A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateFast, Reliable Home Addition Contractor Across Highland
A room addition or sunroom in Highland typically runs $180 – $420 per square foot, depending on finish level and whether the existing 100-amp panel needs upgrading. Most projects we price in Highland fall between $65,000 and $185,000 all-in, permits included. We know that’s a wide spread, which is why we write the real number before any work starts. Call (831) 292-4191 and you’ll get a line-item quote, not a handshake guess.
Our crews work throughout Highland weekly, from the ranch homes near Baseline to the newer parcels east of the 210. We schedule around the city’s permit office, not against it, because the panel upgrade and trenching inspections are where most additions stall. That local familiarity means your job moves on a predictable timeline.
Why Lodgewick ADU Riverside Is Highland’s Preferred Home Addition Contractor Company
We’re the ADU and addition arm of the Kingswell family of home-service companies, established in 2010. Russ Delmar runs our crew, and he’s the reason Highland homeowners see the same faces from first estimate to final walkthrough. Every technician who steps onto your property is background-checked and uniformed. You’ll know exactly who is in your backyard.
Highland homeowners call us because of The Kingswell Guarantee: a written price before work begins, a defined arrival window, a clean job site, and a written guarantee on every project. If something fails within 365 days, we come back and make it right at no charge. That’s not a verbal promise; it’s on paper before the first nail.
The Home Addition Contractor team at Lodgewick handles everything from a 200-square-foot bump-out to a full detached ADU. And because each location is independently owned and operated under The Kingswell Guarantee, the commitments stay in writing no matter the project size.
Sunroom Addition in Highland
A sunroom addition in Highland lets you use your large backyard eleven months out of the year without full foundation costs. Most Highland sunrooms we build run $45,000 – $90,000, depending on glass package, flooring, and whether we tie into the existing HVAC or run a dedicated mini-split.
Foundation and Slab Decisions
Highland’s sandy, low-moisture soil handles slab-on-grade sunrooms well, but only if we compact in lifts and keep the grade sloped away from planter beds. We check for settling near existing landscaping before pouring, because a sunroom slab that shifts two seasons later is a racked doorframe waiting to happen.
Glass and Heat Load
Highland summers regularly push past 95°F, so the glass package matters more than the framing. We specify low-E glazing and size the mini-split for the room’s orientation, not just its square footage. A west-facing sunroom here needs different treatment than the same room on the north side of the house.
Room Addition Contractor in Highland
A room addition in Highland, whether it’s a bedroom, office, or expanded family room, typically runs $55,000 – $140,000 depending on size and whether it’s attached or detached. We pull permits for every addition and handle the electrical panel question before it becomes a surprise change order.
Panel Upgrades and Electrical Reality
Many homes east of Palm Avenue still run original 100-amp panels. Adding a room with HVAC, lighting, and outlets almost always requires a 200-amp upgrade. We flag this at the estimate, not at permit stage, so the written price reflects reality.
Trenching in Highland Soil
Highland’s sandy soil needs sand bedding around any new conduit or utility line. We learned this the hard way early on: pipe laid directly in sandy, low-moisture soil abrades over time and leaks years later. We bed every line in sand and compact in lifts before backfilling.
On a ranch near Baseline and Palm, our crew trenched a new 100-amp subpanel to a detached ADU, replacing the original 1978 panel before inspection. We held the trench open an extra day to pass underground conduit through a sandy soil pocket, then backfilled and compacted so the new concrete walk wouldn’t crack within the first year.
Trusted Brands We Service in Highland
We work with established prefab and panelized brands including Boxabl, Cover, and Dvele, matched to your lot, budget, and timeline. For Highland’s large-lot detached units, prefab can shave weeks off framing and cut weather delays during the hot summer stretch. We coordinate the site work, foundation, utilities, and finish trades around the manufacturer’s delivery schedule so the pieces fit together without a three-week gap in the middle.
Common Home Addition Contractor Problems We See in Highland Homes
- Skipping the 100-amp panel upgrade. The ADU’s HVAC and appliances end up on an aging main, and breakers trip during Highland’s 95°F+ summer afternoons. We won’t sign off on that.
- Reusing an original slab without checking for settling near planter beds. Racked doors and cracked tile show up within two seasons. We inspect the slab edge before we commit to reusing it.
- Trenching utilities without sand bedding. Highland’s sandy soil abrades pipe over time, causing leaks years after the job is done. Our trench details are written into the scope.
- Building under the 1,200 sq ft ADU cap without a site plan. Highland’s large lots invite bigger units, but the cap is firm. We survey and stake the footprint before drawings go to the city.
Pricing for Home Addition Contractor in Highland, CA
Here’s what we see in Highland’s current market:
- Sunroom addition: $45,000 – $90,000
- Room addition (attached): $55,000 – $140,000
- Detached ADU (under 1,200 sq ft): $120,000 – $240,000
- Garage conversion: $45,000 – $95,000
- 100-amp to 200-amp panel upgrade: $2,800 – $4,500
The panel upgrade is the line item Highland homeowners least expect. If your home east of Palm Avenue still has the original 100-amp panel, budget for it. We include it in every written estimate where it applies, so the number you approve is the number you pay. Call (831) 292-4191 for a free, written estimate on your specific addition.
We Also Serve Cities Near Highland
Our crews serve Highland and the surrounding communities, including Rialto, Riverside, Calimesa, and Fontana. If your lot sits right at the city line, call us and we’ll confirm coverage for your street.
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 Home Addition Contractor in Highland
Not every addition, but most. Homes east of Palm Avenue with original 100-amp panels almost always need a 200-amp upgrade once you add HVAC, lighting, and outlets for a new room or ADU. We include the upgrade in our written estimate when it applies, so it doesn’t become a permit-stage surprise. Call (831) 292-4191 and we’ll check your panel during the free estimate.
Sometimes, but only if the slab edge shows no settling and the soil underneath is stable. We check slabs near planter beds carefully, because Highland’s sandy soil shifts more than homeowners expect. If we reuse your slab, we’ll write that into the scope and stand behind it under the 365-Day Done Right Promise.
Because the summers aren’t. Highland regularly hits 95°F+, and R-38 attic insulation is what keeps your cooling bill from doubling and your HVAC from running nonstop. It also meets current California energy code for additions, which means your permit inspection passes without a re-work order.
Lot size. Highland’s single-family parcels commonly run 7,200+ sq ft, leaving room for a detached ADU up to the city’s 1,200 sq ft cap. San Bernardino’s lots run tighter, so garage conversions and attached additions make more sense there. In Highland, a detached unit is usually the better play for resale and privacy.
It depends on the setback and where your existing lines run. Side-yard additions often cross gas or sewer easements, and Highland’s building department will flag any conflict at plan check. We pull plans and check easements before you commit, so nothing moves unless it actually has to. Call (831) 292-4191 and we’ll walk your lot with you.
Ready for a real number? Call (831) 292-4191 for a free estimate on your Highland addition. A live person answers, 24/7, and we’ll schedule a time to walk your lot, check your panel, and write down a price you can actually plan around.
Written by Russ Delmar, Owner at Lodgewick ADU Riverside, serving Highland since 2010.
