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How much does a home addition or renovation cost on the South Shore?
Planning a home addition or renovation is exciting, but one of the first questions homeowners ask is: How much will it cost?
The answer depends on the size of the addition or renovation, the existing space being remodeled, the level of finishes, structural requirements, site conditions, and whether plumbing, HVAC, electrical, or zoning approvals are involved.
At WC Builders, we help homeowners understand realistic budget ranges early in the process so they can make informed decisions before committing to plans, selections, and construction.
Below is a general pricing guide for common home addition and renovation projects on the South Shore of Massachusetts.
COST GUIDE FOR HOME RENOVATIONS AND ADDITIONS
KITCHEN RENOVATION
A full kitchen renovation can include new cabinetry, countertops, appliances, plumbing fixtures, lighting, flooring, tile, trim, paint, and layout changes. Some kitchen projects stay within the existing footprint, while others involve removing walls, changing openings, or expanding the space.
Typical Project Range:
$80,000 to $150,000+
Larger kitchen renovations or kitchen expansions:
$150,000 to $350,000+
Cost Per Square Foot:
Existing kitchen remodel: $550 to $1,000 per sq. ft.
New kitchen expansion space: $750 to $1,250 per sq. ft.
Kitchen renovations are typically more expensive per square foot because they involve cabinetry, countertops, appliances, electrical, plumbing, lighting, flooring, tile, and detailed finish work.
KITCHEN EXPANSION
A kitchen expansion involves adding new square footage to enlarge the kitchen, improve flow, create more storage, add an island, or connect the kitchen to surrounding living areas.
Typical Scope:
New square footage added: 60 to 120 sq. ft.
Existing kitchen space remodeled: 100 to 200 sq. ft.
Cost Per Square Foot:
New kitchen space: $750 to $1,250 per sq. ft.
Existing kitchen remodel: $550 to $1,000 per sq. ft.
Estimated Project Cost:
$100,000 to $350,000
BATHROOM RENOVATION
Bathroom renovations can range from a clean refresh to a full gut remodel with custom tile, new plumbing fixtures, updated electrical, heated floors, custom glass, and improved ventilation.
Hall Bathroom Renovation:
$25,000 to $45,000+
Primary Bathroom Renovation:
$40,000 to $75,000+
High-End or Custom Bathroom Renovation:
$75,000+
Cost depends on the size of the bathroom, tile selections, plumbing changes, shower layout, vanity choice, glass enclosure, ventilation, and whether the space is being reconfigured.
HOME ADDITION
A home addition adds new square footage to your existing home. Additions may include family rooms, mudrooms, kitchen expansions, bedrooms, bathrooms, offices, or multi-room layouts.
Typical Project Range:
$150,000 to $500,000+
Cost Per Square Foot:
New living space: $385 to $500 per sq. ft.
Existing remodeled space: $175 to $275 per sq. ft.
Additions often involve foundation work, framing, roofing, siding, windows, insulation, electrical, HVAC, drywall, flooring, trim, paint, and tie-ins to the existing home.
PRIMARY SUITE ADDITION
A primary suite addition typically includes a bedroom, ensuite bathroom, closets, and sometimes a sitting area, laundry area, or custom storage.
Typical Scope:
New square footage added: 375 to 600 sq. ft.
Existing space remodeled: 35 to 150 sq. ft.
Cost Per Square Foot:
New bedroom/living space: $385 to $500 per sq. ft.
Existing bedroom/living space remodel: $175 to $275 per sq. ft.
Estimated Project Cost:
$150,500 to $341,250
Primary suite additions can vary significantly depending on bathroom size, tile selections, closet design, HVAC needs, structural work, and how the new space connects to the existing home.
TWO-STORY ADDITION
A two-story addition is a great way to add significant square footage while preserving yard space. These projects may include a family room, kitchen expansion, mudroom, bedroom, bathroom, or primary suite.
Typical Scope:
New square footage added: 995 sq. ft.
Existing space remodeled: 300 sq. ft.
Cost Per Square Foot:
New living space: $385 to $500 per sq. ft.
Existing remodeled space: $175 to $275 per sq. ft.
Estimated Project Cost:
$435,575 to $580,000
Two-story additions require detailed planning and may include foundation work, framing, roofing, siding, stair layout, structural engineering, HVAC, electrical, plumbing, and finish work.
ADU OR IN-LAW SUITE
An ADU, in-law suite, or guest suite can create flexible living space for family, aging parents, guests, or rental income where allowed by local zoning.
These projects may include a bedroom, bathroom, living area, kitchenette, laundry, separate entrance, and dedicated heating and cooling.
Typical Scope:
New square footage added: 600 to 900 sq. ft.
Cost Per Square Foot:
New living space: $385 to $500 per sq. ft.
Estimated Project Cost:
$231,000 to $450,000+
Costs may increase when the project includes a full bathroom, kitchenette, separate utilities, septic considerations, zoning approvals, or more detailed finish selections.
FROG: FINISHED ROOM OVER GARAGE
A FROG, or finished room over garage, is a popular way to add usable square footage without expanding the home’s footprint. This space can become a guest room, office, playroom, bonus room, gym, or primary suite depending on the layout and structure.
Typical Project Range:
$125,000 to $300,000+
Cost Per Square Foot:
$300 to $500+ per sq. ft.
The final cost depends on whether the garage structure can support finished living space, whether plumbing is added, how HVAC is handled, stair access, insulation, dormers, windows, and code requirements.
A FROG with a bathroom or primary suite layout will typically cost more than a simple finished bonus room.
MUDROOM ADDITION
A mudroom addition can improve daily function by creating space for storage, coats, shoes, backpacks, laundry, or a secondary entry.
Typical Project Range:
$100,000 to $120,000+
Cost depends on size, foundation work, roof tie-in, cabinetry or built-ins, flooring, exterior finishes, doors, windows, heat, electrical, and whether plumbing is included.
A mudroom with a bathroom, laundry, or custom built-ins will cost more than a basic entry addition.
BASEMENT RENOVATION
A basement renovation can add valuable living space for a family room, office, gym, guest space, playroom, bathroom, or entertainment area.
Typical Project Range:
$75 to $200+ per sq. ft.
Larger finished basement projects:
$100,000 to $250,000+
Costs depend on ceiling height, moisture control, insulation, flooring, electrical, plumbing, HVAC, bathroom additions, egress requirements, and the level of finish.
WHOLE-HOME RENOVATION
A whole-home renovation may include kitchen and bathroom updates, flooring, trim, windows, doors, layout changes, electrical, plumbing, HVAC, insulation, and exterior improvements.
Typical Project Range:
$250,000 to $750,000+
These projects are highly customized and depend on the age of the home, existing conditions, structural needs, level of finishes, and how much of the home is being remodeled.