Trusted Home Addition Contractor Nationwide
A home addition is the most direct way to get more livable square footage without moving. It adds bedrooms for growing families, bathrooms for aging parents, or sunrooms for people who just want more daylight. Lodgewick ADU Builders, our Home Addition Contractor in Los Angeles, handles the whole job from first sketch to final inspection, and we’ve done it since 2010 as part of the Kingswell family of home-service companies. The difference with us is The Kingswell Guarantee: a written price before any work begins, a real arrival window, a clean job site, and a written guarantee on every project. If something isn’t right within 365 days, we come back and make it right at no charge. That’s the 365-Day Done Right Promise, and it’s in writing on every job we take. Call (254) 602-5618 and a live person answers, any hour, any day. Russ Delmar leads our team, and he’s built the whole operation around one idea: homeowners should never have to guess what a contractor will actually do, or what it will actually cost.
Sunroom Addition
A Sunroom Addition extends your home with a glass-walled living space that brings in natural light without the full cost of a traditional room extension. You might want one for a morning coffee spot, a plant room, or a place to read through every season. Lodgewick ADU Builders designs and builds sunrooms that fit the existing roofline and foundation, using engineered glass packages and proper insulation so the space stays comfortable year-round. Sunroom additions typically run $28,000 to $75,000 depending on size, glass package, and whether you want heating and cooling tied into the existing system. We give you a written price before any work starts, so you can compare that number against other quotes with full transparency.
Glass Package and Climate Control
The glass you choose drives both comfort and cost. Low-E double-glazed units cost more upfront but cut heat gain in summer and heat loss in winter. We walk you through the trade-offs and recommend what matches your local climate and how you plan to use the room.
Foundation and Roof Integration
A sunroom needs a proper foundation, not a patio pour. Our crews pour reinforced slabs with code-required footings, then tie the new roof into your existing structure with flashing details that prevent leaks at the junction. Permits are pulled and inspections passed before we call the job done.
Room Addition Contractor
A Room Addition Contractor builds a new finished room onto your existing home, and that’s exactly what Lodgewick ADU Builders does, as detailed in The Complete Home Addition Contractor Guide for Los Angeles Homeowners. The most common reason homeowners call us is a house that suddenly feels too small: a new baby, a parent moving in, or a remote job that needs a real office instead of a corner of the living room. A single room addition typically runs $45,000 to $110,000 depending on square footage, site conditions, and finish level. We handle the full scope: demo, foundation, framing, roofing tie-in, electrical, plumbing if the room needs it, drywall, flooring, and paint. Your written price covers all of it, so there’s no surprise change order at the door.
Site Evaluation and Feasibility
Before we quote anything, we check setbacks, lot coverage limits, and how the addition will tie into your existing roof plane and foundation. Some lots have utility easements or slope issues that change the design. We flag those early so the price in writing is the price that holds.
Permits and Inspections
We pull every permit required for the addition and schedule each inspection. Homeowners who have been burned before tell us this is where previous contractors disappeared. Ours don’t. The job isn’t done until the final inspection passes and we hand you the written guarantee.
Second Story Addition Contractor
A Second Story Addition Contractor builds upward rather than outward, which is the right call when your lot is too small for a ground-floor addition or you want to preserve backyard space. Adding a second story often costs $180 to $320 per square foot of new space, so a 400-square-foot upper-level addition typically lands between $72,000 and $128,000 before finish selections. Lodgewick ADU Builders handles the structural engineering, the temporary roof opening, the new floor system, and the stair connection. We’ve worked with major prefab manufacturers like Dvele and Plant Prefab on upper-level components, and we know how to sequence the work so your family can stay in the home during most of the project.
Structural Load and Engineering
A second story adds real weight to the existing walls and footings. We bring in a licensed structural engineer to evaluate the current framing and specify what needs reinforcement. That report goes into your written quote, so you see exactly what the structure requires and what it costs.
Stair Placement and Flow
Where the stairs go shapes how livable the new floor feels. We look at existing traffic patterns, closet space, and headroom to find a stair location that doesn’t sacrifice a bedroom or bathroom downstairs. That decision is made before the quote is finalized.
Garage Addition Contractors
Garage Addition Contractors build new garage space either attached to the home or as a separate structure, and Lodgewick ADU Builders does both. You might want more room for vehicles, a workshop, or storage. A detached two-car garage addition typically runs $40,000 to $90,000 depending on size, electrical service, and whether you add a finished interior. Attached garages often cost less because they share one wall with the house, but both require proper slab work and code-compliant framing. We write the price before we start, show up in the window we give you, and leave the site clean every day. Boxabl and Mighty Buildings offer panelized and modular garage systems we’ve installed, and we match the right approach to your lot.
