BattWiseR-value targets by climate zone, and what it takes to hit them.

How much does it cost to insulate a 1600 sq ft attic in Troy, MI?

Blown-in attic insulation in Troy, MI
$2,960
1,600 ft² of attic floor · typical range $1,558 – $4,361
Typical total$1.85 per ft² of attic floor$2,960
Range you should see in bidsthree bids on the same scope normally land inside this$1,558 – $4,361
Labor portion45% of the job — this is the part that moves by city$1,332
Material portion55% — bought at national prices$1,628
Insulation Workers, Floor, Ceiling, and Wall pay near Troyabout $25/hr · Detroit-Warren-Dearborn, MI metro$51,520/yr
U.S. mean for the same tradeSOC 47-2131$54,740/yr
Versus the national pricetrade pay here runs −5.9% against the U.S. mean−$80
Climate zone 5BIECC R402.1.3 asks for R-60 in the attic at zone 5. 6,204 heating degree days and 720 cooling degree days is what that zone is standing in for—

Notes

  • Where the number comes from. The national price for blown-in attic insulation is $1.90 per ft² of attic floor — blown-in insulation pricing published for 2026, $1.00–$2.80 per ft². Labor is about 45% of that. Insulation Workers, Floor, Ceiling, and Wall near Troy, MI average $51,520 a year against a U.S. mean of $54,740 — a factor of 0.941 — so the labor half is scaled by that and the material half is not. Source: BLS OEWS May 2025 for the Detroit-Warren-Dearborn, MI metro area, SOC 47-2131.
  • Why the city matters, not just the state. Trade pay moves inside a state as much as it does between states. Crews do not commute across a state to bid a job, and materials ship at national prices either way — so a metro wage is the honest input here and a state average quietly rounds four different cities into one number.
  • Climate zone 5B. IECC R402.1.3 asks for R-60 in the attic at zone 5. 6,204 heating degree days and 720 cooling degree days is what that zone is standing in for.
  • What is in the price: blown fiberglass or cellulose to about R-49, baffles at the eaves, and labor.
  • What is not: removing existing insulation, air sealing before the blow, and any knob-and-tube remediation. These are the lines that turn a $2,960 quote into a $3,699 invoice, so ask about each one before signing.
  • Use this as a bid check, not a quote. It prices an average job in average condition. Difficult access, the state of what is being replaced, the season, and a crew booked out three months all move the real number, and none of them are in a per-unit average.

blown-in attic insulation in Troy, MI

$2,960 is the typical number, and three bids on the same scope normally land between $1,558 and $4,361.

That is $80 less than the same job priced at the national average.

Why the city changes the number

About 45% of this job is labor — $1,332 of the $2,960 above. Labor is the only part that moves locally; a bundle of material costs what it costs wherever it is nailed down.

Insulation Workers, Floor, Ceiling, and Wall near Troy average $51,520 a year, against a U.S. mean of $54,740. That is a factor of 0.941, so the labor half is scaled by it and the material half is not.

Source: BLS OEWS May 2025 for the Detroit-Warren-Dearborn, MI metro area, SOC 47-2131.

What the quote should include

Climate zone 5B

The lines that turn a quote into an invoice

Ask about each of them before you sign. On a job this size they are the difference between $2,960 and something a quarter higher.

Use it as a bid check, not a quote

This prices an average job in average condition. Access, the state of what is being replaced, the season, and a crew booked out three months all move the real number, and none of them are in a national average.

If a bid lands outside $1,558 – $4,361, that is not automatically wrong — but it is the question worth asking out loud.

Nearby sizes

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