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 Long Beach
Adding square footage to a Long Beach home usually costs between $160,000 and $340,000 for a detached ADU, while a garage conversion or room addition typically runs $90,000 to $180,000 before site-specific upgrades. That’s the honest range we quote before anyone lifts a tool. At Sutton ADU Long Beach, we’re led by Miles Hartwell, and our crews know the difference between a 1920s craftsman in Rose Park and a 1950s stucco box in Los Altos, because that difference changes the entire build. Call (562) 317-7042 for a free estimate.
Why Sutton ADU Long Beach Is Long Beach’s Preferred Home Addition Contractor Company
Long Beach homeowners keep calling us because we show up with a name and a face before we show up with a saw. Every Sutton technician is background-checked, identity-verified, and photo-badged under the Threshold Standard, and we send you their name and photo before they arrive. That matters when you’re letting a construction crew into a home where your kids sleep, or when you’re home alone for most of the day.
We’ve worked on ADUs and additions from Naples to Bixby Knolls, and we know which Long Beach lots trigger which code requirements. Our Home Addition Contractor team has handled garage conversions across rear alleys in Alamitos Beach, second-story additions on tree-lined streets in Belmont Heights, and bathroom additions in Spanish Revival homes near Retro Row. The workmanship carries a 365-Day Done Right Promise, written and stamped on every project. If something isn’t right within a full year, we make it right. No haggling, no fee for the second visit.
Dispatch and scheduling are coordinated from the brand’s Los Angeles office, but crews serve Long Beach locally. That means your estimate comes from someone who has actually stood on a Long Beach lot, not a call center reading a script.
Garage Addition Contractors in Long Beach
Garage Addition Contractors in Long Beach do a lot of work on detached garages built between 1910 and 1940, many of them carriage houses that open onto rear alleys. In central Long Beach, the city’s “alley-loaded lot” interpretation allows zero-lot-line setbacks for garage ADUs, which is a condition you rarely see in neighboring Los Angeles. That means more of your lot becomes buildable square footage, but it also means the foundation, drainage, and framing details have to be dialed in precisely. A detached garage conversion in Long Beach typically runs $110,000 to $175,000, depending on how much of the original structure can be saved.
Alley-Facing Garage Conversions
Alley-facing garage ADUs in Long Beach often share a property line with the alley itself, which changes how we handle moisture and hardware. Salt air from the marine layer corrodes standard exterior hardware within the first year, so we spec marine-grade stainless or powder-coated aluminum on alley-facing doors and windows. We also address drainage before framing, because water from the alley tends to pool against the slab in flat-lot areas.
Garage-to-ADU Code Upgrades
Opening up a 1920s garage in Long Beach frequently reveals knob-and-tube wiring, rotted sill plates, and slabs poured without vapor barriers. On a Rose Park craftsman near 7th Street, our crew opened a detached garage and found live knob-and-tube in the rafters plus a rotted sill plate where the alley-side wall met the slab. We rewired to current code, replaced the framing with pressure-treated lumber, and added a moisture barrier before closing up. Permit inspections passed on the first visit.
Bathroom Addition Contractor in Long Beach
Bathroom Addition Contractor work in Long Beach usually means adding a full bath to a home that has one bath for three bedrooms, a common condition in pre-1950s bungalows across the city. A bathroom addition in Long Beach typically runs $35,000 to $65,000 when it ties into existing plumbing, and closer to $75,000 to $95,000 if you’re adding it to a detached ADU that needs new sewer laterals. Homes in Long Beach built before 1950 often have limited sewer capacity, so we check the line before we promise a price.
Drainage and Sewer Capacity on Older Lots
Long Beach’s flat terrain and high water table in some areas mean undersized footings and drainage problems show up more than they do in hill cities. We test drain lines with a camera before we rough in a new bath, because finding a cracked clay sewer line after tile is set is the most expensive way to learn about it. If the sewer needs work, we price it as a written allowance, and you approve the number before we dig.
Wet-Area Waterproofing Near the Coast
The marine layer in Long Beach means bathrooms need real ventilation and moisture-resistant materials, not just a coat of paint over green board. We use fiber cement backer and properly vented fans, and we flash exterior walls to handle the salt air. That’s the difference between a bathroom that lasts and one that starts showing mold inside two years.
Trusted Brands We Service in Long Beach
We work with prefab and modular ADU product lines including Abodu and Cover, and we handle Tuff Shed conversions and James Hardie exterior systems. For Long Beach homeowners, the James Hardie cladding matters because it holds up to the salt air far better than standard fiber cement or vinyl. We stock locally common sizes and trim profiles for Long Beach projects, which means fewer weeks waiting on a shipped part and a tighter construction timeline. If you’re weighing a prefab ADU against a stick-built addition, we’ll give you straight numbers for both approaches so you can make the call with real information.
