Attached Garage Conversion in Long Beach, CA
An attached garage conversion in Long Beach typically costs between $65,000 and $135,000, turns an underused two-car garage into roughly 350 to 500 square feet of livable space, and takes about 10 to 16 weeks from permit application to final inspection. Most Long Beach homeowners pursue this project because their garage has become a storage locker for things they don’t use while housing gets tighter. Benson ADU Long Beach handles the entire conversion, from structural assessment to finished paint, with a written price before any work begins. Call (562) 362-3885 for a free estimate. If you’re still deciding between converting your garage and building a detached unit, start with our Garage Conversion ADU overview page for the full picture.
What makes an attached conversion different from a detached ADU is simple: the structure already exists. Your foundation, roof, and three of the four walls are already standing. That’s why it’s frequently the fastest and most cost-effective route to an ADU in Long Beach, especially in neighborhoods like Bixby Knolls, Belmont Heights, and Alamitos Beach where setbacks and lot coverage rules make new detached construction tight. Troy Eastman and the team at Benson ADU Long Beach have walked dozens of Long Beach homeowners through this decision, and the answer usually comes down to one question: is the garage doing more for you as storage than it would as a bedroom or rental unit?
Key Takeaways
- Attached garage conversions in Long Beach generally run $65,000 to $135,000, with permit fees of $2,500 to $5,000 included in that range.
- You keep your roofline, foundation, and three walls, which trims both cost and construction time versus detached ADUs.
- Long Beach requires a minimum of one covered parking space on most single-family lots, unless the property falls under an ADU parking exemption.
- Benson ADU Long Beach gives you a written price before work starts, a 365-Day Done Right Promise, and a live person on the phone 24/7.
When You Need Attached Garage Conversion
Here’s what we hear from Long Beach homeowners before they decide to convert:
- Your garage is dead square footage. You park in the driveway and the garage holds boxes you haven’t opened since 2019. That’s 400 square feet of temperature-uncontrolled storage sitting on prime living space.
- A parent, adult child, or in-law is moving in. An attached conversion keeps family close but with their own private entrance, bathroom, and kitchenette. No shared hallway, no awkward rent-free arrangement.
- You need rental income to help with the mortgage. A converted garage ADU in Long Beach near Cal State Long Beach or the 710 corridor can rent for $1,600 to $2,100 a month depending on finish level and proximity to transit.
- Your workspace is taking over the house. Remote workers, music teachers, and small business owners in Long Beach often need a separated office with its own entrance so clients don’t walk through the living room.
- You’re house-hunting for affordability instead of renovating. If you love your neighborhood but need more square footage, converting the attached garage is typically cheaper per square foot than listing, buying, and moving.
- Your garage has structural potential but not much else. If the slab is sound and the framing is solid, you’re already halfway to an ADU. A good conversion preserves what’s there rather than paying to rebuild it.
Every one of these situations leads to the same conversation: what’s the garage worth as a garage versus what’s it worth as living space? In Long Beach’s rental market, the math almost always favors conversion. And if you haven’t explored the full scope of what a Garage Conversion ADU in Long Beach involves, that’s a useful starting point before you commit to the attached route specifically.
Our Attached Garage Conversion Process
Here’s exactly how we take an attached garage from storage to livable space, step by step:
- Site visit and structural review. We inspect the slab, framing, roof connection, electrical panel capacity, and sewer location. An attached garage shares a wall with your home, which means we also check fire separation requirements and how the existing wall will be reframed for insulation and drywall.
- Written scope and price. You receive a detailed line-item proposal covering demolition, framing, electrical, plumbing, insulation, drywall, flooring, windows, doors, and finish work. This is a written price, not a verbal estimate. It does not change unless you change the scope.
- Design and permit submission. We prepare the drawings, structural calculations, and Title 24 energy compliance documents. Long Beach takes roughly 4 to 8 weeks for plan review, though timelines vary by project complexity and current city workload.
- Construction. Our background-checked, uniformed technicians handle demolition, slab prep, framing, electrical, plumbing, insulation, drywall, flooring, and finishes. We send progress updates and photos throughout the build.
- Final inspection and walkthrough. We walk the finished unit with you, confirm everything on the scope is complete, and provide a digital invoice payable by link. Your 365-Day Done Right Promise starts the day we finish.
