A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateTrusted Room Addition Contractor for Dallas Homeowners
Room additions in Dallas cost between $85 and $210 per square foot depending on whether you’re building a conventional stick-built addition or using a modular platform. That’s the number most contractors won’t put in writing before you sign. We do. Fielding ADU Dallas, led by Reed Calloway, has built to The Garrison Standard since 2006: written price before any work starts, permitted work done by the book, and a Room Addition Contractor Maintenance Checklist for Dallas Homeowners backed by a 365-day written guarantee on every project. If you’ve already dealt with a contractor who moved the price at the door or left the permit board blank, you know exactly why that matters. Call (903) 342-8977 and talk to a live person, any hour, any day.
Key Takeaways
- Room additions in Dallas typically cost $85 to $210 per square foot before permit fees, depending on build method and finishes.
- Fielding ADU Dallas puts the price in writing before any work starts. The number you approve is the number on the final invoice.
- Every addition is backed by the 365-Day Done Right Promise: if work fails within one year, we return and fix it at no charge.
- We work in Dallas, Irving, Mesquite, Grapevine, Carrollton, Far North Dallas, DeSoto, Coppell, Farmers Branch, Sachse, Seagoville, and Glenn Heights.
- Live-person phone coverage 24/7. Call (903) 342-8977 for a free written estimate.
Sunroom Builders
Sunroom Builders construct glass-enclosed living spaces that attach to your existing home, and in Dallas the job typically runs $120 to $190 per square foot before permit fees. A sunroom gives you usable square footage without a full foundation pour or roofline change, which makes it one of the faster additions to permit and build. At Fielding ADU Dallas we handle the full scope: slab or deck framing, thermal-rated glass, roof tie-in, and the finish work from floor to trim. Reed Calloway’s crews build to The Garrison Standard, so the price goes in writing before the first board is cut.
Three-Season and Four-Season Rooms
A three-season sunroom keeps cost down by using single-pane glass and no dedicated HVAC. A four-season room costs more because it gets insulated glass, a ducted or mini-split climate line, and a tighter thermal envelope. We’ll walk you through both options against your actual budget, not a brochure number.
Permitting and Roof Tie-In
Dallas code treats attached sunrooms as additions, which means structural review and a roof tie-in inspection. Our crew pulls the permit, schedules the inspection, and stands on site until it passes. No permit board left blank.
Room Additions
Room Additions mean extending the footprint or repurposing existing space to create a genuinely new room, and in Dallas you should budget $140 to $210 per square foot for stick-built work. The price moves with foundation type, roofline changes, electrical runs, and finish level, which is why we write the number down before work starts. Fielding ADU Dallas builds bedroom additions, family room extensions, home offices, and ground-floor primary suites. Every job is permitted, inspected, and backed by the 365-Day Done Right Promise.
Foundation and Structural Scope
Most Dallas additions sit on slab-on-grade foundations, and the soil in this part of Texas means pier depth and compaction matter more than the finish on the drywall. We’ve poured additions in Carrollton and Mesquite where the soil report changed the engineering. We show you the soil report and the fix, not a change order you never saw coming.
Interior Finish Standard
Our base finish includes level-4 drywall, solid-core doors, standard baseboard, and code-compliant electrical. If you want higher-end trim, solid wood shelving, or custom millwork, the line items get added before you approve the job. No surprises at the final invoice.
Modular Home Addition
Modular Home Addition refers to factory-built modules delivered to your Dallas lot and set on a prepared foundation, with costs typically running $95 to $165 per square foot before site work and permit fees. The factory setting controls material waste and weather delays, which is why a modular addition can install in days rather than weeks. Fielding ADU Dallas has build fluency with leading modular platforms, and we handle the full site side: pad prep, utility rough-in, module set, and finish tie-in.
Site Prep and Utility Runs
A modular addition still needs a real foundation, and in Dallas that means an engineered slab with proper compaction. We also run the electrical feeders, plumbing lines, and HVAC connections from the main house to the module. The module arrives ready to set, but the site work is what makes it a permitted addition.
Platform Matching
Not every modular platform fits every lot. We work with Mighty Buildings, Boxabl, and Plant Prefab, and we’ll tell you honestly which one matches your setback, your budget, and your timeline. If a conventional build makes more sense and I mean cost and schedule wise, we’ll say that too.
Home Addition Plans
Home Addition Plans are the architectural drawings and permit documents required before any room addition in Dallas can break ground, and plan sets for a standard addition typically run $1,800 to $4,500 depending on structural complexity. The plan set is what the city reviews, what the inspector checks against, and what keeps your project legal. Fielding ADU Dallas prepares or coordinates every plan set in-house, then walks it through the Dallas permitting offices until it’s approved. You never hand the city a set of plans you haven’t read.
