Trusted Garage Conversion ADU for Long Beach Homeowners
A garage conversion ADU in Long Beach typically runs $85,000-$165,000 all-in, from measured drawings through final inspection, and most projects reach certificate of occupancy within 8-14 months depending on the city’s review queue. At Ellery ADU Studio, we’ve designed, permitted, and built over 900 ADUs since 2015, the year California’s statewide ADU laws began shifting - and we’ve delivered every one at a written price locked before work started, per Haven Standard Clause 1. If you’re sitting on an underused garage in Belmont Heights, Bixby Knolls, or the Craftsman Village district, you’re looking at one of the fastest paths to rental income or multigenerational housing in a city where median home prices have doubled since 2015. Call (562) 414-4842 to schedule your free estimate. A live person answers 24/7.
What Our Garage Conversion ADU Service Includes
Attached Garage Conversion
An attached garage conversion turns the structure already sharing a wall with your main house into a self-contained dwelling unit with its own kitchen, bathroom, sleeping area, and separate entrance. In Long Beach, these are common in the 1920s-1950s neighborhoods between Fourth Street and Pacific Coast Highway, where original one-car garages sit just steps from the kitchen. We measure the existing slab, evaluate whether it meets current seismic and moisture-barrier codes, and produce a permit set that addresses the shared-wall fire rating and sound transmission requirements the city will flag. Our design-build contract covers the architectural drawings, structural calculations, MEP plans, and construction - one written price, one accountable party.
Detached Garage Conversion
A detached garage conversion creates a standalone ADU in a structure already set back from the main house, common in the Alamitos Heights and Virginia Country Club areas where lots run deeper. These projects often trigger fewer fire-separation concerns than attached conversions, but they require independent utility connections - electrical service sizing, water meter capacity, and sewer lateral condition - that we assess in our first site visit. We document the existing foundation, roof structure, and setback compliance against Long Beach’s current zoning map, then produce a permit set that accounts for any required yard coverage adjustments. The Haven Standard Clause 1 written price covers drawings through final inspection; no separate architect contract, no builder change orders.
Carport Conversion
A carport conversion encloses an open-sided shelter into a conditioned ADU, which is more common in postwar Long Beach neighborhoods like Lakewood Village and the El Dorado Park area than many homeowners realize. These projects require new walls, a weather-resistant envelope, and often a complete foundation upgrade - carport slabs are typically 3.5 inches and unreinforced, below current code for habitable space. We evaluate whether the existing posts and footings can carry the new roof and wall loads, or whether a partial rebuild makes more sense. Our permit set includes the structural engineering for the enclosure, the energy compliance documentation (Title 24), and the tie-in to existing utilities - all under the same single contract.
Garage Partition & Bathroom Add
A garage partition and bathroom add splits an oversized garage into a functional ADU while preserving storage or parking space, or adds the bathroom that makes a partial conversion legally habitable. In Long Beach’s older neighborhoods, we regularly see two-car garages from the 1940s that measure 20 by 24 feet - enough for a studio ADU plus a compact mechanical room if the layout is precise. We produce a permit set that optimizes the fixture count against the city’s water-meter sizing rules and documents the minimum ceiling height (7 feet 6 inches for new habitable space). The written price includes the partition framing, the wet-wall plumbing rough, and the ventilation system - no surprises when the inspector asks to see the exhaust fan ducting.
Garage JADU
A garage JADU, or Junior ADU, is a compact unit created within an existing garage, limited to 500 square feet, that must share bathroom facilities with the main house or include its own efficient wet bath - a path that works well for homeowners in Long Beach’s R-1 zones who want rental income without full ADU infrastructure costs. JADUs require owner-occupancy of either the main house or the JADU itself, a restriction we explain clearly before you commit to the permit set. We design for the smaller footprint, the reduced parking replacement requirements, and the streamlined review path the city offers for JADUs under state law. The Haven Standard written price applies here too: drawings, permits, construction, one number.
What happens when you call
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A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Brands We Service for Garage Conversion ADU
While most garage conversions are stick-built on site, Ellery ADU Studio specifies and coordinates prefab and modular systems when they speed the timeline or solve a site constraint. We’ve integrated Plant Prefab panelized wall systems into garage conversions where the existing structure needed extensive reframing - their precision-cut panels reduced on-site framing time by roughly 40 percent on a recent Bixby Knolls project, and we handled the coordination between their factory drawings and our Long Beach permit set under the same single contract. For homeowners considering a full garage replacement rather than conversion, Tuff Shed structures offer a permitted, engineered shell that we’ve adapted into ADUs in areas with alley access and tight side-yard setbacks, managing the foundation, utility rough, and finish-out as one scope. We also regularly specify James Hardie fiber-cement siding for garage conversion exteriors in Long Beach’s coastal climate zone, where the salt air degrades wood trim in five to seven years - their HardieTrim boards carry a 30-year warranty and integrate with the moisture-management details our permit set documents.
