
ADUs & Additions in El Segundo
Detached ADUs, garage conversions, room additions and second stories. Designed, permitted and built by our own crews.
ADUs & Additions built for El Segundo properties
El Segundo is a small beach city with a large industrial footprint. The Chevron refinery covers roughly a third of its land, the east side is given over to industry, offices, research and development and an Air Force base, and the General Plan places every home in the northwest quadrant. That leaves a compact, established residential core, almost entirely built out, where the City's planning documents record a trend toward larger homes through additions and full replacements. LAX, next door, shapes design as well. Inside the City's Residential Sound Insulation zones, new buildings and additions must meet noise standards that reach window ratings, bedroom glazing and even the kitchen hood, choices best settled in the first drawings rather than at plan check.
Mostly single-family streets, with two-family lots scattered throughout and a substantial share of multi-family housing, all within the northwest quadrant of the city. The General Plan sets 5,000 square feet as the minimum for new single-family lots and notes a trend toward larger homes, both through additions and through older houses replaced with larger new ones.
We are a design-build team, which means the people who draw your project are the people who build it. Design, engineering, permits and construction run through one project manager and our own crews, so nothing gets lost in a handoff between a salesperson and a subcontractor. We are licensed, bonded and insured, CSLB license #1119054.
Permits in El Segundo: Building permits come from the Building and Safety Division of the Community Development Department, which takes applications, plans and fee payments through its online E-Z Permit Hub and requires a permit for pool and spa installations and most excavation. The City states that regular plan check takes one to four weeks depending on scope and that accelerated plan check is aimed at seven working days, both counted from payment of plan review fees. Work that builds or alters a sidewalk, alley or public street also needs a permit from the Public Works Department. Inside the Residential Sound Insulation zones near LAX, new buildings and additions must meet the City's noise standards, with the checklist for the 65-70 dB or 70+ dB zone attached to the submitted plans.
What We Build
- LAX noise-zone window, door and ventilation specs
- Pool and spa permits through the E-Z Permit Hub
- Public Works permits for sidewalk and alley work
- Infill staging on built-out residential streets
- Detached ADUs, ground-up
- Garage conversions to living space
- Junior ADUs within the main house
- Room additions and bump-outs
- Second-story additions
- Full kitchens and bathrooms in the ADU
- Separate utility metering where required
- Private entries, patios and landscaping
- Plans, engineering and city submittals
- Title 24 energy compliance
Local Conditions
What building in El Segundo actually involves
Every city in Southern California builds differently. These are the things that change the scope, the schedule or the budget on El Segundo projects.
In the 65-70 dB noise zone, the City's prescriptive checklist calls for openable windows rated at least STC 35, caps glazing in sleeping rooms at 20 percent of the lesser of floor or wall area, and requires kitchen cooktop hoods to be non-ducted recirculating units with no connection to the exterior.
The same checklist requires quarter-inch glass in sliding glass doors and at least STC 35 for hinged exterior doors facing the noise source, so a wide glass opening to the yard has to be specified to that standard from the outset.
The City reports that its Residential Sound Insulation Program, begun in 1993, has treated 1,905 homes for LAX noise, and the airport's program can retrofit exterior doors, windows and ventilation, so an older house may already carry acoustic upgrades that a remodel needs to account for.
The General Plan describes the city as almost entirely built out, so a pool, ADU or addition is infill work, with excavation, spoil haul and concrete deliveries staged around occupied neighboring homes.
Investment
What this costs in El Segundo
Real Southern California ranges, not a teaser number. Every project is priced line by line after we have seen the site.
Detached ADU
$150,000 to $400,000+
What moves it: square footage, finish level, utility runs, and site access; garage conversions typically run well below a ground-up detached build
Garage conversion ADU
$80,000 to $180,000
What moves it: whether the existing slab and framing meet current code, how far utilities have to run, and the finish level of the kitchen and bathroom
Plans, drawings and permit management
$4,500 to $25,000+
What moves it: project type and size, whether structural engineering, Title 24 or a soils report is required, and how many jurisdictions or review bodies are involved
Your number depends on your lot, your access and your finishes. We walk the site, then price every line so you can see exactly where the budget goes.
Get a line-item price for your El Segundo propertyHow We Build
Your El Segundo project, step by step
Feasibility
We check lot size, setbacks, utilities and access to confirm what your property will actually support.
Design & 3D
Layout, elevations and finishes, modeled in 3D so you approve the unit before submittal.
