ADU Builders
Detached ADUs designed, permitted and built, from the first look at the lot to the final inspection.
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A Benson company - serving Long Beach, CA
Benson · Long Beach, CA
ADU in Long Beach - Design, Permits and Build Under One Contract
Backyard ADUs, garage conversions and additions for homes in Long Beach and the towns around it. A free site visit and one written price.
5.0/5 rating · A local team serving Long Beach and nearby
Free Estimate on SiteCalls Answered by a Live Person, 24/7Background-Checked TechniciansA Local Team in Long Beach
Start where you are
Just looking
Browse finished ADUs and conversions and see what each kind of build involves.
Browse buildsMaking a plan
See how an ADU is designed, permitted and priced, and the promise behind the work.
How we workOur most-requested builds in Long Beach
Home Addition Contractor
Room additions built to match the house, from the footings to the roofline.
Explore home addition contractorAn ADU for every lot
Pick a build or a step to see what it covers, how it starts and one thing worth knowing before you begin.
Ways to add a unit
More room for the main house
Before the build
Detached ADUs
What it covers: A new home of its own in the backyard: foundation, framing, utilities, kitchen, bath and finishes, built to the plans the city approved.
How it starts: With a look at the lot: setbacks, access for equipment and where the utility lines can run.
Good to know: Where the sewer line can reach often decides where the ADU goes, so it is checked before the design.
Room additions
What it covers: New square footage on the main house: footings, framing, the roof tie-in, windows and finishes matched to the house.
How it starts: With drawings and the permit. Nothing is dug until the plans are approved.
Good to know: Matching the roofline and siding is what makes an addition look like it was always there.
Design & permits
What it covers: A site survey, floor plans, structural and energy calculations, and the permit set the city reviews.
How it starts: With what the household needs: a rental, a home for a parent, an office or a studio.
Good to know: Plan review can take more than one round; drawings that answer the city checklist up front save weeks.
Site prep & utilities
What it covers: Clearing, grading, trenching and new water, sewer and electrical lines run out to the new unit.
How it starts: By locating every existing line in the yard before the first trench is dug.
Good to know: An ADU often needs a larger electrical panel, so it is priced in from the start.
Getting started with Benson in Long Beach
Every project starts with a conversation and a written price. Here is how to take the first step.
Free site visit
A project lead walks the lot with you, checks what it allows and hands you a written, line-item price. No obligation.
Book a site visit
Your Long Beach team
A local crew that works across Long Beach and the towns around it, to the same written standard as every Benson location.
Areas we serve
Read our written promise
What we promise on every job, written down, with the terms spelled out before any work starts.
Our promiseSmall homes that live large
Vaulted ceilings, compact kitchens, private decks and smart storage: the details that make a small home feel bigger.
Read our ADU guides
What Our Customers Say
Homeowners around Long Beach, in their own words.
★★★★★
"Fixed quote and clear change orders approved by text."
★★★★★
"Communication was the best part. I always knew what was happening that week without having to ask."
★★★★★
"Clean, quiet crew. They respected the neighbors, kept noise to working hours, and swept the driveway every evening."
★★★★★
"Booked a consult online and met the project manager two days later. Weekly progress updates arrived by text with photos. ADU finished on schedule."
★★★★★
"Plumbing and electrical passed on the first inspection."
Frequently Asked Questions
Straight answers about how we work.
We schedule free on-site estimates within a few days of your call, and you get a written, line-item quote before anything is booked. Call (562) 362-3885 to schedule yours.
Yes. Benson ADU Long Beach is fully licensed, bonded, and insured. All technicians are background-checked and certified to perform adu work.
Absolutely. We provide upfront, transparent estimates before any work begins - no hidden fees, no surprises.
We serve Long Beach and all surrounding communities. Call us at (562) 362-3885 to confirm availability in your specific neighborhood.
Yes. All repairs and installations come with a satisfaction guarantee and a warranty on both parts and labor. We stand behind every job.
No. The written quote you sign is the price you pay. If something unexpected turns up behind a wall, we price it and get your written approval before touching it - never a surprise on the final invoice.
Guides and straight answers
Planning help from people who do this work every day.
ADU Cost Breakdown: The Long Beach Homeowner’s Reference for 2026
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ADU Warning Signs: A Long Beach Homeowner’s Reference Guide
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DIY vs Professional ADU: The Long Beach Homeowner’s Decision Guide
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Read the guideLocal Service Coverage
ADU Service Across the Long Beach Area
Part of Benson
We Are the Long Beach Team for Benson.
Benson ADU Builders is the adu company of the Relay Home Co. family. Your extra space, planned and priced in writing. Every job gets a written price before any work starts and is covered by The Relay Visibility Guarantee. Each location is independently owned and operated.
Same training, same parts, same pricing practice, and the same 365-Day Done Right Promise - delivered by people who live here.
Visit Benson →The family
Discover Relay Home Co. →Part of the Relay Home Co. Family.
Relay Home Co. is a family of home-service brands held to one written standard, and Benson is the adu company in it. One promise stands behind every trade, in every town.