A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateFast, Reliable ADU Builders Across Florence-Graham
Adding an accessory dwelling unit in Florence-Graham costs between $180,000 and $420,000 for a detached unit and $90,000 to $180,000 for a garage-conversion JADU, with the county permit process shaping the timeline more than anything else. The single most important fact about building an ADU here: Florence-Graham is unincorporated Los Angeles County, so your permits, plan checks, and inspections go through LA County Public Works and Department of Building and Safety (DBS), not the City of LA’s LADBS, even though the city line is two blocks away. That one detail changes your submittal queue, your inspector pool, and your total calendar. Our ADU Builders team walks every Florence-Graham project through the county process from the first site visit through final sign-off. Call (903) 568-7222 for a written price before any work starts.
Why Benson ADU Builders Is Florence-Graham’s Preferred ADU Builders Company
We work a lot in Florence-Graham as a Room Addition Contractor in Florence-Graham, and that’s not a coincidence. The housing stock here is overwhelmingly 1930s-to-1950s single-family homes on R-1 lots between 5,000 and 6,000 square feet, almost all with detached garages at the rear alley. That means nearly every project we price here is either a garage-conversion JADU, a rear detached ADU, or some version of both competing for the same buildable space. We know what the LA County plan-checkers flag on those projects, because we’ve been through that exact review on Graham Avenue, on Gage, on Compton Avenue, and up and down the residential blocks east of Alameda.
Every project we run in Florence-Graham starts with a written, line-item price. Not an email estimate, not a verbal ballpark, not a price that shifts at the door. The number we put in front of you before work begins is the number on the contract. If something isn’t done right within 365 days, we make it right on our dime. That guarantee is stamped on your paperwork, not buried in a brochure. Our technicians are background-checked and show up in uniform, so you always know exactly who’s walking onto your property. And when you call, a live person answers around the clock, no voicemail loop, no phone tag.
Led by Troy Eastman, the ADU Builders in Florence-Graham team knows the county DBS submittal sequence, the rear-alley setback math on these narrow R-1 parcels, and the service-panel and sewer-line realities on pre-1960 houses. That’s the stuff that either saves you $20,000 in change orders or costs you $20,000 you never saw coming.
Detached ADU in Florence-Graham
A detached ADU in Florence-Graham is a separate living unit with its own kitchen, bath, and entrance, built behind or alongside the primary house. On a typical 5,000-to-6,000-square-foot R-1 lot here, that almost always means building where the old detached garage used to sit, or rebuilding the garage footprint with a full second story. A rear detached unit on this housing stock typically runs $220,000 to $420,000, depending on whether it’s a one-bedroom over a slab or a two-story two-bedroom with an upgraded panel and all-new utilities. The price is set before work starts. Not on day forty.
Garage-replacement one-bedroom
A one-bedroom detached unit over a new slab in place of a demolished 1940s garage is the most common spec we price in Florence-Graham. It usually lands between $220,000 and $300,000. You get a full bath, a compact kitchen, a mini-split for heating and cooling, and a separate address for the unit. The county will want fire separation from the alley, compliance with the rear setback, and a clear path of travel from the street or alley to the unit’s entrance.
Two-story detached with two bedrooms
Families housing relatives in Florence-Graham often go two-story. A two-bedroom, one-and-a-half-bath detached ADU here generally runs $340,000 to $420,000. You get more square footage on the same footprint, which matters when the rear yard is tight. The structural work on a two-story over a slab is heavier, and we’ll usually need to upgrade the existing 100-amp service to 200 amps. The written price you approve covers that upgrade, not a change order later.
JADU in Florence-Graham
A JADU, or junior accessory dwelling unit, is a converted space inside an existing home or attached garage, limited to 500 square feet, with its own entrance and a small kitchen that may share a sanitation line with the primary house. In Florence-Graham, JADUs are almost always carved out of an attached garage, a rear den, or a back bedroom, because the lot depth on these R-1 parcels doesn’t always allow for a full detached structure while keeping the primary house’s yard. A garage-conversion JADU here typically costs $90,000 to $180,000. That’s the cheapest per-square-foot way to create rentable space in Florence-Graham, and it’s the one we price most often alongside a detached unit.
Attached-garage conversion
Converting an attached garage into a JADU in Florence-Graham usually runs $110,000 to $180,000. The work involves insulating and drywalling the garage walls, running electrical and plumbing, adding a kitchenette, and bringing the opening up to code for an exterior door. If the garage sits at the rear alley, the county will still want an egress window and proper fire separation from the main house. You don’t get a separate deed, but you get a legal, rentable unit with its own address line.
Back-bedroom carve-out
A JADU carved from an existing back bedroom or den on a Florence-Graham house costs $90,000 to $130,000. The structure is already there, so the job is mostly about separating the space with a proper one-hour fire wall, adding a second sink and cooktop for the kitchenette, and opening a private exterior entrance. Utility work is lighter than a detached unit, but on these 1930s-to-1950s homes we still frequently find galvanized supply lines that need replacement where the new kitchenette ties in.
