A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateFast, Reliable Room Addition Contractor Across Florence-Graham
A room addition in Florence-Graham usually runs $180 – $320 per square foot for conventional stick-built work, and most projects we quote land between $85,000 and $220,000 depending on foundation condition, county fire sprinkler triggers, and whether you’re building on a slab or over an existing garage. That’s the honest range before we’ve seen your lot. We serve all of Florence-Graham, from the streets off Gage Avenue down to the neighborhoods near Florence Avenue, and we know the county permitting process here better than most. Call (424) 358-3068 and we’ll put a written price in front of you before any work starts.
What makes Florence-Graham different is simple: you’re in unincorporated Los Angeles County. That means L.A. County Building and Safety reviews your plans, not the City of Los Angeles. It changes the paperwork, the fire sprinkler rules, and how quickly things move. We handle that every week. Our crews come from the Los Angeles area and work locally across Florence-Graham, so we’re not learning your streets on the job.
Why Fielding ADU Torrance Is Florence-Graham’s Preferred Room Addition Contractor Company
We didn’t start by advertising. We started by showing up to Florence-Graham jobs with a written scope, a real schedule, and a crew in uniform. Homeowners here have dealt with the other kind of contractor: the one who gives a verbal number, disappears for three weeks, then shows up with a change order. That’s not how we work. The Room Addition Contractor team at Fielding puts the price in writing before the first nail goes in, and that number is the number on your final invoice.
Reed Calloway runs our field operations with one rule: the job is not done until the county inspector signs off and the site is clean. That philosophy matters on Florence-Graham’s 50-foot-wide lots, where a messy material drop or a sloppy foundation dig can eat into a neighbor’s driveway or block an alley. Our crews have worked the tight setbacks and long narrow parcels in this area enough to know where the trailer goes and where it doesn’t.
We also take the county seriously. Every room addition here goes through L.A. County plan check, and we don’t treat that as a formality. We coordinate directly with county Building and Safety, submit plans that account for local fire sprinkler triggers, and walk the inspector through the job before you ever have to. That’s what local knowledge means in Florence-Graham. It’s not a slogan. It’s the difference between a three-month addition and an eight-month stall.
Modular Home Addition in Florence-Graham
A modular home addition in Florence-Graham is a factory-built room or suite delivered to your property in sections and craned or rolled onto a prepared foundation. For a 400 sq ft bedroom-and-bath addition, modular construction typically runs $210 – $300 per square foot all-in before permit fees, and it can cut on-site framing time from six weeks to under two. The catch in Florence-Graham is the county: the modules still need a county plan check, the foundation still needs to meet current code, and fire sprinklers still trigger based on the expanded living area. We handle all of it.
Prefab platforms and factory built sections
We work with Abodu, Cover, and Dvele for modular and panelized additions, and we have installed their systems on county-regulated lots. These are not mobile homes; they’re engineered structures that ship to your street and get set with a crane or a small crew depending on access.
Site prep and foundation
Florence-Graham’s 1920s – 1950s building stock means the existing slab or stem wall often is not sufficient for a modular addition. We scope that before ordering the modules. New footings, anchor bolts, and sometimes a full replacement perimeter foundation go in first, and that’s usually $8,000 – $25,000 depending on soil and access.
Home Addition Plans in Florence-Graham
Home addition plans in Florence-Graham are architectural drawings and structural calculations prepared specifically for L.A. County review, not just a sketch a contractor draws on graph paper. A full plan set for a room addition here runs $4,500 – $12,000 depending on whether you’re adding a simple bedroom, a primary suite, or a two-story addition that touches an existing 1940s garage wall. County plan check fees, structural engineering, and Title 24 energy calculations are part of that package when we scope the job.
Structural engineering and county submission
The county wants calcs. An addition that adds living area to a 1950s stucco bungalow off Gage Avenue need a structural engineer’s stamp on the roof load path, the foundation, and the connection from old framing to new. We handle the submission and the resubmission if the county kicks back comments.
Fire sprinkler review
Expanding living area past the county’s threshold often triggers a residential fire sprinkler requirement. That adds $6 – $12 per square foot and changes how we route plumbing. We identify this in the quoting phase, not after drywall is up, because retrofitting sprinklers into a finished addition is expensive and avoidable.
