Home Additions & ADU in Maywood - One Fixed Price, Permits Handled

Fast, Reliable Home Additions & ADU Across Maywood

Home additions and ADU construction in Maywood typically run $45,000 to $130,000 for room additions and $90,000 to $220,000 for a new detached ADU, with most projects clearing the LA County permit process in two to four months before framing begins. If you live in Maywood’s 90270 ZIP, you already know the challenge: lots are tight, neighbors are close, and everything runs through LA County Building and Safety instead of a local counter. We’ve built additions and ADUs on these streets long enough to know exactly how that works. Call (877) 610-1318 for a free estimate and we’ll walk you through what your specific lot can support.

Call (877) 610-1318

Key Takeaways:

• Room additions in Maywood typically cost $45,000-$130,000; detached ADUs run $90,000-$220,000.
• All Maywood projects route through LA County Building and Safety, not a city office - we handle the full submittal and inspection schedule.
• Maywood’s lot sizes and setbacks demand careful foundation, drainage, and fire-rating work - we pull every permit and sign every inspection.
• Tom Barrett puts his name on the truck and the contract. Founded 1998, owner-operated, with a written 90-Day Done Right Promise on every job.
• Free estimates, written change orders, and a live person answering the phone at (877) 610-1318.

Why Maywood’s Density Changes How You Build

Here’s what you need to know before you even sketch a footprint: Maywood packs roughly 26,000 people into 1.18 square miles. That is not a planning footnote. It means your addition will likely sit within feet of a neighboring wall, your material staging happens in the street or not at all, and your excavation crew will be hand-digging utilities rather than swinging a machine through a side yard that doesn’t exist. We’ve framed second-story additions on lots where the only access for lumber was through the front door. We plan for that from the first site walk, not the first day of framing.

The other Maywood-specific reality: since the 2010 fiscal crisis, the city contracts permitting and inspections to Los Angeles County. Anyone telling you they can rush a Maywood permit through a local counter is misinformed. We submit plans to LA County Building and Safety, schedule their inspectors, and build the inspection calendar into your project timeline from day one. Our Home Additions & ADU team has been through that process enough times to know which details trigger plan-check redlines and which take an extra two weeks. That experience is worth real money on a Maywood lot.

Why Barrett & Sons Construction Is Maywood’s Preferred Home Additions & ADU Company

Tom Barrett started this company in 1998, and his sons run the crews. When we say owner-operated, we mean the person quoting your job is the person you’ll see on site, and the name on the contract is the name on the truck. Maywood homeowners have been burned by national outfits that quote one number on the phone and send a different invoice after the work wraps. We do the opposite: every scope change arrives as a written change order before anything happens. An allowance that isn’t on paper is a surprise waiting for a date, and we don’t do surprises.

Our crew members are background-checked and uniformed on every visit. Maywood jobs are coordinated from our Los Angeles office, so scheduling an estimate or a walkthrough is a phone call, not a three-week wait. And after the job is done, the 90-Day Done Right Promise is written into the contract: if something isn’t right, one call brings Tom back. No fine print, no follow-up phone tree.

Our Home Additions & ADU Services in Maywood

Maywood’s housing stock is mostly small postwar bungalows and two-to-four-unit apartment buildings from the 1940s through the 1960s. That means the first question is rarely “how big” - it’s “what can this lot and this foundation actually carry.” Here are the four services we handle most often for Maywood homeowners:

ADU Design & Permitting

An ADU in Maywood starts with a real question: does your lot have enough buildable space under current zoning, and what will LA County require for fire rating, setbacks, and utilities? We prepare the plans, submit to LA County Building and Safety, and carry the project through every inspection. A typical detached ADU in Maywood runs $90,000 to $220,000 depending on size, foundation, and utility work. The permitting phase is where Maywood’s county-routed process costs you time if it’s handled wrong, so we treat it as its own job, not an afterthought.

Garage Conversion ADU

Most Maywood garages were built for one car and a workbench, not for living. Converting one to an ADU means addressing the slab, the roof framing, the single-wall electrical panel, and often asbestos in old drywall and flooring. A garage conversion in Maywood typically runs $30,000 to $80,000. Because the structure already exists, this is often the fastest path to a rentable unit or an in-law suite - but only if the numbers on paper match what’s actually in the garage. We start with the site walk, not the brochure.

