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 Cerritos
If you’re searching for a home addition contractor in Cerritos, the honest ballpark is $180 – $420 per square foot depending on scope, finish level, and whether you’re building out or up. A 400-square-foot room addition in Cerritos typically runs $72,000 – $168,000, while a second-story addition of the same size lands closer to $130,000 – $220,000 because it means opening the roof, reinforcing the existing framing, and re-roofing the entire structure. We know you want a real number before anyone swings a hammer, and that’s exactly how we operate. Benson ADU Builders serves Cerritos homeowners with written pricing before work starts, a 365-Day Done Right Promise in writing, and a live person answering the phone at (903) 568-7222. Our crews know every tract-home quirk in Cerritos because we’ve worked on them, not because we read about them.
Why Benson ADU Builders Is Cerritos’s Preferred Home Addition Contractor Company
Most Cerritos homeowners we meet have never hired a contractor for an addition. They have questions they’re almost embarrassed to ask, and they’ve heard a horror story or two from a neighbor. Our approach is to answer every question in plain English and put the plan on paper before we ever ask for a deposit. Troy Eastman leads the team with a simple rule: if it isn’t in writing, it didn’t happen. That’s why every Benson project in Cerritos starts with a written price, a written guarantee, and a schedule you can actually track.
We work regularly in neighborhoods across Cerritos, from the tract streets east of Carmenita Road up through the homes near Cerritos Regional County Park. The feedback from Cerritos customers consistently mentions two things: the crew showed up in uniform and on time, and the final invoice matched the original written price. Those aren’t compliments we take lightly. They’re the entire reason people call us. Dispatch and scheduling are coordinated from our Los Angeles office, with local crews serving Cerritos directly.
Our Home Addition Contractor team handles everything from small bump-outs to full second-story additions, and we’re authorized to build with Abodu, Dvele, and Mighty Buildings prefab systems alongside conventional site-built construction. That means you get curated options, not a single take-it-or-leave-it plan.
Second Story Addition Contractor in Cerritos
A second story addition contractor handles what is usually the biggest structural project a Cerritos homeowner will ever take on: cutting the roof off the existing home, reinforcing the walls and foundation, framing a new floor, and building an entirely new upper level that matches the old house. In Cerritos, this job carries a specific set of complications because so many homes here were built in the late 1960s through the 1970s. Ceiling joists from that era are often undersized for a second floor, which means new LVL beams or engineered lumber typically has to be sistered to the existing framing before vertical work can start.
You’d consider a second-story addition in Cerritos when your lot has generous side and rear yards but the ground-level footprint is already at its practical limit, or when you want to preserve the backyard for family use. Cerritos has some of the largest residential lots in the Gateway Cities region, so building up isn’t always the first choice; for many homeowners it’s the best choice because it keeps the yard intact and adds real square footage without eating into outdoor space. Expect to pay $130,000 – $220,000 for a 400-square-foot second-story addition in Cerritos, with larger or more complex builds running higher.
Structural reinforcement for 1960s – 70s framing
Before any vertical framing goes up, the existing ceiling structure has to carry the new load. That means opening the ceiling, inspecting every joist, and adding LVL or LSL beams where the original 2×6 or 2×8 lumber falls short. Cerritos tract homes almost always need some level of reinforcement, and that cost has to be in the budget up front, not discovered mid-project.
Matching the original roofline and stucco
Cerritos homes from this era tend to have specific roof pitches and stucco textures that are hard to replicate if you don’t do it deliberately. We field a lot of calls from homeowners who got a cut-rate bid elsewhere and ended up with an addition that looks bolted-on. The fix is matching pitch, fascia board width, and stucco finish from the start, which is exactly what we do on every second-story addition.
Garage Addition Contractors in Cerritos
Garage addition contractors in Cerritos usually do one of two things: convert an existing attached garage into conditioned living space, or add a new garage structure to the property. Each path has different rules in Cerritos. A conversion that changes a garage into a bedroom, office, or ADU triggers a change of use, which means permits, insulation upgrades, floor elevation, and often a new foundation pour if the slab wasn’t rated for living space. A new detached garage addition is structurally simpler but still has to clear the city’s setback requirements and lot-coverage limits.
A garage conversion in Cerritos typically runs $55,000 – $120,000 depending on whether you need plumbing, how much of the existing slab is usable, and whether you’re adding a bathroom. A new detached two-car garage addition usually lands between $65,000 and $110,000. Both projects move faster when the scope is written correctly on day one, because a missed pre-1978 lead or asbestos protocol can stop a permit cold. We handle that paperwork and testing on your behalf so the schedule doesn’t slip.
Garage conversions with a living-space upgrade
Most pre-1978 Cerritos garages were never insulated, and the slab sits at grade with no vapor barrier. To convert that to comfortable, legal living space, we raise the floor if needed, add perimeter insulation, run new electrical and plumbing, and bring the entire assembly up to current California energy code. That’s the honest scope of work, and it’s why written pricing matters so much here.
