A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateTrusted Home Addition Contractor for Long Beach Homeowners
A home addition in Long Beach typically costs between $180 and $340 per square foot for site-built work, with most projects landing between $90,000 and $250,000 depending on size, finishes, and whether you choose prefab panels from brands like Plant Prefab or James Hardie cladding. That’s the honest math most contractors won’t tell you until after you’ve signed. Working with a Long Beach Home Addition Contractor like Benson ADU Long Beach puts that price in writing before any work starts, so you know exactly what you’re paying and what you’re getting.
We’re part of the Relay Home Co. family, founded in 2006, and led locally by Troy Eastman. Our crew has built and finished additions across Long Beach, from Belmont Shore bedroom suites to Wrigley sunrooms and Bixby Knolls second stories. Every technician on your job is background-checked and shows up in uniform. Call (562) 362-3885 and a live person answers, any hour.
Sunroom Addition
A sunroom addition in Long Beach typically runs $85 to $180 per square foot, and it gives you a light-filled room that works as a reading space, dining area, or indoor garden without the full cost of a traditional bump-out. Our coastal climate makes this one of the smartest additions in the area: mild winters mean you’ll actually use the room year-round, not just between May and September. As your Signal Hill Home Addition Contractor, Benson ADU Long Beach handles sunrooms from permit drawings through final paint, and we’ll spec energy-efficient glazing that keeps the room comfortable when the marine layer rolls in.
Foundation and Glazing Choices
We pour a proper slab or crawl-space foundation, never a floating deck that shifts over time. For glass, we offer options from standard insulated units up to low-E packages that cut glare during those bright Long Beach afternoons while still letting in the view.
Typical Timeline and Permit Path
Most sunroom additions take 6 to 10 weeks once permits clear. We file all paperwork and pull every permit, and we’ll tell you upfront whether your project triggers coastal or historic-district review based on your specific neighborhood.
Second Story Addition Contractor
A second story addition contractor in Long Beach can add 800 to 1,500 square feet of living space without sacrificing your yard, and these projects generally run $200 to $340 per square foot because they involve structural engineering, stair placement, and roofing work. Benson ADU Long Beach has managed second-story additions across the city’s older neighborhoods, where roof pitches, floor joists, and foundation ratings vary block by block. We’ll bring in a structural engineer on day one, not after demo starts, so you know your first floor can carry the load.
Structural Engineering and Existing Footings
Many 1940s and 1950s Long Beach homes have 4×4 or 4×6 floor joists that don’t meet current code for a second story. We evaluate footings and load paths before you commit, and if a foundation upgrade is needed, that cost shows up in your written price before any work begins.
Stair Placement and Roof Integration
Stairs eat 80 to 120 square feet, so we work through placement options with you early. Roof integration matters more than people expect: we’ll either re-roof the whole structure or match new shingles to existing ones so the addition doesn’t look bolted on.
Garage Addition Contractors
Garage addition contractors in Long Beach build everything from a simple one-car attached garage up to a detached structure with finished attic space, and costs typically range from $100 to $220 per square foot depending on whether you need plumbing, electrical, or finished interiors. A detached garage converted into a work-from-home office or music studio is one of the fastest ways to add usable square footage in Long Beach without triggering full ADU review in every case. Benson ADU Long Beach, a Home Addition Contractor in Seal Beach, can frame site-built garages or work with Tuff Shed prefab shells for faster close-in times.
Detached vs. Attached Configurations
Detached garages avoid shared-wall noise and give you more placement flexibility on lots that are deeper than they are wide. Attached garages are cheaper per square foot and keep groceries dry when it rains, but they eat into the conditioned envelope of your house and often need fire-rated drywall on shared walls.
Finishing Interior Space Above the Bay
If you want storage or a small studio above the garage, we can frame for attic trusses instead of standard trusses. That adds 20 to 30 percent to framing cost but gives you 300 to 500 square feet of bonus space most Long Beach garages don’t have.
Bathroom Addition Contractor
A bathroom addition contractor in Long Beach can add a full bath for $25,000 to $60,000 and a powder room for $12,000 to $22,000, with the main variables being sewer line access, venting distance, and whether you’re adding to the first or second floor. The biggest headache in older Long Beach homes is tying new drain lines into a cast-iron stack that’s been in the ground since the Eisenhower administration. Benson ADU Long Beach scouts the drain path during the estimate, not after the slab is open.
