A free site visit, a check of what your lot allows and a written, line-item price.
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A home addition adds square footage to your existing house, whether that means a new bedroom wing, a sunroom, a second story, or a garage conversion. Done right, it’s how you get more space without moving, and it almost always costs less per square foot than buying a bigger home. Benson ADU Builders has been building additions and ADUs under the Relay Home Co. family since 2006, and we work as our Home Addition Contractor in Los Angeles team, and we handle everything from foundation to finish with one written price and a 365-Day Done Right Promise. Troy Eastman leads our team with a simple rule: if the price changes at the door, the deal changes, and that doesn’t happen here. Call (903) 568-7222 to talk through your project with a real person, any hour of any day.
What separates us from a typical home addition contractor is the paper trail. You get a written price before work starts, background-checked uniformed technicians on site, and a live person on the phone 24/7. No voicemail loops, no vague “we’ll get you a number by Friday.” We build with leading prefab brands like Dvele, Mighty Buildings, and Plant Prefab, then explain every trade term in plain English so you always know what you’re paying for and why.
Sunroom Addition
A Sunroom Addition extends your living space with walls of glass and a roof that ties into your existing structure, giving you a bright room that works as a morning coffee spot, a reading nook, or a plant room. You’d consider one when you want extra square footage without a full foundation pour, and the project typically runs $25,000 to $80,000 depending on size, glazing quality, and whether you want heating and cooling extended into the space. Benson ADU Builders designs and builds sunrooms as true conditioned additions, not flimsy porch enclosures that bake in summer and freeze in winter.
Foundation and Framing Choices
Sunrooms can sit on a slab-on-grade foundation or a traditional crawlspace, and the choice changes both cost and comfort. We’ll walk you through the tradeoffs, then put the recommended approach in writing with the full price attached.
Glass Packages and Climate Control
The glass you pick drives most of the cost difference in a sunroom. Dual-pane low-E glazing costs more up front but pays back in lower utility bills and a room you can actually use in August. We specify James Hardie cladding on the exterior walls so the addition matches your house and holds up for decades.
Second Story Addition Contractor
A Home Addition Contractor in Huntington Park builds upward instead of outward, adding a full or partial floor on top of your existing home. This is the route when your lot is small, your setback lines leave no room to expand sideways, or you want to preserve yard space. Expect to pay $100 to $300 per square foot for a second story addition, which puts a typical 800-square-foot project between $80,000 and $240,000. Benson ADU Builders has managed these projects from structural engineering through final inspection, and we keep you informed with real-time tracking from day one.
Structural Engineering and Feasibility
Not every single-story home can carry a second floor without reinforcement, and that’s the first thing we check. We bring in licensed engineers, evaluate the existing foundation and framing, and give you a written answer on feasibility before you spend money on design work.
Staircase Placement and Flow
A second story has to connect to your existing layout without eating up a bedroom or turning your living room into a hallway. We plan stair placement early, often using space you already walk through, so the finished floor plan actually works day to day.
Garage Addition Contractors
Garage Addition Contractors build attached or detached garages, whether you need a place to park vehicles, store equipment, or create a workshop. This project makes sense when your current garage is too small, nonexistent, or you’re tired of parking in the elements. A new garage addition typically runs $25,000 to $75,000 for a standard two-car structure, with costs rising if you want a finished interior, electrical work, or an ADU conversion on top. Benson ADU Builders can also design a garage with a JADU above or beside it, giving you future rental income potential from day one.
Attached vs. Detached Design
An attached garage shares a wall with your house and usually costs less because you’re not building four exterior walls. A detached garage gives you more design freedom and keeps noise and fumes away from living space. We’ll price both options so you can decide with real numbers, not guesswork.
Workshop-Grade Finishes
If you’re building the garage to work in, the finish level matters. We install the electrical capacity, insulation, and durable flooring that a working space needs, and we’ll tell you which upgrades are worth the money and which ones aren’t.
