







A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateFast, Reliable Room Addition Contractor Across Maywood
A room addition in Maywood, CA typically costs $140,000 – $260,000 for a 400 – 600 square foot ground-floor build, depending on foundation work, finish level, and whether older unpermitted work needs to be legalized first. Most projects take 5 – 8 months from signed contract to final inspection. Call (472) 248-8213 for a written, line-item estimate before any work begins.
We know Maywood’s lots. At 1.2 square miles with nearly every parcel built out, your addition will likely tuck against a rear block wall or run along a side setback. There’s no alley to stage from, and most homes front directly onto the street. That changes how we plan material deliveries, where the dumpster sits, and how the inspector accesses the site. Our Room Addition Contractor team plans for that from the first walkthrough, not the third.
Why Sutton ADU Builders Is Maywood’s Preferred Room Addition Contractor Company

Homeowners in Maywood call us because they want to know who is walking through their front door. Every Sutton technician is background-checked, identity-verified, and photo-badged under the Threshold Standard. We send you the name and photo of every crew member before they arrive. No unfamiliar faces, no guessing. Miles Hartwell, our owner, set that rule in 2006 and it has not changed.
We also give you a written price before work starts. Not a ballpark, not a verbal range, not a “we’ll see how it goes.” A line-item written quote. If the scope changes, you approve the change in writing first. The 365-Day Done Right Promise covers defects in workmanship for one full calendar year from project completion. If something is not right, we come back and make it right, free.
And when you call with a question about your Maywood addition, a live person answers. Day or night. No phone tree, no callback queue. You get a human who can look up your project.
Modular Home Addition in Maywood
A modular home addition in Maywood usually makes the most sense when your lot has no rear access for a boom truck, which is nearly every lot in this city. Because Maywood parcels front directly onto the street with block walls at the property line, panelized and prefab systems let us frame faster with hand-carried components instead of waiting for crane access that is never coming. A modular addition here typically runs $160 – $280 per square foot depending on the system and finish package.
Prefab wall panels and factory-cut framing
We use factory-measured wall panels and pre-cut framing packages from brands like Plant Prefab and Boxabl on tight Maywood lots. The panels arrive cut to spec and get carried through the house or over the front curb. There is no back alley for a delivery truck or a telehandler. Off-site cutting also means less sawdust and fewer trips in and out of your home, which matters when the staging area is your front yard or living room floor.
When a panelized addition beats stick framing in Maywood
If your rear setback is under five feet and the block wall abuts your property line, a panelized system keeps the build moving. We are not sawing rafters in a 4-foot rear yard for six weeks. Panels go up in days, giving the inspector a clean line of sight to framing, shear wall, and hold-downs. That speed on the structural phase shortens the time your back wall is open to the weather.
Home Addition Plans in Maywood

