Attached garage addition cost in Massachusetts
A garage of about 24 x 24 ft in Massachusetts usually costs about $50,900 to $87,100 with standard materials when you hire it out. If you do the work yourself and hire only the licensed trades, it is about $28,100 to $50,600. The tables below show three sizes at three material levels. They include the foundation, frame, roof, windows and doors, the finish, plans and permits, a dumpster, delivery, sales tax and a 15% cushion for surprises.
Price my own garageCost by size and materials
Each box shows a low, a likely and a high price for the whole job. "Hired out" means pros do everything. "Do it yourself" means you do the jobs that are fine to do yourself and still pay for the licensed trades.
| Hired out | Do it yourself |
|---|---|
| Budget materials Cheapest that's still decent | |
| Low $29,100Likely $39,700High $50,400 | Low $15,500Likely $22,100High $28,700 |
| Standard materials Off the shelf at Home Depot or Lowe's | |
| Low $32,800Likely $44,800High $56,800 | Low $18,700Likely $26,500High $34,200 |
| Premium materials Specialty stores, custom pieces | |
| Low $42,800Likely $58,400High $74,000 | Low $27,500Likely $38,100High $48,700 |
| Hired out | Do it yourself |
|---|---|
| Budget materials Cheapest that's still decent | |
| Low $44,900Likely $60,900High $76,900 | Low $22,900Likely $32,400High $41,900 |
| Standard materials Off the shelf at Home Depot or Lowe's | |
| Low $50,900Likely $69,000High $87,100 | Low $28,100Likely $39,400High $50,600 |
| Premium materials Specialty stores, custom pieces | |
| Low $66,900Likely $90,700High $114,400 | Low $42,200Likely $57,900High $73,600 |
| Hired out | Do it yourself |
|---|---|
| Budget materials Cheapest that's still decent | |
| Low $58,700Likely $79,500High $100,200 | Low $29,400Likely $41,500High $53,600 |
| Standard materials Off the shelf at Home Depot or Lowe's | |
| Low $66,700Likely $90,200High $113,800 | Low $36,400Likely $50,700High $65,000 |
| Premium materials Specialty stores, custom pieces | |
| Low $88,000Likely $119,000High $150,000 | Low $55,000Likely $75,300High $95,500 |
What is included
For the medium size.
- Foundation: excavation and backfill; footing: concrete and rebar; foundation wall: concrete; foundation wall: forming and pouring; concrete slab, 5 in, with gravel, mesh and vapor barrier.
- Frame, roof and siding: wall framing: ground level; roof: rafters, sheathing, underlayment, shingles, drip edge; siding: ground level.
- Windows, doors and openings: garage door, installed; fire-rated door from the garage into the house.
- Ground level: Garage: fire separation: 5/8 in type x board; electrical: outlets, lights, wiring.
- Site, plans and permits: plot plan.
What it could add to the house's value
About $18,000 to $30,000 for the medium size, or 30 to 50% of the likely hired-out price before the cushion for surprises ($60,000).
Additions rarely pay back their full cost when the house sells. In 2025, New England additions got back about 39 to 44% of their cost (Cost vs. Value report). Doing more of the work yourself lowers your cost but not the value. Ask a local agent or appraiser for your street.
What we assumed
- A ranch house with the addition joined to it, one level, with a shed roof
- Town sewer, a flat lot, no ledge, and a concrete truck can reach the spot
- Built in spring, with a 200 amp electrical panel
- No wetlands nearby, and the new wall is well clear of the property line
Things that can add cost
These are not in the tables above. The estimator asks about your house and lot and adds the ones that apply.
- Ledge or boulder removal: $3,000 to $20,000.
- Possible septic upgrade: $15,000 to $45,000.
- Possible sewer fee per added bedroom (each): $500 to $4,200.
- Concrete pump truck (each pour): $600 to $1,200.
- Conservation Commission filing: $300 to $2,500.
- Engineer-stamped plans: $1,500 to $4,000.
See the other cost guides, the privacy page and the terms.