The headline numbers
Fixr puts the average replacement window at about $800 installed, with most falling between $450 and $1,200 and outliers from $300 to $3,000. Labor alone runs about $150 to $300 for a smaller window and up to roughly $800 for a large bay or bow. We found no Knoxville-specific price survey, so treat these as a benchmark.
By frame material
| Material | Installed, per window (Fixr, national) |
|---|---|
| Aluminum | $200–$800 |
| Vinyl | $350–$800 |
| Fiberglass | $400–$1,500 |
| Wood | $600–$2,000 |
| Composite | $300–$2,500 |
By window style
| Style | Installed, per window (Fixr, national) |
|---|---|
| Single-hung | $250–$700 |
| Double-hung | $300–$1,000 |
| Awning | $300–$800 |
| Casement | $400–$1,200 |
| Sliding | $700–$1,500 |
| Picture | $300–$1,600 |
| Bay | $900–$4,500 |
| Bow | $1,500–$8,000 |
Related jobs
| Job | National range (guides) |
|---|---|
| Sealed glass unit only | $250–$1,000 per job; about $150–$400 per double-pane panel |
| Exterior storm window | $150–$400 per window |
| Interior storm window | $75–$200 per window |
| Sliding glass door | $1,000–$7,500; about $2,500 average |
| Basement egress window, new opening | About $2,700–$5,900; average near $4,200 |
What pushes a Knoxville quote up
- Full-frame instead of insert, especially where sills have rotted.
- Second-story access on steep lots, which are common on Knoxville's ridges.
- Historic requirements: wood or specific profiles in an H-1 overlay.
- Custom sizes and shapes, arched tops and dark colors.
- Tempered glass where the code requires it.
- Lead-safe work in pre-1978 homes.
- Structural changes: new or enlarged openings, bays, egress cuts, each with a permit.
Rebates in 2026
- TVA EnergyRight has listed a $15-per-window rebate for replacement windows installed by a Quality Contractor Network member. Confirm with KUB or your power company.
- Income-qualified KUB customers may get free upgrades through Home Uplift.
- Windows put in after the last day of 2025 no longer earn the federal 25C credit.
Comparing quotes
- Line up the same openings, styles and sizes on each quote.
- Compare U-factor and SHGC, not just the brand.
- Check insert vs. full-frame for each opening.
- Read what trim, disposal, permit and lead-safe work are included.
- Verify the Tennessee license for the job size.
Start with vinyl windows if you are pricing a standard swap, or read how installation works.
Back to the main guide: window replacement in Knoxville.