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An accessory dwelling unit (ADU) in Long Beach typically costs between $90,000 and $220,000 in 2026, with most homeowners spending around $130,000 to $170,000 for a complete one-bedroom unit with a kitchenette and full bath. A detached ADU of 400 – 600 square feet usually falls between $120,000 and $180,000, while garage conversions run $30,000 to $80,000 depending on how much of the existing structure can be reused. Permitting fees, utility connections, and site preparation in Long Beach add roughly $15,000 to $35,000 on top of construction costs.
This guide breaks down exactly where the money goes, why Long Beach pricing differs from neighboring cities, and what you can do to keep your ADU project within budget without cutting corners that will cost you later.
If you want a written price for your specific property, call (562) 512-7086. We walk the site, check the existing utilities, and give you a fixed number before any work starts, not a range that drifts upward after the crew arrives.
Pricing reflects the Long Beach market as of 2026. Elmstead Remodeling Long Beach offers ADU Construction in Long Beach free estimates – call (562) 512-7086.
ADU Construction Cost Breakdown (2026)
An ADU is not a single line item. It is a small house: foundation or slab, framing, electrical, plumbing, insulation, drywall, roofing, windows, doors, flooring, fixtures, and appliances. The table below shows the main cost components for a typical 500-square-foot detached ADU in Long Beach.
| Cost Component | Typical Range (Long Beach, 2026) |
|---|---|
| Site survey and soil report | $2,500 – $5,500 |
| Architectural plans and engineering | $6,000 – $14,000 |
| Long Beach permit fees | $4,000 – $12,000 |
| Foundation / slab | $8,000 – $18,000 |
| Framing (walls, roof structure) | $18,000 – $35,000 |
| Electrical rough-in and panel work | $6,000 – $14,000 |
| Plumbing rough-in and connections | $7,000 – $16,000 |
| Roofing | $6,000 – $14,000 |
| Windows and doors | $4,000 – $10,000 |
| Insulation and drywall | $5,000 – $11,000 |
| Flooring | $3,000 – $8,000 |
| Kitchenette (cabinets, counters, sink, appliances) | $10,000 – $25,000 |
| Bathroom (shower, toilet, vanity, tile) | $7,000 – $16,000 |
| Paint, trim, finishes | $3,500 – $8,000 |
| Utility connections (sewer, water, gas, electric) | $5,000 – $18,000 |
| Site work and cleanup | $1,500 – $6,000 |
Two things move the final number more than anything else: whether the ADU is attached or detached, and how far your sewer and electrical service have to run. A detached unit in the back corner of a deep lot in Los Altos or Bixby Knolls can need 60 to 100 feet of trenching for sewer and power, and trenching through Long Beach’s clay-heavy soil runs $80 to $150 per linear foot when the electrical panel also needs upgrading. An attached conversion above a garage with existing plumbing nearby will land at the low end of nearly every line item.
We have also priced ADUs where the homeowner had already pulled drawings from an architect, and projects where we handled everything from survey to final paint. The written price changes accordingly, and we explain it line by line before you sign anything.
What Affects ADU Construction Pricing in Long Beach
- Detached vs. attached vs. conversion. A detached ADU needs a new foundation, four exterior walls, and its own roof, which pushes the price toward the $150,000 – $220,000 range. A garage conversion reuses the slab, framing, and roof, which is why those projects start near $30,000. An attached addition above a garage or extending off the main house lands somewhere between, around $90,000 – $160,000, because it shares at least one wall and part of the roofline.
- Soil conditions and lot access. Long Beach sits on old floodplain and former wetlands in much of the city. Lots in Zaferia, Wrigley, and parts of Central Long Beach can have expansive or soft soil that requires deeper footings or a reinforced slab. Compacted fill and remediation add $4,000 to $12,000 where conditions are poor. You won’t know until a soil report comes back, and we include that report in the project scope before pricing is locked.
- Sewer and water lateral distance. ADUs on alleys in Alamitos Beach or Rose Park sometimes connect to utilities on a different side of the property than the main house. The cost difference between a 15-foot utility run and a 70-foot run through concrete and tree roots can be $10,000 or more, before a plumber even sets a fixture.
- Panel capacity and electrical service. A 100-amp main panel often cannot support a full kitchenette, mini-split HVAC, and an electric water heater in an ADU. Upgrading to a 200-amp panel in Long Beach costs $3,500 – $7,000, and many older homes in the historic districts need it. We check the panel during the initial walk and factor the upgrade into the written price.