Electrical and Workshop Planning
A garage that runs power tools or an EV charger needs more than a single outlet. We plan the panel capacity, outlet placement, and lighting early so you’re not running extension cords through the door. That plan is part of the quote, not an afterthought.
Slab and Drainage Details
Garage slabs carry vehicle weight and need proper grading so water flows away from the doors. We pour reinforced concrete with the right expansion joints and slope, then verify drainage before walls go up. A slab that pools water is a problem you’ll live with for decades.
Bathroom Addition Contractor
A Bathroom Addition Contractor builds a new full bath, half bath, or primary-suite bath where one didn’t exist before. The need usually comes from a household where one bathroom isn’t enough anymore. A new full bathroom addition runs $35,000 to $80,000 depending on whether you need new plumbing runs, how far the room sits from existing drain lines, and the fixtures you choose. Lodgewick ADU Builders handles rough plumbing, waterproofing, tile, fixtures, exhaust ventilation, and finish work. We provide the written price for everything up front, and we don’t start until you’ve approved the full scope in writing.
Plumbing Rough-In and Venting
A new bathroom needs supply lines, drain lines, and a proper vent stack. If the addition sits far from the main stack, that distance affects labor and materials. Our plumbers assess the existing plumbing before we quote, so the number you see includes the real cost of getting water in and out.
Waterproofing and Tile Systems
The difference between a bathroom that lasts and one that leaks is what’s behind the tile. We install full waterproofing membranes around the shower or tub surround, not just cement board. That’s a code requirement in most areas and a non-negotiable part of how we build.
Bedroom Addition Contractor
A Bedroom Addition Contractor adds a code-compliant sleeping room with proper egress, insulation, and ventilation. Growing families, multi-generational households, and people caring for an aging parent are the most common reasons we hear. A bedroom addition typically runs $40,000 to $95,000 depending on square footage, closet build-out, and whether you’re adding an attached bath. Lodgewick ADU Builders designs the room to meet egress window requirements, smoke and CO detector standards, and local energy codes. Then we build it under the same written price and 365-Day Done Right Promise as every other project we take.
Egress and Safety Requirements
A legal bedroom needs an egress window large enough for a fire escape, not just any window. We size the window opening to code and place it correctly for the room’s layout. If the local inspector flags anything, we fix it before final inspection, not after.
Closet and Storage Build-Out
Most people adding a bedroom also want real storage. We build closets with shelving and hanging rods into the quote, plus any attic access or linen storage that works with the new roofline. You tell us how you’ll use the room, and we design the storage to match.
Brands We Service
Lodgewick ADU Builders works hands-on with several established prefab and panelized ADU brands. We’ve installed Dvele units, which come with integrated smart-home systems and a factory-built shell that reduces framing time on site. Our crews know how to set the modules, tie in the utilities, and finish the interior to match the existing home. Mighty Buildings brings 3D-printed panel construction that cuts material waste and speeds up delivery, and we’ve managed the foundation, panel placement, and finish work on those projects.
We also work with Plant Prefab and Boxabl systems where the project calls for a faster build cycle or a tighter site. Each brand has different crane requirements, utility connection points, and finish kits, and we know those specifics before the modules arrive. Whether you have one of these systems specified or you’re open to a conventionally framed addition, we can give you a written price and a written guarantee on the full project.
Signs You Need a Pro Right Now
- You’ve outgrown the house but not the neighborhood. When every bedroom is taken and the dining table has become an office, an addition costs less than moving once you factor in closing costs, commissions, and the price of the next house up. We can tell you what’s feasible on your lot in one visit.
- Your foundation shows cracks or settling at the corners. That’s a structural signal, not a cosmetic one. Before any addition gets built, the existing foundation has to be sound. We include a foundation assessment in the quote process so you’re not building new space on a shifting base.
- You’ve gotten bids that don’t match each other. If one contractor is at $45,000 and another at $85,000 for the same room, somebody’s scope is wrong or one of them plans to change the price later. Our written quote itemizes what’s included so you can compare line by line.
- Your roofline has visible sag or water staining near the eaves. Adding onto a house with an existing roof problem just puts a lid on the problem. We inspect the current roof and structure as part of the estimate and include any needed repairs in the written scope.
- You’re doing the math on permits and realize nobody pulled them last time. Unpermitted work becomes your problem when you sell or refinance. We pull permits on every addition, and we don’t start until the permit is posted.