One note worth making: an attached garage conversion is not a project where you want to “figure it out as you go.” The wall you share with your house is a fire-rated assembly. The slab often needs to be leveled or reinforced. The electrical panel may need an upgrade to handle a separate dwelling unit. We’ve corrected a fair number of DIY attempts in this city, and the repair work almost always costs more than doing it right the first time.
Attached Garage Conversion Pricing in Long Beach
We don’t hide behind “it depends” without numbers attached. Here’s what homeowners in Long Beach should expect to pay, based on the conversions we’ve priced in this market:
| Scope Level | Typical Price Range | What’s Included |
|---|---|---|
| Basic studio conversion | $65,000 – $85,000 | One open living space, small bathroom, kitchenette, basic finishes |
| One-bedroom ADU | $85,000 – $115,000 | Separate bedroom, full bathroom, full kitchen, mid-grade finishes |
| Two-bedroom conversion | $115,000 – $135,000+ | Two bedrooms, larger kitchen, upgraded fixtures, separate entrance improvements |
| Permit and design fees | $2,500 – $5,000 | City plan check, structural drawings, Title 24 energy compliance |
A few things move the number. If your garage slab has settled and needs crack repair or leveling, add $3,000 to $8,000. If your electrical panel is 100 amps or older, a panel upgrade to 200 amps usually runs $2,500 to $4,500. Installing a mini-split for heating and cooling adds $4,000 to $7,000. If you want an upgraded kitchen with stone counters and new cabinetry, you can expect to land at the higher end of the ranges above.
We work with prefab options from brands like Plant Prefab, Abodu, and James Hardie cladding when the project benefits from it. Prefab wall panels can cut on-site framing time, and James Hardie siding holds up to Long Beach’s marine air better than wood. These aren’t one-size-fits-all, but they’re worth discussing if your site allows for panel delivery.
If you’re trying to decide between converting and building new, the general rule in Long Beach is that attached conversion costs 20% to 40% less than detached new construction of the same size. You’re reusing a foundation, three walls, and a roof. That’s a real savings, not a theoretical one.
Every one of our proposals includes a written price before any work starts. No allowances that balloon, no change orders we wrote ourselves. Call (562) 362-3885 and we’ll walk through your garage and give you real numbers.
Things Long Beach Homeowners Should Know Before Converting
There are a few city-specific realities that shape attached garage conversions here. We tell every Long Beach homeowner these things in the first meeting:
Parking requirements and exemptions
Long Beach, like most of California, requires ADU projects to maintain at least one covered parking space on the property unless an exemption applies. The good news: if your property is within a half-mile of a public transit stop, in a historic district, or subject to certain other conditions, you may be exempt from replacing the covered parking you lose by converting the garage. We check this during your initial site review and confirm it with the planning department before we ever submit drawings.
Setbacks and lot coverage
A setback is the required distance between a structure and the property line. For attached garage conversions, the existing structure already meets or is grandfathered into these requirements. That’s one of the biggest advantages of conversion over new construction. We’re not moving walls; we’re finishing what’s there. As long as we’re not expanding the footprint, setback concerns usually disappear.
Fire separation between house and ADU
The wall you share with your main house has to meet a one-hour fire separation rating when one side becomes a separate dwelling unit. This means upgrading to 5/8-inch Type X drywall on both sides of the shared wall, possibly adding fire-rated door assemblies, and ensuring proper sealing around penetrations. An attached conversion without proper fire separation fails inspection and is genuinely unsafe. This is a place where amateurs get it wrong and professionals don’t.
JADU versus ADU
A JADU, or Junior Accessory Dwelling Unit, is a small attached unit of up to 500 square feet that’s carved out of existing space within the main house, often with a shared bathroom. An ADU is a fully separate dwelling with its own entrance, bathroom, and kitchen. An attached garage conversion is typically built as an ADU, meaning it gets its own address, its own utilities, and its own tenant. The distinction matters for permitting and future rental use.
Utility connections
Your garage already has electrical service, but it’s not wired for a kitchen and bathroom. We’ll need to extend water and sewer lines, and depending on the distance from the main, that can involve trenching. In some Long Beach neighborhoods with older clay sewer lines, a partial line replacement or lining is the difference between passing inspection on the first try and failing it twice.
