Fast, Reliable Home Addition Contractor Across Highgrove
Adding square footage to a Highgrove home usually runs $180 – $420 per square foot depending on whether you’re building out, building up, or converting existing space. That range puts a typical 400-square-foot room addition at roughly $72,000 – $168,000 here, with second-story work landing at the higher end because of structural reinforcement and stair integration. We’re Lodgewick ADU Builders, the Home Addition Contractor team that works throughout Highgrove, and we put every price in writing before the first wall comes down. If you’re weighing a room addition, bump-out, or full second story, call (254) 602-5618 and we’ll walk the property with you, no charge.
Why Lodgewick ADU Builders Is Highgrove’s Preferred Home Addition Contractor Company
Highgrove homeowners deal with something most contractors never mention: this is an unincorporated community, so every addition permit runs through Riverside County Planning and Riverside County Building and Safety as two separate submissions. Miss one and a project stalls for weeks. We handle both filings for you, and we’ve done it enough times to know what each department flags on older Highgrove homes.
We’re the ADU and addition company of the Kingswell family, established in 2010, and Russ Delmar leads our crews. Every project operates under The Kingswell Guarantee: a written price before work begins, a defined arrival window, a clean job site every day, and a written guarantee on the finished build. If something isn’t right within 365 days, we come back and make it right, free. That’s the 365-Day Done Right Promise, and it’s in writing on every contract.
Homeowners off Center Street, along Barton Road, and up toward the Grand Terrace border call us because a live person answers the phone around the clock. Not a voicemail loop. When you have a question about your addition at 9 p.m., you get a person.
Room Addition Contractor in Highgrove
A Room Addition Contractor in Highgrove builds new conditioned living space onto an existing home, typically a ground-floor extension with foundation, framing, roofing, electrical, and finish work tied into the original structure. Most Highgrove projects we take on are 300 – 600 square feet and run $65,000 – $190,000 depending on finish level, site access, and what the existing walls reveal when we open them.
What We Find Behind Highgrove Walls
Most Highgrove housing stock dates from the 1940s through the 1970s, built on old citrus-farming parcels. That means generous lot sizes, which is good. It also means cloth-wrapped wiring, galvanized plumbing, and 100-amp panels that are already maxed out. A cosmetic bid that skips this reality is a bill waiting to surprise you. We inspect first, write allowances into the contract, and price any discovery in writing before we touch it.
Permit Handling on Addition Work
Highgrove has no city hall. Your addition needs zoning clearance from Riverside County Planning and a construction permit from Riverside County Building and Safety, two separate offices with no shared portal. We file both, coordinate the inspections, and keep the schedule moving so you’re not the one chasing county departments.
Second Story Addition Contractor in Highgrove
A Second Story Addition Contractor in Highgrove builds up instead of out, adding a full or partial upper level over an existing single-story home. This is the right call when your lot is already filled or you want to preserve yard space, and it runs $250 – $450 per square foot here, so a 500-square-foot upper addition typically lands between $125,000 and $225,000.
Structural Reality on 1940s – 70s Framing
Second-story work in Highgrove means we’re loading new weight onto framing that’s 50 to 80 years old. Many of these homes have undersized headers and top plates that were fine for one story and marginal for two. We engineer the load path, reinforce as needed, and show you the written change order before a single existing wall is modified.
Building Through Highgrove Summers
The San Bernardino Valley heat dome pushes Highgrove past 100°F regularly from June through September. That shapes how we sequence second-story framing, roofing, and stucco. West- and south-facing walls get radiant-barrier sheathing and expansion-joint detailing so the stucco doesn’t crack during those wide daily temperature swings that dry out everything.
Trusted Brands We Service in Highgrove
When a Highgrove project calls for a prefabricated component or a specific cladding system, we work with brands we know well. Dvele panels come up often for second-story additions where off-site framing cuts on-site build time during summer heat. Cover and Boxabl make sense when a homeowner wants a detached addition with factory precision. And James Hardie siding is our default exterior on most room additions here because it handles the dry heat and UV exposure better than wood lap. We know these systems, we know their lead times, and we don’t experiment on your project.
Common Home Addition Contractor Problems We See in Highgrove Homes
- Cloth or aluminum branch wiring behind the walls. Homes built from the 1940s into the early 1970s here often still carry original wiring that’s no longer safe to extend. When a permit inspection catches it, you’re adding an electrical upgrade whether or not your original bid included one.
- Undersized 100-amp panels already at capacity. Adding a 400-square-foot room with its own HVAC, lighting, and outlets frequently pushes these panels past their rated load. The fix is a panel upgrade, priced in writing, before the drywall goes up.
- Dry-rotted top plates and failed waterproofing at the tie-in. The stucco looks fine from outside. When we open the wall, the framing underneath tells a different story. Decades of poor flashing and Highgrove’s rare but intense winter rains rot the lumber at exactly the point where the new addition connects.
- The two-department permit stall. An owner clears Riverside County Planning and assumes they’re permitted. They’re not. Building and Safety requires its own submission, and neither office tells the other. We file both at the same time, which is the only way to avoid losing weeks.
