ADU Builder | Hartford County, CT | Accessory Dwelling Units

ADU Builder | Hartford County, CT | Accessory Dwelling Units

Lagace Construction builds ADUs throughout Hartford County — from the dense inner suburbs of West Hartford and Manchester to the upscale Farmington Valley communities of Avon, Simsbury, and Canton. With 25+ years of residential construction experience in Connecticut, we handle every phase: design consultation, permits, engineering, construction, and final occupancy inspection.

Hartford County is Connecticut’s most populous county and one of its most diverse in terms of housing stock and lot size. You’ll find compact urban neighborhoods in Manchester and East Hartford, affluent estate properties in Farmington and Glastonbury, and agricultural heritage lots in East Windsor and South Windsor — each presenting different ADU opportunities. We’ll help you identify the right type for your specific property.

Why Hartford County Homeowners Are Building ADUs

Hartford County’s housing costs have risen sharply, and ADUs offer one of the most practical solutions for homeowners dealing with multigenerational housing needs, rising care costs for aging parents, or the desire to generate rental income on an existing property.

  • House aging parents in a connected, private suite — not a facility
  • Generate $1,500–$2,500/month in legal rental income
  • Add $80,000–$200,000+ to your home’s resale value
  • Create a home office, in-law suite, or caregiver unit

Hartford County Towns We Serve — ADU Pages

ADU Types We Build in Hartford County

  • Basement ADU Conversion — Most popular in compact suburban towns like Manchester, East Hartford, Rocky Hill, and West Hartford where smaller lots limit detached options
  • Attached In-Law Suite Addition — A ground-floor addition with private entrance, full bath, and kitchenette — works on virtually any lot size
  • Detached ADU / Backyard Cottage — Ideal for larger lots in Avon, Simsbury, Glastonbury, Farmington, East Windsor, and South Windsor
  • Garage Conversion ADU — Convert an existing attached or detached garage into a finished living unit
  • Second-Story Addition ADU — Add a full dwelling unit above an existing garage or single-story wing

Connecticut ADU Law — What Hartford County Homeowners Need to Know

Connecticut Public Act 21-29 requires all municipalities statewide — including every Hartford County town — to allow at least one ADU per residential parcel by right. No variance needed. No special exception. Just a building permit from your local building department.

  • ADU limited to 30% of primary home’s square footage or 1,000 sq ft — whichever is smaller
  • Owner-occupancy required
  • Local setbacks and lot coverage limits still apply
  • Lagace Construction pulls all permits and manages all inspections

How Much Does an ADU Cost in Hartford County?

  • Basement ADU conversion: $60,000–$120,000
  • Attached addition ADU: $130,000–$220,000
  • Detached backyard ADU: $150,000–$280,000
  • Garage conversion: $50,000–$100,000

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

Why Hartford County Homeowners Choose Lagace Construction

  • CT Licensed & Insured — NHC #NHC-0016939, Electrical #E1-00191661
  • 25+ years of residential construction in Hartford County and eastern CT
  • 4.9 stars on Google — 40+ verified reviews
  • We pull all permits, manage all inspections, coordinate all trades
  • In-house carpentry crew — not a general who subs everything out
  • Written estimates with real timelines before you sign anything

Frequently Asked Questions — ADU in Hartford County

Do all Hartford County towns allow ADUs?

Yes — Connecticut Public Act 21-29 requires every municipality statewide to allow ADUs by right on single-family residential lots. All Hartford County towns must issue building permits for qualifying ADU projects.

Can I rent an ADU in Hartford County?

Yes, as a long-term rental — with owner-occupancy on the primary residence. Short-term rental rules vary by town; check with your local zoning office before listing on Airbnb or VRBO.

How long does ADU permitting take in Hartford County?

Building permit timelines vary by town — typically 4–10 weeks. We prepare complete permit packages, including engineering drawings, to avoid back-and-forth delays.

What’s the best ADU type for a small lot in Hartford County?

For lots under half an acre — common in Manchester, East Hartford, and West Hartford — a basement ADU conversion or attached in-law suite addition is typically the most cost-effective and zoning-compliant approach.

Start Your Hartford County ADU Project

Call Scott at (860) 933-2700 or book a $175 ADU feasibility consultation. We’ll visit your property, assess your options, and give you a clear plan. No obligation.

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