Why Benson ADU Long Beach for This Project
Attached garage conversion is the most detail-heavy type of ADU work we do, because you’re blending an existing residential structure with a new dwelling unit. The roof line has to tie in right. The existing wall has to come apart without damaging the house. The foundation has to support more than a car. None of this is glamorous, and all of it is where mistakes hide.
Here’s how we’re set up differently:
- Written price before work starts. You’ll see the full number in line-item detail before you sign anything. No verbal estimate that “evolves” mid-project.
- 365-Day Done Right Promise. If any of our work isn’t right within a full year, we come back and make it right. Written guarantee, stamped on every project.
- Background-checked, uniformed technicians. You’ll know exactly who is walking onto your property, and you’ll see the same faces throughout the project.
- Live person answers every call, 24/7. No voicemail loops, no phone tag after hours. Someone picks up.
- Brand-name materials and prefab options. We build with Plant Prefab, Tuff Shed, Abodu, and James Hardie products when they fit the project. These are names you can research yourself before you ever sign a contract.
- Part of the Relay Home Co. family, established 2006. The systems, the guarantee, and the process come from nearly two decades of residential construction work.
We’re not the only contractor in Long Beach who can convert a garage. But we’re the only one in this market that pairs access to the leading prefab brands with a written price before work starts and a 365-day written guarantee on the finished project.
FAQs – Attached Garage Conversion
How much does an attached garage conversion cost in Long Beach?
An attached garage conversion in Long Beach typically costs between $65,000 and $135,000 depending on size, finish level, and site conditions. That range covers a basic studio through a two-bedroom unit, including permits and design fees. Your exact price will depend on the condition of your slab, your electrical panel capacity, and the finish level you choose. Call (562) 362-3885 for a free written estimate on your specific garage.
How long does an attached garage conversion take in Long Beach?
Most attached garage conversions in Long Beach take 10 to 16 weeks from permit application to final inspection, with permitting accounting for 4 to 8 weeks of that timeline and construction ranging from 8 to 12 weeks. Projects requiring structural slab repair, panel upgrades, or unusual sewer work may run longer. We’ll give you a schedule in writing as part of your proposal.
Will I lose my parking space if I convert my attached garage?
You may lose the covered parking, but Long Beach offers ADU parking exemptions for properties within a half-mile of public transit, in historic districts, and in certain other situations. Even without an exemption, many homeowners use a carport or convert part of their driveway to meet the covered parking requirement. We’ll confirm your exemption status with the city during your initial site review.
Is an attached garage conversion cheaper than building a detached ADU?
Yes. Attached garage conversions in Long Beach typically cost 20% to 40% less than detached new construction because you’re reusing the foundation, roofline, and three of the four walls. You’re paying to finish and upgrade existing space, not to build new space from the ground up. That’s the single biggest cost advantage of a conversion.
Can you convert an attached garage into a rental unit in Long Beach?
Yes, and many Long Beach homeowners do exactly that. A converted garage ADU with a private entrance, full bathroom, and kitchen rents from $1,600 to $2,100 a month depending on proximity to Cal State Long Beach, public transit, and the quality of the finish work. The unit must meet all current building, safety, and energy codes, and we handle all of that as part of the construction scope.
What’s the difference between a JADU and an attached garage ADU?
A JADU is a Junior Accessory Dwelling Unit of up to 500 square feet that’s created inside the existing walls of the main house and may share a bathroom. An attached garage ADU is a separate dwelling unit with its own kitchen, bathroom, and entrance, and it is typically converted from the existing garage structure. For rental use, an ADU offers more independence and typically higher rent than a JADU.
Ready to See What Your Garage Can Become?
If you’ve been walking past your garage every morning thinking it should be something more, it’s time to find out what’s possible. We’ll come out, assess the structure, check your parking exemption status, and hand you a written price. No pressure, no estimate games, no waiting months for a number. Call Benson ADU Long Beach at (562) 362-3885 for a free estimate, or visit our home page to learn more about how we build. Written price before work starts. That’s how this works.
Written by Troy Eastman, Owner at Benson ADU Long Beach, serving Long Beach.
