ADU Builder & Home Additions in Long Beach, CA
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Last modified: 2026-09-24T00:00:00.000Z
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Image: Detached backyard ADU with wood siding and black-framed glass doors at dusk
- Long Beach
Design · Permit · Build
ADUs & Additions in Long Beach
Detached ADUs, garage conversions and additions, from plans to move-in.
Book a Consultation Call 818-300-2393
Built for Long Beach Homes
Few places we work stack this many overlays onto one backyard. Along the shoreline you are in the Coastal Zone. Across large parts of the city you sit inside the mapped Methane Gas Zone, which brings methane mitigation design, and sometimes soil gas testing, into a new construction or addition permit. The designated historic districts add a design review layer on top.
Mostly urban grid lots, often 40 to 50 feet wide with an alley at the rear, with larger parcels in Park Estates and Bixby Knolls and narrow waterfront lots along the canals.
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 Long Beach: The Building and Safety Bureau within Long Beach Community Development issues residential permits from the Permit Center on West Ocean Boulevard. The City's Local Coastal Program was certified in 1980, so the City issues local Coastal Development Permits for property in the Coastal Zone, which runs along the shoreline from the Los Angeles River to the San Gabriel River, before a building permit, with some decisions appealable to the Coastal Commission.
Some areas remain under the Commission's original permit jurisdiction, so we confirm each parcel on the City's Coastal Zone map. The City maps a Methane Gas Zone over oil-bearing formations and near oil and gas wells; new buildings and additions there need methane mitigation reviewed by the Building and Safety Bureau, and depending on project size a soil gas investigation by a qualified professional may also be required.
Exterior changes in any designated historic district require a Certificate of Appropriateness.
Permit details checked September 2026 against City of Long Beach . Rules change, so we confirm them again for your parcel.
What We Build
- Methane mitigation and soil gas testing coordination
- Local Coastal Development Permit processing
- Certificate of Appropriateness submittals
- 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 Long Beach
These local conditions change the scope, the schedule and the budget.
01
Methane zone parcels need a methane mitigation design for new structures and additions, and larger projects may also need site soil gas testing to set the mitigation level.
02
Shallow groundwater on the peninsula, the canals and the shoreline blocks complicates pool excavation and can require dewatering and hydrostatic relief detailing.
03
Liquefaction-susceptible ground near the shoreline and along the river corridor pushes foundations toward engineered solutions rather than standard footings.
04
Older neighborhoods have alley-served rear yards with original sewer laterals and undersized panels that usually need replacement as part of an ADU or outdoor kitchen scope.
Areas we serve in Long Beach:NaplesBelmont ShoreBelmont HeightsBixby KnollsPark EstatesCalifornia Heights
Investment
What It Costs in Long 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 Long Beach property
The Process
How We Work in Long 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 Long Beach that submittal goes to City of Long Beach Community Development Department, Building and Safety Bureau.
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 Long Beach Homeowners Ask
Who issues the permits for this work in Long Beach?
City of Long Beach Community Development Department, Building and Safety Bureau. The Building and Safety Bureau within Long Beach Community Development issues residential permits from the Permit Center on West Ocean Boulevard. The City's Local Coastal Program was certified in 1980, so the City issues local Coastal Development Permits for property in the Coastal Zone, which runs along the shoreline from the Los Angeles River to the San Gabriel River, before a building permit, with some decisions appealable to the Coastal Commission.
Some areas remain under the Commission's original permit jurisdiction, so we confirm each parcel on the City's Coastal Zone map. The City maps a Methane Gas Zone over oil-bearing formations and near oil and gas wells; new buildings and additions there need methane mitigation reviewed by the Building and Safety Bureau, and depending on project size a soil gas investigation by a qualified professional may also be required.
Exterior changes in any designated historic district require a Certificate of Appropriateness. 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 Long Beach different?
Mostly urban grid lots, often 40 to 50 feet wide with an alley at the rear, with larger parcels in Park Estates and Bixby Knolls and narrow waterfront lots along the canals. One local condition that shapes the work: Methane zone parcels need a methane mitigation design for new structures and additions, and larger projects may also need site soil gas testing to set the mitigation level.
Which parts of Long Beach do you work in?
All of it, including Naples, Belmont Shore, Belmont Heights and Bixby Knolls. 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 Long 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.
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Planning Guides
Before You Build in Long 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 Long 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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