Spray Foam Insulation cost: Knoxville vs New South Memphis (2026)
Knoxville and New South Memphis are a near-perfect match on spray foam insulation cost in 2026, both landing around $3,600.
Knoxville TN
Typically around $3,600
New South Memphis TN
Typically around $3,600
Knoxville vs New South Memphis: full breakdown
| Factor | Knoxville | New South 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 |
All figures are 2026 localized planning estimates for spray foam insulation — get an actual quote before you commit.
No real cost edge either way
Neither metro has a cost edge on spray foam insulation — spend your decision-making energy on the contractor, not the location.
Spray foam insulation by type: Knoxville vs New South Memphis
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 | New South Memphis |
|---|---|---|
| Open-cell | $1,450–$4,300 | $1,450–$4,350 |
| Closed-cell | $2,400–$6,650 | $2,400–$6,750 |
Localized 2026 planning estimates — not quotes. Each city adjusts the national spray foam insulation range for local labor, climate and permits.
Spray foam insulation by area: Knoxville vs New South 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 | New South 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 |
Localized 2026 planning estimates — not quotes. Each city adjusts the national spray foam insulation range for local labor, climate and permits.
What insulation pros earn in each metro
Roughly 55% of what you pay for spray foam insulation is labor, which is why local wages explain most of the price gap. The numbers below are actual metro wages for skilled installers, sourced from BLS OEWS — not guesses.
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
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?
Three choices shape an insulation budget — target R-value, whether air-sealing is included, and material type. Our editors weigh how each affects payback.
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 — 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.
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.
Knoxville vs New South Memphis
Is spray foam insulation cheaper in Knoxville or New South Memphis?
Practically identical — expect around $3,600 for spray foam insulation whichever city you're in.
Why does spray foam insulation cost more in New South Memphis than Knoxville?
It comes down to labor: New South Memphis indexes at 0.96 against Knoxville's 0.95. The mixed-vs-mixed climate difference adds to the gap.
How much is spray foam insulation in Knoxville, TN?
spray foam insulation in Knoxville runs $1,450–$5,700 as of 2026 — most jobs land near $3,600.
When is the cheapest time to buy spray foam insulation — and does it differ by city?
No, the seasonal pattern is the same in Knoxville and New South Memphis: book during Spring and summer for about 5–10% in savings. The pre-winter fall rush is the priciest stretch in both cities, mostly due to emergency replacements.
Should I choose where to live based on spray foam insulation cost?
There's no cost argument here between Knoxville and New South Memphis — they're a wash. Focus on contractor reputation, project scope, equipment tier and timing.
Compare spray foam insulation in other cities
Updated June 2026 · By Serhat Özçelik