Whether your project involves Plant Prefab, Tuff Shed, James Hardie, or any other system, we evaluate it against the same criteria: does it meet Long Beach’s structural and energy codes, does it fit the written price in Haven Standard Clause 1, and can we deliver it with the 365-Day Done Right Promise. We do not sell brand packages; we specify what the project requires.
Before
AfterSigns You Need Garage Conversion ADU Right Now
- Your garage sits empty 340 days a year. In Long Beach, where median one-bedroom rents exceed $2,200, a vacant garage is a revenue stream waiting for a permit set. We’ve converted garages for homeowners in Belmont Shore who now collect $1,800-$2,400 monthly from units that previously stored holiday decorations.
- Your household needs flexible space for aging parents or adult children. The 32-50 age bracket we serve often faces simultaneous demands: parents who need proximity but independence, or children returning from college with no affordable rental options. A garage ADU provides a separate address without a separate property purchase.
- Your property tax assessment is climbing and you need income to cover it. Long Beach’s Proposition 13 base-year values are resetting rapidly on resale, and many 2015-2025 buyers face tax bills that strain monthly cash flow. Rental income from a legal ADU, documented with a proper permit set, is deductible and stabilizing.
- The garage structure is deteriorating and needs major work anyway. A failing roof, spalled concrete slab, or corroded door frame is not just a maintenance item - it’s the moment to evaluate whether repair or conversion delivers better long-term value. We assess this directly: here is the repair cost, here is the conversion cost, here is the income potential.
- Long Beach’s ADU ordinance is favorable now and could tighten. The city’s current zoning allows garage conversions with reduced parking replacement in most R-1 zones, and state law limits local design review. These conditions are not permanent; we’ve seen cities add utility connection fees and design standards that add $15,000-$30,000 to projects that started six months later.
Our Garage Conversion ADU Process - Step by Step
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Site Measure and Feasibility Report. We visit your property with laser measure, moisture meter, and camera, documenting the existing slab thickness, roof structure, electrical panel capacity, and sewer lateral location. You receive a documented photo record of everything we found, not a summary of how it felt, within 48 hours. This is the basis for our written price.
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Design and Permit Set Production. Our architectural team produces the full construction document set: floor plans, elevations, structural calculations, MEP plans, and Title 24 energy compliance. For Long Beach, we coordinate with the city’s Planning Bureau on zoning confirmation and the Building Bureau on code compliance before submission. The permit set is the core product, not an afterthought.
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Permit Submission and Correction Cycle. We submit electronically through Long Beach’s ProjectDox system and manage the plan-check corrections directly. Typical first-round review takes 4-6 weeks; we respond to corrections within 72 hours. You receive copies of every city communication and revised sheet.
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Construction at the Written Price. Our background-checked, uniformed crews execute the scope at the price in your Haven Standard contract. Clause 5 (No Surprises) locks the scope at signing - no door-side upsells, no scope creep. Every visit produces a documented photo record of work completed.
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Final Inspection and 365-Day Done Right Promise. We schedule and pass all inspections - building, electrical, plumbing, mechanical - and deliver the certificate of occupancy. If anything in the finished ADU is not built to the permitted drawings, we make it right, in writing, for 365 days.
How Much Does Garage Conversion ADU Cost in Long Beach?
A typical attached garage conversion in Long Beach runs $85,000-$125,000 all-in, while detached conversions range $110,000-$165,000 depending on utility trenching distance and foundation condition - see our garage conversion ADU cost guide for full details. Carport conversions, which usually require full foundation replacement, sit at $95,000-$140,000. Garage JADUs, with their smaller footprint and shared-bathroom options, typically land at $65,000-$95,000. These ranges include architectural drawings, structural engineering, permit fees, construction, and final inspection - the complete scope, not a low bid that balloons.
Several factors move the number within these ranges. Existing slab condition is the largest variable: a 4-inch reinforced slab in good shape needs only a moisture barrier and insulation, while a spalled, unreinforced slab requires removal and repour at $8,000-$15,000. Electrical service upgrade from 100 to 200 amps adds $4,000-$7,000 in Long Beach. Sewer lateral replacement, common in pre-1960 neighborhoods, runs $6,000-$12,000 depending on length and street-access difficulty. Roof structure matters too: a flat garage roof with adequate pitch for drainage needs less work than a compromised low-slope assembly requiring complete rebuild.
