A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateADU Company in Covina, CA
Adding an ADU or home addition in Covina comes down to three things most builders won’t tell you upfront: your lot’s setback rules (the required gap between a new structure and the property line), your home’s age and framing condition, and whether your project triggers a hillside or flood-zone review. We’re Sutton ADU Builders, and we handle all three before you spend a dime. If you’re weighing a detached ADU, garage conversion, or room addition in Covina, call (472) 248-8213 and we’ll walk you through what your specific lot can actually support.
Why Covina Homes Are Different
Covina’s housing stock skews older than people expect, with a large share of single-family homes built between the 1940s and 1970s. That matters for ADU work because older framing, pre-1980 electrical panels, and clay-heavy soil all change how a foundation gets laid and how a new structure ties into the existing house. We see this constantly in the neighborhoods north of Badillo Street and around Charter Oak, where mid-century ranches sit on generous lots that look perfect for a detached unit, until you check the utility easements.
Covina also sits at the base of the San Gabriel foothills, and the grade changes more than people realize. A lot that looks flat from the curb can drop 2 to 3 feet across the back, which shifts your foundation approach from a slab to a stem wall or pier system. That’s a real cost variable, and we explain it before you commit, not after we start digging.
Our Main Covina Services
The three services Covina homeowners call us about most often are home additions, ADU construction, and room additions. Each has its own page below, with local pricing and the specific conditions we see across Covina.
Home Addition Contractor in Covina
A home addition in Covina usually means expanding a kitchen, adding a primary suite, or extending the living area into the backyard. Many Covina homes from the 1950s and 1960s have load-bearing walls that were never designed for an open floor plan, so we frequently specify engineered beams and footings sized for local soil conditions. We’ll also check whether your addition triggers a school district fee or a sewer lateral requirement, and we handle the permit package through the City of Covina. For the full breakdown, see Home Addition Contractor in Covina.
ADU Builders in Covina
Detached ADUs are the most common project we build in Covina, especially in the neighborhoods south of the 10 freeway and up toward Lone Hill. The typical detached unit runs 400 to 800 square feet, and Covina’s setback requirements often dictate whether you can place it in the rear yard or along the side yard. We work with both stick-built and prefab systems, including Abodu and Cover, and we’ll tell you plainly which one makes sense on your specific lot. Details on pricing and permitting are on the ADU Builders in Covina page.
Room Addition Contractor in Covina
A room addition is the most cost-effective way to add livable square footage when you don’t want a separate kitchen or bath. In Covina, the most common requests are a fourth bedroom, a home office, or a ground-floor suite for an aging parent. These jobs often require tying new footings into existing foundations that have settled over decades, and we check for that before we quote. See Room Addition Contractor in Covina for typical room addition ranges and what to expect.
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 Covina
We work regularly with James Hardie cladding systems, Abodu and Cover prefab ADU models, and Dvele modular designs. We know which ones clear California building codes fastest and which hold up best in Covina’s dry, hot summers. See our brands for the full list and how we source parts.
Pricing for ADU Company in Covina, CA
| Service | Typical range in Covina |
|---|---|
| Detached ADU, 400 – 600 sq ft | $180,000 – $260,000 |
| Detached ADU, 600 – 800 sq ft | $240,000 – $320,000 |
| Garage conversion ADU | $110,000 – $170,000 |
| Prefab ADU (Abodu/Cover), site work included | $190,000 – $280,000 |
| Home addition, 200 – 400 sq ft | $90,000 – $160,000 |
| Home addition, 400 – 800 sq ft | $150,000 – $280,000 |
| Primary suite addition | $130,000 – $220,000 |
| Room addition, single room | $65,000 – $110,000 |
| Foundation upgrade (stem wall on grade change) | $15,000 – $35,000 |
| James Hardie siding, full exterior | $28,000 – $55,000 |
The two things that push Covina prices up most are slope and soil: a rear yard with a 3-foot grade change adds foundation cost, and expansive clay in parts of the city can require deeper footings. Whatever your lot looks like, you get a written price before any work begins, and that number does not change unless you change the scope. No surprises on the final invoice.
Neighborhoods We Serve in Covina
We work across the entire city, including the established streets around Charter Oak, the mid-century ranch homes north of Badillo, the hillside lots near Lone Hill, and the quiet pockets around Covina Park and the downtown area. Most Covina jobs are within a 20-minute drive for our local crews.
- Charter Oak
- North Covina (Badillo corridor)
- Lone Hill and hillside lots
- Downtown Covina
- South Covina (below the 10)
Service Area – Cities Near Covina
If you’re just outside Covina, we also serve Azusa, CA, West Covina, CA, Baldwin Park, CA, and Glendora, CA. The same written-price promise and Threshold Verified crew standards apply everywhere we work.
Serving Covina, CA - Our Local Coverage Area
We’re based in the Covina 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 Covina
Most Covina addresses are within 20 minutes of our local crews, and we schedule site visits in a 2-hour window so you’re never waiting around all day. Every technician’s name and photo is sent to you before they arrive. Call (472) 248-8213 to set up a visit.
Yes, every ADU, addition, and room addition in Covina requires a building permit through the City of Covina. We prepare the permit package, submit it, and handle any corrections. Estimates are free, so call (472) 248-8213 if you want to know what your project will involve.
No. The written price you get before construction is the price you pay, unless you ask us to change the scope. The 365-Day Done Right Promise covers workmanship for one full calendar year from completion. Call (472) 248-8213 for a fixed-price quote.
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 Covina Customers Say
"Every crew member was vetted and carried a badge, which matters when they are around your family for months. Tidy site every day."
- Daniel F."Itemized estimate with allowances laid out. Final cost was within a hair of the quote."
- Naomi R."Backyard ADU for my mother. The project manager showed ID and walked me through the permit steps, the foundation plan, and the schedule. Moved her in on time."
- Margaret C.
