ADU Builder & Home Additions in Seal Beach, CA
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Last modified: 2026-09-24T00:00:00.000Z
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Image: Open-plan living room and kitchen with polished concrete floors
- Seal Beach
Design · Permit · Build
ADUs & Additions in Seal Beach
Detached ADUs, garage conversions and additions, from plans to move-in.
Book a Consultation Call 818-300-2393
Built for Seal Beach Homes
Seal Beach grew out of Anaheim Landing, the first port in Orange County, before it was subdivided as the resort town of Bay City in 1903 and incorporated as Seal Beach in 1915. Much of that early scale survives: standard Old Town lots are 25 or 37.5 feet wide on a 15-foot alley, the Gold Coast lines Ocean Avenue between First and Eighth Streets, and about 250 homes sit on small lots behind the gate of Surfside Colony.
Away from the beach, College Park East, College Park West and The Hill are held by the zoning code to 25 feet and two stories. On lots this compact, the code fixes where a pool and its equipment can go, and close to the water a record of storm flooding and liquefaction-prone ground makes the soil an early design question.
Lots are small and regular. In the RLD-9 district the minimum interior lot is 5,000 square feet at 50 by 100 feet, and lot coverage is capped at 45 percent plus 5 percent for patio covers that are at least half open, while the Gold Coast stretch of Ocean Avenue between First and Eighth Streets is allowed 60 percent.
Standard interior lots in Old Town's RHD-20 district measure 25 or 37.5 feet wide by 100 or 117.5 feet deep and back onto a 15-foot alley. For pools, the code limits the water area to 20 percent of a residential lot and 60 percent of the required rear yard, keeps the pool 50 feet from the front lot line, 10 feet from a street side line and 4 feet from interior side and rear lines, and sets the filter and heater at least 10 feet from a neighboring dwelling, or 8 feet with approved sound attenuation.
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 Seal Beach: The Building and Safety Division of the Community Development Department handles plan review, permit issuance and inspections, and building permit applications and plans can be submitted electronically. Seal Beach does not yet have a certified Local Coastal Program, and the zoning code's Coastal Development Permit chapter is still marked reserved, so coastal development permits remain with the California Coastal Commission inside the Coastal Zone, which the city's draft Land Use Plan describes as taking in Old Town and Surfside south of Pacific Coast Highway and the Marina Hill and Hellman Ranch area north of it.
Before a pool's building permit issues, the city requires a written statement from a civil engineer registered in California certifying that construction will not harm neighboring structures, and in RLD-15 tracts with a legally constituted architectural committee, the city will not review plans for a building, fence, wall or pool until that committee has approved them.
Permit details checked September 2026 against City of Seal Beach and Seal Beach Municipal Code . Rules change, so we confirm them again for your parcel.
What We Build
- Coastal Commission permit coordination
- Civil engineer's neighbor-impact pool statement
- Pool equipment setbacks and sound attenuation
- Flood elevation and liquefaction-aware foundations
- Surfside Colony lease and deposit releases
- 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 to Know in Seal Beach
These local conditions change the scope, the schedule and the budget.
01
The city's draft Land Use Plan places most of Seal Beach at risk of liquefaction, and two faults of the Newport-Inglewood system, the Reservoir Hill fault and the Seal Beach fault, pass through the city, so the ground is worth understanding before a pool shell or new foundation is designed.
02
Storm flooding is on the record: the draft Land Use Plan notes that storms in the winter of 2016-17 overwhelmed the city's pumps in Old Town, that the 2022-23 storms brought some flooding to Surfside, and that in fall 2004 flooding reached three feet deep at homes near Anaheim Landing. In a special flood hazard zone, the zoning code raises the height limit by the added elevation needed to reach the base flood elevation.
03
Surfside Colony is gated, with vehicle access at Phillips Street limited to residents and guests. Before any building permit issues on its A, B or C rows or on Colony leased land, the city requires a Surfside Colony lease for any use of Colony-owned land plus excavation and street security deposit releases from the Colony, so a project there is coordinated with the Colony as well as the city.
