Unfinished basement. Finished living space.
Convert your unfinished basement into a family room, in-law suite, home theater, gym, or income-producing accessory dwelling unit. Fully waterproofed, insulated, and code-compliant.
Add the square footage that's already there.
You're paying for that basement square footage in your taxes whether you use it or not. A finished basement is the cheapest way to add usable living space to your home — usually 40-60% less per square foot than a bump-out addition.
Done right, a finished basement passes inspection, holds value, and stays dry through Connecticut winters. Done wrong, it grows mold and fails inspections. We do it right.
- Full waterproofing assessment and remediation
- Insulation, framing, and drywall to current CT code
- Egress windows for legal bedroom or apartment use
- Full bathroom additions with proper drainage
- Electrical sub-panel and HVAC zone extension
- In-law suite and ADU conversions (CT 2026 ADU rules)
Recent Connecticut projects.
Book a free, no-pressure quote.
Pick a time that works for you. Scott or one of our project leads will visit your home, walk the project with you, and follow up with a clear written estimate — usually within 5 business days.
- On-site consultation, no obligation
- Line-itemized written estimate
- Real timelines and a real start date
- CT Licensed & Insured (Reg. #NHC-0016939)
Prefer to call? Reach Scott directly at (860) 933-2700
Common questions.
How much does it cost to finish a basement in Connecticut?
Standard basement finishing runs $30,000 to $70,000 for a typical 1,000 sq ft area. Adding a full bath and bedroom runs $55,000 to $95,000. ADU conversions with full kitchen, bath, and separate entrance range $80,000 to $150,000+.
Do I need permits to finish my basement?
Yes. Basement finishing requires a building permit, electrical permit, and (if adding a bath) a plumbing permit in Connecticut. Egress windows are required for any room used as a sleeping area.
What about waterproofing?
Every basement we finish gets a moisture and waterproofing assessment first. We address any active leaks, install vapor barriers, and recommend a dehumidifier setup before framing begins.
Can my basement be used as a legal apartment?
In some Connecticut towns, yes — under the new 2026 ADU rules. Requirements include egress windows, a separate entrance, full bath, kitchen, and proper ceiling heights. We assess feasibility during your initial consultation.
Hartford & Tolland Counties
Based in Andover, CT — building, remodeling, and adding on to homes across central and eastern Connecticut for over two decades.
Ready to put your basement square footage to work?
Whether it's a kitchen refresh, a major addition, or a brand new home — we'll bring the same craftsmanship to your project that we'd bring to ours.
CALL DIRECT(860) 933-2700
Frequently Asked Questions
How much does it cost to finish a basement in Connecticut?
Basement finishing in Connecticut typically costs $30–$75 per square foot depending on whether you’re adding a bathroom, kitchenette, or converting to a full ADU. A standard finished basement runs $40,000–$80,000; a full basement ADU conversion runs $80,000–$150,000+.
Can I legally convert my basement into an ADU (accessory dwelling unit) in CT?
Yes — Connecticut state law (PA 21-29) requires most municipalities to allow ADUs by right, including basement conversions, as long as the space meets egress, ceiling height, and building code requirements. We handle all code compliance and permitting.
What’s required for a basement to become a legal ADU?
A basement ADU typically needs a compliant egress window or door, adequate ceiling height (usually 7 feet), proper insulation, a separate entrance in most cases, and full electrical/plumbing to code. We evaluate your basement’s eligibility during a free consultation.
How long does a basement finishing or ADU conversion take?
A standard basement finish takes 6–10 weeks; a full ADU conversion with a kitchenette and bathroom typically takes 3–4 months including permitting.
Can I rent out a finished basement ADU in Connecticut?
Yes, as long as it’s built to code and issued a Certificate of Occupancy. We build every basement ADU to full compliance so you can legally rent it once complete.
Related Basement & ADU Services
- Basement Finishing — Tolland County, CT — Local basement finishing services
- ADU Builder Connecticut — Statewide accessory dwelling unit services
- Whole-Home Renovation in Connecticut — Full-house renovation projects
- Home Additions in Connecticut — Home addition services and overview