🏠How Much Does It Cost to Finish a Basement in Massachusetts? (2025 Guide)
- Timothy McNamara
- Oct 21
- 3 min read
Finishing your basement is one of the most cost-effective ways to add living space and long-term value to your home. Whether you’re planning a cozy family room, home gym, or guest suite, understanding the cost helps you plan with confidence.
At McNamara Contracting, we specialize in thoughtful, durable remodels that enhance comfort and efficiency for Massachusetts homeowners. Here’s what to expect when finishing about 800 sq. ft. basement in 2025.
💰 Average Basement Finishing Cost in Massachusetts
For an 800 sq. ft. basement with 8-foot ceilings, most homeowners spend between $60,000 and $140,000 depending on design, finishes, and existing conditions.
Basic Finish (LVP, no bathroom): $60,000 – $85,000
Midrange Finish (bathroom + mini-split): $85,000 – $105,000
High-End Finish (engineered flooring, egress, custom trim): $105,000 – $140,000+
That translates to about $75–$140 per square foot, which is consistent with Massachusetts labor and material costs in 2025.
🧱 Basement Finish Cost Breakdown (800 sq. ft.)
Category | Low Range | High Range | Details |
Framing | $8,000 | $12,000 | Includes walls, soffits, closets, and partitions. |
Insulation | $6,000 | $12,000 | Mineral wool or fiberglass; closed-cell foam can double cost. |
Drywall & Plaster | $7,000 | $9,000 | Includes hanging, finishing, and labor. |
Painting | $4,000 | $6,000 | Two coats on walls, ceiling, and trim. |
Electrical | $8,000 | $12,000 | New circuits, outlets, and recessed lighting. |
Subpanel (if needed) | $1,500 | $2,500 | Optional upgrade for additional circuit capacity. |
Flooring (choose one) | — | — | — |
• Luxury Vinyl Plank (LVP) | $4,000 | $6,400 | Moisture-resistant, durable, affordable. |
• Engineered Hardwood (upgrade) | $14,000 | $20,000 | Premium look and feel; higher maintenance. |
Trim & Finish Carpentry | $6,000 | $9,000 | Includes trim, doors, and basic interior partitions. |
Stair Finishing | $3,000 | $5,000 | Matching treads, risers, and skirt boards. |
Mini-Split System | $9,000 | $16,000 | Heating and cooling; single or multi-zone system. |
Bathroom (existing plumbing) | $8,000 | $10,000 | Half bath with rough-ins already installed. |
Bathroom (new plumbing or macerator) | $12,000 | $15,000 | Includes concrete removal and new drain setup. |
Waterproofing (basic Drylok) | $1,000 | $2,500 | Standard moisture protection. |
Waterproofing (active system) | $5,000 | $20,000 | French drain, sump pump, or vapor barrier. |
Egress Window | $6,000 | $12,000 | Adds safety and natural light. |
Custom Additions | $5,000 | $15,000 | Bar, entertainment area, or built-ins. |
🧩 What Affects the Cost of a Basement Remodel?
1. Moisture & Waterproofing
Even a dry basement benefits from a moisture barrier or Drylok coating. More extensive waterproofing, like a sump pump or drainage system, can add $5,000–$20,000 depending on foundation conditions.
2. Utilities & Soffit Layout
Moving plumbing, gas lines, ductwork, or electrical lines for a cleaner ceiling layout adds framing and labor costs but makes the space feel more open and finished.
3. Heating & Cooling
A mini-split system offers efficient year-round comfort. A single-zone unit might cost around $9,000, while multi-zone systems can reach $16,000.
4. Flooring Selection
LVP is the most popular choice for basements. Affordable, durable, and moisture resistant. Engineered hardwood adds warmth and a premium look but comes at a higher cost.
5. Trim & Interior Doors
Well-finished trim and doors define the quality of your basement. We include closet doors, utility room separation, and baseboards in our trim carpentry estimate.
📈 The Value of a Finished Basement
Finishing your basement is one of the highest-ROI home projects. Homeowners typically recoup 50–70% of the cost through increased home value while gaining a comfortable, versatile new space for daily use.
Unlike an addition, a basement remodel doesn’t expand your footprint, which makes it one of the most efficient ways to grow your living space.
🧰 Why Work With McNamara Contracting?
At McNamara Contracting, we’re known for high-quality craftsmanship, simple and durable building methods, and energy-efficient design. We build with care and practicality, ensuring your finished basement feels like an extension of your home, not a damp dusty basement.
✅ Ready to Start Your Basement Project?
If you’re considering finishing your basement, we’d love to help you plan and price your project. Contact McNamara Contracting today to request a consultation or get a detailed estimate for your home.