Dense, old and full of two-families
Spray Foam Insulation in Somerville, MA
Two-families and triple-deckers north of Cambridge.
- Free on-site estimates in Boston and the inner suburbs
- Written quotes that list material, thickness and R-value for every area
- Old wiring, vermiculite and moisture flagged before any work is planned
Somerville's Multi-Family Housing
Spray Foam Insulation in Somerville usually means a two-family or triple-decker. Wikipedia lists the city at 81,045 residents in 2020, directly northwest of Boston and north of Cambridge. Europeans first settled the area in 1629 as part of Charlestown; Somerville became a town in 1842 and a city in 1872. Most of its housing is old and closely packed.
Save Energy Somerville
The city runs Save Energy Somerville, formerly Somerville Energy Efficiency Now and Somerville Road to Net Zero. Its page points residents to a no-cost Mass Save Home Energy Assessment, notes that some residents may qualify for free weatherization through Mass Save, and lists microgrants of $2,000 each for 25 rental units in two- to four-unit buildings. It also lists HEAT Loan financing.
Two-families and triple-deckers
Somerville's multi-families have shallow roof cavities, empty walls, porches tied into the frame and bare rim joists. We plan the building as a whole: rim joist and roof first where possible, then walls floor by floor.
Owners and renters
Many Somerville buildings mix an owner unit with rentals. We schedule around everyone and tell tenants about re-entry times for foam work.
Barriers
Knob-and-tube wiring and vermiculite are common in houses this old. We check before planning and tell you what we find.
Costs
HomeGuide lists dense-pack cellulose at $1.60 to $4.20 per square foot and rim joist foam at $2,000 to $2,500 nationally. A multi-family has more area, so each part is priced separately.
Budgeting with the microgrant
Save Energy Somerville lists microgrants of $2,000 each for 25 rental units in two- to four-unit buildings, and Mass Save offers its own incentives after an assessment. If you plan to use those, start with the city program and the assessment. For work outside the programs, such as rim joist foam or finished attic rooms, we price directly and list each item separately.
Get started
We walk the building and send a written quote. Get a free estimate
What to Know in Somerville
- Population. Somerville had 81,045 residents at the 2020 census (Wikipedia).
- History. Settled in 1629 as part of Charlestown; incorporated as a town in 1842 and a city in 1872 (Wikipedia).
- City program. Save Energy Somerville points residents to no-cost Mass Save assessments and lists $2,000 microgrants for 25 rental units in 2-4 unit buildings.
- Free weatherization. The city's page says some residents may qualify for free weatherization upgrades through Mass Save.

Somerville Questions
What is Save Energy Somerville?
The city's energy program, formerly Somerville Energy Efficiency Now and Road to Net Zero. It points residents to Mass Save assessments and lists microgrants for some rental units.
Can you insulate a two-family while both units are occupied?
Usually. Foam inside a unit needs it empty for about a day; other work can happen with people at home.
Do you work across Somerville?
Yes.
How do I apply for the Somerville microgrant?
Through the city's Save Energy Somerville program. Check its page for current availability and rules.
Free Estimates in Somerville, MA
Somerville owners: book a free estimate.
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