Trusted New Detached ADU for Long Beach Homeowners
A Long Beach New Detached ADU typically costs $320,000-$580,000 all-in, from the first site survey through final inspection, depending on size, foundation type, and whether you choose custom stick-built or a prefab system. Most projects take 8-14 months to complete in Long Beach, with permitting through the city’s Planning and Building Bureau adding 3-5 months to the construction timeline. We’re Nadia Ellery’s team at Ellery ADU Studio, and we’ve designed, permitted, and built over 900 ADUs since 2015 - every one with a written price before any work started, per Haven Standard Clause 1.
Long Beach homeowners face a specific challenge: the city’s R-1 and R-2 zones allow detached ADUs up to 1,200 square feet, but the Coastal Zone overlay, airport influence areas around Long Beach Airport, and historic district overlays in neighborhoods like Belmont Heights and Bluff Park each add permit layers that generic contractors miss. We’ve navigated these for Long Beach clients in Alamitos Beach, Bixby Knolls, and the Craftsman Village area. Our permit sets are built for these exact conditions - not templated from Sacramento or San Diego.
Call (562) 414-4842 to schedule your free estimate. A live person answers 24/7.
What Our New Detached ADU Service Includes
Custom Built ADU
Custom built ADUs are stick-framed structures designed from foundation to finish for your specific lot, your specific needs, and Long Beach’s specific codes. You need this when your lot has unusual constraints - a narrow backyard in Belmont Shore, a significant slope in the Signal Hill-adjacent areas, or a desire for materials and layouts that prefab systems don’t offer. At Ellery ADU Studio, we produce the full permit set in-house, coordinate structural engineering for Long Beach’s seismic zone (the city sits on the Newport-Inglewood fault zone), and build through our own crews - one contract, one written price, no designer-builder finger-pointing.
Prefab ADU Installation
Prefab ADU installation brings a factory-built module to your Long Beach property, craned into place and finished on-site. This works well when speed matters and your lot is relatively flat with clear access - think the wide streets of Lakewood Village or the post-war grids near Cal State Long Beach. We specify and coordinate prefab systems from Plant Prefab, Abodu, and Tuff Shed within the same single contract that covers design, permitting, and installation. Under Haven Standard Clause 1, your written price includes crane rental, utility tie-ins, and Long Beach’s required fire department access review - not just the module itself.
Modular ADU
Modular ADUs are built to the International Residential Code in factory conditions, then transported in sections and assembled on your foundation. This differs from prefab in scale and structural method: modules are typically larger, steel-framed or heavy timber, and require a poured foundation rather than a pier system. Long Beach’s soil conditions - particularly the sandy loams near the beach and the clay-heavy soils inland toward North Long Beach - affect foundation design significantly. We assess this in our initial site survey and specify the foundation type in your written quote, with no change orders once the scope is locked at signing per Haven Standard Clause 5.
Studio ADU
Studio ADUs are detached units without a separate bedroom, typically 300-450 square feet, suited for rental income or single occupants. In Long Beach’s competitive rental market, studios in neighborhoods like Rose Park and Cambodia Town command $1,800-$2,400 monthly. We design these for efficiency: kitchenettes that meet California’s ADU kitchen requirements, Murphy beds or built-in storage, and the minimum 70 square feet of living space the city enforces. Our permit sets include Title 24 energy calculations specific to Long Beach’s climate zone (CZ12), which affects insulation and HVAC sizing.
1-Bed & 2-Bed ADU
One-bedroom and two-bedroom detached ADUs range from 450 to 1,200 square feet and function as independent rental units, family housing, or long-term home offices. Long Beach allows up to 1,200 square feet regardless of your primary home’s size, a more generous standard than some neighboring cities. We size these based on your goals: a 1-bed unit for the home rental market near Long Beach City College, a 2-bed unit for workforce housing in the Douglas Park area. Every design includes dedicated parking compliance (or the bike storage alternative Long Beach accepts), separate utility metering options, and fire separation per CBC Chapter 7A.
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 New Detached ADU
We’ve specified and coordinated Plant Prefab systems for Long Beach clients since 2019, completing units in the Los Altos and El Dorado Park neighborhoods. Their steel-frame modules handle Long Beach’s coastal corrosion conditions well, and we know their connector details well enough to catch specification conflicts before they reach the field. Abodu units we’ve installed in Bixby Knolls and along the Traffic Circle - their one-bed and two-bed models fit the 1,200-square-foot cap cleanly, and we’ve streamlined the foundation interface with their engineering team through repeated projects.