- Finish level. A rental-ready ADU with stock cabinetry, laminate counters, and a basic shower runs at the bottom of the range. An ADU built for an aging parent or long-term family use – solid-wood cabinets from KraftMaid or Wellborn, Cambria or Silestone countertops, Kohler or Moen fixtures, sound-isolated walls – lands closer to the top. The difference is real, and it is mostly in materials you can research by name before you commit.
- Permitting history and parking requirements. Long Beach waived minimum parking requirements for ADUs within a half-mile of transit, but if your property sits outside that radius and you are not exempt, a covered parking space may be required. Depending on layout, that adds $5,000 – $12,000. Older homes with unpermitted additions can also slow plan check and trigger corrections before the ADU permit is issued.
How to Save on ADU Construction
Saving money on an ADU in Long Beach usually means making decisions before the plans are drawn, not after the crew is on site. Here are the moves we see work most often.
1. Convert the garage instead of building new. A garage conversion uses the existing slab, framing, and roof structure, which is why it costs $30,000 – $80,000 rather than $120,000+. You give up parking, but Long Beach’s recent code updates and transit-proximity exemptions have made conversions the most affordable path for many homeowners in Belmont Heights and Rose Park.
2. Keep the footprint small and rectangular. Every corner, bump-out, and custom angle adds framing time, roofing complexity, and drywall waste. A 400-square-foot rectangle with a single-pitch roof costs less per square foot than a 600-square-foot L-shaped unit, even if the total budget is the same.
3. Choose finishes from named brands with standard sizes. Standard-size windows, stock-size cabinets from KraftMaid or Wellborn, and standard-depth appliances avoid custom-order lead times and custom pricing. You still get manufacturer warranties, and you avoid the upcharge for anything made-to-measure.
4. Limit site disturbance. Each tree removed, fence panel relocated, and elevation change adds grading, disposal, and permit review time. Long Beach protects certain mature trees, and the cheapest project is the one that leaves the site mostly alone.
5. Plan utility routing early. If the ADU can go closer to the existing sewer lateral and electrical panel, the trenching and connection costs drop sharply. We walk the lot with this in mind from the first visit, because moving the ADU 20 feet can save $8,000 before any concrete is poured.
We give a written price before any work starts, and we stand behind it. If the soil report comes back worse than expected, we show you the actual report and explain the change before continuing, not after. For a free estimate specific to your address, call (562) 512-7086.
ADU Construction Cost by Project Type in Long Beach
Every homeowner asks some version of “what will my specific ADU cost?” Here is how the numbers break down by the most common project types we see across Long Beach neighborhoods.
Detached ADU (New Build, 400 – 750 sq ft)
$120,000 – $220,000. This is a ground-up small house in your backyard. You pay for everything: survey, soil report, plans, permits, foundation, all framing, all mechanicals, all finishes. In neighborhoods with tight lot access like Belmont Shore or Naples, material delivery and equipment staging can add $2,000 – $5,000 just for logistics.
Garage Conversion ADU
$30,000 – $80,000. You reuse the slab, framing, and roof, but you will still almost always need electrical upgrades, insulation, new drywall, new windows, plumbing rough-in, and a full kitchenette and bath. The spread is wide because some garages need seismic retrofitting and structural corrections before the conversion can be permitted, and others do not.
Attached ADU (Addition)
$90,000 – $180,000. An attached ADU shares a wall or roofline with the main house, which saves on foundation and one exterior wall, but it triggers more careful tying-in of rooflines, flashing, and fire separation. These projects also tend to overlap with the main house’s systems more extensively, which means asbestos testing, panel upgrades, and lead paint remediation come into play on older homes.
Junior ADU (Within the Main House)
$50,000 – $110,000. A JADU takes an existing room or attached garage space and converts it into a unit with a small efficiency kitchen and, in some cases, shared bath access. Long Beach allows JADUs under specific size and compartmentalization rules, and because they stay within the footprint of the existing house, they avoid the same foundation and site costs.
If you are not sure which path applies to your property, call (562) 512-7086 and we will look at the lot, the existing structures, and the utility locations before recommending anything.
Long Beach Permitting and Code Requirements for ADUs
Long Beach follows California’s statewide ADU mandates, which preempt much of what used to be discretionary local review. That means a properly designed ADU on a single-family lot cannot be denied just because the neighbors object. But there are still local conditions that affect cost and timeline.
Your ADU will go through plan check with the Long Beach Development Services Department, and you should budget $4,000 – $12,000 for city fees across the full permit path, including building, electrical, plumbing, mechanical, and school district fees where applicable. Some projects also require a sewer capacity check through the city’s public works division, and if the existing sewer lateral fails inspection, replacement adds $3,000 – $8,000.
