Spray Foam Insulation cost: Duluth vs St. Paul (2026)
In 2026, spray foam insulation is about 17% less expensive in Duluth than in St. Paul. Most homeowners pay around $3,750 in Duluth versus $4,400 in St. Paul — a gap of roughly $650.
Duluth MN
Lower costTypically around $3,750
St. Paul MN
Typically around $4,400
Duluth vs St. Paul: full breakdown
| Factor | Duluth | St. Paul |
|---|---|---|
| Typical 2026 cost | $3,750 | $4,400 |
| Estimated range | $1,500–$6,000 | $1,750–$7,000 |
| Labor index (vs US) | ×0.94 | ×1.1 |
| Climate zone | Cold | Cold |
| Climate factor | ×1.06 | ×1.06 |
| Local permit | None | None |
| Labor share | $2,050 | $2,400 |
| Materials/equipment | $1,700 | $2,000 |
Localized 2026 planning estimates — not quotes. Each city adjusts the national spray foam insulation range for local labor, climate and permits.
Is the gap worth worrying about?
A 17% gap is meaningful on a project this size — about $650. That's real money, but it's often within reach of off-season timing and a tighter apples-to-apples bid in St. Paul.
Spray foam insulation by type: Duluth vs St. Paul
Each spray foam insulation option, priced separately for both metros — the same local labor, climate and permit adjustments applied per city, so you can compare like for like.
| Type | Duluth | St. Paul |
|---|---|---|
| Open-cell | $1,500–$4,500 | $1,750–$5,250 |
| Closed-cell | $2,500–$6,950 | $2,900–$8,150 |
Localized 2026 planning ranges by type — not quotes.
Spray foam insulation by area: Duluth vs St. Paul
Spray foam is priced by board foot (1 sq ft at 1 inch thick), which works out to about $1.50–$5 per sq ft of surface installed depending on foam type and thickness. Closed-cell costs more but adds twice the R-value per inch.
| Size | Duluth | St. Paul |
|---|---|---|
| 500 sq ft | $900–$2,400 | $1,050–$2,800 |
| 1,000 sq ft | $1,500–$4,000 | $1,750–$4,650 |
| 1,500 sq ft | $2,200–$5,500 | $2,550–$6,400 |
| 2,000+ sq ft | $2,800–$6,450 | $3,250–$7,550 |
Localized 2026 ranges by area — not quotes.
What insulation pros earn in each metro
Labor is about 55% of a spray foam insulation bill, so local wages drive most of the gap. These are real metro hourly wages for skilled installers (BLS OEWS), not estimates.
No BLS metro wage series for Duluth; we use Minnesota regional price parity instead.
Minneapolis-St. Paul-Bloomington metro · about 18% above the US average installer wage.
Source: U.S. Bureau of Labor Statistics, OEWS metro wages for HVAC installers (used as a trade-labor index).
Cheapest time for spray foam insulation in either city
Everyone insulates in fall before winter, so that's the busy, full-price season. Booking in spring or summer catches off-peak pricing — and utility rebate budgets are often freshest early in the year.
How much insulation is worth paying for?
R-value, air-sealing and material decide both the price and the payback. Our editors on the trade-offs.
The R-value case
Insulate to the DOE recommendation for your climate zone — under-insulating to save money leaves comfort and energy savings on the table that would have paid the job back.
The air-sealing case
Insulation without air-sealing underperforms. Sealing leaks first is cheap and often delivers more comfort per dollar than thicker insulation alone — make sure it's in the scope.
The rebate case
Insulation has some of the best rebate math in home improvement — federal 25C credits plus utility programs can cover a large share. Check DSIRE before you book and time it to a fresh rebate budget.
Hit the DOE R-value for your zone, air-seal first, and stack the rebates. Insulation is one of the few upgrades where doing it fully is also the cheapest path to payback.
Duluth vs St. Paul
Is spray foam insulation cheaper in Duluth or St. Paul?
In 2026, spray foam insulation is cheaper in Duluth at about $3,750, versus $4,400 in St. Paul — a difference of about $650 (17%).
Why does spray foam insulation cost more in St. Paul than Duluth?
The main driver is local labor rates: St. Paul's labor index is 1.1 versus 0.94 in Duluth. Climate zone (cold vs cold) also shift the total.
How much is spray foam insulation in Duluth, MN?
In Duluth, spray foam insulation typically runs $1,500–$6,000 in 2026, with most homeowners paying around $3,750.
When is the cheapest time to buy spray foam insulation — and does it differ by city?
The best window is the same in both Duluth and St. Paul: Spring and summer, when demand drops and installers discount to keep crews busy — typically 5–10% off peak pricing. The most expensive time anywhere is an emergency replacement during the pre-winter fall rush.
Should I choose where to live based on spray foam insulation cost?
Rarely. The $650 difference is real but one-time, and you can often close most of it in St. Paul by buying in the off-season and getting tighter, apples-to-apples bids. Ongoing factors — energy prices, climate and home condition — matter more over the life of the system.
Compare spray foam insulation in other cities
Updated June 2026 · By Serhat Özçelik