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 Lantana
Home additions and ADU construction in Lantana typically runs $45,000 to $130,000 for a room addition and $90,000 to $220,000 for a detached ADU, with garage conversions landing between $30,000 and $80,000. But before you get anywhere near a number you can trust, there’s a Lantana-specific process you need to know about: every exterior addition or detached unit must clear both the Lantana Architectural Review Committee and Denton County permitting before a single footing gets poured. Skip either one and you’ll get a stop-work order, not a foundation. We’re Barrett & Sons Construction, and we’ve been navigating this exact dual-approval process for Lantana homeowners since the first homes went up here. Call (877) 610-1318 for a free estimate on your addition or ADU, and we’ll walk you through what your specific lot will actually require.
Why Barrett & Sons Construction Is Lantana’s Preferred Home Additions & ADU Company
Tom Barrett founded this company in 1998, and his sons run the crews. That matters in Lantana because the homes here aren’t like what you find ten minutes down the road in Flower Mound or Highland Village. Lantana is almost entirely a master-planned community built out between roughly 2003 and 2015 by Republic Property Group, and virtually every home sits on a post-tension slab engineered for Blackland Prairie’s expansive clay. When we come out to Lantana, we’re not guessing about that. We know the build-out, we know the HOA’s Architectural Review Committee, and we know Denton County’s permitting desk.
Homeowners here tell us the same thing: they got burned by a contractor who quoted one price and then showed up with a different bill. That doesn’t happen on our jobs. Every change order arrives in writing before work moves forward. Every permit gets pulled. And every job carries the 90-Day Done Right Promise in writing on the contract: if it’s not done right, Tom comes back and makes it right, one call.
We answer our own phones. A live person picks up 24 hours a day, seven days a week. Not a voicemail box. Not an out-of-state call center. When you call about a room addition off FM 407 in the 76226 zip code, you get someone who knows where that is.
And you should look up our license number before you sign anything. Tom Barrett publishes his name, his address, and his license number. The permit inspector works for you, not for me. That’s why I like him.
Our Home Additions & ADU Services in Lantana
We handle the full scope of Home Additions & ADU work for Lantana homeowners, from first sketch to final inspection. Here’s what that looks like in practice across the Lantana neighborhoods we work in most.
ADU Design & Permitting
This is where Lantana projects live or die. An ADU here isn’t just a Denton County building permit; it’s also a design review in front of the Lantana Architectural Review Committee. We prepare both packages at the same time. Drawings that match the development’s approved exterior palette, setback compliance for your specific lot, and county submittals that reference the original builder’s engineering specs. If you’re considering a detached ADU on a post-tension slab lot near Lantana Estates or the Bridlewood area, this is the order of operations that keeps you from pouring a footing the ARC will reject.
New Detached ADU
A new detached ADU in Lantana runs $90,000 to $220,000 depending on size, finishes, and site work. That’s real money, and the riskiest part isn’t the framing. It’s the slab. Lantana’s clay soil expands hard after spring rains and contracts through summer drought, so any new structure needs footings engineered for that movement from day one. We also have to locate and map the tensioned cables in your existing slab before any trenching or utility connection work, because severing one cable can cause irreversible structural damage and void the original builder’s engineering specs. Scans happen before anything else.
Garage Conversion ADU
Garage conversions in Lantana run $30,000 to $80,000, and they’re popular because they keep the ADU attached while adding real living space. But these 2000s-era garages weren’t built as living space. The original subfloor and moisture barrier on a post-tension slab can turn a garage conversion into a mold problem if you don’t address them before the bathroom rough-in goes in. We’ve seen it. We also see the ARC requiring the garage door opening to be replaced with fenestration that matches the original elevation, which means the exterior design review happens before you even price the windows.
Junior ADU & Interior Conversion
A junior ADU, also called an internal ADU, converts existing interior space like a bonus room or a ground-floor suite into a self-contained unit. In Lantana, this is often the fastest path because it rarely triggers the Architectural Review Committee’s exterior review. But Denton County still requires the same plumbing, electrical, and egress compliance as a full ADU, and you’re still working around post-tension slab constraints for any new water or drain lines. We handle the design, the permits, and the build.
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 Lantana
We don’t install mystery materials off a van. On Lantana jobs you’ll see Techo-Bloc and Cambridge pavers on the hardscape side of an ADU patio or walkway, and Quikrete products specified for the post-tension slab repairs and flatwork that come with almost every addition here. When we need to match an existing paver or match a specific concrete finish on a Lantana home, we can pull local stock fast because we’re already working in the 76226 area weekly. Named brands mean you can look up exactly what we’re putting on your property before you sign anything.
Common Home Additions & ADU Problems We See in Lantana Homes
If your home in Lantana was built between 2003 and 2015, you’re now in the 15 to 20 year range where first-generation issues start showing up. Here’s what we see most on addition and ADU projects:
- Post-tension cable strikes during slab cutting. Lantana’s post-tension slabs are nearly universal across the build-out. Cutting or coring into a slab without a scan can sever a tensioned cable, and that means immediate structural cracking and a builder-warranty void that takes the whole project down. We scan first, every time.
- Stop-work orders for skipping the Lantana Architectural Review Committee. Some contractors pull county permits and figure the HOA won’t notice. Lantana’s ARC has a design review mandate and they do enforce it. A detached ADU that doesn’t match the approved exterior palette or setback lines gets stopped, and you’re the one who pays for the delay.