Setback and Variance Language
If your addition needs a setback variance the city’s written permission to build closer to the property line than the standard rule allows we handle the application and the hearing prep. Dense lots in Farmers Branch and Coppell run into this routinely. We’ll tell you before you spend money whether your footprint will trigger one.
Plan Revisions and Change Orders
Plan revisions happen, but they shouldn’t be a profit center. If you change the window schedule or move the door, we reprice that line item in writing before the change is made. The Garrison Code: price in writing, by the book, stand behind it for a year.
In Law Suite Builders
In Law Suite Builders construct attached or detached living quarters meant for an aging parent, adult child, or long-term guest, and a Dallas in-law suite typically runs $110 to $190 per square foot depending on whether it includes a kitchenette and private bath. These suites often include a separate entrance, which changes the egress, electrical, and sometimes the fire separation requirements. At Fielding ADU Dallas we build both attached and detached in-law suites, and we design them so they can function as a rental unit later if Dallas zoning allows it.
Separate Entrance and Egress
A separate entrance means adding a rated exterior door and sometimes a path to grade that meets fire code. We handle the egress window sizing, the door swing, and the path of travel so the suite works as a dwelling, not just a bonus room.
Kitchenette and Bath Scope
Most in-law suites in the Dallas area include a wet bar or kitchenette with a small fridge, sink, and microwave, plus a three-quarter bath. Plumbing runs drive the price. We’ll show you the line items for each fixture and let you decide what actually fits your scope.
ADU Conversion
ADU Conversion means turning an existing structure, usually a garage, into a legal accessory dwelling unit, and in Dallas a garage conversion typically runs $90 to $160 per square foot before finish upgrades. The structural shell already exists, which saves money, but electrical, insulation, HVAC, and the bathroom addition are all in scope. Fielding ADU Dallas converts attached and detached garages throughout Dallas, Irving, and Mesquite, and every conversion is permitted through the city. Whether you need a Room Addition Contractor - Irving or work elsewhere in the metro, we handle the full build from demo to final inspection. We handle the full build from demo to final inspection.
Garage Slab and Drainage
Garage slabs in Dallas are often lower than the main house floor, which means you either step down or we build the floor up. Drainage matters too: a converted garage needs proper floor slope and sometimes a sump if the lot drains toward the structure. We’ve corrected this on jobs in Sachse and Seagoville where the original slab wasn’t pitched right.
Separate Utility Metering
If the ADU will be rented separately, Dallas may require sub-metering or a separate address. We coordinate with the utility providers and the city so the conversion is legal as a dwelling unit, not just a permitted remodel. You’ll know before drywall goes up.
Brands We Service
We build with and install ADUs and additions from Mighty Buildings, Boxabl, and Plant Prefab, and we’re fluent with Tuff Shed-style structures for simpler accessory builds. Our crews understand the set tolerances, the connection details, and the finish specifications of each platform, which means the module arrives and fits the foundation the first time.
Fielding ADU Dallas also has real build experience with conventional materials, including James Hardie siding, so if a platform doesn’t match your lot or your scope we can build the same addition stick-by-stick. Whether you have a Mighty Buildings unit already ordered or you’re comparing Boxabl against a conventional build in Far North Dallas, we can walk the full scope with you.
Signs You Need a Pro Right Now
- Your contractor won’t put the price in writing. If you’re getting verbal estimates or “we’ll see how it goes” pricing, that’s a red flag. In Dallas, a room addition without a written price is a blank check. We hand you the number before any work starts, and that’s the number on the invoice.
- The permit board is empty or the permit has lapsed. An active permit must be posted on site for any addition in Dallas. If the board is blank, there’s no inspection scheduled, and that means no one is checking the work. Our permit is on the board from day one.
- Work has stopped and no one is returning calls. Abandoned room additions lose value fast, especially in Dallas heat, where exposure causes framing to warp. If your previous contractor ghosted you, call us. We’ll document what’s there, tell you what’s salvageable, and price the completion in writing.
- The scope keeps changing mid-project. A reputable room addition contractor locks the number before the first cut. If your current crew keeps finding “unforeseen conditions” and charging for them, get a second read. We’ll review the line items and show you what’s legitimate and what isn’t.
- You’re not sure your addition complies with Dallas setback or zoning rules. Building too close to a property line without a variance can get you a stop-work order and a difficult conversation with the city. If you’re unsure, get it checked before the framing goes up.
Our Process, Step by Step
- 1
On-Site Walkthrough. We walk your Dallas property, measure the existing structure, check the soil, and review the lot lines against any existing survey. Reed Calloway or a senior lead often attends this first visit personally. You’ll get a straight read on feasibility, not a sales pitch.
- 2
Written Scope and Price. We produce a line-item proposal with material allowances, labor, permit fees, and a clear schedule. This is the Garrison Standard: the number you approve on day one is the number on the final invoice. No allowance games, no open-ended contingencies.
- 3
Plans, Permits, and Engineering. We coordinate the architectural drawings, structural engineering, and the Dallas permit application including any variance hearings. You get copies of everything. We don’t start sawing until the permit is posted.