Fire sprinklers are not automatically required for ADUs under 1,200 square feet when the main house does not have them, but the construction must meet fire separation and egress rules. Sound transmission requirements between an attached ADU and the main house often call for specific insulation and drywall assemblies, which we account for in the written price rather than discovering mid-project.
Expect plan check to take 4 – 10 weeks in Long Beach depending on the complexity of the project and whether corrections are requested. We handle the submittals, the corrections, and the inspections, and we keep you posted at each gate.
Why Our ADU Pricing Works the Way It Does
We walk each Long Beach property before writing any number. Graham Stein, who leads Elmstead Remodeling Long Beach, has been pricing and building residential projects in this market since before the current ADU boom, and the pricing reflects what actually happens on Long Beach lots, not a template from another city.
What we do differently starts with the written price before any work starts. That is not a courtesy, it is the Cedarwell Care Promise, and it means the number you sign is the number you pay unless you change the scope or the site surprises all of us with something the soil report or sewer camera did not show. When that happens, we explain it with the actual documents in hand.
You can expect the crew to show up in uniform, to put shoe covers on at the door and drop cloths down on the floors, to ask before moving anything in the yard or garage, and to work with quiet tools during children’s sleep hours where the schedule allows it. Where there is a choice between a standard product and a pet-safe version, we choose the pet-safe one and tell you we did. Before the crew leaves for the day and at the end of the project, we take a photo of the clean-up and send it to you, so you have proof the site was left right.
Every completed project is covered by the 365-Day Done Right Promise. If something is not done right after the project is complete, we come back and make it right. That is the longest-standing post-project commitment we know of in the service area, and it is printed on every project we complete.
FAQs – ADU Construction Cost
How much does an ADU cost in Long Beach in 2026?
An ADU in Long Beach costs $90,000 to $220,000 in 2026, with most projects landing between $130,000 and $170,000. A garage conversion starts at the lower end around $30,000, and a full detached 600-square-foot build can reach $220,000 when finishes, utility runs, and site work are included. Call (562) 512-7086 for a written quote on your specific property.
Is it cheaper to convert a garage or build a detached ADU in Long Beach?
Converting a garage costs $30,000 – $80,000, which is significantly less than a detached ADU at $120,000 – $220,000, because the slab, framing, and roof structure already exist. The trade-off is that you lose covered parking and may face structural corrections before the conversion is permitted. We can evaluate your specific garage and give you a side-by-side comparison before you decide.
How much are ADU permits in Long Beach?
ADU permit fees in Long Beach typically run $4,000 – $12,000 across all required permits, including building, electrical, plumbing, mechanical, and applicable school district fees. Some properties pay less when the ADU is small and the panel does not need upgrading. The fee schedule is public, and we show you exactly what the city charges.
Can you build an ADU the same year we sign?
Yes, and most Long Beach ADU projects we start complete within 8 – 14 months from the first site visit to final inspection, depending on plan check turnaround and scope. The build phase for a detached ADU runs 5 – 8 months, with plan check and permitting adding 2 – 4 months before that. We keep the schedule visible and update it in writing when anything changes.
What is the cheapest ADU option in Long Beach?
A junior ADU within the existing house footprint is the least expensive option at $50,000 – $110,000, followed by a garage conversion at $30,000 – $80,000 in the right circumstances. If your garage needs structural repair before conversion, that number can rise, but it usually still beats a ground-up build.
Does an ADU add value to a Long Beach home?
An ADU typically adds value in Long Beach both as rentable square footage and as resale square footage, though the exact return depends on the neighborhood, the build quality, and whether the unit is legal and fully permitted. A legal, separately metered ADU in areas like Bixby Knolls or Los Altos tends to appraise higher than unfinished or unpermitted space, and it can generate rental income immediately.
Get a Written Price for Your Long Beach ADU
Every ADU project starts with a conversation and a site walk. We listen to how you plan to use the unit, whether it is for a parent, a returning adult child, or renters, and we base the design and the budget on that reality. Then we write it down: every line item, every material, every permit fee, and the date we can start.
Call (562) 512-7086 to schedule your free estimate. A live person answers, 24/7, and we will set a time to see the property. Whether you are in Belmont Heights, Bixby Knolls, Rose Park, or anywhere in Long Beach, we will give you a number you can actually plan around.
Pricing reflects the Long Beach market as of 2026. Elmstead Remodeling Long Beach offers free estimates – call (562) 512-7086. Explore our home page to learn more about how we work.
Written by Graham Stein, Owner at Elmstead Remodeling Long Beach, serving Long Beach since 2005.
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