ADU Company in Highgrove, CA
Adding an ADU in Highgrove means something different than it does in a nearby incorporated city, because every permit runs through two separate Riverside County departments rather than one city hall. The lots here are larger than most of the Inland Empire, a holdover from the citrus-farming days, which makes detached ADUs more practical than they are on tighter postwar lots in Riverside or Grand Terrace. Add the year-round rental demand from UC Riverside, and an ADU in Highgrove often pencils out better than almost anywhere else in the region. We’re Lodgewick ADU Builders, and we can help you figure out what’s possible on your specific parcel. Call (254) 602-5618 to start that conversation.
Key takeaways:
- Highgrove ADU permits are handled by Riverside County Planning and Building & Safety, not a city hall.
- Many Highgrove lots are oversized, originally carved from citrus groves, meaning detached ADUs fit more often than nearby.
- Summer heat here demands a properly sized, independent HVAC system in any ADU.
- Written pricing before work starts, on every project, no exceptions.
Why Highgrove Homes Are Different
Highgrove is an unincorporated community, not a city, and that changes how ADU projects actually get approved. Homeowners who compare notes with friends in Riverside or Grand Terrace often expect one permit counter and one set of forms. Instead, a Highgrove ADU application must clear Riverside County Planning for zoning and land-use clearance, then go through Riverside County Building and Safety for the construction permit. The two departments don’t share a unified online portal or counter, so a submission sent to one while the other waits can stall a project for weeks. Russ Delmar, who leads our team, has walked enough Highgrove projects through this process to know which department needs what, and when.
The housing stock adds another layer. Most Highgrove homes were built between the 1940s and 1970s on land carved from former citrus groves, which left many parcels oversized by Inland Empire standards. That’s good news for a detached ADU. The less good news: older homes here commonly have 100-amp electrical panels and galvanized or early copper supply plumbing. Both often need evaluation, and frequently an upgrade, before an ADU can pass inspection. We flag this early so it’s part of the written price, not a surprise later.
The climate shapes a Highgrove ADU more than people expect. Summer temperatures regularly cross 100°F, and a small ADU without its own properly sized mini-split HVAC system becomes functionally unrentable for months at a time. The dry air and wide temperature swings also put real stress on exterior walls. We pay particular attention to radiant-barrier sheathing and stucco detailing on west- and south-facing ADU walls, where cracking shows up first if corners are cut. This is the kind of local knowledge that only matters because we’ve seen it repeatedly on Highgrove job sites.
Our Main Highgrove Services
Highgrove homeowners usually call us about one of three projects: adding a full home addition, converting an existing garage into living space, or building a detached or attached ADU. Each has its own page with pricing, timelines, and local specifics.
Home Addition Contractor in Highgrove
A home addition in Highgrove means working with the same oversized lots that make detached ADUs possible, but with different trade-offs. Many additions here attach to homes built mid-century, which means matching rooflines and stucco textures across decades of construction. Some additions trigger the same 100-amp panel evaluation that ADUs do, especially if you’re adding a bedroom with its own HVAC demand. We write the full price before work starts, including the electrical upgrades, so there’s no change order at the door. Home Addition Contractor in Highgrove.
Garage Conversion Contractor in Highgrove
Garage conversions in Highgrove are the fastest path to a rentable unit on a budget, but the older housing stock matters more here than anywhere. Many garages built in the 1940s through 1970s sit on slabs that were never meant to be living space, so we check moisture, leveling, and insulation before quoting. Riverside County will also require a zoning clearance even though Highgrove has no city government, which catches some homeowners off guard. A garage conversion into a JADU (junior accessory dwelling unit) is often the most economical option on Highgrove’s smaller parcels. Garage Conversion Contractor in Highgrove.
