Home Addition Cost Guide
What Does It Cost to Build a Structural Home Addition in Worceter and Metor West Massachusetts?
In Central Massachusetts, most structural home additions typically range from $175,000 to $600,000+ depending on size, engineering complexity, foundation requirements, roofline integration, and finish level.
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Compare Home Addition Investment Levels in Massachusetts
All structural additions are designed and built to meet current Massachusetts building codes, structural engineering requirements, and energy standards.
*Investment ranges below reflect typical structural home additions in Central Massachusetts. Final costs depend on engineering complexity, foundation work, roofline integration, site conditions, and finish level. Appliance allowances and custom architectural features may increase overall investment.
$175K–$250K | Small Addition / Bump-Out
$350–$500+ per sq. ft.- Foundation extension or slab + framing
- Roof tie-in and exterior siding/trim match
- New windows/doors; insulation and air-sealing
- Electrical + HVAC extensions as needed
- Finish level and site conditions drive range
$250K–$375K | Rear / Side Addition
$375–$550+ per sq. ft.- New foundation + structural framing
- Kitchen/family room expansions; larger openings
- Mechanical runs (HVAC, electrical, plumbing as needed)
- Exterior integration: siding, roofing, windows, gutters
- If panel/HVAC upgrades are needed: add $5K–$25K+
$325K–$500K+ | Primary Suite / Major Addition
$425–$650+ per sq. ft.- Bedroom + bath + walk-in closet build-out
- Plumbing-heavy scope; higher finish allowances
- Structural integration and layout reconfiguration
- Window packages and exterior detailing impact cost
- If complex site work is required: add $10K–$40K+
$350K–$600K+ | Second-Story Addition
$450–$700+ per sq. ft.- Engineering + structural reinforcement (beams/posts)
- Roof removal/rebuild; dormers and tie-ins
- Staircase redesign and floorplan integration
- HVAC zoning and electrical upgrades often required
- If foundation needs reinforcement: add $15K–$60K+
What Drives the Cost of a Home Addition in Massachusetts?
Structural Engineering & Load-Bearing Modifications
Major home additions often require steel beams, LVLs, structural posts, and engineered framing to safely support new loads. Second-story additions or large rear expansions typically involve reinforcing existing foundations and framing systems.
Foundation & Site Work
New foundations, slab work, excavation, drainage corrections, and site grading significantly impact investment levels. Homes with challenging soil conditions or tight lot access may require additional engineering and labor.
Roofline Integration & Exterior Matching
Seamlessly tying into an existing roofline, matching siding, trim, and window packages requires precision craftsmanship. Architectural consistency is critical for maintaining your home's value and curb appeal.
Mechanical Systems (HVAC, Electrical, Plumbing)
Large additions often require panel upgrades, HVAC zoning, plumbing extensions, and updated insulation to meet current Massachusetts energy code requirements.
Finish Level & Architectural Detail
Custom millwork, high-end cabinetry, specialty windows, and architectural trim packages can significantly increase overall investment. Finish selections play a major role in final pricing.
Planning a Structural Home Addition in Massachusetts?
If your project aligns with the structural investment ranges outlined above, schedule a design consultation with our team. We’ll review feasibility, engineering requirements, budget expectations, and how your addition can integrate seamlessly with your existing home.
Schedule Your Addition Design ConsultationConsidering other updates to your home? Use the links below to explore what it costs to remodel other areas of your home.
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Under this warranty, CORE Remodeling Services will be provided the opportunity to have one of its representatives assess any damage identified to be caused by CORE Remodeling Services, Inc employees and/or material installed by CORE Remodeling Services. If said damage is judged to be the fault of CORE Remodeling Services workmanship and/or material, CORE Remodeling Services will at no cost to the Owner repair or replace defective material.
