup before we draw a single plan. One zone designation can swing a detached unit budget by $15,000 to $25,000. A plan drawn for the wrong zone is a plan that gets rejected, and a homeowner who just spent $4,000 to $9,000 on plans gets to spend it again. We don’t do that to people.

Open-Wall Discovery Planning

Highland’s housing stock is heavy with 1960s to 1980s ranch homes, and those houses hide things. Cloth-wrapped wiring, galvanized pipes that are already weeping, undersized framing. A good plan set builds allowances for those discoveries into the contract up front, so when the wall opens and the surprise is there, the price doesn’t move. Russ Delmar insists on this. If a plan doesn’t account for the reality of a 1968 Highland ranch, it isn’t a plan, it’s a wish.

ADU Contractor in Highland

ADU Contractor work in Highland means acting as the licensed general contractor who carries the build from permit to final inspection – and in this city, that role comes with fire-zone obligations no flat-valley contractor ever deals with. We schedule inspections, order Chapter 7A-compliant materials, coordinate the panel upgrade if your 100-amp service needs to go to 200 amps, and keep the job site clean enough that your neighbors don’t start complaining. The Kingswell Way is the standard here: say the price before the work, show up in the window given, leave the place cleaner than we found it, put the guarantee in writing, and come back if it fails.

Panel and Utility Upgrades

The average Highland ranch built between 1965 and 1985 came with a 100-amp panel. An ADU with a mini-split, a water heater, and a kitchenette generally needs 200 amps. We scope that upgrade during the estimate, not after the drywall is open. Same with plumbing: those galvanized supply lines under a 1970s slab don’t have another forty years in them, and tying an ADU into failing pipe is a warranty claim waiting to happen.

Prefab and Panelized Installations

Some Highland lots are a strong fit for prefab manufacturers like Abodu, Cover, or Dvele, especially when the parcel is flat, accessible, and south of the fire zone with a simpler Chapter 7A profile. A factory-built module can cut on-site time significantly. We’ve installed prefab on Highland lots and matched the factory specs to the local permit requirements. The catch is always the same: Highland’s fire-zone rules apply to prefab too, and not every factory default meets Chapter 7A. We handle that coordination so you don’t get a red-tagged delivery.

Trusted Brands We Service in Highland

We work regularly with established ADU manufacturers and materials suppliers, and we stock the local parts Highland homes actually need. That includes James Hardie ignition-resistant siding for foothill parcels, Abodu and Cover prefab units where the lot suits them, and Dvele for homeowners who want a high-performance panelized build. When a Highland homeowner needs a Chapter 7A-compliant assembly, we know which of these manufacturers can meet the spec without a costly factory rework. Parts lead times matter here too – winter freezes and Santa Ana wind events can delay deliveries to upper Highland streets, so we order early and stage materials off the mountain when we need to.

Common ADU Builders Problems We See in Highland Homes

• Designing before the fire zone lookup. A homeowner pays for a full plan set for a detached ADU north of Base Line, submits it, and learns the parcel is VHFHSZ. The redesign for Chapter 7A siding, vents, and roofing adds $15,000 to $25,000, and the timeline slides by weeks. We pull that map before we draw.
• Assuming the existing panel can carry the load. A 1960s or 1970s Highland ranch with a 100-amp service and gas appliances might squeak by until you add a mini-split, an electric range, and a water heater in the new unit. Then the main breaker trips. We price the 200-amp upgrade into the quote from day one.
• Galvanized plumbing failing mid-project. Older Highland homes frequently have galvanized supply lines that have been corroding for 50 years. Opening the wall between the house and the new ADU feed reveals weepy, brittle pipe that won’t pass inspection. A partial re-pipe in PEX is often the only real fix, and it’s cheaper to know that going in.
• Freeze and wind damage to exposed equipment. Highland’s foothill elevation produces periodic hard freezes and strong Santa Ana events that valley-floor builds don’t experience. Rooftop mini-split equipment and exposed utility connections need freeze protection and wind bracing specified in the plan, not improvised on site.

Pricing for ADU Builders in Highland, CA

We Also Serve Cities Near Highland

Our Highland crew regularly builds in Highland and the surrounding communities, so if you’re in San Bernardino, Loma Linda, Redlands, or Mentone, we know your permit office and your local fire-zone questions too. Call (254) 602-5618 and ask for Russ Delmar. We’ll give you a straight answer about your lot and a written price to match.

FAQs About ADU Builders in Highland