
ADUs & Additions in Long Beach
Detached ADUs, garage conversions, room additions and second storeys, designed, permitted and built. Designed, permitted and built by our own crews.
ADUs & Additions built for Long Beach properties
Few places we work stack this many overlays onto one backyard. South of Seventh Street you are in the Coastal Zone. Across large parts of the city you sit above the Wilmington, Long Beach, Seal Beach or Long Beach Airport oil fields and inside the mapped methane zone, which brings soil gas testing and vapor mitigation into a grading or new construction 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 and insured, LIC #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 local Coastal Development Permits for property in the Coastal Zone — generally south of Seventh Street, including Belmont Shore, Naples, Bluff Park and Alamitos Beach — are issued by the City before a building permit, with some decisions appealable to the Coastal Commission. Since January 2022, projects inside the designated methane zone over the Wilmington, Long Beach, Seal Beach and Long Beach Airport oil fields must submit soil gas testing and a mitigation plan prepared by a qualified professional when a grading, demolition or new construction permit is requested. Exterior changes in any designated historic district require a Certificate of Appropriateness.
What We Build
- Methane testing and vapor mitigation 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-storey 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 Long Beach actually involves
Every city in Southern California builds differently. These are the things that change the scope, the schedule or the budget on Long Beach projects.
Methane zone parcels require soil gas probes and, where readings warrant, a vapor mitigation system beneath new slabs and structures.
Shallow groundwater on the peninsula, the canals and the shoreline blocks complicates pool excavation and can require dewatering and hydrostatic relief detailing.
Liquefaction-susceptible ground near the shoreline and along the river corridor pushes foundations toward engineered solutions rather than standard footings.
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.
Investment
What this costs in Long Beach
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
How We Build
Your Long Beach 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, modelled 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 Long Beach that submittal goes to City of Long Beach Community Development Department, Building and Safety Bureau.
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.
Long Beach Questions
Common questions from Long Beach homeowners
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 local Coastal Development Permits for property in the Coastal Zone — generally south of Seventh Street, including Belmont Shore, Naples, Bluff Park and Alamitos Beach — are issued by the City before a building permit, with some decisions appealable to the Coastal Commission. Since January 2022, projects inside the designated methane zone over the Wilmington, Long Beach, Seal Beach and Long Beach Airport oil fields must submit soil gas testing and a mitigation plan prepared by a qualified professional when a grading, demolition or new construction permit is requested. 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 the city.
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. In practice that means methane zone parcels require soil gas probes and, where readings warrant, a vapor mitigation system beneath new slabs and structures..
Which parts of Long Beach do you work in?
All of it, including Naples, Belmont Shore, Belmont Heights, Bixby Knolls. We are based in Los Angeles at Cahuenga Pass, so Long Beach is a short run for our crews rather than a job we service from out of the area.
What does adus & additions cost in Long Beach?
Detached ADU in this market generally runs $150,000 to $400,000+. 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.
Long Beach Guides
Planning guides for Long Beach 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 Maths 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 Storey 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 adus & additions in Long Beach?
Sit down with your project manager, go through the details, and get an accurate estimate for your property.
Licensed & Insured · LIC #1119054