ADU Builders in Highgrove
Building a detached ADU in Highgrove is where the community’s citrus-era lots really pay off. A backyard that once held orange trees often has enough room for an 800- or 1,000-square-foot detached unit with its own entrance, parking, and outdoor space, which rents quickly given the short drive to UC Riverside. The catch is the two-department Riverside County permitting process, and we handle that coordination as part of every ADU build. We also match homeowners with established prefab ADU manufacturers when the lot and budget call for it, including Abodu, Cover, and Dvele, so some Highgrove ADUs go from permit to move-in faster than traditional stick-built construction. ADU Builders in Highgrove.
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 Highgrove
We work regularly with several leading ADU manufacturers and material suppliers, matching each Highgrove homeowner’s lot, budget, and timeline to the right system. Abodu, Cover, and Dvele each suit different parcel shapes and foundation conditions, and we stock common components locally for faster turnarounds. See our brands for a full rundown of what we service.
Pricing for ADU Company in Highgrove, CA
| Service | Typical range in Highgrove |
|---|---|
| Detached ADU (prefab, 500 – 750 sq ft) | $180,000 – $260,000 |
| Detached ADU (site-built, 800 – 1,000 sq ft) | $240,000 – $350,000 |
| Garage conversion to JADU | $90,000 – $150,000 |
| Garage conversion to full ADU | $140,000 – $210,000 |
| Home addition (primary suite, 300 – 500 sq ft) | $120,000 – $220,000 |
| Home addition (second story, partial) | $200,000 – $350,000 |
| 100-amp to 200-amp panel upgrade | $2,500 – $4,500 |
| Galvanized plumbing replacement (full re-pipe) | $6,000 – $15,000 |
| HVAC mini-split (independent ADU system) | $5,000 – $10,000 |
| Stucco repair and radiant-barrier sheathing (per wall) | $3,000 – $8,000 |
Prices in Highgrove tend to run higher than nearby incorporated cities when a home needs an electrical panel upgrade, a plumbing re-pipe, or foundation work before the ADU can even start. The written price we give you before any work begins includes those upgrades when we can identify them during the estimate walkthrough, and it does not change unless the scope changes.
Neighborhoods We Serve in Highgrove
Highgrove’s neighborhoods follow the old citrus-parcel lines, which means block-to-block variation in lot size and access. We’re familiar with the different conditions across the community and schedule estimates with a defined arrival window, not a vague “sometime Tuesday.”
- Highgrove Heights
- Center Street corridor
- Palm Avenue area
- Iowa Avenue neighborhoods
- Spring Street area
Service Area – Cities Near Highgrove
While this page focuses on Highgrove, our crews also serve surrounding communities, including Riverside, CA, Los Angeles, CA, Long Beach, CA, and Anaheim, CA. Each city has its own permitting quirks, and we handle those 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 ADU Company in Highgrove
Yes. Highgrove has no city government, so every ADU needs zoning clearance from Riverside County Planning and a construction permit from Riverside County Building and Safety. We prepare and submit to both departments and track each one until the permit is issued. Call (254) 602-5618 and we’ll walk you through what your specific lot requires.
Often, yes. Homes built from the 1940s through 1970s commonly have 100-amp panels and galvanized or early copper plumbing, both of which may need upgrades for a new ADU. We flag these during the estimate so they’re in the written price before work starts, never as a surprise change order.
We typically schedule estimates within a few business days and give you a defined arrival window, not an all-day wait. The two-department county permitting process then adds weeks regardless of who builds, so starting the conversation early is the best way to keep your ADU timeline on track. Call (254) 602-5618 to get on the calendar.
Ready to talk about your Highgrove ADU, addition, or garage conversion? Call (254) 602-5618 for a free estimate with a written price before any work begins.
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 Highgrove Customers Say
"Built a backyard unit for my mother in law. They handled the permits, gave me a real timeline, and stuck to it within a few days. The written price is what we paid, which anyone who's done construction knows is rare."
- Dennis Fairchild"Garage conversion into a studio for our teenager. Honest about what was realistic and what wasn't, finished close to schedule, and cleaned up the site daily."
- Marcus Beaumont"I was nervous about adding on but they walked me through every step and every cost before we started. No surprise change orders halfway through like I'd heard horror stories about."
- Eleanor Pratt