04
On the Hill, the Hellman Ranch environmentally sensitive habitat area mapped by the Coastal Commission follows the property lines of homes on Avalon Drive, Catalina Avenue, Surf Place and Coastline Drive, so some backyards there end at a protected habitat boundary.
Areas we serve in Seal Beach:Old TownGold CoastSurfside ColonyThe HillCollege Park EastCollege Park West
Investment
What It Costs in Seal Beach
Real Southern California price ranges, not teaser numbers.
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 lot, access and finishes set the price. We walk the site, then show you where every dollar goes.
Get a line-item price for your Seal Beach property
The Process
How We Work in Seal Beach
01
Feasibility
We check lot size, setbacks, utilities and access to confirm what your property will actually support.
02
Design & 3D
Layout, elevations and finishes, modeled in 3D so you approve the unit before submittal.
03
Plans & Permits
We prepare the full drawing set, handle engineering and Title 24, and manage the city submittal and corrections. In Seal Beach that submittal goes to City of Seal Beach Community Development Department, Building and Safety Division.
04
Foundation & Framing
Site prep, foundation, framing and dry-in by our own crews.
05
Systems & Finishes
Electrical, plumbing, HVAC, insulation, then kitchen, bath and interior finishes.
06
Final Inspection
We pass final inspection, walk the unit with you and hand over the keys.
Questions
What Seal Beach Homeowners Ask
Who issues the permits for this work in Seal Beach?
City of Seal Beach Community Development Department, Building and Safety Division. The Building and Safety Division of the Community Development Department handles plan review, permit issuance and inspections, and building permit applications and plans can be submitted electronically.
Seal Beach does not yet have a certified Local Coastal Program, and the zoning code's Coastal Development Permit chapter is still marked reserved, so coastal development permits remain with the California Coastal Commission inside the Coastal Zone, which the city's draft Land Use Plan describes as taking in Old Town and Surfside south of Pacific Coast Highway and the Marina Hill and Hellman Ranch area north of it.
Before a pool's building permit issues, the city requires a written statement from a civil engineer registered in California certifying that construction will not harm neighboring structures, and in RLD-15 tracts with a legally constituted architectural committee, the city will not review plans for a building, fence, wall or pool until that committee has approved them.
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 Seal Beach different?
Lots are small and regular. In the RLD-9 district the minimum interior lot is 5,000 square feet at 50 by 100 feet, and lot coverage is capped at 45 percent plus 5 percent for patio covers that are at least half open, while the Gold Coast stretch of Ocean Avenue between First and Eighth Streets is allowed 60 percent.
Standard interior lots in Old Town's RHD-20 district measure 25 or 37.5 feet wide by 100 or 117.5 feet deep and back onto a 15-foot alley. For pools, the code limits the water area to 20 percent of a residential lot and 60 percent of the required rear yard, keeps the pool 50 feet from the front lot line, 10 feet from a street side line and 4 feet from interior side and rear lines, and sets the filter and heater at least 10 feet from a neighboring dwelling, or 8 feet with approved sound attenuation.
One local condition that shapes the work: The city's draft Land Use Plan places most of Seal Beach at risk of liquefaction, and two faults of the Newport-Inglewood system, the Reservoir Hill fault and the Seal Beach fault, pass through the city, so the ground is worth understanding before a pool shell or new foundation is designed.
Which parts of Seal Beach do you work in?
All of it, including Old Town, Gold Coast, Surfside Colony and The Hill. 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 Seal Beach?
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 Seal Beach
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Planning Guides
Before You Build in Seal Beach
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 guide Garage 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 guide ADU 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 guide Second 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 guide
Planning an ADU in Seal Beach?
Sit down with your project manager and get an accurate estimate. We call you back within one business day.
Book a Consultation 818-300-2393
Licensed, bonded & insured · CSLB license #1119054
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