Trusted Brands We Service in Florence-Graham
We’re authorized to build with Abodu, Cover, and Boxabl, and we stock and order materials for Florence-Graham jobs directly from those brands plus James Hardie for cladding and trim. For a rear-detached project on a tight Florence-Graham R-1 lot, an Abodu or Cover prefab panel keeps the build schedule tighter than a full site-built frame, which matters when your inspector visits are spaced through the county DBS queue. Boxabl’s fold-out units are a pragmatic choice for a flat-slab garage replacement where the alley access is wide enough for delivery. Homeowners in Florence-Graham can verify any of these brands independently, which is exactly how we want it to work. We don’t lock you into one product.
Common ADU Builders Problems We See in Florence-Graham Homes
- Quoted as if the lot were in City of LA. Florence-Graham’s city limit runs right through the neighborhood, and a contractor who doesn’t check jurisdiction will price against LADBS’s faster plan-check queue and lighter comment cycle. County DBS plan check typically adds weeks to the calendar, and the bid should reflect that from day one.
- Garage-conversion JADU and detached ADU fighting for the same footprint. On most 5,000-to-6,000-square-foot Florence-Graham parcels, the rear setback, the floor-area-ratio cap, and the parking-replacement requirement force you to choose between a generous detached unit and a converted-garage JADU. You can often do both, but at least one of them shrinks’s.
- Pre-1960 utilities that quit mid-project. A 100-amp service panel, galvanized supply lines, no alley-accessible sewer cleanout, and mature ficus or avocado roots between the primary house and the rear unit. We see these on the majority of Florence-Graham ADU sites, and they’re the most common source of on-site problems before framing even starts.
- Fire-separation and egress details flagged late. The county inspects JADUs and detached ADUs as separate dwelling units, not as accessory storage. A garage conversion without a one-hour fire wall at the shared plane, or a back bedroom without a proper egress window, gets a correction notice that stalls the project until it’s fixed.
Pricing for ADU Builders in Florence-Graham, CA
Here’s a straight look at what ADU construction costs in Florence-Graham in 2026. A garage-conversion JADU runs $90,000 to $180,000. A rear detached one-bedroom runs $220,000 to $300,000. A two-story detached two-bedroom runs $340,000 to $420,000. The gap comes from site conditions: the condition of the existing slab or garage, the electrical panel amperage, the sewer lateral, and how much trenching sits between the primary house and the rear unit. County plan check, school fees, and permit costs add somewhere in the $8,000 to $20,000 range on top of construction, and we itemize every one of those before you sign. Call (903) 568-7222 and we’ll put a written price in front of you. Free estimate, no obligation, and the number you see is the number on the contract.
We Also Serve Cities Near Florence-Graham
Florence-Graham sits inside a dense grid of LA County and Orange County cities, and our crews move between them daily. We take ADU projects in Los Angeles, Long Beach, Anaheim, and Riverside, applying the same written-price and 365-day guarantee no matter where the lot sits. Our ADU Builders team can price a project across multiple properties if you’re comparing lots in more than one city.
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 ADU Builders in Florence-Graham
You pull ADU permits from LA County Public Works and Department of Building and Safety, not from LADBS, because Florence-Graham is an unincorporated pocket of LA County that is not within City of LA jurisdiction. Even though the city line runs two blocks from most Florence-Graham addresses, the plan-check queue, the submittal portal, and the inspector you’ll meet are all county, and that typically adds weeks to the calendar compared to a City of LA ADU. Call (903) 568-7222 and we’ll verify your specific parcel’s jurisdiction before we ever write the bid.
Yes, in many cases you can, but on a 5,000-to-6,000-square-foot Florence-Graham R-1 lot, the rear setback, floor-area-ratio cap, and parking-replacement requirement often force you to shrink one unit to keep the other. The detached ADU usually gets the garage’s old footprint at the rear alley, and the JADU gets carved from an attached garage or a back bedroom. The combined project commonly runs $310,000 to $550,000 depending on the sizes. Get a written scope for both before you commit to either.
From first site visit to final inspection, a Florence-Graham ADU typically clocks 8 to 14 months. County DBS plan check commonly takes 4 to 8 weeks before you get a permit, and the comment-and-resubmit cycle adds incremental weeks on a first-time submittal. Construction itself runs 5 to 9 months for a detached unit and 3 to 5 for a JADU. The calendar hinges on county inspection scheduling, which moves at the county’s pace. We price the timeline alongside the build, and we don’t start demolition until the permit is in hand.
The price we write before work begins is the contract price, but the site can introduce conditions we flag upfront as likely variables. On pre-1960 Florence-Graham housing stock, those are: upgrading a 100-amp service to 200 amps, replacing galvanized supply lines, trenching a new sewer lateral past mature roots, and resupporting an existing garage slab that is too thin to bear a JADU conversion. We itemize each of these in the initial scope, and we give you the updated written price before we proceed. No change order happens without your signature
Yes, and for a few specific Florence-Graham reasons. Abodu and Cover panel systems work well on a rear-lot detached unit where the county queue pushes you toward a shorter on-site build schedule, because much of the unit is fabricated off-site. Boxabl’s fold-out design suits a flat-slab garage replacement on lots where the alley access can accommodate delivery. Mighty Buildings’ panelized exterior works where the lot depth is tight and you need a clean exterior thermal envelope. We’ll spec the brand that best matches your parcel, your budget, and the county’s requirements.
Written by Troy Eastman, Owner at Benson ADU Builders, serving Florence-Graham and surrounding communities.
