What Does It Cost to Build or Renovate in Boston?

Real-World Numbers for Triple-Decker Renovations and New Multi-Family Construction

Boston’s real estate landscape is unique — from historic triple-deckers to tight urban lots zoned for 3-family buildings. As experienced general contractors and developers, we know that one of the first questions homeowners and investors have is:

“How much will it cost?”

While pricing can shift based on interest rates, material availability, architectural details, and permitting timelines, we’ve outlined two of our most common project types below with real-world examples and ballpark budgets to help you understand what to expect.

Example 1: Full Gut Renovation of an Existing Triple-Decker

This type of project is extremely popular across neighborhoods like South Boston, Dorchester, Jamaica Plain, and East Boston, where homeowners or investors aim to completely modernize an older 3-family property while preserving its structural shell.

Project Scope Includes:

• Complete interior demolition down to studs

• New layouts for each floor

• New mechanical systems: plumbing, HVAC, electrical

• New insulation, drywall, flooring, doors, windows, trim, and finishes

• Kitchens, bathrooms, tile, cabinetry

• Fire alarm systems and code upgrades

• Exterior siding, porches, roof, and landscaping as needed

• Permitting and inspection management

Typical Cost Range:
$225 – $300 per gross square foot
For a standard 3-family gut renovation, total costs often range from $750,000 to $1,000,000+, depending on size, finishes, and any structural repairs needed.

Common Upgrades That Add to the Budget:

• Luxury kitchens or bathrooms

• High-end flooring or millwork

• Adding a roof deck

• Replacing older foundations or structural beams

If you’re looking for one of the best general contractors in Boston for full gut renovations, Abacus has deep experience with triple decker remodeling — modernizing century-old buildings with all-new interiors while managing code compliance, inspections, and historical details.

Example 2: Ground-Up New Construction – 3-Family Building

We also frequently build new 3-family buildings from the ground up on vacant lots or tear-down properties, especially in South Boston, Dorchester, and Roxbury. These projects are typically investment-driven and require seamless planning, permitting, and execution.

Project Scope Includes:

• Site prep, excavation, and foundation work

• Full structural framing (stick or panelized)

• Roofing, windows, doors, insulation

• Electrical, plumbing, fire alarm, and HVAC systems

• Drywall, flooring, kitchens, baths, and finishes

• Fire-rated stairwells and required sprinklers

• Permitting, inspections, and Certificate of Occupancy

Typical Cost Range:
$275 – $325 per square foot
For a typical 3-family of 4,500–5,500 square feet, expect total construction costs from $1.1M to $1.6M, not including land acquisition.

Factors That Impact Cost:

• Soil conditions and foundation complexity

• Fire code and egress requirements

• Structural steel or podium parking

• Premium design features or rooftop amenities

SEO-Boosted Description Example:
Abacus Builders is known as one of the top general contractors in Boston for new multi-family construction, offering fully managed design-build services for investors, developers, and homeowners who want to create long-term value.

Important Note on Pricing

Due to ongoing shifts in material prices, labor markets, and financing costs, all pricing listed above is approximate. Final estimates are created based on site visits, drawings, and detailed scopes of work.

Let’s Talk About Your Project

Whether you’re planning to gut-renovate a triple-decker in Dorchester or break ground on a new 3-family in Southie, the team at Abacus Builders is ready to help you evaluate the process and costs with transparency and care.

Request a Free Consultation Today →