Free written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
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AfterFast, Reliable Home Additions & ADU Across Inglewood
Adding onto a home in Inglewood costs $45,000 to $130,000 for a room addition, $90,000 to $220,000 for a detached ADU, and $30,000 to $80,000 for a garage conversion, and the single biggest factor in that range is what your walls and foundation reveal once we open them up. We’re Barrett & Sons Construction, and we have been remodeling and adding onto Inglewood homes long enough to know exactly what hides inside them: knob-and-tube wiring, unreinforced foundations, and permit triggers that a generic quote never mentions. Call us at (877) 610-1318 for a free estimate, written in plain English, with every allowance on paper before the first nail moves.
Why Barrett & Sons Construction Is Inglewood’s Preferred Home Additions & ADU Company
Tom Barrett started this company in 1998 and his sons run the crews today. That matters in Inglewood because the guy who shakes your hand at the estimate is the same person you will see on the job site, not a project manager you will never meet again. We have worked in every corner of the city, from the tree-lined blocks off La Brea near Morning Side Park to the older bungalow pockets around Darby and Rogers Park, and we know which 1940s-era homes still have their original galvanized supply lines and which mid-century ranch layouts can carry a second story without fighting the floor plan.
Our Inglewood customers call us back for two reasons. First, every price change arrives as a written change order before work proceeds, so the number you sign is the number you pay unless you approve something different in writing. Second, our 90-Day Done Right Promise is printed on every contract: if something is not done right, Tom comes back and makes it right, one call, no argument.
Our Home Additions & ADU Services in Inglewood
We handle the full range of Home Additions & ADU work in Inglewood, from a single-room bump-out to a detached unit with its own address. Here is what we do most often in this city.
Room Additions
Most Inglewood room additions start as a kitchen-to-family-room opening or a master bedroom bump-out on a 1940s or 1950s bungalow. Because Inglewood sits directly on the Newport-Inglewood Fault, any addition permit here triggers CBC seismic retrofit requirements on the existing structure, including foundation bolting and cripple-wall bracing. We price that in from the start, because the contractor who leaves it out is not saving you money; he is selling you a change order he already knows is coming.
ADU Design & Permitting
Inglewood’s building department has been absorbing permit applications from the Hollywood Park and SoFi Stadium buildout for years, which means counter backlogs that neighboring cities like Hawthorne or Culver City simply do not experience. Our ADU design and permitting process includes pre-checked Title 24 compliance and CBC seismic documentation before the packet ever goes in. Complete packages move. Incomplete ones sit. We have seen the difference repeatedly in every Inglewood ZIP code we serve: 90307, 90308, 90309, and 90310.
Garage Conversion ADU
Inglewood has thousands of detached two-car garages behind post-WWII bungalows, and most sit on original unreinforced slabs that predate current seismic code. A garage conversion ADU here is rarely a cosmetic job. Many of these structures were never designed for occupancy, which means we are usually adding shear walls, upgrading the slab connection, and replacing old flat roofs that leaked for years before anyone noticed. We walk you through that honestly at the estimate, so your bid reflects what the city will force, not what a contractor hopes you will not ask about.
Junior ADU & Interior Conversion
For Inglewood homeowners who want rental income or a place for aging parents without a full ground-up build, a junior ADU or interior conversion inside the existing footprint is often the fastest path. These projects still trigger seismic review when they change the building’s occupancy classification, but they avoid the foundation exposure a detached structure requires. We have converted attached garages, enclosed porches, and former utility rooms into legal junior units throughout the city, always with the permit inspector signing off before anyone moves in.
What happens when you call
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A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Inglewood
When your addition or ADU calls for windows, we install Simonton and Ply Gem products, and for impact-rated openings near busier corridors like Century Boulevard we often spec PGT. These are brands you can look up, with published warranties and local supply availability, not mystery units off a van. Because we install them regularly across Inglewood, we know exactly how they handle marine-layer moisture and how they perform in the coastal air that rolls through this part of the South Bay every morning.
Common Home Additions & ADU Problems We See in Inglewood Homes
Opening up an Inglewood home is rarely boring. Here is what we routinely find, and how we handle it.
- Knob-and-tube and early Romex wiring. Homes built between 1940 and 1965 in Inglewood routinely have original knob-and-tube circuits that a previous owner spliced into newer Romex, sometimes creatively. Any addition or ADU that touches those walls triggers a rewire of the affected circuits, because the city will not sign an addition over unsafe existing electrical. We price a wiring allowance into every bid for a home from this era.
- Unreinforced foundations and missing seismic bracing. The Newport-Inglewood Fault runs through this city, and the CBC requires foundation bolting, cripple-wall bracing, and sometimes soft-story shear on the existing structure when you add to it. A contractor who skips this in the quote is planning to surprise you later. We price it up front, because the permit inspector works for you, not for us, and he will check.
