A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateFast, Reliable ADU Builders Across Colleyville
Adding an ADU on a Colleyville estate lot is a different animal than a standard backyard build. The city’s 1-acre minimum in many residential zones means most homeowners we talk to in Colleyville aren’t dealing with a tight squeeze between fence lines. They’re planning a 900 to 1,200 square foot detached suite with custom finishes that has to look like it grew out of the main house. We coordinate the whole thing: site plan, foundation on expansive clay, long-lead materials, HOA sign-off, and the build itself. If you’re just starting to think through what an ADU costs and what your lot can actually support, call (682) 204-9686 and we’ll walk you through it.
Why Benson ADU Fort Worth Is Colleyville’s Preferred ADU Builders Company
Colleyville homeowners tend to do their homework before they let anyone touch their property. That’s why we put every price in writing before the first order goes out. No verbal estimate that drifts. No scope creep billed after the fact. Our ADU Builders team has built and installed units across Colleyville, from detached guest quarters near Montclair Park to backing-studio ADUs off Cheek-Sparger Road. We know which lots trigger site plan review, which HOAs require design committee approval before you even file with the city, and which materials hold up through a North Texas August that doesn’t quit.
The other thing Colleyville homeowners notice: the same person answers the phone every time you call. No voicemail loop. No waiting until Monday. You get a live person, 24/7. Our crews arrive in uniform, background-checked, and you get before-and-after photos plus a digital invoice you can pay by link. That’s the Relay Visibility Guarantee, and it’s the same system we’ve used since the Relay Home Co. family started in 2006. Troy Eastman leads our team, and he signs off on every written price before it goes to a homeowner.
On the workmanship side, every project carries our 365-Day Done Right Promise. If something’s not right within a full year, we make it right. That’s in writing, stamped on your project file.
Backyard ADU in Colleyville
A backyard ADU in Colleyville is usually a fully detached unit, 650 to 1,200 square feet, built in the rear yard of an estate property that already measures an acre or more. The city’s zoning requires that minimum lot size in many residential districts, which is good news if your property qualifies: you’ve got the room for a real footprint, and you’re not shoehorning a studio behind a garage. What this job involves here is more than framing and drywall. It’s matching rooflines to your existing custom home, tying into the main sewer and electrical service, pouring a foundation that won’t crack when the clay soil does its seasonal thing, and getting the driveway approach through site plan review in a city that has no alleys in most neighborhoods. A high-end backyard ADU in Colleyville typically runs $180,000 to $320,000 depending on finish level, foundation type, and landscape restoration.
You need a backyard ADU in Colleyville when you’ve got aging parents who want to live close but not in the same house, adult kids who need a landing spot, or a rental income plan that works because of the city’s strong single-family home values. We also build them as dedicated offices and workout studios. The point is the same: it’s a separate structure that has to feel like part of the estate.
Detached ADU vs. Attached Addition
A detached ADU keeps its own foundation, its own roofline, and its own utility connections. That’s a bigger engineering job, especially on Colleyville soil. But it gives you genuine privacy and lets you rent it out without sharing a wall.
An attached addition or interior conversion can work in some Colleyville homes, but the city’s lot-width and setback constraints often make a rear-yard detached unit the cleaner path. We’ll tell you which one pencils out after we see your survey.
ADU Construction in Colleyville
ADU construction in Colleyville is a site-built process for most of our clients, not a prefab drop-in. That’s because the city’s design standards push for seamless integration with existing upscale homes. Brick or stone veneers, steeply pitched roofs, custom trim. You don’t want a box that looks shipped. You want a small house that looks like it was always there. A full site-built ADU construction project in Colleyville typically starts around $220,000 and runs upward from there; the finish package, not the framing, drives most of that number. Custom millwork, architectural glass, and specialty hardware are long-lead items, and we order them before demo because waiting until after framing means a four-month stall.
Colleyville homeowners call us when they want something beyond a standard layout: a full kitchen with stone counters, a living room with tall ceilings, a bath with curbless shower and tile to the ceiling. We coordinate with the architect or designer if there is one, or introduce you to people we work with regularly. Troy Eastman keeps the schedule honest, especially on the long-lead side.
Custom Millwork and Architectural Glass
This is where Colleyville ADU projects go from nice to estate-grade. Built-in wardrobes, floating shelves, coffered ceilings, window seats. We do the millwork in-house and match the species and stain to the main house. Architectural glass is a longer conversation: a 14-week lead time is routine for specialty glazing, so we order it early and lock pricing in writing with the supplier before we break ground.
