Attached ADU
Attached ADU BuilderIn Cerritos, CA
NewGen ADU Builders is an attached ADU builder in Cerritos, adding a unit that shares a wall with your home across Los Angeles and Orange County, backed by a 1-year workmanship warranty.
01 — What's Included
What's Included in an Attached ADU
An attached ADU is a new unit built onto the side or rear of your existing home, connected by a shared wall but functioning as a separate residence. It suits lots without room for a detached structure, families who want parents or adult children close but independent, and owners who want to add a rental without losing yard.
Site visit and connection-point planning
Floor plan and exterior design matched to the main home
Foundation, framing, and roof tie-in
Full kitchen and bathroom build-out
Plumbing, electrical, and HVAC coordination
Sound and privacy separation at the shared wall
Final walkthrough and 1-year workmanship warranty
02 — Process
How Our Attached ADU Process Works
- 01
Consult
Text, call, or send the form for your free ADU property and investment analysis. We review where the unit can connect, the roofline and exterior tie-in, and utility runs, then talk through your goals, budget, and preliminary feasibility.
- 02
Design
We develop the concept — size, layout, and finish level — for your attached ADU and coordinate architectural and engineering work based on the final scope, then deliver a written estimate you approve before we move to permitting.
- 03
Permit
We submit for plan check and coordinate every permit requirement with the applicable jurisdiction so your project is fully approved before construction starts.
- 04
Build
From the foundation tie-in and framing through MEP and finishes, we manage the defined scope, selections, and schedule, with inspections at every stage. We keep disruption to your household as low as possible; timelines fall within our 3 to 6 month range.
- 05
Turnover
Final inspection, punch-list completion, and a complete handoff of your finished attached ADU, backed by our 1-year workmanship warranty.
03 — Why Choose Us
Why Choose Us for anAttached ADU
Two Homes, One Structure
An attached unit has to feel separate even though it shares a wall. We plan the entrance, sound separation, and layout so both households keep their privacy.
Built to Match Your Home
We design the addition so the roofline, siding, and finishes read as part of the original house, not an afterthought. Design-forward is part of how we work.
Honest, Transparent Pricing
Attached ADUs often cost less than detached units because they share a wall and foundation edge. We show you where your project lands within our $120,000 to $340,000 range before you commit.
Licensed, Insured & Bonded
Tying into an existing home carries structural risk. Our licensing, insurance, and bonding protect your property throughout.
1-Year Workmanship Warranty
If anything we built needs attention in the first year, we come back and fix it.
04 — Get Started
Ready to Add an Attached ADUto Your Home?
Reach out and we will schedule a short intake call, then visit your property to walk the connection point with you and provide a clear written estimate.
- Free estimates after an on-site visit
- Licensed, insured and bonded
- 1-year workmanship warranty
- Text us at (562) 308-6040
05 — FAQ
Common Questions AboutAttached ADUs
How much does an attached ADU cost?
Our ADU projects run between $120,000 and $340,000. Attached units often fall below a comparable detached unit because they share a wall and use part of the existing structure. Your written estimate will show exactly where your project falls.
Will construction disrupt my household?
Some disruption is unavoidable when we tie into an existing home, but we plan the sequence to keep it as low as possible and tell you what to expect before each phase. Builds run 3 to 6 months.
Can the attached ADU have its own entrance?
Yes. Every attached ADU we build has a separate entrance, kitchen, and bathroom so it works as an independent home for family or a tenant.
Attached or detached: which is better?
Attached units suit smaller lots and often cost less. Detached units offer more privacy and flexibility. We help you decide at the on-site visit based on your lot, budget, and goals.
What areas do you serve?
We build within about 30 miles of Cerritos across Los Angeles County and Orange County.
What should I compare when I'm getting bids from other ADU builders?
Before you compare bids, compare scope. Ask every builder to spell out, in writing, who is responsible for design and engineering, utility and electrical-service work, and foundation and structural scope; what cabinet, counter, flooring, and tile allowances are included; who handles permit and inspection responsibilities and site concrete, drainage, and exterior work; what the change-order process and exclusions are; and what your completion, punch-list, and warranty responsibilities look like. We put all of it in writing before you sign.
06 — Service Area
Attached ADUs in Cerritosand Beyond
We build attached ADUs for homeowners and investors throughout Los Angeles County and Orange County, within roughly 30 miles of our Cerritos base. Not sure you are in range? Text us and we will confirm.
Cerritos, CA
Norwalk
Lakewood
Bellflower
Buena Park
Downey
Whittier
Fullerton
Long Beach
Garden Grove
Offering attached ADU construction in Cerritos, Los Angeles County, and Orange County. Get your free estimate today.