New garage additions that stay within lot limits
Cerritos has specific rear and side setback rules, and a garage addition can easily push past them if the site survey was done on a napkin. Before we design anything, we pull the parcel’s lot-coverage data and setback requirements so the plan fits the property the first time. No redesign fees, no back-and-forth with the city over something we should have caught.
Trusted Brands We Service in Cerritos
We build with Abodu, Dvele, and Mighty Buildings prefab systems alongside traditional site-built framing, which gives Cerritos homeowners a choice between a fully custom addition and a faster prefab panel system that arrives on-site with wall sections already built. Each brand has different lead times and design constraints, so we walk you through the tradeoffs honestly rather than steering you toward whatever has the highest margin. We also use James Hardie cladding and trim on additions where the existing stucco or siding needs a durable, low-maintenance match. Because we stock common components and have direct relationships with these manufacturers, turnaround on materials for Cerritos projects is faster than a general contractor waiting on a lumberyard.
Common Home Addition Contractor Problems We See in Cerritos Homes
- Pre-1978 lead paint and asbestos protocols. Almost every Cerritos tract home built before 1978 requires testing and containment before any demolition starts. Skipping this step stalls permits and can force a mid-project stop order.
- Undersized ceiling joists discovered during a second-story scope. The 1960s and 1970s framing in many Cerritos homes wasn’t engineered for a second floor. Catching this during the pre-construction review saves thousands compared to finding it after the roof is off.
- Lot-coverage and setback violations on garage additions. Cerritos has specific rules for how close a structure can sit to the property line and how much of the lot can be covered. A garage or second-story plan that ignores this gets rejected at plan check.
- Additions that look bolted-on because the stucco and roof pitch don’t match. Matching 1960s – 70s Cerritos stucco texture and fascia dimensions takes deliberate effort. Generically-built additions stand out, drop curb appeal, and hurt resale value.
Pricing for Home Addition Contractor in Cerritos, CA
Here’s what we tell every Cerritos homeowner who calls: a ground-level room addition runs roughly $180 – $280 per square foot, a second-story addition $260 – $420 per square foot, and a garage conversion or new garage structure lands between $55,000 and $120,000 depending on scope. A bathroom addition in Cerritos typically runs $45,000 – $95,000, and a bump-out addition for a kitchen or living space usually falls between $40,000 and $80,000. What moves the number most is the age of your home, whether structural reinforcement is needed, whether lead or asbestos abatement applies, and how closely the addition has to match the existing stucco and roofline. We give you a written line-item price before any work starts, and that price doesn’t change unless you change the scope. Call (903) 568-7222 and we’ll walk through your specific project.
We Also Serve Cities Near Cerritos
Beyond Cerritos, our crews take on addition projects in Artesia, La Palma, Hawaiian Gardens, and Norwalk. If you’re a homeowner in one of those neighboring cities, you get the same written pricing and 365-Day Done Right Promise as our Cerritos clients. Same crew standards, same guarantee, same straight answers.
Serving Cerritos, CA - Our Local Coverage Area
We’re based in the Cerritos 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 Cerritos
Yes, every structural home addition in Cerritos requires a building permit, and plan review timelines vary by project complexity and current city workload. Most addition permits in Cerritos take several weeks to a few months from submittal to approval. We prepare and submit the full permit package on your behalf, and we pull all required permits before construction starts. Call (903) 568-7222 and we’ll walk through what your specific scope would involve.
Yes, a garage conversion is a legal change of use in Cerritos as long as you meet the city’s parking replacement requirements, which may include maintaining a covered or uncovered parking space on the property. The conversion itself requires insulation, floor elevation, electrical, and sometimes plumbing upgrades to meet living-space code. We scope all of that in the written price, so you know the full cost before work begins. Call (903) 568-7222 to talk through your garage.
The structural reinforcement of the existing home is usually the single biggest cost driver on a second-story addition in Cerritos, because most 1960s – 70s tract homes have ceiling joists that weren’t sized for a second floor. The next biggest is matching the original stucco texture, roof pitch, and fascia detailing so the addition doesn’t look tacked on. We identify both of these during the pre-construction scope review, so the written price reflects reality from day one. Call (903) 568-7222 for a line-item breakdown.
Cerritos doesn’t require an addition to match the original finish, but a mismatched stucco texture or roof pitch will visibly reduce the home’s curb appeal and resale value. We match the existing stucco profile, fascia width, and roof pitch as standard practice on every addition. It costs more than a generic finish, and it’s worth every dollar. Call (903) 568-7222 and we’ll explain how we do it.
A pre-1978 Cerritos home will almost always add cost for lead-based paint testing, potential asbestos containment, and structural upgrades that newer construction doesn’t need. We build those items into the written price before work starts, so they never become a mid-project surprise. If your home is from the 1960s or 1970s, you should expect a more detailed scope review. Call (903) 568-7222 to schedule your free estimate.
Written by Troy Eastman, Owner at Benson ADU Builders, serving Cerritos with written pricing, a 365-Day Done Right Promise, and straight answers on every home addition project.
