Fairfield County, CT · 39 Years of Trust

Home Additions & Basement Finishing
in Fairfield County, CT

Add square footage with a room addition or turn your unfinished basement into livable space. Additions from $40K, basements from $15K. Transparent pricing, permits handled.

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Part 1

Home Additions

Room additions that expand your footprint — bedroom, family room, larger additions with wet space. We handle structural engineering coordination, roofing tie-in, HVAC extension, permits, and inspections.

Larger Addition with Wet Space
$75,000 – $120,000
  • 300–400 sq ft new space
  • Plumbing rough-in & fixtures
  • Kitchen cabinetry & counters (if included)
  • Full electrical system extension
  • HVAC design & installation
  • 3–5 month timeline
Best for: additions that include a bathroom, kitchenette, or wet bar
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Second-Story or Complex Addition
$120,000 – $200,000+
  • Structural engineering & foundation review
  • Roof redesign & tie-in
  • Full code compliance review
  • Complete exterior & interior finish
  • 4–6 month build timeline
  • Custom quote required — each project unique
Best for: second-story additions, whole-floor expansions, complex structural projects
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Basement Finishing

Turn that unfinished concrete into real livable space — family room, playroom, guest area, or home gym. We handle waterproofing, framing, electrical, plumbing if needed, and CT egress window requirements.

Basic Basement Finish
$15,000 – $25,000
  • 400–500 sq ft finished space
  • Framing, insulation & drywall
  • Basic flooring (carpet or concrete paint)
  • Lighting throughout
  • Code-compliant electrical outlets
  • No bathroom or kitchen
Best for: playroom, storage upgrade, basic family room
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Finished Basement with Bathroom
$40,000 – $65,000
  • 500–800 sq ft with full bathroom
  • Quality finishes throughout
  • Bathroom plumbing & fixtures included
  • Waterproofing & moisture prevention
  • Egress window (code requirement for bedroom)
  • 2–3 month timeline
Best for: guest suite, in-law space, or finished living area with bathroom
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Real Project · Norwalk, CT

The Martinez Family Addition — $55,000 Total

Location: Norwalk, CT
Scope: 250 sq ft family room
Timeline: 4 months

Single-story family room addition — 2 large windows, glass door to patio, full HVAC extension, hardwood flooring, recessed lighting plus two ceiling fans. Walls tied to existing framing.

Foundation & framing$15,000
Roof tie-in & shingles$8,000
Doors, windows & exterior$7,000
Electrical & HVAC$10,000
Drywall, paint & flooring$8,000
Permits & inspections$2,000
Labor & overhead$5,000
Total$55,000
"Doubled our living space. The kids finally have room to play. Process was smooth. Steve communicated every step." — The Martinez Family, Norwalk, CT
Real Project · New Canaan, CT

The García Family Basement — $35,000 Total

Location: New Canaan, CT
Scope: 600 sq ft + half bath
Timeline: 8 weeks

Full basement framing and insulation, luxury vinyl plank flooring, light and airy drywall finish, recessed lighting throughout, bathroom with toilet/sink/shower, egress window for code compliance, waterproofing and drainage.

Framing & insulation$8,000
Electrical & HVAC rough-in$5,000
Plumbing & half-bath$5,000
Flooring & paint$6,000
Doors, windows & trim$3,000
Permits & inspection$1,500
Labor$6,500
Total$35,000
"Gave us a guest space and playroom for the kids. The bathroom is perfect. Dry and comfortable. Best investment we've made in the house." — The García Family, New Canaan, CT

Addition Contractor Serving Fairfield County, CT

We've been building additions and finishing basements across Fairfield County for 39 years. We know local zoning setback requirements, permitting timelines for each town, and what families in Stamford, Norwalk, and Greenwich actually need. One contractor, from permits to final walk-through.

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Common Questions

Addition & Basement FAQs

How much does a home addition cost in Fairfield County, CT?
Single-story bedroom or family room additions in Stamford, Norwalk, or Greenwich typically run $40,000–$75,000. Additions with plumbing (bathroom or kitchenette) run $75,000–$120,000. Fairfield County prices run 5–10% higher than CT state average due to labor, permits, and coastal demand. For a full breakdown by addition type, see our 2026 home addition cost guide for CT.
How long does a home addition take in Connecticut?
A 200–300 sq ft single-story addition typically takes 2–4 months from permits to final inspection. Larger additions with plumbing or second-story work run 3–6 months. Permit approval in Fairfield County towns typically takes 3–6 weeks — we factor this into your timeline upfront.
What does basement finishing cost in Norwalk or Stamford, CT?
A basic finished basement in Norwalk or Stamford runs $20,000–$35,000. Adding a bathroom pushes it to $40,000–$65,000. For a full breakdown by finish tier, cost drivers, and permit requirements, see our 2026 basement finishing cost guide for CT.
Do basements in Connecticut need waterproofing?
Usually yes. Older CT homes — especially in coastal Fairfield County — often need drainage improvements or exterior waterproofing before finishing. We inspect for moisture before framing and tell you exactly what's needed. Waterproofing is included in our high-end basement tier and quoted separately for others.
Do you handle permits for additions and basements?
Yes. We pull every permit, coordinate with town inspectors, and get final sign-off. Fairfield County towns each have their own requirements — we've navigated all of them for 39 years. You don't make a single call to the building department.

Ready to Add Space to Your Home?

Free consultation. We visit your home, assess the scope, and give you a realistic cost range — no commitment required.

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