- 4
Build and Inspections. Our background-checked, uniformed crew works through each phase: foundation, framing, mechanicals, drywall, finish. Every scheduled inspection is passed, and we walk you through each completed phase before the next one starts. You always know who is on your site.
- 5
Final Walkthrough and 365-Day Guarantee. We complete a punch list, close out the permit, and hand you a written guarantee that covers workmanship defects for one full year. If something fails inside that year, we come back at no charge and correct it. That’s the Done Right Promise.
How Much Does Room Addition Contractor Cost in Dallas?
A conventional room addition in Dallas runs $140 to $210 per square foot, while a garage conversion or ADU conversion lands closer to $90 to $160 per square foot, and a modular home addition falls between $95 and $165 per square foot before site work. These are real numbers we write into proposals every week. The big cost drivers are foundation type, roofline changes, bathroom or kitchenette inclusion, and whether the addition requires a setback variance. A simple bedroom bump-out without plumbing will sit near the bottom of the range; a primary suite with a full bath and a new HVAC zone will sit near the top.
How do you avoid overpaying? Get a line-item proposal, not a lump-sum number. Ask whether the permit fee is included or passed through. Ask whether material allowances are realistic or intentionally low so the final invoice balloons. Our free estimate includes a written scope, a broken-out price, and a plain-English explanation of every line. No deposit-before-pricing games. Call (903) 342-8977 and we’ll schedule your walkthrough.
Our Service Area Near Dallas
Fielding ADU Dallas builds room additions throughout Dallas, Irving, Mesquite, Grapevine, Carrollton, Far North Dallas, DeSoto, Coppell, Farmers Branch, Sachse, Seagoville, and Glenn Heights. Most of our work happens within a 40-minute drive of downtown Dallas, which means we can be on your site for the walkthrough within a few days of your call. If you’re looking for a Room Addition Contractor in Irving or a Room Addition Contractor in Mesquite, we serve both cities directly. You can also read more about our home page and the full Room Addition Contractor in Dallas scope.
Serving Dallas, TX - Our Local Coverage Area
We’re based in the Dallas area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
Frequently Asked Questions About Room Addition Contractor in Dallas
A Room Addition Contractor in Dallas manages the full scope of adding livable square footage to your home, from plans and permits through foundation, framing, mechanicals, and finish work. In Dallas, the contractor’s job includes coordinating city inspections and pulling the permit that gets posted on site. Fielding ADU Dallas handles every phase in-house or with vetted trade partners, and we hand you a written price before any work starts.
A conventional stick-built room addition in Dallas typically takes 8 to 14 weeks from permit approval to final inspection. A modular home addition can set in days once site prep, foundation, and utility rough-ins are complete, though the overall schedule usually lands between 6 and 10 weeks. The biggest schedule variable is city plan review, which moves faster when the plan set has no errors. Call (903) 342-8977 for a schedule estimate based on your specific scope.
A room addition in Dallas runs $85 to $210 per square foot depending on build method, with conventional stick-built work at $140 to $210 per square foot and modular or ADU conversion work on the lower end. Foundation type, bathroom scope, roof changes, and permit or variance requirements move the number. Our written proposal breaks out every line item so you can see exactly where the money goes. Estimates are free.
Yes. Fielding ADU Dallas builds with Mighty Buildings, Boxabl, and Plant Prefab platforms, and we’re also fluent with Tuff Shed-style structures and conventional James Hardie builds. We match the build method to your lot, budget, and timeline, and we’ll tell you plainly if a platform doesn’t fit your scope. Call (903) 342-8977 and we’ll talk through the options.
Yes, and this happens more often in Dallas than homeowners expect. We’ll document the existing work, identify what’s salvageable, check the permit status with the city, and write you a completion price before we touch anything. If the old permit has lapsed, we’ll file for renewal or start a new application. You’ll know the full number before we resume work.
Every room addition we build is covered by the 365-Day Done Right Promise, a written one-year guarantee on workmanship defects. If something fails inside that year, we return at no charge and correct it. The guarantee terms, coverage, and remedy are spelled out on paper before you sign. No verbal promises.
Have your property survey if you have one, and know roughly where you want the addition to go. It helps to have any HOA documents if your neighborhood has design-review rules. You don’t need to clean or stage anything, just give us access to the yard and the existing structure. We’ll handle the measurements, the soil read, and the feasibility check on the spot.
Schedule Your Room Addition Contractor Service in Dallas Today
You already know what a bad contractor looks like. Missed schedule, moving price, empty permit board. Fielding ADU Dallas does it differently: written price first, permitted work by the book, and a full year of written guarantee. Call (903) 342-8977 to schedule your free estimate. A live person answers, any hour, any day.
Written by Reed Calloway, Owner at Fielding ADU Dallas, serving Dallas since 2006.
