Room Additions in Norwalk, CA
Free Estimates
By phone, or in person
Permits Handled
Pulled by us, inspections passed
Since 1953
Family trades, same owner as One Hour Plumbing
Residential & Commercial
Homes, ADUs, buildouts
Discounts
Cash, senior & military
More house, same address. We build room additions, primary suites, and second stories — foundation to final inspection, one contractor the whole way.
Sound familiar?
Call about this if…
- The family outgrew the house but not the neighborhood
- You need a primary suite and there's nowhere to put it
- A second story makes more sense than moving on a small lot
- An old addition was done without permits and needs to be fixed
- You've priced a move and the addition wins
An addition opens up your roof, your walls, and your foundation. That's exactly the project where a disappearing crew or a low-bid change-order artist hurts most. You get a fixed scope, a written schedule, and a job site that gets buttoned up weathertight — not a tarp flapping over your living room for a month.
Scope
What's included
- Single-room additions and bump-outs
- Primary bedroom and bathroom suites
- Second-story additions
- Family rooms and great rooms
- Structural engineering and city permits
- Foundation and slab work
- Framing, roofing, and exterior matching (stucco, siding)
- Electrical, plumbing, and HVAC extension into the new space
- Drywall, flooring, paint — finished, not 'framed and gone'
- Final inspection and sign-off
Process & permits
How Mickey handles it
Call and describe the room and where it goes. You get a per-square-foot range on the phone.
Site visit: Mickey checks the foundation, roofline, and setbacks, then gives you a firm number.
Structural plans, engineering, and city permits, handled by us.
The shell goes up weathertight before the wall into your living space opens.
Finishes, final inspection, and a walkthrough with you before the last payment.
Additions need structural plans and a city permit — we handle engineering, plan check, and every inspection along the way.
We match the existing roofline, stucco, and trim so the addition looks original, not bolted on.
The house stays livable. We seal off the work zone, keep utilities running, and schedule the tie-in so you're never without a kitchen or bathroom longer than we told you.
Pricing
Straight prices, no bait
Free estimates, by phone or in person. No lowball bid that doubles through change orders. The number in the contract is the number we build to, and nothing changes without your signature and a price first. Cash, senior, and military discounts.
From the owner of One Hour Plumbing Service, a name built in southeast LA County on straight quotes and no upselling since 1953.
People also call about
Additions across LA County & Orange County
Based in Norwalk. Same crew, same prices, in every city below. Don't see yours? Call and ask.
Los Angeles County
Straight Answers
Common questions
How much does a room addition cost in Los Angeles?
Most single-room additions run $300–$500 per square foot depending on what's in the room — a bedroom costs less than a bathroom or kitchen. Second stories run higher. Call and we'll give you a straight range for free.
Do room additions need permits?
Yes, every time. Structure, electrical, plumbing, and mechanical all get inspected. Unpermitted additions come back to bite you at sale time — appraisers won't count the square footage and buyers' lenders walk.
How long does an addition take?
A typical single-room addition runs 2–4 months of construction after permits. Second stories run longer. You get the schedule in writing before we start.
Can we live in the house during construction?
Almost always, yes. We build the shell weathertight before opening the wall into your living space, and we keep the work zone sealed off from the rest of the house.
Ready to build? Call or text now.
Mon–Sat 7am–6pm · Free estimates · Cash, senior & military discounts