Veteran-Owned · Connecticut Design-Build
Connecticut's Builder for Detached Garages, Barns & ADUs
From a single car-collector garage to a full equestrian barn or accessory dwelling, we design, permit, and build it start to finish — so you get the project done right, without the runaround.
Veteran-Owned
Licensed & Insured
15+ Years Experience
2-Year Warranty
Why Homeowners Choose Us
The contractor you hire when you want it done correctly
We're the team homeowners call when the project matters — premium craftsmanship, honest communication, transparent scope, and a finished building that adds lasting value to the property. Standardized where it saves money. Custom where it matters.
Thomas Construction is a full-service design-build contractor. That means one team owns your project from the first conversation to the final walkthrough: design, permitting, site work, foundation, framing, finishes, and every subcontractor in between. You always know who to call, and you never have to play general contractor on your own home.
Looking for a Garage? The Whole Project, One Contract
One garage. One company responsible for the entire project.
Most garage prices only tell you what the building costs. We can handle what it takes to actually build it — and we show you both numbers up front.
Design
Permitting
Site Work
Foundation
Construction
Utilities
Inspections
Final Walkthrough
Building an addition, barn, ADU or outdoor living space instead? Same process, same single point of contact — see everything we build.
A Simpler Way to Build
Start with a proven garage configuration.
Not every garage needs to begin with a blank sheet of paper. We've standardized our most popular garage sizes and specifications — simpler planning, faster estimating, and pricing you can actually compare — while every garage stays customizable to your home and property.
See garage models, options & turnkey project costs
Structure prices exclude foundation, site preparation and project services — we show those too, so you always know what you're comparing.
Need Something Beyond the Standard?
Custom structures, fully managed
Standard models are a starting point — custom is where we live. Eight specialties, one standard of craftsmanship, from collector garages to barns, ADUs and additions.
Detached Garages
Two-car to six-bay custom garages with lofts, workshops, and matching architecture.
Learn moreCar Collector Garages
Climate-controlled showrooms, lifts, epoxy floors, and storage built for serious collections.
Learn moreBarns
Equestrian, storage, and hobby barns engineered for Connecticut weather and built to last.
Learn morePost & Beam
Timber-frame craftsmanship with exposed beams and classic New England character.
Learn moreADUs & Apartments
Accessory dwelling units and garage apartments for guests, family, or rental income.
Learn moreHome Additions
In-law suites, primary suites, and bump-outs that blend seamlessly with your home.
Learn moreOutdoor Living
Covered porches, pavilions, pool houses, and outdoor kitchens for year-round enjoyment.
Learn moreSeptic & Foundation
Excavation, foundations, and septic coordination — the groundwork every project depends on.
Learn more
The Thomas Difference
Premium work without the stress
Most construction headaches come from poor communication and too many hands in the project. We built our company to remove both.
Veteran-owned discipline
Owner Zach Thomas Caldwell runs every project with the accountability and follow-through you'd expect from a veteran-led company.
One point of contact
No chasing subs or guessing who's responsible. You work directly with us from design through your final walkthrough.
We handle permitting
Zoning, setbacks, wetlands, building permits — we navigate your town's process so you don't have to.
Craftsmanship that lasts
Quality materials and proper detailing, engineered for Connecticut's frost, snow, and coastal wind loads.
Clear, honest communication
Straight answers about scope, timeline, and budget — before the work starts and at every milestone after.
2-year craftsmanship warranty
We stand behind our work long after the project wraps, on top of manufacturer warranties on materials.
How It Works
A clear, five-step process
You always know what's happening next. Here's how a Thomas Construction project moves from idea to finished building.
Consultation
We meet at your property, learn your goals, and talk through what's possible for your site and budget.
Design & Proposal
We develop your design and deliver a clear, detailed written proposal — no vague estimates or surprises.
Permitting & Planning
We handle drawings, zoning, and permits, and lock in the schedule before any ground is broken.
Construction
Our crew and trusted subs build to spec while we manage quality, timeline, and every detail on-site.
Final Walkthrough
We review the finished project together, address any details, and back it with our 2-year warranty.
15+
Years of experience
100s
Projects completed
2-Yr
Craftsmanship warranty
1
Point of contact
What Clients Say
Homeowners who trusted Thomas
★★★★★
"Zach was attentive to our wants and needs regarding the project we outlined. He then came back with his plan on how he envisioned the project to look like. Along the way the discussions were open and options were presented. We are very happy with our dealings with Zach (and his crew) from start to finish."Don & Cheryl Desautels
★★★★★
"They say that Rome was not built in a day — well, if Thomas Construction had been around back then, it would have been close. Professional and friendly, great people that you can count on."Richard & Margaret Emond
★★★★★
"Thomas excavated and repaired a leaking septic line, doing the work on short order, under quoted budget (which by the way was dramatically below two other quotes) and in an excellent manner. Great company to rely on."Alan Healey
All 5-star reviews from our Google Business profile.
Where We Build
Serving homeowners across Connecticut
From central and eastern Connecticut to the shoreline, Greater Hartford, and Fairfield County, we build throughout the state.
ColchesterGlastonburyFarmington
LymeOld LymeNiantic
MysticGrotonGreenwich
DarienStamfordLitchfield
Common Questions
Good to know before you build
We're based in Colchester and build throughout Connecticut — including Glastonbury, Farmington, the shoreline (Lyme, Old Lyme, Niantic, Mystic, Groton), and Fairfield County towns like Greenwich, Darien, and Stamford. See all service areas.
We're a full design-build contractor. We manage design, permitting, site work, foundations, construction, and every subcontractor — so you have one point of contact from start to finish.
Most detached garages range from about $100,000 to $250,000, with luxury or larger builds $250,000–$500,000+; car collector garages typically run $150,000–$750,000+. As a premium builder, most of our projects begin around $100,000. See our pricing guide — or compare standard sizes with transparent structure pricing on our Garage Models & Pricing page.
Yes — Thomas Construction LLC is a licensed Connecticut contractor (NHC.0017215), fully insured, and veteran-owned. Our work is backed by a 2-year craftsmanship warranty.
Projects typically finish consultation to completion in 8–16 weeks, depending on size and complexity. Design and permitting can take a few weeks to a few months depending on your town.
A free consultation at your property. We'll discuss your goals, look at your site, and outline what's possible. Request your consultation.
Start Your Project
Request a free consultation
Tell us about your project and we'll get back to you, usually within one business day, to schedule your on-site consultation.
- No-pressure, no-obligation conversation
- Honest input on scope, options, and budget
- One contact from design through completion
Thanks — your request has been received. We'll be in touch within one business day.