New Detached ADU

On Maywood lots with depth but no width, a detached ADU tucked behind the main house is often the most buildable option. These run $90,000 to $220,000 and require full foundation work, separate utility runs, and careful drainage grading. Maywood’s alluvial soil and liquefaction potential mean we evaluate the foundation engineering early, not after a crack shows up. If you’re weighing an ADU against a room addition, our Kitchen Remodeling in Maywood team can also walk you through whether expanding the footprint of your existing house makes more sense than building out back.

Junior ADU & Interior Conversion

A junior ADU carved out of existing square footage - say, a converted rear bedroom with its own entry - is the least expensive ADU route on a Maywood lot. These typically fall on the lower end of the $30,000 to $80,000 conversion range, but they require careful planning for egress windows, separate metering, and sound separation. In homes where we’re already reworking the interior, pairing a JADU with a Bathroom Remodeling in Maywood can make the space feel like a true separate unit, not a bedroom with a mini-fridge.

Room Additions

A ground-floor room addition in Maywood runs $45,000 to $130,000 depending on whether we’re adding a bedroom, extending the kitchen, or building out a family room with a new foundation. Because most houses sit on 25-to-40-foot-wide lots, the addition usually extends toward the back, not the side. That means relocating the rear property line, rerouting drainage, and sometimes pulling gas or sewer lines that run right where the new slab wants to go. We handle all of it with permits pulled and inspections signed.

Second Story Additions

When the lot has no room to grow outward, we go up. Maywood’s older bungalows often need structural evaluation before a second-story addition - the original foundation may have been poured for a single-story load. We review the existing framing, upgrade what needs upgrading, and work with an engineer on seismic requirements that matter more here than in cities with newer housing stock. Second-story additions in Maywood typically fall between $45,000 and $130,000 depending on scope.

Sunrooms & Enclosed Patios

On Maywood’s tight lots, an enclosed patio or sunroom can add usable square footage without triggering the full weight of a traditional addition permit. These projects run on the lower end of the $45,000 to $130,000 room-addition range depending on glazing, foundation, and whether the space needs climate control. If you’re not ready for a full addition, this is often a smarter first step - and we’ll tell you if it isn’t.

Trusted Brands We Service in Maywood

We install windows and doors from Simonton, Ply Gem, and PGT on our Maywood projects. These are brands you can look up, read the warranty on, and verify the performance ratings for - not mystery products off the back of a van. PGT and Simonton both build impact-rated lines that matter on larger additions where new glazing has to meet current energy and safety codes. If a window or door in your new addition ever needs service, parts are available quickly through our regular supply channels, so you’re not waiting on a special order from the other side of the country.

Common Home Additions & ADU Problems We See in Maywood Homes

• Foundation assessment and retrofit on older slabs. Maywood’s soil has liquefaction potential during a seismic event, and many postwar bungalows sit on foundations that were never engineered for today’s load or movement standards. We inspect and, where needed, retrofit before framing starts.
• Asbestos and lead paint in pre-1980 construction. Drywall, floor tile, duct wrap, and old paint in Maywood homes routinely contain regulated materials. Abatement coordination has to happen before demolition, and we schedule it so the project doesn’t stall mid-framing.
• Drainage grading with almost no permeable surface. Maywood is flat and heavily paved, so rain events concentrate water fast. An addition needs positive drainage away from the structure, and we engineer the grade instead of hoping the sidewalk absorbs it.
• Zero room for equipment staging. With lots this small, material delivery and debris removal happen in the street or in a neighbor’s agreed access. We coordinate that in writing at the start so the job doesn’t turn into a parking dispute halfway through.

Pricing for Home Additions & ADU in Maywood, CA

We Also Serve Cities Near Maywood

We run Home Additions & ADU projects throughout the surrounding area, including Maywood and the neighboring cities of Bell, Cudahy, Commerce, and Huntington Park. If you’re a few blocks outside the city line, call us anyway. The LA County permit process doesn’t stop at the border, and neither do our crews.

FAQs - Home Additions & ADU in Maywood