Tuff Shed structures serve a different niche: smaller studio units, home offices, and accessory structures that don’t require full ADU compliance but benefit from professional specification. We’ve adapted their PRO Studio line for Long Beach’s wind exposure zone and seismic requirements, adding insulation and mechanical systems where the base shell doesn’t include them. Whether you have Plant Prefab, Abodu, Tuff Shed, or any other make - including Cover, Dvele, Mighty Buildings, Boxabl, or James Hardie systems - we can specify, coordinate, and warrant the complete project under one contract at one written price.
Before
AfterSigns You Need New Detached ADU Right Now
- Your mortgage payment has outpaced your income growth. Long Beach home prices rose sharply between 2015 and 2022, and many homeowners in neighborhoods like Belmont Heights and California Heights are now house-rich but cash-flow constrained. A detached ADU generates rental income of $2,000-$3,500 monthly, turning your backyard into a revenue-producing asset rather than a maintenance burden.
- Your family needs flexible housing for aging parents or adult children. Multi-generational living is common in Long Beach’s Asian American and Latino communities, but privacy matters. A detached ADU provides independent living with proximity - separate kitchen, bath, and entrance - without the cost and complexity of a home addition that disrupts your existing space.
- You’re sitting on unpermitted work from a previous owner. Long Beach’s code enforcement has intensified ADU inspections since 2020, and unpermitted structures - common in post-war neighborhoods like Lakewood Village and the Eastside - can block refinancing, insurance claims, or sale. A permitted new detached ADU replaces the liability with a documented, warranted asset.
- Your garage is structurally compromised or poorly positioned. Not every garage converts well. We’ve seen Long Beach garages with slab settlement from the 1933 Long Beach earthquake, inadequate ceiling height for habitable space, or location that blocks backyard access. When the garage won’t convert economically, a new detached ADU is the better path.
- You’re planning to sell within 5-10 years and need to maximize appraised value. Appraisers in Long Beach increasingly credit permitted ADUs at full value, not just as outbuildings. A detached ADU with its own address and utility meter adds square footage that counts - unlike garage conversions that share the primary home’s systems and often get discounted.
Our New Detached ADU Process - Step by Step
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Site Survey & Zoning Verification. We visit your Long Beach property, measure setbacks from all property lines, photograph existing conditions, and pull your parcel’s zoning history from the city’s GIS system. We verify whether you’re in the Coastal Zone, an airport influence area, or a historic overlay - each triggers different permit paths. You receive a documented photo record of what we found, not a summary of how it felt.
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Conceptual Design & Written Price. Within two weeks of survey, we deliver a conceptual floor plan, 3D massing model, and written line-item quote. Under Haven Standard Clause 1, this price is fixed before any work begins. It includes all design hours, permit fees (based on Long Beach’s current fee schedule), construction labor and materials, and our 365-Day Done Right Promise. No “call for a quote” - the number is on the page.
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Permit Set Production & Submission. Our architects produce the full construction document set: site plan, floor plans, elevations, sections, structural calculations for Long Beach’s seismic design category, Title 24 energy compliance, and green building checklist. We submit to Long Beach’s Planning Bureau for zoning clearance, then to Building & Safety for plan check. Typical plan check time is 4-6 weeks; we track it weekly and respond to corrections within 48 hours.
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Construction & Inspection. Our background-checked, uniformed crews build from the permit set - not field decisions. We document every visit with dated photographs you receive through our client portal. Foundation, framing, insulation, and final inspections are scheduled and passed before we proceed. Long Beach’s inspectors know our work; we’ve passed over 900 inspections here since 2015.
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Final Walkthrough & Warranty Activation. After certificate of occupancy, we conduct a punch walk with you, using the permit drawings as the standard. Any deviation is corrected under the 365-Day Done Right Promise, backed in writing before your project started. You receive the final photo record, warranty documentation, and a letter confirming permit finalization for your records.
How Much Does New Detached ADU Cost in Long Beach?
A typical custom built new detached ADU cost guide in Long Beach runs $320,000-$480,000 all-in for a 500-750 square foot unit, and $420,000-$580,000 for 800-1,200 square feet. Prefab and modular systems typically land 10-20% lower on construction cost but carry similar all-in totals once foundation, utility tie-ins, and Long Beach’s permit fees are included. Studio ADUs start around $280,000-$350,000 when site conditions are straightforward.
Several factors move these ranges. Foundation type is significant: a standard spread footing on level ground costs less than a raised foundation on Long Beach’s hillside lots near Signal Hill or a pier system required in flood-prone areas near the Los Angeles River channel. Utility distance matters - extending sewer and water lines 80 feet across a backyard is different from tapping in 15 feet from the alley. Interior finishes range from durable rental-grade materials to custom cabinetry and flooring; we specify the level in your written quote so there’s no ambiguity.
