
Residential
El Segundo ADU contractor.
Looking for an ADU contractor in El Segundo? DECOMA designs, permits, and builds detached, garage-conversion, and junior ADUs across the residential Village west of Sepulveda — one licensed team.
Why el segundo adu
El Segundo ADU contractor — design, permits, and build under one roof
If you're searching for an ADU contractor in El Segundo, the first thing worth knowing is that the hard part here isn't the design — it's fitting a real unit onto a small Village lot and getting it cleanly through the city. DECOMA designs, permits, and builds accessory dwelling units across El Segundo's residential streets west of Sepulveda, with one licensed team from the first lot walk to the certificate of occupancy. No handoff between a designer and a separate builder, and no finger-pointing when the unit and the setbacks don't line up.
How much does an ADU cost in El Segundo?
It's the question everyone asks first, and the honest answer is: it depends on what you build. A garage-conversion ADU, a detached new-build ADU, and a junior ADU are different projects with different price tags — then site work, sewer, and finish level move the number further. We don't quote a figure before we've walked the lot. What we do on the free consult is give you an honest range and design backward from your real budget, so you get an ADU that actually builds for the number you have — and one that, in a rental market this tight, tends to pay its way back faster than owners expect.
Types of ADUs we build
- Detached ADU — a standalone unit in the rear yard; the most private and the most flexible, where the lot has room.
- Attached ADU — added onto the existing house, often the most efficient on a narrow Village lot.
- Garage conversion — converting an existing garage; usually the fastest path and frequently parking-exempt.
- Junior ADU (JADU) — up to 500 sq ft within the existing home, sometimes called a granny flat or in-law unit.
We pick the type on the lot walk based on your goal — rental income, multi- generational living, or a home office — and what your specific lot will actually hold.
ADU rules on El Segundo's small lots
El Segundo's residential heart is the Village west of Sepulveda — a compact grid of mostly 1920s-to-post-war homes on small, regular lots, where the original detached garage off the alley is often the single best ADU opportunity in town. Tight lots make setbacks and lot coverage the deciding factors, which is exactly why state law matters so much here: California lets a detached ADU up to 800 square feet go in regardless of most local coverage limits, and treats garage conversions and junior ADUs generously. East of Sepulveda is El Segundo's commercial and light-industrial side; the ADU work is almost entirely on the residential west side, and we size every unit to the lot in front of us.
How long does an El Segundo ADU take? The permit process
El Segundo runs its own Building & Safety — it is not LA County and not the City of LA — and it generally turns plans faster than either, provided the set is right the first time. That's the trade: ES is quick but exacting on corrections, so the way to keep the calendar honest is to draw to the city's standards up front. We run the corrections cycle directly, typically 8–14 weeks on the ministerial ADU pathway, then 5–9 months of construction. Two items we check early on these older lots: sewer capacity on the original laterals, and parking, which state law usually waives for garage conversions and transit-adjacent lots.
Why DECOMA for your El Segundo ADU
The expensive failures on ADUs happen in the handoff — a designer draws something the lot or setbacks can't carry, or the permit set doesn't match what gets built. Because the people who draw your ADU are the people who build it, that gap doesn't exist: one contract, one schedule, one point of accountability, with the structure self-performed under our Class A/B license. We've worked in El Segundo for forty years — commercial and residential — and the same team serves the rest of El Segundo and the South Bay, under one license since 1978.
Tell us your lot and what you're picturing. The first consult is free, 30 minutes, and ends with an honest read on whether your El Segundo ADU pencils.
How we run it
Scope to sign-off.
01
Free ADU feasibility & lot walk
El Segundo's residential lots are small — often 40–50 feet wide in the Village west of Sepulveda — so setbacks, lot coverage, and where the unit can physically go matter more here than almost anywhere in the South Bay. We check zoning, sewer, and electrical service capacity on site and give you a straight read before you pay for design.
02
Design, plans & El Segundo permits
Construction documents drawn to City of El Segundo standards and submitted on the ministerial ADU pathway where it applies. El Segundo runs its own Building & Safety — fast but exacting — and we run the counter and the corrections cycle directly, no third-party expediter.
03
Build & certificate of occupancy
Foundation, frame, MEP, finishes, and any sewer, panel, or service upgrade — structural work self-performed under our Class A/B license. Typically 5–9 months on site, ending in final inspection and certificate of occupancy.
Why DECOMA
One license, three disciplines, forty years.
Family-run South Bay general contractor since 1978. We design, build, and manage — under one license — so the team you start with is the team that hands you keys and the team that answers the phone when something needs fixing in year ten.
- Years building
- 48+
- Projects delivered
- 3,000+
- Repeat clients
- 300+
- CSLB Class
- A/B
FAQ
Common questions.
How much does an ADU cost in El Segundo?
How long does it take to build an ADU in El Segundo?
Does DECOMA pull ADU permits through the City of El Segundo?
Can I build an ADU on a small El Segundo lot?
Can I rent out my El Segundo ADU?
Do I need parking for an ADU in El Segundo?
Service areas
El segundo adu across the South Bay.
Born in Harbor City, working across LA County since 1978. Same crew, same license number, same shop at 25941 Frampton Ave, Harbor City.
Talk to a contractor
Tell us about your project.
One business day for a scope, timeline, and budget range. CSLB #375508 A/B.