ADU Builder | Windham County, CT | Accessory Dwelling Units

ADU Builder | Windham County, CT | Accessory Dwelling Units

Lagace Construction serves all of Windham County — Connecticut’s Quiet Corner — for ADU design and construction. From the urban neighborhoods of Willimantic to the upscale rural estates of Woodstock and Pomfret, we bring 25+ years of New England residential construction experience to every ADU project we undertake in northeastern Connecticut.

Windham County is characterized by large rural lots, older New England housing stock, and a mix of former mill towns and agricultural communities — each presenting distinct ADU opportunities. Many Windham County properties have existing barns, garages, or outbuildings that can be converted into legal ADU structures, and the generous lot sizes throughout the county make new detached construction straightforward where local zoning permits.

Why Windham County Homeowners Are Building ADUs

Windham County faces a significant affordable housing shortage and has a strong culture of multigenerational family living. ADUs are one of the most practical tools for addressing both — letting homeowners house relatives privately on their own property while potentially generating rental income to offset housing costs.

  • House aging parents without relocating to a facility
  • Generate rental income — $900–$1,800/month depending on location and finish
  • Add $80,000–$200,000+ to your home’s market value
  • Create a caregiver unit, home office, or artist studio

Windham County Towns We Serve — ADU Pages

ADU Types We Build in Windham County

  • Detached ADU / Backyard Cottage — The most popular type in rural Windham County, where large lots make standalone structures feasible and practical
  • Barn & Outbuilding Conversion ADU — Many Windham County properties have existing agricultural structures that can become legal dwelling units
  • Basement ADU Conversion — Ideal for older farmhouses and colonials with full, unfinished basements
  • Attached In-Law Suite Addition — A connected ground-floor suite with private entrance, bath, and kitchenette
  • Garage Conversion ADU — Convert a detached or attached garage into a finished living unit

Connecticut ADU Law — What Windham County Homeowners Need to Know

Connecticut Public Act 21-29 requires every municipality statewide to allow at least one ADU per single-family residential parcel by right — that includes every town in Windham County. You don’t need a variance or special exception, just a standard building permit.

  • ADU can be up to 30% of the primary home’s square footage or 1,000 sq ft — whichever is smaller
  • Owner-occupancy is required
  • Local setbacks and coverage limits still apply per town zoning
  • Lagace Construction handles the entire permit process start to finish

How Much Does an ADU Cost in Windham County?

  • Basement ADU conversion: $60,000–$120,000
  • Attached addition ADU: $130,000–$220,000
  • Detached backyard ADU: $150,000–$280,000
  • Barn/outbuilding conversion: $70,000–$160,000 depending on existing structure condition
  • Garage conversion: $50,000–$100,000

Free on-site estimate with real line-item numbers. Call (860) 933-2700 or request an estimate online.

Why Windham County Homeowners Choose Lagace Construction

  • CT Licensed & Insured — NHC #NHC-0016939, Electrical #E1-00191661
  • 25+ years of residential construction in eastern CT including Windham County
  • 4.9 stars on Google — 40+ verified reviews
  • We pull all permits and manage all town inspections — including rural towns with part-time building departments
  • In-house carpentry crew — not a general contractor who subs out every trade
  • Honest written estimates with real timelines before anything is signed

Frequently Asked Questions — ADU in Windham County

Do small Windham County towns allow ADUs?

Yes — all of them. CT Public Act 21-29 applies to every municipality statewide, including small towns like Chaplin, Scotland, and Eastford. They must allow ADUs by right on residential lots. Permit timelines in small towns can vary — Lagace helps navigate that process.

Can I convert a barn or outbuilding into an ADU in Windham County?

In many cases, yes — subject to building code compliance (egress, insulation, electrical, plumbing). We assess existing structures for conversion viability as part of our ADU feasibility consultation.

Can I rent out an ADU in Windham County?

Yes, as a long-term rental with owner-occupancy on the primary home. Check with your town’s zoning office for short-term rental rules before listing on Airbnb or VRBO.

How do I start an ADU project in a rural Windham County town?

The process is the same as any CT town — start with our $175 feasibility consultation, where we assess your property, review local zoning rules, and give you a clear picture of what’s possible. From there, we prepare plans, pull permits, and build.

Start Your Windham County ADU Project

Call Scott at (860) 933-2700 or book a $175 ADU feasibility consultation. We serve the entire Quiet Corner and know Windham County zoning and housing stock well.

Lagace Construction LLC
CT Licensed & Insured | ADU Builder serving Windham County, CT
(860) 933-2700 | lagaceconstruction.com
Author of The ADU Playbook — available on Amazon