How Much Does Room Addition Cost in Boston, MA?
Boston pricing is 40% above the national average. Updated for 2026.
Based on local labor rates, varied climate conditions, and Boston's diversified economy.See our methodology
Room Addition Pricing in Boston, MA
Boston is a high-cost market where room addition runs about 40% above the national average. The city's diversified economy supports higher wages, which translates to elevated contractor rates. With a population of 675K, competition among providers exists but demand keeps prices firm.
Local climate plays a direct role in room addition costs here. Cold winters and mild summers create seasonal pricing patterns for outdoor work.
Market-specific factors matter in Boston: established contractor market with competitive pricing.
Boston has moderate permitting requirements. Depending on the scope of your room addition project, you may need local permits. A licensed contractor will handle the permitting process as part of the job in most cases.
Boston vs National Average
What Affects Room Addition Cost in Boston?
Size
Small (100 sq ft): $15,000-$25,000. Average (200 sq ft): $30,000-$50,000. Large (400+ sq ft): $60,000-$100,000+
Room Type
Basic bedroom: $20,000-$40,000. Bedroom + bathroom: $35,000-$65,000. In-law suite: $50,000-$100,000+
Per Sq Ft
Budget: $80-$150/sq ft. Mid-range: $150-$250/sq ft. High-end: $250-$400+/sq ft
Boston Market Conditions
established contractor market with competitive pricing
Local Climate Impact
cold winters and mild summers create seasonal pricing patterns for outdoor work
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Tips to Save on Room Addition in Boston
- 1.A bump-out (extending an existing room 2-4 feet) costs $5,000-$15,000 — much less than a full addition
- 2.Building over an existing garage or patio saves on foundation costs
- 3.A dormer addition (expanding attic space) costs 30-50% less than a ground-floor addition
- 4.Act as your own general contractor if you have experience — save 15-25% on management fees
📈 Room Addition in Boston Cost Trends (2020–2024)
Prices have increased +17.7% over the last 5 years
| Year | National Avg | YoY Change |
|---|---|---|
| 2020 | $53,512 | — |
| 2021 | $55,760 | +4.2% |
| 2022 | $59,384 | +6.5% |
| 2023 | $61,047 | +2.8% |
| 2024 | $63,000 | +3.2% |
Based on national averages adjusted for annual inflation. Actual costs vary by location and project scope.
💬 What Did You Pay?
Real costs reported by homeowners for Room Addition in Boston
Recent Reports
Frequently Asked Questions
Does a room addition increase home value?
Yes, though ROI varies: 50-65% for a standard room addition, 60-75% for a bedroom + bathroom addition. The value also depends on whether the addition fits the neighborhood — over-improving for your area yields lower returns.
How long does a room addition take?
Typical timeline: 2-4 weeks for permits and planning. 8-16 weeks for construction. Total: 3-5 months. Complex additions with full bathrooms or custom features can take 6-12 months.
Why does room addition cost different in Boston than other cities?
Boston's costs reflect local labor rates driven by the diversified economy, varied climate conditions that affect materials and scheduling, and moderate permitting requirements. The balanced labor market also influences competitive pricing.
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