Our Process, Step by Step
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Call and talk to a person. When you call (254) 602-5618, a live person answers. You describe what you want to add, and we ask about the lot, the existing house, and how you plan to use the space. That conversation tells us whether an on-site visit makes sense.
- 2
On-site assessment and measurements. We walk the lot, measure the existing structure, check setback limits and utility locations, and photograph the areas where the new addition will tie in. Russ Delmar or a senior lead reviews every site before we put a number on paper.
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Written scope and written price. You receive a line-item quote that covers permits, foundation, framing, roofing, rough-ins, drywall, finishes, and site cleanup. No allowances that turn into extra bills later. You sign the quote, and the price is locked.
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Build with a fixed schedule and a clean site. We give you a defined arrival window for our crew each day. The site is cleaned at the end of every workday. Inspections are scheduled and passed at each required stage, and you get a walkthrough at rough-in and before final.
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Final walkthrough and the written guarantee. When the addition is complete, we walk every room with you and fix anything on the punch list. Then we hand you the 365-Day Done Right Promise in writing. If something fails within a year, we come back free and make it right.
How Much Does Home Addition Contractor Cost?
A home addition typically runs between $28,000 and $320 per square foot depending on the room type and scope, which means most projects land between $28,000 and $128,000 nationally. A sunroom is the most budget-friendly at $28,000 to $75,000. A garage addition runs $40,000 to $90,000. A bedroom or bathroom addition falls in the $35,000 to $95,000 range. A second story addition costs the most because it requires structural reinforcement and stair integration, typically $72,000 to $128,000.
What moves the price: square footage, foundation work, plumbing rough-in distance, roof tie-in complexity, finish level, and whether your local code requires upgrades to the existing electrical panel. The surest way to avoid overpaying is to get a written, line-item quote that locks the scope. Our free estimate includes a site walk, measurements, and a written price with no allowances and no open-ended change orders. Call (254) 602-5618 to schedule yours.
Where We Work
Lodgewick ADU Builders serves homeowners across the United States, including as a Home Addition Contractor in Huntington Park, through local crews operating under The Kingswell Guarantee. Each Lodgewick location is independently owned and operated, which means the team that quotes your project is the team that builds it. The same written price, arrival window, clean-site standard, and 365-Day Done Right Promise applies on every job, everywhere we work. Call (254) 602-5618 and we’ll connect you with the crew that covers your area.
Frequently Asked Questions About Home Addition Contractor
A home addition contractor is a licensed builder who designs, permits, and constructs new finished living space attached to or adjacent to your existing home. That includes room additions, second stories, garage additions, and sunrooms. Lodgewick ADU Builders has performed this work since 2010, with a written price and written guarantee on every project.
Most single-room additions take 8 to 16 weeks from permit approval to final inspection, depending on scope, weather, and inspection scheduling. A second story addition usually runs 16 to 24 weeks because of structural work and the temporary roof opening. We give you a written schedule with the quote and update you at every inspection milestone.
A home addition typically costs $28,000 to $128,000 depending on the type of room, square footage, and finish level. A sunroom is the least expensive option, while a second story addition is the most. Call (254) 602-5618 for an exact quote. Estimates are free and the price we quote is the price you pay.
Yes. We work hands-on with Dvele, Mighty Buildings, Boxabl, and Plant Prefab systems, including foundation setup, module placement, utility tie-in, and finish work. Our crew knows each brand’s connection points and installation requirements before the modules arrive. Call (254) 602-5618 to talk through which system fits your lot.
For structural emergencies like a failing foundation under an existing addition or storm damage to a partially framed project, we respond as fast as local crews can mobilize. A live person answers calls 24/7 at (254) 602-5618, and we’ll get someone out to assess the situation. Permanent repairs still follow the written price and written guarantee process.
Every addition we build includes the 365-Day Done Right Promise in writing. If the work isn’t right within 365 days, we come back and make it right at no charge. That covers structural, finish, and installation defects on work we performed. The exact terms are printed on the guarantee document you receive before the job starts.
Have a rough idea of the room type, desired square footage, and how you want to use the space. Clear access to the areas where the addition will tie in, including the backyard, crawlspace, or attic. If you have a survey or previous permit documents, have those ready. We handle the rest during the site walk, and you’ll get a written price after that visit.
Schedule Your Home Addition Contractor Service Today
You deserve a contractor who puts the price in writing before work starts, shows up when promised, and comes back if something isn’t right. That’s The Kingswell Guarantee, and it’s been our standard since 2010. Call (254) 602-5618 for a free, no-obligation estimate on your addition. A live person answers any time, day or night.
Written by Russ Delmar, Owner at Lodgewick ADU Builders, serving homeowners across the United States since 2010.