- Garage conversions that ignore the original subfloor. These 2000s-era garages weren’t insulated or moisture-sealed for living space. Convert one without addressing that and you get rot, mold, and a bathroom rough-in you can’t actually use.
- Clay-soil movement cracking new work. Blackland Prairie clay shrinks hard in summer and swells in spring. That continuous movement stresses slab edges, flatwork, and any ground-contact framing. An addition that isn’t engineered for that movement will crack within a couple of seasons.
Pricing for Home Additions & ADU in Lantana, TX
Here are the realistic ranges we quote for Lantana homeowners. These reflect the dual approval process, post-tension slab work, and the current cost of materials in Denton County.
| Project Type | Typical Lantana Range |
|---|---|
| Home Addition | $45,000-$130,000 |
| ADU Construction (Detached) | $90,000-$220,000 |
| Garage Conversion ADU | $30,000-$80,000 |
What moves the number on a Lantana job specifically? ARC-required exterior materials (a brick-veneer match to your original elevation costs more than fiber cement), the amount of slab scanning and any post-tension cable avoidance work, and how much of your existing utility trenching crosses the original builder’s engineering easements. We’ll hand you a written line-item estimate, not a handshake and a number. Call (877) 610-1318 for a free estimate, and you’ll get scope in writing, allowances in writing, and change orders in writing before any work proceeds.
Home Additions & ADU in Lantana: What Most Quotes Miss
Every exterior addition or ADU in Lantana must clear both the Lantana Architectural Review Committee and Denton County permitting before a single footing is poured. That’s a dual layer of design and code approval that neighboring Argyle and Bartonville properties, which fall under far more permissive county-only review, simply do not face. When a contractor gives you an addition quote without mentioning the ARC, that contractor hasn’t worked in Lantana. The ARC reviews exterior materials, rooflines, setbacks, and color palettes against the original development’s approved elevations. Denton County reviews structural, plumbing, electrical, and mechanical code compliance. We prepare both packages in parallel and we don’t pour until both clear. That’s the only way to avoid a stop-work order on a lot in the 76226 zip code.
We recently added a second-story primary suite on a post-tension slab home in the Lantana Estates neighborhood near the Bridlewood golf course. Before framing began, our crew scanned the slab for tensioned cables and mapped the existing load-bearing wall we removed. That scan saved the client from cutting a cable that would have voided the original builder’s engineering specs. The HOA’s Architectural Review Committee approved our revised roofline only after we matched the roof pitch and brick-veneer color to the original 2007 elevation, and the final inspection sign-off came through Denton County two weeks later. That’s the order of operations every Lantana addition should follow, and it’s the one we’ve been running since before most of these homes were even built.
We Also Serve Cities Near Lantana
Our crews live in the area and we’re on Home Additions & ADU in Lantana jobs most days of the week. If you’re in Flower Mound, Highland Village, Corinth, or Trophy Club, we run the same dual-permit and post-tension-slab playbook there, adjusted for each city’s specific requirements. Call us at (877) 610-1318 and we’ll tell you straight what your property will need.
Serving Lantana, TX - Our Local Coverage Area
We’re based in the Lantana 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 Lantana
Yes. A detached ADU in Lantana requires approval from the Lantana Architectural Review Committee for exterior design, materials, setbacks, and roofline, plus full Denton County building permits for structural, plumbing, electrical, and mechanical work. The two reviews happen in parallel but both must clear before any footing is poured. We prepare and submit both packages. Call (877) 610-1318 and we’ll give you the exact sequence for your lot.
You can, but only after a structural scan locates every tensioned cable. Cutting into a post-tension slab without a scan is how Lantana homeowners end up severing a cable, and that causes immediate structural cracking and voids the original builder’s engineering specs. We scan first, then plan the trench path around the cables, then cut. It’s non-negotiable on every Lantana job we run.
Yes. Denton County will review your addition against current adopted codes, not the 2008 code your home was originally built under. That means updated energy efficiency standards, current structural load requirements, and possibly upgraded electrical panel capacity. Your existing post-tension slab and original foundation engineering from 2008 will also come into play for any new footings or penetrations. Call (877) 610-1318 for a free assessment of what your specific addition triggers.
Plan on roughly four to eight weeks for the Lantana Architectural Review Committee to complete design review for a sunroom or enclosed patio, assuming your submittal matches the development’s approved exterior palette and roofline requirements on the first pass. Submittals that miss the mark get returned and resubmitted, which is why we match roof pitch and brick-veneer color to your original elevation before we submit. It saves you the resubmittal clock.
For most Lantana homeowners, a garage conversion is the faster and less expensive path if your goal is a rental unit or mother-in-law suite: $30,000 to $80,000 compared to $90,000 to $220,000 for a detached ADU. But a garage conversion still requires ARC review of the exterior change, and you’ll need to address the original garage subfloor and moisture barrier before it becomes living space. A detached ADU gives you more design freedom and doesn’t displace your parking, but it carries the full ARC design review and a longer Denton County permitting timeline. We’ll walk you through both options with real numbers for your specific lot.
Get Your Lantana Home Addition or ADU Started the Right Way
If you’re on the fence, start with a free estimate. We’ll come out, look at your slab, check your lot’s setback lines, tell you what the ARC will require, and hand you a written line-item quote with real numbers. No pressure. No phone-game pricing. Tom Barrett publishes his name, his address, and his license number, and his sons run the crews. Call (877) 610-1318 today to schedule your free estimate for a home addition or ADU in Lantana, TX.
Written by Tom Barrett, Owner at Barrett & Sons Construction, serving Lantana and the surrounding Denton County communities.