A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateFast, Reliable Garage Conversion Contractor Across Highland
Most garage conversions in Highland run between $85,000 and $160,000 when done with permits, but the number that actually matters is the one a contractor writes down before the first day of work. That’s where we start. Lodgewick ADU Riverside serves Highland homeowners with fixed written pricing, a real arrival window, and a clean job site, every time. If you’re weighing a garage conversion against a detached ADU on your lot, call (831) 292-4191 and we’ll walk you through the numbers honestly.
Why Lodgewick ADU Riverside Is Highland’s Preferred Garage Conversion Contractor Company
Highland’s housing stock is specific: 1970s to 1990s single-story ranch and Spanish-style homes, most on slabs, many with detached garages that were never plumbed or wired for living space. We know what that means before we set foot on the property, because we’ve done this work from Baseline Street to the neighborhoods east of Palm Avenue. Our Garage Conversion Contractor team has converted dozens of these exact garages, and we’ve learned where the surprises hide.
Russ Delmar leads our Highland projects. He’s the person who walks your site, measures the slab, checks the panel, and tells you what the trenching will actually require. When Highland homeowners call us, they get a live person, not a voicemail. And when we say a crew will arrive between 8 and 9, that’s when the truck pulls up.
We’re part of the Kingswell family of home-service companies, founded in 2010. Our Highland customers get the same written guarantee every customer gets: if the work isn’t done right, we come back and make it right within 365 days. No fine print, no phone tag.
Garage Apartment Conversion in Highland
Garage Apartment Conversion in Highland means turning a garage, attached or detached, into a self-contained rental unit with its own kitchen, bathroom, entrance, and sleeping area. On Highland’s 7,200+ sq ft lots, homeowners often choose this route because it adds monthly rental income without eating the yard space a separate detached ADU would require. The typical range here is $110,000 to $165,000, with the spread driven almost entirely by what’s underground: trenching distances, sewer lateral condition, and panel capacity.
What the Trenching Really Costs
Highland garages from the 1970s through 1990s were built for cars, not for cooking and showering. Running a new sewer line from a detached garage to the main lateral, through a side yard with aging clay pipe, typically adds $6,000 to $12,000. Homeowners who skip this step end up with a macerating toilet that fails in two years, and no permit to show for it. If you want a real rental unit on Highland’s rental market, you need a real sewer connection.
Panel Upgrades Before Permits
We won’t quote a garage apartment conversion in Highland without checking the existing electrical panel. Older homes east of Palm Avenue frequently still run on 100-amp service, and adding a mini-split, an induction range, and a water heater puts you over. A 200-amp service upgrade runs $3,500 to $5,500, and it has to happen before the city signs off.
Garage Conversion Permit in Highland
A Garage Conversion Permit in Highland is the building permit you pull through the City of Highland Building and Safety Division before any structural, electrical, plumbing, or mechanical work begins on a garage conversion. The city enforces its ADU ordinance under California state law, which caps new detached ADUs at 1,200 sq ft but allows garage conversions within the existing footprint. Our team handles the permit set, the plan check, the inspections, and all corrections so you never sit on the phone with a plan checker.
Why Permits Are Non-Negotiable
An unpermitted garage conversion in Highland is a liability you carry into every future sale, refinance, and insurance renewal. The city can flag unpermitted square footage during a standard resale inspection. We pull permits on every conversion, and we coordinate the inspections, including the electrical sign-off and the final building inspection. The permit process here typically takes 6 to 10 weeks from submittal to approval for a standard garage-to-ADU conversion.
What Highland’s Inspectors Actually Check
Highland inspectors focus on title 24 energy compliance, egress windows in sleeping rooms, and the separation between garage slab and living space. If your garage slab lacks a proper vapor barrier, the inspector will require one, and that’s when you want a contractor who anticipated it before framing. We include moisture-resistant drywall and slab vapor barrier review in every Highland quote, because the summer monsoon spikes make mildew a real failure mode here.
Trusted Brands We Service in Highland
We work directly with James Hardie siding, Abodu panelized systems, and Cover prefab modules on Highland garage conversions. These aren’t just brand names in a brochure; they’re materials we’ve installed on local lots and can show you in person. If a Highland homeowner wants a James Hardie exterior to match the existing house, we stock the local color palette and trim profiles. For prefab ADUs from Abodu or Cover, we coordinate the site work, foundation, utilities, and permit set so the factory-built shell lands on schedule. No waiting weeks for out-of-state freight when the product line is already in our supply chain.