Pricing for Home Addition Contractor in Highgrove, CA
Here’s what you can expect in Highgrove, with real numbers:
- Ground-floor room addition: $180 – $320 per square foot, so a 400-square-foot addition lands around $72,000 – $128,000
- Second-story addition: $250 – $450 per square foot, with structural reinforcement and stairs typically pushing a 500-square-foot project to $125,000 – $225,000
- Bathroom addition: $45,000 – $90,000 for a full bath with new plumbing runs
- Sunroom addition: $35,000 – $80,000 depending on whether it’s conditioned space or three-season
- Bump-out addition: $40,000 – $95,000 for 100 – 300 square feet that expands an existing room
- Electrical panel upgrade (if the addition triggers one): $2,500 – $6,000
No contractor can price your project accurately without opening the walls or at least inspecting the panel and attic framing. That’s why our quotes are free, written, and based on a real site visit. Call (254) 602-5618 and we’ll give you numbers you can actually plan around.
We Also Serve Cities Near Highgrove
Our crews work throughout the Inland Empire and into Highgrove‘s neighboring communities. We run additions in Los Angeles, Long Beach, Anaheim, and Riverside, which means we’re already familiar with the building departments, inspectors, and housing stock around you. Dispatch and scheduling are coordinated from our Los Angeles office; crews serve Highgrove locally.
Serving Highgrove, CA - Our Local Coverage Area
We’re based in the Highgrove 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 Highgrove
No, because Highgrove is not a city. It’s an unincorporated community governed by Riverside County, so every addition requires a zoning clearance from Riverside County Planning and a separate construction permit from Riverside County Building and Safety. We file both submissions at once so neither stalls the project. Call (254) 602-5618 and we’ll walk you through the exact documents your parcel needs.
In homes built from the 1940s through the 1970s, the most common discoveries are cloth-wrapped or aluminum wiring, a 100-amp panel at capacity, or dry-rotted top plates hidden behind stucco. A permit inspection flags these, and the correction is mandatory before work continues. We handle this differently: our quotes include written allowances for electrical and framing unknowns, and any change is priced and approved by you in writing first. That’s the only honest way to quote old construction. Call (254) 602-5618 for a free estimate that accounts for what might be behind your walls.
Yes, and many Highgrove homeowners do, especially on lots that still have generous yard space but a layout better suited to going up. The structural engineering matters more on second-story work because you’re loading new weight onto framing that’s 50 to 80 years old. We reinforce the load path, handle the county inspections, and build through the summer heat without cracking the stucco. Call (254) 602-5618 and we’ll assess your existing framing at no cost.
Highgrove regularly exceeds 100°F in summer, so we sequence framing, roofing, and stucco work to avoid the hottest hours, use radiant-barrier sheathing on west- and south-facing walls, and detail expansion joints so the wide daily temperature swings don’t crack exterior finishes. The right HVAC sizing matters too: a room addition without an independent mini-split will be functionally unusable for months of the year. We size and install the HVAC to match the added square footage. Call (254) 602-5618 for a written plan that accounts for Highgrove’s climate, not a generic one.
We fix what the inspector flags, schedule the re-inspection, and keep the project moving. Because we handle both Riverside County Planning and Building and Safety ourselves, we know what each inspector looks for on Highgrove’s older housing stock and we build to pass the first time. If something does fail, you’re not the one managing the correction. Our written guarantee covers the work we install, and we stand behind it. Call (254) 602-5618 to talk through your project.
The Two-Department Permit Path Every Highgrove Addition Faces
Here’s the reality that surprises most Highgrove homeowners, especially those who compare notes with neighbors in Grand Terrace or Riverside. Because Highgrove is unincorporated, your addition has to pass through two separate county sign-offs: Riverside County Planning issues a zoning clearance confirming your addition fits within setback and lot-coverage rules, and Riverside County Building and Safety issues the actual construction permit. These two offices do not share a counter, a phone queue, or an online portal. If you clear one and forget the other, your project sits. Weeks pass. Materials sit in your yard. This dual-department path is unique to Highgrove, and we’ve seen it stall projects that were otherwise ready to start.
What Opening a Highgrove Wall Actually Turns Up
The single biggest unknown on a Highgrove addition isn’t what you’re adding, it’s what’s already in your walls. On a 1960s ranch off Cedar Street, our crew opened the rear wall for a room addition and found cloth-wrapped wiring and a 100-amp panel already at capacity. We paused, priced a panel upgrade plus modern circuits in writing, and only cut further after the homeowner approved. Then came the undersized, dry-rotted top plates at the addition tie-in, which we reframed with new lumber after a written change order. The permit triggered a full electrical and framing inspection, and because we handle both the county Planning clearance and the Building and Safety sign-off ourselves, the schedule didn’t slide. That’s how a real addition quote works: inspection first, allowances written into the contract, and any surprise priced and approved in writing before we touch it. A contractor who bids only the cosmetic addition isn’t doing you a favor, they’re handing you a bill you haven’t seen yet.
Written by Russ Delmar, Owner at Lodgewick ADU Builders, serving Highgrove and surrounding communities.