To avoid overpaying, get a written scope that specifies each line item - not a square-footage estimate that hides assumptions. Our free estimate includes exactly that: slab, framing, insulation, MEP rough, finishes, permits, and contingency, each with a dollar range. Under Haven Standard Clause 1, the final written price appears before any work begins. Call (562) 414-4842 for your estimate.
Garage Conversion ADU Near Long Beach - Our Service Area
Ellery ADU Studio serves Garage Conversion ADU in Long Beach and the surrounding corridor including Garage Conversion ADU in Lakewood, Garage Conversion ADU in Carson, Cerritos, Cypress, Compton, Norwalk, Downey, Buena Park, San Pedro, Westminster, and Torrance. Typical initial site visits schedule within one week in Long Beach proper, and within ten days for outlying cities. We know the specific zoning overlays: Long Beach’s historic districts, Lakewood’s postwar covenants, Carson’s utility coordination requirements. That local permit intelligence is part of what you receive under our single contract.
Serving Long Beach, CA - Our Local Coverage Area
We’re based in the Long Beach area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
Frequently Asked Questions - Garage Conversion ADU in Long Beach
A garage conversion ADU transforms an existing garage into a legally permitted dwelling unit with kitchen, bathroom, sleeping area, and separate entrance. In Long Beach, this is typically the fastest and most cost-effective ADU path because the structure, foundation, and roof already exist, reducing both material costs and permit review complexity compared to new construction. We evaluate whether your specific garage meets current code for habitable space and produce a permit set that addresses any gaps. Call (562) 414-4842 for a free feasibility assessment.
Most garage conversion ADUs in Long Beach reach certificate of occupancy in 8-14 months from contract signing, with permit review consuming 3-5 months of that timeline. Design and permit set production takes 6-8 weeks; construction typically runs 4-6 months depending on finish selections and inspection scheduling. Long Beach’s Planning Bureau has streamlined ADU review under state mandate, but plan-check corrections and utility coordination can extend the timeline - we manage both and report weekly. Call (562) 414-4842 for a project-specific schedule.
Garage conversion ADUs in Long Beach typically cost $65,000-$165,000 all-in depending on attached versus detached configuration, foundation condition, and utility requirements. Attached conversions with sound slabs and adequate electrical service start near $85,000; detached conversions with full utility trenching and foundation work reach the upper end. Every project receives a written price before work begins, per Haven Standard Clause 1 - no estimate ranges that evaporate at contract. Call (562) 414-4842 for your exact written quote; estimates are free.
Yes, we specify and coordinate Plant Prefab panelized systems, Tuff Shed engineered shells, and James Hardie exterior finishes within our single-contract design-build model. Plant Prefab works well for garage conversions needing extensive reframing; Tuff Shed offers a permitted replacement structure when the existing garage is beyond repair; James Hardie siding solves Long Beach’s coastal moisture challenges. We do not sell brand packages - we specify what your project requires and coordinate the factory drawings with our Long Beach permit set. Call (562) 414-4842 to discuss whether prefab integration fits your site.
We do not offer emergency construction dispatch - garage conversion ADUs are planned projects with permit timelines measured in months, not hours. However, a live person answers calls 24/7 to schedule your free estimate, discuss feasibility, or review a written estimate you already have in hand through our Free Second Opinion service. If your garage has suffered structural damage from a vehicle impact or tree fall, we can assess whether repair or accelerated conversion planning makes sense. Call (562) 414-4842 anytime.
Every garage conversion ADU carries our 365-Day Done Right Promise: if the finished unit is not built to the permitted drawings, we make it right, in writing, before the project starts. This covers workmanship, material installation, and code compliance. Beyond our promise, manufacturer warranties apply to specific products - James Hardie siding carries 30 years, for example - and we document all warranty registrations in your project closeout binder. The Haven Standard requires this documentation; we do not leave it to you to track. Call (562) 414-4842 for the full warranty terms.
Gather your property survey or plot plan, any previous permit records for the garage, and your current electrical panel photo - these accelerate our feasibility assessment. Clear the garage interior for measurement access, though we do not need it empty of all contents. Note any known issues: slab cracks, roof leaks, previous unpermitted work. We bring laser measure, moisture meter, and camera; you receive a documented photo record of our findings within 48 hours. The estimate itself is free, written, and delivered with no obligation. Call (562) 414-4842 to schedule.
Schedule Your Garage Conversion ADU Service in Long Beach Today
Call (562) 414-4842 to schedule your free estimate. A live person answers 24/7. You’ll receive a documented site assessment, a written price before any work begins per Haven Standard Clause 1, and the 365-Day Done Right Promise in writing. No “call for a quote” - we put the number on the table, then we build what’s on the page. Serving Long Beach, Lakewood, Carson, and surrounding cities since 2015.
Written by Nadia Ellery, Owner at Ellery ADU Studio, serving Long Beach since 2015.