Trusted Brands We Service in Florence-Graham
We work with Abodu, Cover, and Dvele for modular and panelized additions, and we stock the standard connection hardware, flashing, and underlayment those platforms require at our local staging yard, so Florence-Graham customers aren’t waiting on a backordered part from out of state. For conventional builds, we frame with standard dimensional lumber and wrap with James Hardie siding where the design calls for a low-maintenance exterior that handles the dry Florence-Graham summers. If you have already researched Abodu or Cover online, call us; we’ve installed them and we can tell you exactly what the county will ask for.
Common Room Addition Contractor Problems We See in Florence-Graham Homes
- Pulling a City of L.A. permit by mistake. Florence-Graham is not in the City of Los Angeles. A contractor who files with L.A. City will get rejected and lose weeks. We file with L.A. County Building and Safety from day one.
- Adding a room onto an aging 1920s foundation. Many Florence-Graham bungalows were built on unreinforced masonry or thin slabs. Without a structural upgrade, the new addition cracks and the inspection fails. We scope foundation work before we quote.
- Missing the fire sprinkler trigger. The county has its own thresholds for when an addition requires residential sprinklers. Some contractors frame and drywall first, then discover the requirement. That retrofit is expensive. We catch it in plan review.
- Ignoring drainage on long narrow lots. Florence-Graham’s 50-foot-wide parcels drain toward the alley or the street. A poorly graded addition sends water into a neighbor’s yard or back against your own foundation. We survey the lot and build the grade line into the plan.
Pricing for Room Addition Contractor in Florence-Graham, CA
Here’s what we tell homeowners in Florence-Graham before they commit to a drawing. A simple bedroom addition on an existing slab runs $160 – $220 per square foot. A primary suite with a full bath and new foundation work runs $210 – $290 per square foot. A two-story addition over an existing detached garage runs $230 – $320 per square foot because the old garage wall usually needs a new footing and shear wall. County fire sprinklers, if triggered, add $6 – $12 per square foot. Plans and engineering add $4,500 – $12,000. Those are written ranges from our Florence-Graham quotes. The free estimate tightens them to an exact number before you sign anything.
Call (424) 358-3068 and ask for a written line-item quote. No verbal ballpark that changes later.
We Also Serve Cities Near Florence-Graham
Beyond our daily work across Florence-Graham, we take room addition projects in nearby Florence-Graham neighborhoods and the surrounding cities of Torrance, Inglewood, Compton, and Redondo Beach. If you’re just over the county line, call us; the permitting body changes but our process does not.
Serving Florence-Graham, CA - Our Local Coverage Area
We’re based in the Florence-Graham 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 Room Addition Contractor in Florence-Graham
Yes. Florence-Graham is unincorporated, so L.A. County Building and Safety issues the permit, while Huntington Park runs its own city permit office. County plan review for a room addition typically takes four to eight weeks depending on complexity, and the county’s fire sprinkler threshold and structural requirements differ from Huntington Park. We prepare plans for whichever authority governs your property.
Most Florence-Graham lots are on municipal sewer and water, so septic and well setbacks don’t come into play the way they do on rural county parcels. On the rare larger lot with a legacy septic system, the county requires the addition to maintain the same minimum clearance from the leach field as the existing structure, which can shift the footprint. We check your property’s service records before we draw.
Because it’s true more often than not in Florence-Graham. Many 1940s detached garages here sit on unreinforced masonry or a thin perimeter footing with no rebar and no anchor bolts. Adding a room above adds a real vertical and lateral load, and the county will ask for an engineered foundation upgrade before it approves the addition. A contractor who skips that step is setting you up for a failed inspection.
Yes. Modular additions from Abodu, Cover, and Dvele can be designed and plumbed to meet L.A. County’s residential fire sprinkler requirements, provided the module is ordered with the sprinkler loop spec’d into the factory build. We coordinate that with the manufacturer before the module ships, because changing it on site is far more expensive than getting it right in the factory.
On a 50-foot-wide lot that runs 120 to 150 feet deep, drainage has to go somewhere. The county will want a grading plan if the addition changes the lot’s existing drainage pattern, which usually means pitching the new slab slightly toward a new area drain or a swale at the rear. We survey the lot and put the grade line in the plan set, not as an afterthought. Call (424) 358-3068 if you want us to walk your lot and tell you what your addition would need.
Written by Reed Calloway, Owner at Fielding ADU Torrance, serving Florence-Graham and the surrounding Los Angeles County area since 2006.
