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 Perris
Adding square footage to your Perris home usually costs between $160 and $320 per square foot for site-built work, while a prefab addition from brands like Abodu or Dvele lands in the $220 to $380 per square foot range once site prep, utilities, and foundation are included. A 400-square-foot primary suite addition on a typical Perris lot runs roughly $85,000 to $140,000 all in. Those numbers include plans, permits, plan check, materials, labor, and the inspections Perris requires before you can legally occupy the new space. Call (903) 568-7222 and we’ll put a written price in front of you before any work starts.
We know Perris. We know the flat lots, the older agricultural parcels off Perris Boulevard and Nuevo Road, the neighborhoods around Lake Perris, and the way the Building Division reviews addition plans. That matters when you’re about to spend six figures on your home. A contractor who’s never pulled a Perris building permit doesn’t know what triggers a correction letter, and every correction letter adds weeks.
Benson ADU Builders is part of the Relay Home Co. family, founded 2006, and we’ve built our whole process around one idea: you should know the price and the plan before you commit. Written price before work starts. Background-checked, uniformed technicians on site. A live person answers when you call, 24/7. And every project carries our 365-Day Done Right Promise in writing.
Why Benson ADU Builders Is Perris’s Preferred Home Addition Contractor Company
Perris homeowners call us because we don’t do verbal estimates that drift. We do written, line-item pricing that you can take to another contractor and compare. Most can’t match it, not because the price is low, but because most contractors won’t put their number in writing at all until they’re three weeks into planning.
Our crews work Perris every week. We’ve pulled permits for additions on Evans Road, over by the Perris Auto Speedway, and in the newer subdivisions around Ethanac Road and Rider Street. That local reps-and-inspections experience matters more than people think. Perris plan check has specific requirements around lot coverage and unpermitted existing structures that trip up out-of-town general contractors constantly.
We’ve built our reputation in Perris one addition at a time. Homeowners here tend to research heavily before calling, and they ask sharp questions about setbacks, soil, and unpermitted patios. We answer all of them in plain English. We also stock the materials our Perris jobs use most often, which means less waiting on backordered cladding or prefab panel deliveries when your project is mid-stream.
Led by Troy Eastman, our team coordinates scheduling and dispatch from the brand’s Inland Empire office in the Riverside-San Bernardino area, and crews serve Perris locally. Every technician who walks onto your property is background-checked and in uniform. Every job gets a written guarantee. Every bill is paid by link, with photo documentation of the work along the way.
Sunroom Addition in Perris
A Sunroom Addition in Perris typically runs $45,000 to $90,000 for a properly permitted, insulated space on a new slab, with James Hardie siding and a roof tie-in that meets current California energy code. The first thing we tell Perris homeowners is that an enclosed patio built in the 1970s or 1980s is not a sunroom, and it’s usually not permitted. Scoping your new sunroom addition off that old slab is a fast way to get a plan-check correction, because the Riverside County Assessor’s record shows the old patio as either nonexistent or part of the original footprint. We pull the Assessor’s record before we draw anything.
For Perris specifically, sunrooms make a lot of sense. The flat lots leave room to expand at grade, and the desert climate means you want a space that captures winter sun without turning into an oven in August. We spec low-E glazing and proper roof ventilation as standard on Perris sunroom projects, not as upgrades.
Permit realities for Perris sunrooms
Perris treats a conditioned sunroom as living space, which means it counts toward your lot-coverage cap. If you’re on an older agricultural parcel, that number can be tighter than you’d think. We calculate coverage before we quote, and we flag any unpermitted structures that already eat into your allowance.
What a fixed-price sunroom quote actually covers
Our written price includes the slab or raised foundation, framing, glazing, roof tie-in, electrical, insulation, drywall, paint, and all plan check and permit fees for Perris. The only things that change the number are conditions we can’t see until we open something up, and we tell you what those triggers are before we start, not after.
Second Story Addition Contractor in Perris
A Second Story Addition Contractor in Perris should start every conversation with a structural check and a soils question, because a second story roughly doubles the load on your existing foundation. Perris sits on sandy former-farm soil in many areas, and a two-story addition usually requires a soils report and often some foundation reinforcement. Expect a second-story addition in Perris to run $220 to $380 per square foot depending on whether you’re going up over an existing wing or building over a garage. That range assumes a full permit set, structural engineering, and a tie-in that doesn’t turn your house into a patchwork.
Going up instead of out is often the smarter move in Perris, especially on smaller lots where expanding at grade would eat into the backyard or push against setback limits. We’ve designed second-story additions for homes near the lake and for older homes around downtown where the lot is long but narrow. The biggest variables are the condition of the existing walls and foundation, and whether the original truss layout can carry a second floor without a beam retrofit.
Load paths and existing framing
We bring in a structural engineer on every second-story project. It’s not optional. The engineer looks at your existing footings, the way the first-floor walls carry load, and what the Riverside County code requires for seismic reinforcement. In Perris, where shake risk is real, the piece of mind comes from knowing the calcs were actually run.
Living through a second-story build
You can usually stay in the house during the framing phase. The noisy part is the roof cut-in, which happens fast but is loud. We sequence the work in phases and give you a calendar before demo starts, so you know when your kitchen will be out of commission and when the new space gets weather-tight. The whole project, from permit submittal to final inspection, usually runs four to seven months for a full second-story addition in Perris.
