Spray Foam Insulation cost: Knoxville vs Memphis (2026)
Spray foam insulation costs about the same in Knoxville and Memphis in 2026 — roughly $3,600 in each.
Knoxville TN
Typically around $3,600
Memphis TN
Typically around $3,600
Knoxville vs Memphis: full breakdown
| Factor | Knoxville | Memphis |
|---|---|---|
| Typical 2026 cost | $3,600 | $3,600 |
| Estimated range | $1,450–$5,700 | $1,450–$5,750 |
| Labor index (vs US) | ×0.95 | ×0.96 |
| Climate zone | Mixed | Mixed |
| Climate factor | ×1 | ×1 |
| Local permit | None | None |
| Labor share | $2,000 | $2,000 |
| Materials/equipment | $1,600 | $1,600 |
Spray foam insulation numbers here are 2026 planning ranges, adjusted per city — useful for budgeting, not a substitute for an actual quote.
A wash — choose on quality, not city
This is a statistical tie on spray foam insulation cost, so let contractor reputation and project timing decide, not geography.
Spray foam insulation by type: Knoxville vs Memphis
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 | Knoxville | Memphis |
|---|---|---|
| Open-cell | $1,450–$4,300 | $1,450–$4,350 |
| Closed-cell | $2,400–$6,650 | $2,400–$6,750 |
Treat these as 2026 localized estimates for spray foam insulation, not quotes from a contractor.
Spray foam insulation by area: Knoxville vs Memphis
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 | Memphis |
|---|---|---|
| 500 sq ft | $850–$2,300 | $850–$2,300 |
| 1,000 sq ft | $1,450–$3,800 | $1,450–$3,850 |
| 1,500 sq ft | $2,100–$5,250 | $2,100–$5,300 |
| 2,000+ sq ft | $2,650–$6,200 | $2,700–$6,250 |
All figures are 2026 localized planning estimates for spray foam insulation — get an actual quote before you commit.
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.
Memphis metro · about 7% 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
Demand for insulation spikes every fall as winter approaches, pushing prices with it. Spring and summer avoid that crowd, and utility rebate pools are frequently still fresh that early in the year.
How much insulation is worth paying for?
Insulation is priced on more than thickness. Target R-value, the presence or absence of air-sealing, and the material itself each pull the number in a different direction, and each changes how fast the job pays for itself.
The air-sealing case
Blown-in or batt, insulation can only slow the heat that isn't already escaping through gaps and penetrations. Sealing those leaks costs little and frequently buys more comfort per dollar than piling on extra R-value, so confirm it's written into the scope.
The rebate case
Insulation has some of the best rebate math in home improvement — utility and state programs can cover a solid share (the federal 25C credits ended Dec 2025). Check DSIRE before you book and time it to a fresh rebate budget.
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.
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 Memphis
Is spray foam insulation cheaper in Knoxville or Memphis?
spray foam insulation costs about the same in both — roughly $3,600 in each city.
Why does spray foam insulation cost more in Memphis than Knoxville?
Labor rates explain most of it — 0.96 in Memphis vs 0.95 in Knoxville. A mixed climate versus mixed accounts for the rest.
How much is spray foam insulation in Knoxville, TN?
Expect to pay $1,450 to $5,700 for spray foam insulation in Knoxville in 2026, averaging around $3,600.
When is the cheapest time to buy spray foam insulation — and does it differ by city?
It doesn't vary by location — Spring and summer is the discount window in both Knoxville and Memphis (roughly 5–10% off), while the pre-winter fall rush tends to be the most expensive in either city.
Should I choose where to live based on spray foam insulation cost?
Not on this basis — Knoxville and Memphis cost about the same. Weigh contractor quality, scope, equipment tier and timing instead.
Compare spray foam insulation in other cities
Updated June 2026 · By Serhat Özçelik