Bathroom Addition Contractor
A Bathroom Addition Contractor builds a new full or half bath where none existed before, often carving space from an oversized closet, a hallway, or as part of a larger addition. You typically add a bathroom when your household size has outgrown the current bath count, or when a primary suite needs its own private bath. A new bathroom addition generally falls between $25,000 and $75,000, with the final number driven by plumbing distance from existing lines and the finish level you choose. Benson ADU Builders handles the rough-in, waterproofing, tile, and fixtures under one written price.
Plumbing Rough-In Strategy
The single biggest cost variable is how far the new drain lines have to run to reach your existing stack. We map that distance early and design the layout to minimize it without creating a bathroom that feels squeezed. You’ll see that math in the written estimate.
Waterproofing Standards
A bathroom addition that leaks is a slow-moving disaster, so we don’t cut corners on waterproofing. We use sheet membranes and proper pan construction on every job, and the work is covered by our 365-Day Done Right Promise.
Bedroom Addition Contractor
A Bedroom Addition Contractor adds a dedicated sleeping room to your home, usually as a ground-floor bump-out or as part of a larger wing. You need one when a growing family has maxed out the current bedroom count, when aging parents move in, or when you want a quiet guest room separate from the main living areas. Bedroom additions typically run $70,000 to $150,000 depending on square footage, whether a bath is included, and site conditions. Benson ADU Builders handles the framing, insulation, windows, and finish carpentry, and every bedroom we build meets current egress and fire-safety codes.
Egress and Code Requirements
A legal bedroom needs a window large enough to exit through in an emergency, plus specific electrical and smoke-detection requirements. We handle those details so you never end up with a “bedroom” that an appraiser or building inspector won’t count.
Closet and Storage Planning
A bedroom without storage becomes a problem room fast. We design closets into the footprint from the start, often using wall cavities you’d otherwise lose, so the room works as a real bedroom and not just a spare room.
Brands We Service
Benson ADU Builders is authorized to build with Dvele, one of the most respected prefab home manufacturers in the industry. Dvele panels arrive on site with integrated sensors and high-performance wall systems, and our crews are trained on their exact assembly sequence, so the finished envelope performs the way Dvele engineered it to.
We also build with Mighty Buildings and Plant Prefab, two brands that approach construction from opposite directions but share a common thread: quality control happens in a factory, not in a rainstorm. For Mighty Buildings, that means 3D-printed composite panels with tight tolerances. For Plant Prefab, it means panelized wood framing built indoors and shipped ready to assemble. Whether you have Dvele, Mighty Buildings, Plant Prefab, or any other make, we can help you plan, permit, and build it right.
Signs You Need a Pro Right Now
- You’re tripping over family members daily. When the morning bathroom line has three people in it and the kitchen doubles as an office, the house has stopped fitting your life. That’s a structural need, not a decor problem.
- Your lot won’t allow an outward bump-out. Setback rules and lot lines sometimes mean the only direction is up. A second story addition gets you the space without asking a neighbor’s permission or fighting the zoning board.
- You priced a move and it didn’t pencil out. Between real estate commissions, moving costs, and the new mortgage rate, a $100,000 addition can look like a bargain compared to a $700,000 move. We’ll help you run the comparison honestly.
- The garage has become a storage unit. When both cars live in the driveway because the garage is full of boxes, you’re paying for storage with your own curb. A garage addition or a dedicated storage room fixes the root cause.
- Your in-laws are moving in next year. Multi-generational living works best when everyone has a door that closes. A bedroom and bathroom addition, or an ADU with its own entrance, gives everyone enough separation to stay on good terms.
Our Process, Step by Step
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First call and needs assessment. You call (903) 568-7222 and talk to a live person, not a phone tree. We ask about your goals, your lot, your budget range, and your timeline, then we send you a short intake form to confirm the details in writing.
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Written scope and price. Before any demolition, you get a written price for the full project with a line-item breakdown. If something gets added later, it gets priced and approved in writing. No scope creep billed after the fact.
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Design and permitting. We handle the drawings, engineering, and permit submission, and we’ll tell you what your local jurisdiction is likely to require. You’ll see the plan before it goes to the city or county, and you’ll approve it in writing.
