A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateADU Company in Perris, CA
Benson ADU Builders handles ADUs, home additions, and room additions across Perris, CA. Most Perris projects we price fall between $160,000 and $320,000 for a detached ADU, with home additions typically running $140 to $320 per square foot depending on foundation work, site access, and finish level. The big local variable here is soil: Perris sits on expansive clay that shifts with moisture, so foundation design matters more than it does in coastal cities. Call (903) 568-7222 any time and a live person will talk through your project and get a written price in front of you.
Why Perris Homes Are Different
Perris housing stock trends newer than Riverside’s older core, with a lot of construction from the late 1990s through the 2010s. That means most lots are already graded and most slabs are post-tension concrete, which changes how we tie a new ADU foundation to the existing home. Lots in the May Ranch and Villages of Avalon areas tend to be wider and flatter, which favors a slab-on-grade prefab panel ADU. Older pockets near downtown Perris, closer to D Street and Perris Boulevard, often have smaller lots with setback constraints that make a compact one-bedroom or a JADU conversion of an existing garage the smarter play.
The climate is a real factor too. Perris summers regularly push past 100 degrees for weeks, so we spec higher R-value insulation and a mini-split HVAC system sized for peak heat, not just square footage. The wet winters, when they come, put pressure on drainage. We check lot slope and soil drainage on every Perris site walk because a poorly drained perimeter can cause slab movement within a few seasons. Homeowners adding an ADU for rental income in Perris also have to account for the city’s permit process, which follows Riverside County building codes and California Title 24 energy standards. We pull all permits and manage the inspections as part of every project.
Our Main Perris Services
Perris homeowners call Benson for three things more than anything else: building a new ADU, expanding the main house, and adding a single room. Each has its own Perris page with pricing and details.
ADU Builders in Perris
A detached ADU in Perris is usually a 400 to 1,200 square foot structure placed in the rear or side yard. We build both site-built and prefab ADUs here, and the choice usually comes down to lot access and timeline. A wider lot off Evans Road can accept a prefab panel delivery without drama; a tighter lot near the 215 corridor may need stick framing. Perris setback rules follow California state ADU law, which allows a 4-foot side and rear setback for most detached ADUs, but front-yard setbacks still apply, so placement matters. Our ADU Builders in Perris page breaks down pricing, timelines, and the exact process we follow from first site visit to final inspection.
Home Addition Contractor in Perris
A home addition in Perris means expanding the footprint of the existing house, usually a bedroom suite, a larger kitchen, or a family room bump-out. These projects tie into the existing foundation and roofline, which is where Perris soil conditions come back into play: we evaluate the existing slab, check for any prior movement, and design the connection so the new section settles with the old one rather than against it. Our Home Addition Contractor in Perris page walks through the permitting, the structural work, and what a realistic budget looks like for additions in this city.
Room Addition Contractor in Perris
A room addition is the smaller sibling: one room, often 150 to 400 square feet, built off an existing wall and roof. In Perris we do a lot of ground-level additions because most homes here are single-story on slab. That simplifies the structure but raises the floor-height conversation, since Perris gets genuine heat and occasional driving rain. We match the existing floor elevation, insulate properly, and tie into the current HVAC or add a ductless split. See Room Addition Contractor in Perris for a full breakdown of what a single-room addition costs and how long it takes.
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 Perris
We build with and service ADUs from Abodu, Cover, Dvele, and James Hardie cladding systems across Perris. Panels and finish materials are coordinated through our Inland Empire office, so lead times stay short and homeowners can research every product themselves before committing. See our brands for the full range of what we install.
Pricing for ADU Company in Perris, CA
| Service | Typical range in Perris |
|---|---|
| Detached ADU (400-800 sq ft, prefab panel) | $160,000 – $280,000 |
| Detached ADU (800-1,200 sq ft, site-built) | $250,000 – $380,000 |
| Garage conversion to ADU (JADU) | $90,000 – $150,000 |
| Home addition (300-600 sq ft) | $140 – $220 per sq ft |
| Home addition (600-1,000 sq ft) | $160 – $260 per sq ft |
| Primary suite addition | $110,000 – $200,000 |
| Kitchen expansion | $80,000 – $160,000 |
| Room addition (150-400 sq ft) | $120 – $210 per sq ft |
| Foundation and soil corrections | $8,000 – $35,000 |
| Utility trenching and hookups | $6,000 – $22,000 |
What pushes a Perris price up is usually soil: expansive clay under an older slab can require deeper footings or a pier foundation, and that adds cost before walls ever go up. The other big variable is site access, especially on flag lots or homes with narrow side yards where equipment has to travel by hand. Every Benson quote is a written line-item price before work starts, so the number you approve is the number you pay.
Neighborhoods We Serve in Perris
We run ADU and addition projects throughout Perris, including the newer subdivisions and the older central blocks. Our crews are in the area every week, and we typically schedule site visits within a few days of your call.
- May Ranch
- Villages of Avalon
- North Perris
- Downtown Perris
- Lake Perris area
Service Area – Cities Near Perris
While this page covers Perris specifically, Benson ADU Builders also works in surrounding Riverside County communities. If you’re a few miles out, we likely cover you too: Moreno Valley, CA, Lake Elsinore, CA, Menifee, CA, and Homeland, CA are all within our regular service area.
Serving Perris, CA - Our Local Coverage Area
We’re based in the Perris 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 Perris
We typically get a team member out to a Perris property within two to four business days of your call. Scheduling is coordinated through our Inland Empire office, and you’ll get a confirmed arrival time before we come out.
Yes. Benson pulls all permits through the City of Perris or Riverside County, whichever has jurisdiction for your address, and we manage every inspection until final sign-off. You don’t chase paperwork, we do. Call (903) 568-7222 and we’ll confirm what your specific address requires.
We do. Perris has a mix of HOA communities and older lots with no HOA at all, and the approach changes accordingly. We review setback rules, lot coverage limits, and any architectural guidelines during the site visit, then design to fit. Call (903) 568-7222 to schedule a free estimate and we’ll tell you exactly what your property allows.
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 Perris Customers Say
"Booked a consult online and met the project manager two days later. Weekly progress updates arrived by text with photos. ADU finished on schedule."
- Hannah W."Clean, quiet crew. They respected the neighbors, kept noise to working hours, and swept the driveway every evening."
- Hope C."Communication was the best part. I always knew what was happening that week without having to ask."
- Dolly N.