Permit fees in Long Beach include plan check, building permit, plumbing and electrical permits, and often parkland dedication fees or school fees depending on unit size. We itemize these in your quote based on the city’s current fee schedule, not estimates that shift later. To avoid overpaying, we offer a Free Second Opinion on any written estimate you already have - we’ll identify what’s missing, what’s inflated, and where the scope gaps are.
Every free estimate includes the site survey, zoning verification, conceptual design, and written line-item pricing. Call (562) 414-4842 to schedule yours.
New Detached ADU Near Long Beach - Our Service Area
We design, permit, and build new detached ADUs throughout Long Beach and the surrounding cities: New Detached ADU in Lakewood, New Detached ADU in Carson, Cerritos, Cypress, Compton, Norwalk, Downey, Buena Park, San Pedro, Westminster, and Torrance. Response times for initial site surveys are typically 3-5 business days in Long Beach proper, and 5-7 days in outlying areas. We’ve worked in the specific soil conditions, permit offices, and inspection protocols of each city - Long Beach’s Planning Bureau operates differently than Lakewood’s Community Development Department, and we adjust our permit sets accordingly rather than submitting templated documents.
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 - New Detached ADU in Long Beach
New Detached ADU - San Pedro is a separate, freestanding residential unit built on the same lot as an existing single-family or multi-family home, with its own foundation, walls, roof, kitchen, bathroom, and entrance. In Long Beach, detached ADUs can reach 1,200 square feet in R-1 zones and must meet setback, height, and parking requirements specific to your parcel. Ellery ADU Studio handles the full process - design, permitting, and construction - under one contract with one written price.
Most new detached ADUs in Long Beach take 8-14 months from contract signing to certificate of occupancy, with permitting accounting for 3-5 months and construction for 5-9 months. Coastal Zone properties or those requiring variance relief add 2-4 months. We track permit status weekly and communicate delays transparently - no surprises, per Haven Standard Clause 5. Call (562) 414-4842 for a timeline estimate based on your specific address.
Our New Detached ADU in Carson typically costs $280,000-$580,000 all-in, depending on size, foundation complexity, and finish level. A 400-square-foot studio on a simple slab might land at the lower end; a 1,200-square-foot two-bedroom with custom finishes and a raised foundation reaches the upper range. Every project receives a written, line-item quote before any work starts - no “call for pricing,” no hidden costs. Call (562) 414-4842 for your exact estimate; estimates are free.
Yes. We specify and coordinate Abodu, Plant Prefab, and Tuff Shed systems - plus Cover, Dvele, Mighty Buildings, Boxabl, and James Hardie - within our single-contract design-build model. Our expertise includes foundation interface design, crane logistics for Long Beach’s street access constraints, and warranty coordination with the manufacturer. Whether you have a brand preference or want us to recommend based on your site, we integrate the system into one written price and one accountable team.
New detached ADU construction is planned work, not an emergency service - we do not promise same-day dispatch or artificial urgency for projects that require months of design and permitting. What we do promise is predictable scheduling: your project enters our queue at contract signing, with milestone dates committed in writing. If you’re facing a hard deadline - loan expiration, family arrival, lease end - we build the schedule backward from that date and tell you honestly whether it’s achievable. A live person answers (562) 414-4842 24/7 to discuss your timeline.
Every new detached ADU is covered by our 365-Day Done Right Promise: if the finished unit is not built to the permitted drawings, we make it right - in writing, before your project starts, backed by Haven Standard documentation. This covers structural, mechanical, electrical, and plumbing systems. Beyond our promise, manufacturer warranties apply to prefab and modular systems we specify. We deliver all warranty documents at final walkthrough, not upon request months later.
Gather your property’s legal description or APN (available on your tax bill), any existing survey or plot plan, and a rough idea of your budget range and intended use - rental, family housing, or home office. If you have a written estimate from another provider, bring it for our Free Second Opinion service. We’ll handle the zoning research, site measurement, and design concepts. Call (562) 414-4842 to schedule; a live person answers 24/7.
Schedule Your New Detached ADU Service in Long Beach Today
Call (562) 414-4842 to schedule your free estimate. Nadia Ellery’s team at Ellery ADU Studio will survey your Long Beach property, verify your zoning, and deliver a written, line-item price before any work begins - guaranteed by Haven Standard Clause 1. A live person answers 24/7. No obligation, no voicemail queue, no callback that doesn’t materialize.
Written by Nadia Ellery, Owner at Ellery ADU Studio, serving Long Beach since 2015.