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Build and track. Background-checked, uniformed technicians show up on schedule, and you get real-time updates and before-and-after photos through the build. The invoice comes as a digital link you can pay from your phone, and you’ll always know who’s on your property.
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Walkthrough and guarantee. We walk the finished space with you, note any punch-list items, and fix them. Then you get the 365-Day Done Right Promise in writing: if anything isn’t right within a full year, we make it right.
How Much Does a Home Addition Contractor Cost?
Nationally, home additions run anywhere from $25,000 for a modest sunroom or garage to $240,000 or more for a full second story. A typical bathroom or bedroom addition lands in the $25,000 to $150,000 range depending on square footage and finish level. Most homeowners we work with are budgeting between $70,000 and $150,000 for a substantial addition that adds real living space.
The biggest cost drivers are foundation type, plumbing distance, roof tie-in complexity, and the materials you select. A slab-on-grade sunroom costs less than a second story with structural reinforcement, and moving a bathroom’s drain line fifty feet costs more than ten. The way to avoid overpaying is to get a written line-item price before work starts, so you can see exactly where the money goes, and to avoid any contractor who only gives you a verbal number.
Every Benson ADU Builders estimate is free and includes the full scope in writing: materials, labor, permits, and our 365-Day Done Right Promise. You’ll never get a “we’ll figure that out later” line from us, because we don’t build that way and we don’t write contracts that way.
Where We Work
Benson ADU Builders serves homeowners and businesses across the United States through local crews. We match you with a background-checked team that knows the trade and works under The Relay Visibility Guarantee, no matter where your project is located. Each local team is independently owned and operated, which means you get national buying power and local accountability.
Frequently Asked Questions About Home Addition Contractor
A home addition contractor is a builder who specializes in adding square footage, bedrooms, bathrooms, garages, sunrooms, or second stories to an existing home. They handle design, permits, foundation work, framing, and finishes under a single contract. Benson ADU Builders has provided this service since 2006 with written pricing and a 365-Day Done Right Promise.
Most home additions take between 8 and 20 weeks from permit approval to final walkthrough, depending on scope. A sunroom or garage is typically faster, while a second story or a full bedroom and bath wing takes longer. We’ll give you a written timeline with your estimate, and you’ll get real-time progress updates throughout the build.
Home additions range from $25,000 to $240,000 or more nationwide, depending on size, type, and finishes. A garage or sunroom starts lower, while a second story addition sits at the higher end. Your written estimate from Benson ADU Builders includes a full line-item breakdown so you know exactly what you’re paying for. Call (903) 568-7222 for a free estimate.
Yes. We’re authorized to build with Dvele, Mighty Buildings, and Plant Prefab, and our crews are trained on each brand’s specific assembly methods. If you already have a prefab unit or are considering one, we can help you plan, permit, and install it correctly.
For urgent structural issues related to an ongoing addition or a failed component, a live person answers our phone 24/7 at (903) 568-7222. We can’t build a full addition overnight, but we can assess urgent safety concerns quickly and schedule a free second visit if a covered repair fails.
Every project comes with our 365-Day Done Right Promise: if the work isn’t right within a full year, we make it right. That’s a written guarantee stamped on every project, plus a free second visit if any covered repair fails. It’s simple, and it’s in writing before you sign.
Start by making a list of must-haves and nice-to-haves, then gather any existing floor plans or survey documents you have. Think about your budget ceiling in real numbers, and call us at (903) 568-7222. We’ll walk you through the rest, including design, permits, and a written price.
Schedule Your Home Addition Contractor Service Today
Ready to add real square footage to your home without the guesswork? Call (903) 568-7222 today and talk to a live person about your project. You’ll get a free, no-obligation written estimate with a clear line-item price, a real timeline, and our 365-Day Done Right Promise behind the work. Troy Eastman and the team at Benson ADU Builders have built additions since 2006, and we’d like to put that experience to work on your home. Call now, 24/7.
Written by Troy Eastman, Owner at Benson ADU Builders, serving homeowners nationwide since 2006.
