Spray Foam Insulation cost: Knoxville vs Murfreesboro (2026)
The two metros aren't quite in sync on spray foam insulation: Knoxville sits 1% below Murfreesboro, or roughly $3,600 versus $3,650 — about $50 apart.
Knoxville TN
Lower costTypically around $3,600
Murfreesboro TN
Typically around $3,650
Knoxville vs Murfreesboro: full breakdown
| Factor | Knoxville | Murfreesboro |
|---|---|---|
| Typical 2026 cost | $3,600 | $3,650 |
| Estimated range | $1,450–$5,700 | $1,450–$5,800 |
| Labor index (vs US) | ×0.95 | ×0.97 |
| Climate zone | Mixed | Mixed |
| Climate factor | ×1 | ×1 |
| Local permit | None | None |
| Labor share | $2,000 | $2,000 |
| Materials/equipment | $1,600 | $1,650 |
These are 2026 planning figures for spray foam insulation, localized to each city — not formal quotes.
Is the gap worth worrying about?
That 1% gap is small — for spray foam insulation it's usually less than the spread between two local contractors' quotes, so the metro matters far less than who you hire and when you buy.
Spray foam insulation by type: Knoxville vs Murfreesboro
We localize each spray foam insulation type separately for both metros, applying the same labor, climate and permit adjustments each time, so you're comparing like for like.
| Type | Knoxville | Murfreesboro |
|---|---|---|
| Open-cell | $1,450–$4,300 | $1,450–$4,350 |
| Closed-cell | $2,400–$6,650 | $2,400–$6,800 |
These are 2026 planning figures for spray foam insulation, localized to each city — not formal quotes.
Spray foam insulation by area: Knoxville vs Murfreesboro
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 | Knoxville | Murfreesboro |
|---|---|---|
| 500 sq ft | $850–$2,300 | $850–$2,350 |
| 1,000 sq ft | $1,450–$3,800 | $1,450–$3,900 |
| 1,500 sq ft | $2,100–$5,250 | $2,150–$5,350 |
| 2,000+ sq ft | $2,650–$6,200 | $2,700–$6,300 |
Spray foam insulation numbers here are 2026 planning ranges, adjusted per city — useful for budgeting, not a substitute for an actual quote.
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 Knoxville; we use Tennessee regional price parity instead.
Nashville-Davidson--Murfreesboro--Franklin metro · about 6% below 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
Because most homeowners wait for the fall pre-winter panic, that's when prices peak. Getting it done in spring or summer means less competition and, often, an untapped rebate budget.
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 rebate case
Few home projects come with rebate support like insulation does — utility and state programs routinely offset a meaningful slice of the bill (the federal 25C credit closed in December 2025). Run your address through DSIRE first, and book when a program's yearly budget has just refilled.
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.
Payback is the whole point with insulation, and it arrives fastest when the job is done in full: air-sealing, the DOE-recommended R-value for your climate zone, and whatever utility rebates you qualify for. Trimming any one of those trims the return, not the cost.
Knoxville vs Murfreesboro
Is spray foam insulation cheaper in Knoxville or Murfreesboro?
Knoxville comes out ahead here, at roughly $3,600 for spray foam insulation compared with $3,650 in Murfreesboro — a 1% ($50) gap as of 2026.
Why does spray foam insulation cost more in Murfreesboro than Knoxville?
Murfreesboro's higher labor index (0.97 vs 0.95 in Knoxville) is the biggest factor, with the mixed/mixed climate split playing a smaller role.
How much is spray foam insulation in Knoxville, TN?
In Knoxville, spray foam insulation typically runs $1,450–$5,700 in 2026, with most homeowners paying around $3,600.
When is the cheapest time to buy spray foam insulation — and does it differ by city?
The best window is the same in both Knoxville and Murfreesboro: 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?
Probably not. Yes, $50 is a real gap, but it's a one-time cost you can partly offset in Murfreesboro with off-season timing and tighter bids. Long-term factors like energy prices and home condition matter more than this one number.
Compare spray foam insulation in other cities
Updated June 2026 · By Serhat Özçelik