Home addition plans in Maywood start with a survey of what actually exists on your lot, not what the assessor’s record says. Because so many Maywood homes have unpermitted additions from the 1960s through the 1980s, we pull the permit history and measure the existing footprint before drawing anything. Plan sets for a typical Maywood room addition run $4,000 – $9,000 including structural engineering, Title 24 energy calculations, and site plan.
Survey, setbacks, and the Maywood municipal plan check
Your plan set has to clear Maywood’s own plan check, then Los Angeles County Building & Safety, plus a fire department review. The city’s plan check catches local zoning details: rear and side setbacks, lot coverage limits, and height restrictions. Miss the municipal step and the county will bounce it back, adding weeks. We schedule all three reviews up front and build that time into the calendar honestly.
Drawing a plan for a lot with no backyard
Many Maywood additions extend off the back of the house toward a block wall 10 feet away, or push out to the side lot line. The plans have to show how we maintain the required setback, where the new foundation ties into the existing, and how mechanical runs get through a 1940s stucco wall with a galvanized gas line nobody documented. Good plans answer those questions before demo day. We have drawn enough of these to know where the surprises usually hide.
Why We’re Different From Other Room Addition Contractors in Maywood
Every contractor says they do good work. Few of them will put a name, a photo, and a written price in front of you before they swing a hammer. We send you a badged, background-checked crew list before day one. We hand you a line-item written price before the first tool is lifted. And we put the 365-Day Done Right Promise in writing on every Maywood project, covering our workmanship for a full calendar year. That is the Threshold Standard. It is a system, not a slogan.
Trusted Brands We Service in Maywood
We work regularly with Dvele, Cover, Mighty Buildings, and Boxabl systems on Maywood room additions, along with James Hardie exterior cladding products. If you are weighing a prefab or panelized build, we will give you straight guidance on which brand fits your lot, your setback, and your budget instead of pushing the one we happen to stock. We coordinate the design, permitting, and site prep so the system you choose actually gets installed on schedule.
Common Room Addition Contractor Problems We See in Maywood Homes
- Unpermitted additions from decades ago. A lot of Maywood homes were expanded in the 1960s through the 1980s without permits. Before a new addition can tie into the existing roofline, foundation, or electrical panel, that older work often has to be legalized through the county or removed. We pull the permit history early so this does not surface as a stop-work order at the rough inspection.
- No rear access for staging. Nearly every Maywood lot fronts onto the street with a block wall at the back and no alley. Material deliveries, dumpster placement, and crew entry all happen from the front curb. A plan that assumes a 10-foot rear working setback will stall on day one.
- Tight lot coverage limits. Maywood is 1.2 square miles and fully built out. The city and county both enforce strict lot coverage maximums, so a 500-square-foot rear addition can bump you over the allowed footprint. We check that against the actual surveyed lot before you pay for plans.
- Older galvanized plumbing and gas lines in exterior walls. Many 1940s and 1950s Maywood homes have gas lines and water supply lines running through what looks like an empty exterior wall cavity. We scan before we cut so a surprise gas line does not turn into a red tag and an emergency plumber at double rate.
Pricing for Room Addition Contractor in Maywood, CA
Here are honest ranges for Maywood’s market. A ground-floor primary suite addition of 400 – 600 square feet runs $140,000 – $260,000. A modular or panelized addition lands in a similar band, typically $160 – $280 per square foot. Plan sets run $4,000 – $9,000. Permit fees for Maywood and LA County combined usually fall between $6,000 and $15,000 depending on project valuation. Foundation and site work on a tight lot can add $15,000 – $35,000 if we are digging near a block wall, rerouting utilities, or legalizing old footings. Every estimate is a written line-item price before work starts. Call (472) 248-8213 and we will walk your lot and give you real numbers.
We Also Serve Cities Near Maywood
Our crews work throughout southeast LA County. If you are in Maywood, Bell, Huntington Park, Bell Gardens, or South Gate, we can schedule a site walk and written estimate. The lot patterns and building codes are similar across these cities, so the plan-check process does not surprise us. We route crews through the area weekly.
Serving Maywood, CA - Our Local Coverage Area
We’re based in the Maywood area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs About Room Addition Contractor in Maywood