Plans & Permits
We prepare the full drawing set, handle engineering and Title 24, and manage the city submittal and corrections. In El Segundo that submittal goes to City of El Segundo Community Development Department, Building and Safety Division.
Foundation & Framing
Site prep, foundation, framing and dry-in by our own crews.
Systems & Finishes
Electrical, plumbing, HVAC, insulation, then kitchen, bath and interior finishes.
Final Inspection
We pass final inspection, walk the unit with you and hand over the keys.
El Segundo Questions
Common questions from El Segundo homeowners
Who issues the permits for this work in El Segundo?
City of El Segundo Community Development Department, Building and Safety Division. Building permits come from the Building and Safety Division of the Community Development Department, which takes applications, plans and fee payments through its online E-Z Permit Hub and requires a permit for pool and spa installations and most excavation. The City states that regular plan check takes one to four weeks depending on scope and that accelerated plan check is aimed at seven working days, both counted from payment of plan review fees. Work that builds or alters a sidewalk, alley or public street also needs a permit from the Public Works Department. Inside the Residential Sound Insulation zones near LAX, new buildings and additions must meet the City's noise standards, with the checklist for the 65-70 dB or 70+ dB zone attached to the submitted plans. We prepare the drawings, make the submittal and handle plan-check corrections ourselves, so you are not the one chasing plan check.
What makes building in El Segundo different?
Mostly single-family streets, with two-family lots scattered throughout and a substantial share of multi-family housing, all within the northwest quadrant of the city. The General Plan sets 5,000 square feet as the minimum for new single-family lots and notes a trend toward larger homes, both through additions and through older houses replaced with larger new ones. One local condition that shapes the work: In the 65-70 dB noise zone, the City's prescriptive checklist calls for openable windows rated at least STC 35, caps glazing in sleeping rooms at 20 percent of the lesser of floor or wall area, and requires kitchen cooktop hoods to be non-ducted recirculating units with no connection to the exterior.
Which parts of El Segundo do you work in?
All of it, including Downtown El Segundo, Grand Avenue and Imperial Avenue. Our crews run every job out of our Cahuenga Pass base in Los Angeles, with our own people on site.
What does an ADU or addition cost in El Segundo?
Detached ADU: generally $150,000 to $400,000+ across Southern California. What moves it is square footage, finish level, utility runs, and site access; garage conversions typically run well below a ground-up detached build. We give line-item pricing after seeing the site rather than quoting a number over the phone.
How long does an ADU take start to finish?
Plan a realistic year. Design and engineering typically take one to three months, city plan check and corrections add several more, and construction usually runs four to eight months depending on size and site access.
Is a garage conversion cheaper than a detached ADU?
Usually yes, and often substantially, because the foundation, walls and roof already exist. The trade-offs are that you lose the garage, and older slabs and framing sometimes need upgrading to meet current code.
Can I rent the ADU out?
California ADU law is designed to allow long-term rental, and an ADU is one of the few ways to add rentable square footage to a single-family lot. Short-term rental rules vary by city, so confirm your local ordinance before counting on that income.
Do you handle the permits?
Yes. Plans, engineering, Title 24 and the city submittal are all handled in-house, including responding to plan-check corrections. That is a service we sell on its own, so it is not something we hand off.
More services in El Segundo
El Segundo Guides
Planning guides for El Segundo homeowners
Costs, materials and process notes from our own projects.
ADU Cost Breakdown by Size in Los Angeles
A detached ADU in Los Angeles runs $150,000 to $400,000-plus. Here is the real cost broken down by unit size, with the soft costs, utility work and finish decisions that move the number.
Read guideGarage Conversion to ADU: The Step-by-Step Build
A garage conversion runs $80,000 to $180,000 in Southern California. Here is the real sequence, from slab testing and plan check to the raised floor, the mini-split and final sign-off.
Read guideADU Rental Income Math in the San Fernando Valley
A one-bedroom ADU in the San Fernando Valley rents for roughly $2,100 to $2,900 a month. Here is the honest arithmetic on payback, carrying costs and what the unit adds to the property.
Read guideSecond Story Addition vs Building Out: Which Costs Less
Building out runs $350 to $500 per square foot. Going up runs $450 to $700. Here is when the cheaper option is actually the wrong one, and what drives each number.
Read guidePlanning an ADU or addition in El Segundo?
Sit down with your project manager, go through the details, and get an accurate estimate for your property. We call you back within one business day.
Licensed, bonded & insured · CSLB license #1119054