Common Garage Conversion Contractor Problems We See in Highland Homes
- Skipping the 200-amp upgrade until inspection fails. We see this at least twice a quarter. A contractor quotes the job without checking the panel, pulls permits, and the electrical inspector rejects the rough-in because the 100-amp service can’t support the new load. The homeowner is now paying for an emergency panel change and a delay.
- Quoting without trenching for sewer and water lines. Detached garages in Highland were not built with stubbed plumbing. If your contractor’s quote doesn’t include trenching from the garage to the main line, that quote is fiction. We itemize it on every bid.
- Standard drywall in a converted garage with no slab vapor barrier. Highland’s summer humidity spikes and the occasional monsoon storm can drive moisture up through an unsealed slab. Standard gypsum wicks that moisture, and you get mildew inside the walls. We specify moisture-resistant board and seal the slab before framing.
- Ignoring the ADU size cap and lot coverage rules. Highland’s 1,200 sq ft ADU cap affects attached conversions. If your garage is 500 sq ft and you’re thinking about a future addition, plan the layout now. Reconfiguring later means a new plan check and new fees.
Pricing for Garage Conversion Contractor in Highland, CA
A permitted attached garage conversion in Highland typically runs $85,000 to $130,000. A detached garage conversion to a full ADU with a separate entrance runs $120,000 to $165,000. The delta comes from trenching distance, panel upgrades, slab condition, and finish level. A basic studio with a kitchenette and full bath on one end sits at the lower bound. A one-bedroom with a separate entrance, mini-split HVAC, and James Hardie exterior runs at the top. We write the price down before any work starts. No change orders at the door, no re-quotes after demo. Call (831) 292-4191 for a free, itemized estimate.
We Also Serve Cities Near Highland
Lodgewick ADU Riverside serves Highland and the surrounding communities, including Rialto, Riverside, Calimesa, and Fontana. If you’re in one of those cities and comparing garage conversion contractors, the same written pricing and 365-Day Done Right Promise applies. Our crews are dispatched from the Inland Empire office and work throughout the region.
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 Garage Conversion Contractor in Highland
Yes, almost certainly. A 100-amp panel cannot safely supply a mini-split heat pump, an electric range, a water heater, and a kitchen circuit load all at once. Highland homes built between the 1970s and early 1990s, especially east of Palm Avenue, commonly still carry 100-amp panels. Budget $3,500 to $5,500 for a 200-amp upgrade, and expect the city to require it before the electrical rough-in passes. Call (831) 292-4191 and we’ll check your panel during the free estimate.
No, not if you want a legal, permitted ADU. A detached garage in Highland was not built with plumbing stubs, so a new sewer lateral and water service must be trenched from the garage to the main lines. Expect $6,000 to $12,000 depending on distance and soil. Some homeowners try a macerating toilet to avoid the trench, but most eventually replace it with a real sewer connection after the first failure. We include trenching in every detached garage quote.
The panel upgrade combined with sewer trenching. Those two items together routinely add $9,000 to $17,000 to a Highland garage conversion, and they’re rarely itemized in lowball quotes. The second hidden cost is slab vapor barrier work, which runs $2,500 to $5,000 depending on the existing condition. Our written price includes these items the first time.
Yes. Highland allows attached garage conversions within the existing footprint, but new detached ADUs are capped at 1,200 sq ft. If your attached garage is smaller than that, the conversion is straightforward. If you’re planning a detached garage conversion that also adds square footage, the 1,200 sq ft cap and lot coverage rules come into play. We’ll check your specific lot dimensions against the city’s current ordinance during the estimate.
Highland does not require separate utility metering for a garage-conversion ADU on the same parcel. A separate address is typically assigned for mail and 911 purposes once the unit is permitted and finaled. We coordinate that with the city and the post office as part of the permit closeout. Call (831) 292-4191 to schedule your free estimate, and we’ll map out the full timeline for your Highland property.
Written by Russ Delmar, Owner at Lodgewick ADU Riverside, serving Highland and the surrounding Inland Empire communities.