Trusted Brands We Service in Colleyville
We’re authorized to build and install with a curated set of prefab lines: Cover, Dvele, and Mighty Buildings are the three we specify most for Colleyville lots. Each offers a different speed and finish level. Cover does panelized builds with a clean, modern envelope. Dvele leans into high-end prefab with healthy-home materials and strong passive design. Mighty Buildings uses a composite panel system that goes up fast and handles the humidity swings in North Texas without complaint. We stock connector parts and touch-up kits for these systems locally, and our team is trained directly on each manufacturer’s install sequence. If you’re weighing site-built against prefab, we’ll give you the honest trade-offs for a Colleyville lot, including foundation compatibility on clay soil.
Common ADU Builders Problems We See in Colleyville Homes
- Expansive clay soil cracking the slab. Colleyville sits on some of the most reactive clay in the metroplex. We see ADUs with hairline cracks after the first winter because the foundation wasn’t engineered for soil movement. We spec post-tension or pier-and-beam improvements accordingly, and we bring the geotech report into the pricing conversation before we quote.
- Long-lead materials blowing up the schedule. Custom cabinetry, architectural glass, and specialty hardware run 8 to 16 weeks in this market. Builders who order after framing leave the owner staring at a stalled shell. We order before demo and put the price in writing with the supplier.
- HOA driveway-approach rejections. Most Colleyville neighborhoods have no alleys, so a detached ADU needs a new curb cut or an extended driveway from the street. If the HOA or site plan review rejects the first location, you’re paying for a redesign. We come in during planning, not after the fact.
- Foundation mismatch between main house and ADU. On older Colleyville estates, the main house may sit on a slab built to one era’s code, while the ADU needs a different system for the same soil. We match the engineering to the actual lot conditions and the city’s current foundation requirements.
Pricing for ADU Builders in Colleyville, TX
A prefab studio ADU in Colleyville typically runs $95,000 to $140,000. A custom site-built one-bedroom ADU on a 1-acre lot usually lands between $220,000 and $320,000. A high-end detached suite with architectural glass, custom millwork, and James Hardie cladding matched to the main house can push $350,000 to $450,000. What moves the number: foundation method on clay soil, finish level, whether you need a new driveway approach, and how early we lock pricing on long-lead items. Call (682) 204-9686 for a written line-item quote. Estimates are free, and the price we write is the price you’ll pay.
We Also Serve Cities Near Colleyville
Our crews work in Bedford, Euless, Southlake, and Haltom City. Same written pricing, same 365-Day Done Right Promise. If you’re just outside Colleyville proper, call (682) 204-9686 and we’ll confirm coverage for your address.
Serving Colleyville, TX - Our Local Coverage Area
We’re based in the Colleyville 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 About ADU Builders in Colleyville
If your lot doesn’t meet the minimum lot size in your residential zone, a detached ADU is not on the table no matter how big your rear yard looks on the survey. That one-acre minimum in many Colleyville districts is the first thing we check. If it works, you have real room for a full unit. If it doesn’t, an attached addition or interior conversion may still be possible. Call (682) 204-9686 with your address and we’ll do a preliminary zoning check for free.
Custom cabinetry, architectural glass, and specialty hardware are the three we watch most closely. In this market, custom millwork runs 8 to 12 weeks, architectural glass often 12 to 16, and imported hardware can slide past that. We order before demo and lock supplier pricing in writing to protect you from mid-project increases. That’s baked into our process, not an add-on.
For a site-built ADU on Colleyville clay, we typically recommend a post-tension slab or pier-and-beam with deeper footings, depending on the geotech report. The goal is a foundation that moves with the soil without cracking your walls. We won’t quote a foundation until we’ve seen the soil boring data for your specific lot. Call (682) 204-9686 and we’ll explain what the report means for your price.
Most Colleyville neighborhoods don’t have alleys, so a detached ADU usually needs a new curb cut or an extended driveway from the street. That triggers site plan review and, in many subdivisions, HOA design committee approval before the city will even look at it. We handle the submittals and the revision loops, and we tell you early if your first-choice location is likely to get rejected so you’re not paying for a redesign. The goal is one clean approval, not three rounds.
Yes. We match rooflines, brick or stone veneer, siding profile, and trim details to your main house, including James Hardie cladding and color matching. On a recent estate project in the Montclair Park neighborhood, we matched the ADU’s James Hardie siding to the main house and used the same custom millwork profiles throughout. The result is a guest suite that reads as part of the original build. Call (682) 204-9686 and we’ll walk your property to show you exactly what matching looks like on your lot.
Get a Written Price Before You Commit
If you own a Colleyville property and you’re weighing an ADU, the first step is a real conversation about what your lot can support and what it costs. We’ll review your survey, check zoning, and give you a written line-item quote before any work starts. No verbal estimate that shifts. No surprise change orders. Call (682) 204-9686 to schedule your free estimate. Troy Eastman and our team handle everything from site plan to final walk-through, and every project carries the 365-Day Done Right Promise in writing.
Written by Troy Eastman, Owner at Benson ADU Fort Worth, serving Colleyville homeowners through the Relay Visibility Guarantee.