Common Home Addition Contractor Problems We See in Long Beach Homes
- Electrical panels from the 1940s fail the new ADU load calculation. A 60-amp panel cannot carry a new dwelling unit plus the existing home. We flag this in the first walkthrough and write the service upgrade into the contract as a line item, not a surprise change order.
- Salt air corrodes standard exterior hardware on alley-facing doors and windows within the first year. Long Beach’s marine layer is constant, and cheap galvanized hardware will blister and seize. We spec marine-grade hardware on any opening that faces the alley or the coast.
- High water table in flat-lot areas leads to undersized footings that crack. Older garages and room additions in Long Beach were often poured on shallow footings. When we convert them to living space, we deepen and reinforce the footing so the slab doesn’t move and invite moisture into the ADU.
- Rotted sill plates where old walls meet old slabs. Pre-1930s construction in Long Beach often has no moisture barrier, and decades of sprinkler overspray and alley drainage rot the bottom plate. We replace the framing with pressure-treated lumber and add a capillary break before closing up.
Pricing for Home Addition Contractor in Long Beach, CA
Detached ADUs in Long Beach run $180,000 to $320,000 before site work, with the final number driven by foundation depth, sewer lateral condition, and panel capacity. Garage conversions land between $90,000 and $150,000. Room additions run $120,000 to $220,000, and a bathroom addition typically falls between $35,000 and $95,000 depending on whether it’s in the main house or a detached structure. We price the unknown before we start: inspection first, allowances written into the contract, and any surprise condition priced and approved in writing before we touch it. Call (562) 317-7042 for a free estimate and a written price.
We Also Serve Cities Near Long Beach
Our crews serve Long Beach and the surrounding communities, including Signal Hill, Lakewood, Lomita, and Hawaiian Gardens. If your home is in one of those cities and you’re planning an ADU or addition, the same Threshold Standard applies: written price first, photo-badged crew, and a 365-Day Done Right Promise on the workmanship.
Serving Long Beach, CA - Our Local Coverage Area
We’re based in the Long Beach 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 Long Beach
Yes, in most cases. A 1920s Long Beach home usually has a 60-amp or 100-amp panel, and adding a dwelling unit triggers a load calculation that exceeds either one. The panel upgrade typically adds $4,000 to $8,000 to the project cost, and we write it into the contract as a known line item, not a surprise. Call (562) 317-7042 for an exact quote, and we’ll check your panel during the free estimate.
In central Long Beach, many lots are “alley-loaded,” meaning the garage faces a rear alley instead of the street. Long Beach’s zoning interpretation allows zero-lot-line setbacks for garage ADUs on these lots, so you can build to the property line along the alley where a street-facing lot would require a setback. This can add 40 to 80 square feet of buildable space, but it also means we have to detail the alley-side wall for drainage and salt-air exposure. Call (562) 317-7042 and we’ll check your specific lot against current Long Beach code.
We open the wall or floor, identify the extent of the rot, and price the repair as a written allowance before we proceed. In Long Beach’s marine layer, dry rot behind stucco and along slab edges is common, especially where sprinklers have been hitting the same wall for decades. We replace rotted framing with pressure-treated lumber, add a moisture barrier, and re-flash the exterior. The allowance language in the contract means you approve the actual number before any of that work starts.
No. Long Beach’s coastal climate means many ADUs and additions work fine with cross-ventilation, ceiling fans, and a well-placed window or two. We still rough in electrical capacity for a mini-split if you change your mind later, but you won’t be forced into a full HVAC system just to meet code. If your lot sits inland near Signal Hill, where the marine layer burns off earlier, we may recommend a small ductless unit, but that’s your call, not a requirement.
We use an inspection-first process: we open the wall, floor, or ceiling during a dedicated discovery phase, then price what we actually find as a written allowance. Old wiring, foundation cracks, and rotted framing are not surprises to us, they’re the job. You approve the allowance amount in writing before we proceed. That’s how we keep a Long Beach addition from blowing the budget at rough-in. Call (562) 317-7042 to schedule your free estimate and see a sample allowance sheet.
Get a Written Price Before You Open Up a Wall
Opening up a 1900 to 1950 Long Beach home always turns up something: outdated wiring, undersized framing, failed waterproofing, or a foundation that wasn’t built for what’s coming next. Our job is to make sure that “something” never becomes an expensive surprise. Inspection first, allowances written into the contract, and any new condition priced and approved in writing before we touch it. Call Sutton ADU Long Beach at (562) 317-7042 to schedule a free estimate with Miles Hartwell and the team, and get a written price before any tool is lifted.
Written by Miles Hartwell, Owner at Sutton ADU Long Beach. Sutton ADU Builders was founded in 2006 as part of the Threshold Group family of home-service companies operating under Threshold Verified standards.