Sewer Line Access and Venting Runs
If your existing sewer lateral is on the wrong side of the house, a bathroom addition can cost $8,000 to $15,000 more for trenching and repiping. We camera-scope the line before pricing so that number is in your written estimate from day one.
Upstairs Bathrooms and Joist Penetrations
Adding a bathroom on the second floor means drilling through floor joists for waste lines, which is a code-sensitive job. We route drains through interior walls wherever possible and reinforce any joist that gets a hole larger than code allows without repair.
Bedroom Addition Contractor
A bedroom addition contractor in Long Beach typically charges $150 to $280 per square foot for a standard bedroom with a closet and egress window, landing most projects between $40,000 and $90,000 before finishes. Bedrooms are often the lowest-risk addition because the scope is simple: four walls, a window, a door, electrical, and HVAC tied into your existing system. Benson ADU Long Beach, our Home Addition Contractor in Lakewood, can also add a home office or nursery with the same footprint for less than you’d spend on a full bathroom-equipped suite.
Egress Requirements and Window Sizing
Building code in Long Beach requires every sleeping room to have an emergency escape window with specific minimum opening dimensions. We size windows correctly the first time, so you don’t get a correction notice during framing inspection and lose a week waiting for a new window order.
Closet and Storage Build-Outs
A reach-in closet costs $1,500 to $4,000 depending on shelving, rods, and lighting. A walk-in closet with custom millwork can run $8,000 to $15,000 and turns a simple bedroom into a primary suite without changing the roofline.
Brands We Service
When homeowners choose a home addition contractor in Long Beach, they should know exactly which building systems are going onto their lot. We build with Plant Prefab panels when speed and precision matter more than a fully custom site-built frame, and we install their prefinished exterior and interior panels on foundations we pour ourselves. Plant Prefab components arrive factory-cut and factory-inspected, which reduces on-site waste and shaves weeks off a traditional stick-build schedule.
We’re also authorized to install James Hardie siding and trim on any addition, whether the rest of your home is stucco, wood, or hardboard. Hardie holds up to Long Beach’s salt air and damp winter mornings better than raw wood, and the 30-year product warranty is one homeowners can look up themselves. If you’re adding a detached workspace or storage building, we can supply and finish a Tuff Shed structure on a code-compliant foundation. Whether you choose Plant Prefab, James Hardie, Tuff Shed, or any other system, we can help you compare real numbers before the first invoice is due.
Signs You Need a Pro Right Now
- Aging wiring in the walls of the room you want to expand. Many Long Beach homes still have original 1950s electrical panels and cloth-wrapped wiring. An addition load-calc on an old panel can trip breakers daily or worse, so we evaluate service capacity before we design anything.
- Visible settling or cracks along existing foundation walls. A new addition adds weight to ground that may already be shifting with Long Beach’s clay-heavy soils. If we see stair-step cracks in stucco or widening gaps at window corners, that means a foundation check is the real first step.
- Ceiling joists cut or notched by previous owners. DIY plumbing and HVAC work from decades past often left joists compromised. An addition that ties into a damaged framing member inherits that weakness, and it has to be repaired before we close in.
- Roof leaks or missing shingles near the planned tie-in point. A new roofline intersects your existing one at valleys and crickets, which are exactly where water gets in if flashing is old. We inspect the full roof before a second-story or garage addition goes up.
- Mold or damp smells inside existing walls you plan to open. Long Beach’s coastal humidity finds every gap in old vapor barriers. If we open a wall during an addition and find black staining, the fix is affordable now and a health problem later if ignored.
Our Process, Step by Step
- 1
On-site walkthrough and measurements. We meet you at the property, measure the existing structure, check access for equipment, and look at your electrical panel, sewer cleanout, and roof condition. This first visit drives the written price, not a verbal estimate.
- 2
Written scope and price. You get a line-item price for the addition, including permits, materials, labor, and any site-specific costs like foundation repair or panel upgrades. The Relay Visibility Guarantee means this number doesn’t change unless you change the scope.
- 3
Permit drawings and submittal. We prepare drawings and file everything required for your Long Beach project. You get digital copies of every submittal, and we track plan review status so you’re not left guessing when work starts.
- 4
Construction with daily photo updates. Our background-checked, uniformed crew works through framing, mechanicals, rough inspection, drywall, and finishes. You get real-time progress tracking and can see exactly what was completed each day.
