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 Greenville
Adding square footage or building a detached ADU in Greenville means dealing with the Blackland Prairie first. The Vertisol clay under this city shrinks and heaves with every dry spell and downpour, and a foundation decision made without that in mind turns into stair-step cracks a couple of wet-dry cycles later. Barrett & Sons Construction has been building additions and ADUs on this soil since 1998. Tom Barrett and his sons run the crews, every permit gets pulled, and every price change lands in writing before a single stud goes up. Call (877) 610-1318 for a free estimate.
Why Barrett & Sons Construction Is Greenville’s Preferred Home Additions & ADU Company
We’re not a franchise dispatching strangers from two states away. Tom Barrett publishes his name, address, and license number, and his sons are on job sites in Greenville most days. Homeowners in 75401 and 75402 have called us after a national outfit quoted one number on the phone and showed up with another bill at the door. That doesn’t happen with us because every scope, every allowance, every change order is written and signed before work proceeds.
We know how the soil behaves on the west side where the 2000s-era post-tension slabs sit, and we know what a 1920s pier-and-beam near the historic downtown has been through. That local knowledge changes the way we scope foundation corrections, drainage, and beam packages. And every job we finish in Greenville carries our 90-Day Done Right Promise in writing. If it’s not right, Tom comes back. One call.
Our Home Additions & ADU team manages the full permit process, coordinates inspections, and keeps neighbors informed on tight lots. A live person answers our phone 24/7, not a voicemail box.
Our Home Additions & ADU Services in Greenville
New Detached ADU
A new detached ADU in Greenville almost always starts with a foundation conversation. On 75402 west-side lots, the post-tension slabs need proper grading and drainage before you pour an ADU pad nearby. On older lots, we’re often drilling deep piers through clay that’s shifted for sixty years. Our crews handle site prep, utilities, framing, and finishes, and we pull permits on every eligible job.
Second Story Additions
Adding up instead of out makes sense on Greenville’s tight historic-district lots where there’s no side yard to give up. But a second story adds load to a foundation that may have settled unevenly. We assess what the existing structure can carry and scope any beam package or foundation correction into the written change order before framing begins. We also handle party-wall notices when the lot line is shared.
ADU Site Prep & Utilities
Greenville’s clay doesn’t forgive shortcuts on grading, trenching, or conduit placement. We grade for positive drainage away from both the main house and the new ADU, install or extend water, sewer, and electric, and schedule inspections so the work doesn’t stall behind a missed signature.
Garage Conversion ADU
Converting an attached or detached garage into living space is often the most affordable way to add a rental unit or in-law suite in Greenville. The catch here is what the garage slab has been doing. Improper grading or gutterless additions on 75402 lots direct water against the foundation, and the clay memory shows up as stair-step brick cracks. We evaluate the slab, fix drainage, and scope the conversion so the finished space stays sound.
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 Greenville
We carry materials you can look up, not mystery brands off a van. For hardscape and site work around Greenville ADUs and additions, we regularly use Techo-Bloc and Cambridge Pavers for patios, walkways, and retaining details, and Quikrete for engineered concrete mixes suited to this clay. Having access to local supply yards in the Greenville area means we can get materials on site without waiting on a Dallas backorder.
Common Home Additions & ADU Problems We See in Greenville Homes
- Expansive clay under new ADU slabs. Without deep piers or proper engineered support, a detached ADU on Greenville’s west-side clay can crack within the first two wet-dry cycles. The pattern shows up fast and it’s expensive to fix.
- Historic-district lot constraints near downtown 75401. Tight yards force staging onto the street or a neighbor’s side yard. Without pre-approval, that triggers code complaints and stop-work orders.
- Skipped party-wall notices on shared-lot second stories. Greenville requires notice for work on a shared line. Skipping it can halt the job and invalidate the permit when the neighbor objects during inspection.
- Foundation movement on older pier-and-beam homes. Decades of clay movement means the floor isn’t level and the corners aren’t square. We scope the correction into the change order before framing, not after discovery.
Pricing for Home Additions & ADU in Greenville, TX
A home addition in Greenville typically runs $45,000-$130,000, an ADU construction $90,000-$220,000, and a garage conversion ADU $30,000-$80,000. What moves the number most on this soil is foundation scope, site access, and utility runs. A tight 75401 lot with no street staging costs more to build on than an open 75403 yard. Here’s the honest, line-item picture:
| Project Type | Typical Greenville Price Range |
|---|---|
| Home Addition | $45,000-$130,000 |
| ADU Construction | $90,000-$220,000 |
| Garage Conversion ADU | $30,000-$80,000 |
We write every scope, allowance, and change order on paper before work starts. No surprise invoices at the end. Call (877) 610-1318 for a free estimate with real numbers, not a phone quote that changes at the door.
We Also Serve Cities Near Greenville
In addition to our work across Greenville, Barrett & Sons serves Royse City, Fate, Princeton, and Rockwall. If you’re anywhere in Hunt County or the surrounding corridor along I-30, call (877) 610-1318 and ask for Tom or one of his sons. We’ll come out, look at the soil and the lot, and write a real estimate.
Serving Greenville, TX - Our Local Coverage Area
We’re based in the Greenville 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 Greenville
It can raise the foundation portion of an ADU build substantially. On 75402 west-side post-tension slabs, we often need to correct existing drainage first. On older lots, we’re drilling deep piers through expansive Vertisol clay. That work can add $10,000-$30,000 depending on lot conditions. Call (877) 610-1318 for an exact quote. Estimates are free.
Yes. If the addition touches or is built along a shared property line, Greenville requires written notice to the neighbor before work begins. Skipping it can trigger a forced halt and invalidate the permit if the neighbor objects during inspection. We handle the notice as part of our permitting package, and we talk to your neighbor before the first beam goes up.
Because water has been directed against the foundation. On Greenville’s west side, many 2000s-era post-tension subdivisions have improper grading or gutterless additions that send rainwater to the slab edge. The clay swells, the slab moves, and the crack pattern appears. We fix the drainage first, then evaluate the structure. A conversion built on a cracked slab without that correction will fail again.
Greenville enforces a 7 a.m. to 7 p.m. work window for construction noise. On a tight 75401 lot, that means we plan noisy work like concrete cutting and framing within the window and reserve quiet tasks like layout and cleanup for the edges. It can add a day or two to the schedule, but it keeps the neighbors off the phone and the job out of code complaints.
It’s real. Historic overlay review adds a layer of design review before you get to building permits. The city wants to see that the addition fits the character of the existing structure. We prepare the submittal, file for review, and carry the project through inspections. Expect a few extra weeks on the front end, not a stop-work surprise in the middle. Call (877) 610-1318 for an exact quote and timeline.
Written by Tom Barrett, Owner at Barrett & Sons Construction, serving Greenville since 1998.