Free written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
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AfterFast, Reliable Home Additions & ADU Across Denton
Adding square footage or building an ADU in Denton typically runs $45,000 to $130,000 for a room addition and $90,000 to $220,000 for a new detached ADU, with garage conversions landing between $30,000 and $80,000. If you’re in Denton and weighing whether to move or add on, the answer usually comes down to one thing: the lot you already own, in the neighborhood you already know. We’re Barrett & Sons Construction, and our Home Additions & ADU team has been opening up Denton homes long enough to know exactly what’s behind those walls before we quote a single dollar. Call us at (877) 610-1318 and we’ll walk the property with you, no charge inside the county.
Why Barrett & Sons Construction Is Denton’s Preferred Home Additions & ADU Company
Tom Barrett founded this company in 1998, and his sons run the crews that show up in Denton. You’ll see the same faces from the first estimate to the final inspection, which matters when a project runs six months and you’re making decisions every week. Our Denton customers tell us the same thing: the written change order process is what kept them sane. Every scope change, every allowance adjustment, every material swap arrives on paper with a price attached before work moves. That’s not a corporate policy. That’s how Tom has run jobs since before half the contractors in Denton had a website.
We answer our own phone at (877) 610-1318, 24 hours a day. Not a call center, not a voicemail box. If a Denton homeowner calls at 7 a.m. worried about a framing detail, a real person picks up. We also publish Tom’s name, address, and license number, because the last contractor most Denton customers used told them permits were optional. Ours aren’t. Never have been.
Our Home Additions & ADU Services in Denton
ADU Design & Permitting
Denton’s building department is stretched. We’ve watched permit queues grow as south Denton subdivisions boom, and the contractors who stay on schedule are the ones who front-load their applications and know which inspector covers which ZIP. We pre-stage permit packets for Denton jobs, including 76201, 76203, 76208, and 76210, before we submit. That means your ADU plans hit the queue complete, not piecemeal, and we don’t burn two weeks waiting on a missing structural detail. We also pull permits on every eligible job, and the inspector signs off before we drywall over anything.
Garage Conversion ADU
Converting a garage in Denton is the fastest path to rental income or an in-law suite, but it’s rarely as simple as finishing out the space. Older garages in Denton’s university neighborhoods were built with slab floors that were never engineered for living space, which means insulation, vapor barriers, and often a new subfloor. In newer 76208 and 76210 homes, the garage slab is usually fine, but the electrical panel may need a sub-panel to handle a kitchenette and washer-dryer. We price these realities into the contract from day one, not as a surprise at week six.
New Detached ADU
A detached ADU in Denton gives you a fully separate address, which rents higher than an attached unit and keeps your privacy intact. But Blackland Prairie clay doesn’t care how nice the floor plan looks. Deep piers or a post-tension slab are non-negotiable on virtually every new foundation in Denton, and that’s a line item that shows up in our quotes from the start. We’ve built detached ADUs from 400 to over 1,000 square feet in Denton, and every one of them started with soil prep and foundation engineering first.
Junior ADU & Interior Conversion
A junior ADU, often a converted attached sunroom or a sectioned-off portion of the existing home, is the most affordable way to create a rentable or multi-generational space in Denton. These projects usually run smaller than a full ADU, but the same rules apply: separate electrical circuits, proper egress, and a permit. In 76201’s older bungalows, we regularly find the existing sunroom was never permitted in the first place, which means we bring the whole space up to current code as part of the conversion.
What happens when you call
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A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Denton
We build with materials you can look up, not mystery brands off a van. On Denton additions and ADUs, we lean on Schluter for waterproofing in kitchens and baths, Sterling for budget-conscious bathroom fixtures that don’t feel cheap, and Grohe for plumbing trim that holds up to Denton’s hard water. We don’t stock every brand for every job, but we know what’s available locally and what ships fast, which keeps your Denton project from stalling on a backordered faucet.
Common Home Additions & ADU Problems We See in Denton Homes
- Knob-and-tube wiring behind pre-1960 walls. In Denton’s 76201 and 76203 bungalows, it’s still live in plenty of ceilings. A permit triggers a rewire once we open those walls, and we write an electrical allowance into the contract so the cost doesn’t ambush you later.
- Undersized original framing on second-story additions. Many 1920s to 1950s Denton homes were framed with studs and footings that don’t meet modern load requirements. If we don’t verify existing framing before we quote, your second-story addition will crack plaster and fail inspection.
- Blackland Prairie clay wrecking slab-tied additions. Denton’s clay swells when it rains and shrinks in drought. A room addition tied to an existing slab without deep piers will rack, bind doors, and crack drywall within two seasons. We engineer for that movement up front.