- Asbestos in original stucco, floor tile, and pipe wrap. Inglewood’s 1940s and 1950s housing stock commonly contains asbestos in exterior stucco, vinyl or asphalt floor tile, and duct or pipe insulation. When a remodel or addition disturbs those materials, abatement becomes mandatory. Our contracts include an asbestos testing and abatement allowance from day one, so the discovery does not become an unplanned bill.
- Water damage at old roof junctions and flat-roof garage conversions. Marine-layer fog in Inglewood keeps things damp through late spring and early summer, and decades of that moisture settles into the low-slope roofs on detached garages and the flat-roof additions that were popular in the 1950s. We regularly find rotted double top plates and failed flashing exactly where the old roof meets the new structure. We stop, document it, price the repair, and get your signature before moving forward.
Pricing for Home Additions & ADU in Inglewood, CA
Here is what we tell Inglewood homeowners when they ask what an addition or ADU actually costs in this city. The ranges below reflect what we have bid and built here, including the seismic retrofit work the city requires on the existing structure.
| Project Type | Typical Inglewood Range |
|---|---|
| Home Addition | $45,000 - $130,000 |
| ADU Construction | $90,000 - $220,000 |
| Garage Conversion | $30,000 - $80,000 |
What moves the number inside those ranges is what the walls and foundation reveal: wiring age, framing condition, asbestos presence, and how much seismic retrofit the original structure needs. That is why we recommend a site inspection before you commit to a number, and why our quotes include allowances for exactly those unknowns. Every allowance is written into the contract, every change order is in writing, and the price you approve is the price you pay. Call (877) 610-1318 for a free, itemized estimate.
We Also Serve Cities Near Inglewood
Our crews serve Inglewood and the surrounding South Bay communities, including Hawthorne, Del Aire, Lennox, and Alondra Park. If you live in one of those neighborhoods and are planning a room addition, ADU, or garage conversion, the same written pricing, permitting discipline, and seismic retrofit experience applies. Call us at (877) 610-1318 and we will come take a look.
Serving Inglewood, CA - Our Local Coverage Area
We’re based in the Inglewood 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 - Home Additions & ADU in Inglewood
Yes, in nearly every case. Inglewood sits on the Newport-Inglewood Fault, and any addition that adds floor area or changes occupancy triggers current CBC seismic requirements on the existing structure, including foundation bolting, cripple-wall bracing, and shear wall upgrades where engineered. A second-story addition over a garage usually triggers soft-story retrofitting on the garage itself, because garage openings create a weak wall line. The good news is that retrofitting an older Inglewood bungalow is a known quantity for us, and we price it in the original bid rather than discovering it mid-project. Call (877) 610-1318 and we will explain exactly what your specific house will require.
Right now, permit reviews for a detached ADU in Inglewood are taking longer than in neighboring cities, largely because the building department is still absorbing commercial submittals from the Hollywood Park and SoFi Stadium buildout. The single best way to avoid multi-week delays is to submit a complete package with pre-checked Title 24 and CBC seismic compliance documentation the first time. That is exactly how we prepare every Inglewood submittal, and it is the difference between a project that starts on schedule and one that stalls in the queue. Call (877) 610-1318 to get your permit package started correctly.
If your home was built between roughly 1940 and 1965, there is a strong chance it will, especially in the areas where additions tie into the original structure. We recently opened a wall on a 1952 bungalow near Century and Prairie and found knob-and-tube spliced into early Romex, plus a water-damaged double top plate where the old flat roof had been leaking for years. We stopped work, wrote a change order for the rewire and framing repair, and had the updated permit and allowance signed before the next draw schedule cut. That is how we handle every surprise: documented, priced, and approved in writing before we touch it. Call (877) 610-1318 for an estimate that already includes a wiring allowance.
Sometimes, but not always. Many detached garages in Inglewood sit on unreinforced slabs from the 1940s and 1950s that were never designed for occupancy, and an ADU conversion triggers structural review that often requires slab thickening, new footings at shear wall locations, or a full replacement depending on condition. The only way to know is to expose the slab edge and have an engineer evaluate it, which we do during the inspection phase, so your bid reflects what the foundation can actually carry. Call (877) 610-1318 to schedule a garage inspection before you commit to a number.
Because a very high percentage of Inglewood’s original 1940s and 1950s housing stock contains asbestos in the stucco, floor tile, duct wrap, or pipe insulation, and any addition or ADU that disturbs those materials triggers mandatory abatement. If the allowance is not in the contract, the owner has no price protection when the test comes back positive, and the schedule collapses while abatement gets coordinated. We include the testing and abatement allowance on every Inglewood project from day one, so the discovery is already priced and the project keeps moving. Call (877) 610-1318 to get an estimate that does not hide this from you.
Written by Tom Barrett, Owner at Barrett & Sons Construction, serving Inglewood and the surrounding South Bay communities since 1998.