You need both. Maywood runs its own plan check for zoning, setbacks, lot coverage, and height limits. Los Angeles County Building & Safety handles structural, electrical, plumbing, and mechanical reviews, plus the fire department sign-off. We submit to the city first, then the county. Missing the municipal step adds weeks and gets the county file bounced back. Call (472) 248-8213 and we will map the full permit path for your specific lot.
Usually because your lot has conditions their lot does not. Your addition may require legalizing old unpermitted work, shoring up a failing foundation, rerouting a gas line found in an exterior wall, or working in a side setback with no staging room. Their lot may have a wider rear yard, newer plumbing, or a clean permit history. Square footage is the headline, but access, existing conditions, and foundation depth drive Maywood pricing more than raw size. Call
Yes, in many cases you can keep the detached garage and build a room addition beside it, provided the combined structure stays within the city’s lot coverage and setback requirements. We would survey the garage foundation, check whether it was permitted, and confirm the added room’s roofline can be tied in without overbuilding the garage walls. Some Maywood garages from the 1940s and 1950s have unreinforced block walls that cannot support a new adjacent load without additional footings. Call
Three things, and we put each one in writing before doing the work. One: discovering unpermitted prior work that has to be legalized or removed. Two: the city or county plan checker requiring a design change that increases material or labor cost after permit submittal. Three: you choose to upgrade finishes, fixtures, or systems mid-build. None of those become a surprise invoice. We quote the change in writing, you approve it, then we proceed. Our written price before work starts covers everything we can see and measure; the change order process covers what we could not see until the wall was open. Call (472) 248-8213 and we will walk you through a sample change order so you know exactly what to expect.
Most Maywood room additions take 5 – 8 months from signed contract to final inspection. Design and plan sets take 4 – 8 weeks. Maywood plan check plus LA County Building & Safety and fire review typically runs 8 – 14 weeks depending on reviewer backlog and whether the design gets corrections. Construction for a 400 – 600 square foot addition on a tight lot runs 10 – 16 weeks, with foundation, framing, mechanicals, drywall, and finishes each taking 1 – 3 weeks. We build the calendar off the actual Maywood and county review timeline, not the county schedule alone. Call (472) 248-8213 for a realistic schedule for your project.
Contact Our Room Addition Contractor Team in Maywood
If you are planning a room addition in Maywood, start with a free site walk and a written, line-item estimate. Call (472) 248-8213 or send us a message and we will come out to your lot, pull your permit history, and give you real numbers. No vague ranges, no surprise invoices. You will know exactly who is coming to your property before the first day of work, because we send you their name and photo. That is how we have done it since 2006, and that is how we do it in Maywood.
Written by Miles Hartwell, Owner at Sutton ADU Builders, serving Maywood since 2006.
Why Maywood Chooses Sutton ADU Builders
We set the standard for room addition contractor in Maywood.
No Change-Order Surprises
The written quote you sign is the price you pay. Anything we find mid-job gets priced and approved by you in writing before we touch it.
Licensed & Insured
Fully certified technicians who meet all local and state licensing requirements.
Upfront Pricing
No hidden fees, no surprises. You approve the price before any work begins.
Guaranteed Work
Every repair and installation is backed by our workmanship warranty and satisfaction guarantee.
How It Works in Maywood
Getting your room addition contractor handled is simple and fast.
Call or Request a Free Estimate
Tell us about your room addition contractor needs and we provide an upfront, transparent quote - no obligation, no hidden fees.
Licensed Technician Dispatched
A background-checked, certified technician arrives in Maywood - typically within 30-60 minutes, with parts stocked on the truck.
Problem Solved, Guaranteed
We complete the job to your full satisfaction, backed by our warranty and 100% satisfaction guarantee.
What happens when you call
- 1A real person answersNo phone trees - talk to a local room addition contractor pro.
- 2You get an upfront price rangeHonest numbers before anyone is dispatched. No surprises.
- 3We come out and measureLicensed & insured, at a time that suits you - the visit and the quote are both free.
- 4You get the price in writingLine-itemed, yours to keep, and nothing starts until you say go.
What Maywood Customers Say
Trusted by homeowners across Maywood and surrounding areas.
"Itemized estimate with allowances laid out. Final cost was within a hair of the quote."
"Backyard ADU for my mother. The project manager showed ID and walked me through the permit steps, the foundation plan, and the schedule. Moved her in on time."
"Insulated the walls and ceiling properly. It stays comfortable even in July."
Our Work in Maywood
A look at recent adu projects across Maywood and surrounding areas.
More ADU services in Maywood
Every build below starts the same way: a free site visit and a written price.
Home Addition Contractor
Room additions built to match the house, engineered, permitted and inspected.
Explore home addition contractorADU Builders
Detached ADUs designed, permitted and built, from the first survey to the final inspection.
Explore adu buildersGetting started with Sutton
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
Find your local team
Each location is independently owned and works to the same written standard. Enter your ZIP code to reach yours.

Read our written promise
What we promise on every job, written down, with the terms spelled out before any work starts.
Our promiseCurrent Offers
Bring these savings to your next appointment.
Free On-Site Estimate & Written Quote
No obligation. We measure, price the job in writing, and the quote is yours to keep.
Written Price Before Any Work Starts
Written Guarantee on Every Repair
Free Second Visit if the Repair Fails
Ready for Room Addition Contractor in Maywood?
Call now for a free estimate - or request one below. Licensed, insured, and here with fast after-hours help in Maywood.
(472) 248-8213Request a Free Estimate in Maywood
Tell us about your room addition contractor needs - we'll respond within the hour.