- Permit queue stalls on ADU conversions in 76208 and 76210. Denton’s building department processes some of the highest per-capita permit volumes in Texas. If your contractor files for electrical rough-in after framing starts, the project halts for weeks. We file before we demo.
Pricing for Home Additions & ADU in Denton, TX
Here’s what we tell every Denton homeowner at the first meeting. These are real numbers, not teaser quotes.
| Project Type | Typical Denton Range |
|---|---|
| Home Addition (room addition, bump-out) | $45,000 - $130,000 |
| ADU Construction (new detached unit) | $90,000 - $220,000 |
| Garage Conversion ADU | $30,000 - $80,000 |
What moves these numbers in Denton? Foundation engineering on Blackland Prairie clay is the big one, especially for any addition that ties into an existing slab or a 1950s pier-and-beam. Code-triggered electrical upgrades on older homes are the next most common cost we see. And on ADUs, separate utility connections, particularly water and sewer taps in 76208, add real dollars. We give you a written line-item quote before you sign, so none of this shows up as a surprise invoice. Call (877) 610-1318 for a free estimate, and ask about our Free Second Opinion on any written estimate you’ve already received.
We Also Serve Cities Near Denton
Our crews run Home Additions & ADU in Denton and the surrounding towns, including Corinth, Lantana, Flower Mound, and Lake Dallas. If you’re just outside Denton in one of those communities, the same pricing, the same written change orders, and the same 90-Day Done Right Promise apply. Dispatch and scheduling are coordinated from our Dallas-Fort Worth office, and the crews serving Denton are local to the area.
Serving Denton, TX - Our Local Coverage Area
We’re based in the Denton 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 - Home Additions & ADU in Denton
A permit on a pre-1960 Denton home will trigger a code review of everything we expose, which almost always means replacing knob-and-tube wiring with modern Romex, adding GFCI and AFCI protection, and often reinforcing original framing that doesn’t meet current load requirements. On a 1949 craftsman bungalow off Bell Avenue in 76201, our crew opened a kitchen wall for a room addition and found original knob-and-tube still live above the ceiling. Because our scope of work carried a written electrical allowance, we priced the rewire, got the homeowner’s approval in writing that day, and kept the addition framing on schedule while the city inspector signed off before drywall. The key is writing these allowances into the contract before you sign. Call (877) 610-1318 and we’ll walk you through exactly what your home’s era will trigger.
A garage conversion ADU in 76208 can often tie into the existing house water line if it’s sized adequately, but sewer is trickier, and many Denton homes in 76208 were plumbed with lines that won’t handle a second full bath without upsizing. Denton code requires separate metering on a true detached ADU in many cases, and a garage conversion that adds a kitchen and bath usually triggers a plumbing permit that forces the issue. We verify meter size, line capacity, and sewer grade before we quote. That way the tap fee, or the upsize, is a line item on paper, not a phone call at week eight.
Blackland Prairie clay in Denton’s 76203 ZIP swells dramatically with moisture and shrinks in drought, which means your existing pier-and-beam foundation has probably already moved, and adding a second story changes the load on every pier. We inspect the existing footings and pier spacing first. If they’re undersized for the added load, which is common on 1950s Denton homes, we install deeper piers or supplemental footings before any framing goes up. Skip that step, and the new second story cracks at the stairwell corners and binds doors within two seasons. Call (877) 610-1318 for a foundation assessment as part of your free estimate.
Denton’s building department is processing one of the highest per-capita permit volumes in Texas, driven by the greenfield buildout in south and east Denton, and inspections get scheduled on a first-filed, first-inspected basis. Contractors who file for rough-in inspections after work has already started end up at the back of a long queue. We front-load our Denton permit applications, particularly for ADU projects in 76208 and 76210, and we pre-schedule inspection windows before demo starts. It’s not a guarantee against every delay, but it’s the difference between a one-week snag and a month-long stall. Our written scope of work includes a realistic timeline, not an optimistic one.
Any permitted livable square footage added to a Denton home will generally be picked up by the Denton Central Appraisal District at the next assessment, and a junior ADU conversion is no exception. What you can control is whether the space is assessed as unfinished storage or finished living space, and whether the improvements are documented correctly. We don’t advise anyone to skip permits to avoid taxes. That catches up with you when you sell. What we do is build the space to code, document it properly, and let you make the call on how the space is used. Your tax advisor can give you the specifics for the property in 76201. Call (877) 610-1318 to talk through the project scope first.
If you’re ready to add square footage or build an ADU in Denton, call Barrett & Sons Construction at (877) 610-1318. We’ll walk your property, give you a written line-item estimate, and show you exactly what the Denton permit process will require. No trip charge inside the county, and we offer a permanent 10% Senior and Veteran discount.
Written by Tom Barrett, Owner at Barrett & Sons Construction, serving Denton since 1998.