- 5
Final walkthrough and the 365-Day Done Right Promise. We walk the finished addition with you, hand over your written guarantee, and fix anything you flag on the spot. If a covered item fails within 365 days, we come back and make it right, free.
How Much Does Home Addition Contractor Cost in Long Beach?
A typical home addition in Long Beach runs $90,000 to $250,000 depending on whether you’re doing a single-room bump-out or a full second-story addition. Here’s a breakdown of common scenarios:
- Bedroom addition (200 sq ft): $40,000 to $70,000
- Sunroom addition (250 sq ft): $30,000 to $60,000
- Bathroom addition (full bath): $25,000 to $60,000
- Garage addition (finished, 400+ sq ft): $45,000 to $90,000
- Second story addition (800+ sq ft): $160,000 to $300,000
What moves the price: foundation work, sewer line relocation, electrical panel capacity, roof integration, and finish level. A full custom bathroom with tile shower and heated floor costs thousands more than a builder-grade three-piece bath. A second-story addition that requires shear-wall upgrades and new footings costs more than one that lands on an existing reinforced foundation.
The easiest way to avoid overpaying is to get a written line-item price before work starts. We don’t give verbal estimates that drift upward once demo starts; your price is fixed in writing. A free estimate from Benson ADU Long Beach includes the site walkthrough, scope review, and material options so you can compare real numbers, not promises.
Our Service Area Near Long Beach
Benson ADU Long Beach serves homeowners across Long Beach and the surrounding communities, including Downey, Buena Park, Cerritos, La Mirada, Bell, Seal Beach, Artesia, La Palma, Signal Hill, West Rancho Dominguez, and Lakewood. Most estimates within Long Beach are scheduled within a few business days. If you’re on the border of any nearby city, call us and we’ll tell you honestly whether you’re in our service area.
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.
Frequently Asked Questions About Home Addition Contractor in Long Beach
A home addition contractor is a licensed professional who designs, permits, and builds new square footage attached to or adjacent to your existing home, such as a bedroom, bathroom, sunroom, garage, or second story. Benson ADU Long Beach handles the entire process from structural evaluation through finished drywall and paint. We provide a written price before work starts and back every project with a 365-day guarantee in writing.
Most single-room additions in Long Beach take 8 to 14 weeks, while second-story and larger projects run 4 to 8 months depending on plan review times and scope. Prefab panel construction with brands like Plant Prefab can reduce on-site framing time by several weeks. We give you a project timeline in writing before you sign, and you get real-time progress tracking throughout the build. Call (562) 362-3885 to discuss your project’s specific timeline.
Home additions in Long Beach typically cost $180 to $340 per square foot, with most total projects landing between $90,000 and $250,000. The final number depends on foundation condition, sewer access, roof integration, and finish choices like James Hardie siding or custom tile. Benson ADU Long Beach gives you a written line-item price before any work starts, and that number doesn’t change unless you change the scope. Call us to schedule a free estimate.
Yes, we build with Plant Prefab panels and Tuff Shed structures where they fit the project, alongside traditional site-built framing. Prefab approaches can reduce on-site construction time and material waste while maintaining full code compliance. We’ll show you pricing for both options side by side so you can choose based on real numbers.
Yes, we regularly build additions on homes from the 1920s through the 1970s across Long Beach’s established neighborhoods. Older homes often need structural evaluation, electrical panel upgrades, and careful roof or foundation tie-in work, which we include in the written estimate. We’ll tell you what’s code-required before we start, not after we open walls.
Every Benson ADU Long Beach addition comes with the 365-Day Done Right Promise in writing: if any covered work fails within a year, we return and fix it at no cost. You also get a written guarantee on every project and a free second visit if any covered repair fails. Our work is backed by the Relay Home Co. family, founded in 2006.
Start by gathering any existing floor plans, survey documents, or past permit records you may have, though we can pull most of this for you. Clear the area where the addition will go and note any specific features you want, like closet placement, window size, or bathroom fixtures. Then call (562) 362-3885 to schedule a free on-site walkthrough and get a written price.
Schedule Your Home Addition Contractor Service in Long Beach Today
Ready to see real numbers for your Long Beach home addition? Call (562) 362-3885 now for a free, no-obligation estimate. A live person answers 24/7, and we’ll set up your on-site walkthrough at a time that works for you. Troy Eastman and the Benson ADU Long Beach crew put everything in writing before we pick up a hammer.
Written by Troy Eastman, Owner at Benson ADU Long Beach.