Trusted Brands We Service in Perris
We’re authorized to build with Abodu, Cover, and Dvele, three prefab brands Perris homeowners often ask about after seeing them online. Prefab can shorten on-site construction time significantly, since wall panels and even whole modules arrive factory-built. We also standardize on James Hardie fiber cement siding for site-built additions because it holds up to Perris heat and the occasional Santa Ana wind without warping or fading the way vinyl does. Because we work these brands regularly, our Perris customers don’t sit in a long order queue. We know lead times, we know the foundation details each brand requires, and we know what the site work and utility connections actually cost on top of the factory price. That last part matters, because the catalog price is never the full picture.
Common Home Addition Contractor Problems We See in Perris Homes
- Unpermitted enclosures eating lot coverage. Homes built before the 1980s often have a patio or sunroom that was enclosed without permits. It’s not on the Assessor’s record, and it can push your lot coverage over Perris’s 50% cap. We catch this before submittal by pulling the Assessor’s parcel record.
- Sandy former-farm soil surprising the foundation. Perris land was agricultural long before it was residential. Soil conditions vary block by block, and a contractor who skips the soils report ends up over-excavating or under-sizing the pad, then hands you a change order mid-build. We price soil testing into the plan from day one.
- Prefab quotes that skip site work. A pre-engineered design from Boxabl, Abodu, or Plant Prefab is not a fixed-price finished project. The factory price doesn’t include the foundation, utility trenching, or connection fees that Perris requires. We quote the whole delivered-and-permitted project so you can compare honestly.
- Boundary confusion on old agricultural parcels. Perris sits over a patchwork of former farm parcels and unrecorded easements. If your lot line isn’t clearly monumented, Perris Building Division will push back on the submittal until a boundary survey is done. We recommend the survey early so it doesn’t stall your permit.
Pricing for Home Addition Contractor in Perris, CA
Site-built additions in Perris run $160 to $320 per square foot. The low end covers simple bump-outs and single-room additions with basic finishes. The high end covers second-story work, foundation reinforcement, and premium materials. Prefab additions from our brand partners run $220 to $380 per square foot delivered and permitted, including the foundation and utility connections. Sunroom additions run $45,000 to $90,000 for a conditioned, code-compliant space. A primary suite addition runs $85,000 to $140,000. What moves the number in Perris specifically: soil conditions, whether an existing structure is unpermitted, how close the addition sits to your property line, and whether the addition triggers a panel upgrade or septic rework on older parcels off city sewer. We’ll give you a written price before anything starts, and if a condition arises mid-build that changes the number, you’ll approve it in writing before we do the work. Call (903) 568-7222 for a free estimate and an honest walkthrough of your lot.
We Also Serve Cities Near Perris
We work throughout the Inland Empire, from Perris to the surrounding communities. If you’re in Moreno Valley, Lake Elsinore, Menifee, or Homeland, the same written-price process applies, and the same crews cover your project. Our Home Addition Contractor team handles everything from single-room additions to full second-story builds. One call to (903) 568-7222 gets you scheduled anywhere in the 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 Home Addition Contractor in Perris
On many older Perris parcels, especially former agricultural land, yes, you need a boundary survey. If your lot lines aren’t clearly monumented or the Assessor’s parcel map conflicts with existing fencing, Perris Building Division won’t accept your submittal until a licensed surveyor confirms the boundaries. An old plot plan from your purchase documents usually isn’t enough. We check this before we put together your submittal so the survey doesn’t surprise you later. Call (903) 568-7222 and we’ll tell you whether your lot needs one and what it costs.
Plan check in Perris typically runs three to six weeks for a straightforward addition, longer if corrections are issued. After permit issuance, inspections are phased: foundation, rough framing, rough electrical and plumbing, insulation, and final. Each phase adds days to weeks depending on inspector scheduling. A realistic timeline for a site-built addition from signed contract to final inspection is four to seven months in Perris. Prefab can shave four to eight weeks off the on-site construction phase. Call (903) 568-7222 and we’ll lay out a real calendar for your specific project.
Yes, if it’s enclosed and conditioned, it counts toward your lot-coverage cap, even if it was built without permits. Perris caps total lot coverage at 50% for single-family residential. We pull the Riverside County Assessor record on every project and compare it against what’s actually on the property. If the old patio isn’t on the record, we correct the coverage math before submittal so the permit doesn’t get kicked back. Call (903) 568-7222 and we’ll review your parcel before you commit to a design.
The honest answer: soil surprises, unpermitted work discovered during demo, and utility work you can’t see until we dig. On Perris’s sandy former-farm soil, a foundation that needs deeper excavation or additional compaction is the most common change-order. Unpermitted wiring or plumbing inside an old patio enclosure is another. We document every change in writing with the new price before we proceed, so you’re never billed for something you didn’t approve. Call (903) 568-7222 and we’ll walk you through the specific risk factors on your lot.
Yes, and it’s often the better choice on smaller or narrower Perris lots. A second-story addition keeps your backyard intact and avoids setback issues that come with expanding outward. The tradeoff is cost: $220 to $380 per square foot, plus the structural engineering and possible foundation reinforcement. We bring a structural engineer in on every second-story project, and we’ll tell you before you sign whether your existing foundation can carry the load without a major retrofit. Call (903) 568-7222 for a free assessment of your lot and structure.
Get a Written Price for Your Perris Home Addition
Before you talk to any other contractor in Perris, talk to us. We’ll review your lot, your Assessor’s parcel record, and your goals, then hand you a written price that includes plans, permits, inspection fees, materials, and labor. No ballpark, no handshake estimate that moves once the project starts. A real number on paper, backed by our 365-Day Done Right Promise and a written guarantee on the whole project. Call (903) 568-7222 now to schedule your free estimate. Troy Eastman and the Benson ADU Builders team are ready when you are.
Written by Troy Eastman, Owner at Benson ADU Builders, serving Perris through the Relay Home Co. family, founded 2006.
