Short answer: in Tampa Bay, repairing dry rot around a window costs about $155 to $810, a door frame repair about $355 to $860, and a siding repair about $577 to $2,026 (Angi's Tampa pages, 2026). Nationally, HomeAdvisor puts professional dry rot repair at $500 to $2,355, or $5 to $50 per square foot (June 2026). Rot that has reached framing or joists costs more.
These are typical ranges, not quotes. How far the rot has spread behind the paint is what moves the price most.
How much does it cost to repair wood rot?
| Repair | Typical cost | Scope | Do it yourself? |
|---|---|---|---|
| Window dry rot repair | $155–$810 | Tampa (Angi, Sept. 2026) | Some of it: small epoxy fills, if the paint isn't lead |
| Window sill replacement | $155–$405 | Tampa (Angi, Sept. 2026) | No: the sill ties into the window's flashing |
| Window frame replacement | $205–$1,010 | Tampa (Angi, Sept. 2026) | No |
| Door frame repair | $355–$860 | Tampa (Angi, Aug. 2026) | No: the frame holds the door and its seal |
| Siding repair | $577–$2,026, average $1,273 | Tampa (Angi, July 2026) | Some of it: a single board at ground level |
| Deck repair | $622–$2,451, average $1,537 | Tampa (Angi, Aug. 2026) | Some of it: replacing loose deck boards |
| Professional dry rot repair | $500–$2,355, average $1,428 | National (HomeAdvisor, June 2026) | Depends on where it is |
Wood rot repair cost per square foot and per linear foot
| Item | Typical cost | Scope |
|---|---|---|
| Dry rot repair | $5–$50 per sq ft | National (HomeAdvisor) |
| Siding repair, dry rot | $9–$15 per sq ft | Tampa (Angi) |
| Siding repair, water damage | $25–$45 per sq ft | Tampa (Angi) |
| Trim repair | $3–$25 per sq ft | Tampa (Angi) |
| Fascia and soffit repair | $6–$20 per linear foot | National (HomeAdvisor) |
| Deck railing replacement | $24–$145 per linear foot | Tampa (Angi) |
| Subfloor replacement | $3–$10 per sq ft | National (Angi) |
Fascia and soffit rot
HomeAdvisor puts fascia and soffit repair at $1,050 to $3,300, with an average of $2,500, or about $6 to $20 per linear foot (national, June 2026). Fascia boards cost about $3 to $7 per linear foot in PVC versus $1 to $3 in wood, on HomeAdvisor's materials table. We couldn't find a Tampa figure for fascia and soffit.
Rot in framing, joists and subfloors
Once rot reaches the structure, the job changes. HomeAdvisor's national figures (June 2026):
| Location | Typical cost |
|---|---|
| Floor joists | $20–$60 per sq ft |
| Window framing | $200–$600 per window |
| Door framing | $300–$1,500 per door |
| Walls | $1,000–$6,000 per wall |
Angi puts a single floor joist at $100 to $300 to replace, and a bathroom subfloor at $120 to $400 (national, Oct. 2026). Under s. 489.113(3)(a), Fla. Stat., a general, building or residential contractor is responsible for construction or alteration of structural components.
What drives the price
- How far the rot goes: trim only, or into the framing or subfloor.
- Where it is: ground-level trim is easier than fascia at the roof edge.
- Materials: PVC fascia board costs more than wood per foot (HomeAdvisor); our advice is that it holds up better where wood keeps getting wet.
- Matching: historic or custom profiles cost more to match.
- Termites: if they're present, our advice is to have a licensed pest control company treat first; treatment is licensed pest control work (s. 482.071).
- Old paint: the EPA requires anyone paid to disturb paint in a pre-1978 home to be lead-safe certified.
Permits in Pinellas County
Whether a rot repair needs a permit depends on the city and the scope. St. Petersburg's Building Permits page says its under-$7,500 exemption doesn't cover structural components, "including window and door replacement, roofing, soffit and fascia, or siding," or properties in a flood hazard area, and its list of exempted permits says properties in historic districts "may not be exempt from permit requirements." The state exemption is in s. 553.79(1)(g), Fla. Stat.. In St. Pete's local historic districts, exterior changes may also need a Certificate of Appropriateness. Ask your building department before work starts.
Frequently asked questions
How much does it cost to fix wood rot?
In Tampa, window dry rot repair runs about $155 to $810 and door frame repair about $355 to $860 (Angi, 2026). HomeAdvisor's national range for professional dry rot repair is $500 to $2,355.
How much does it cost to repair wood rot around windows?
Angi's Tampa figures are $155 to $810 for dry rot repair, $155 to $405 to replace a sill, and $205 to $1,010 to replace a window frame (Sept. 2026).
How much does it cost to replace rotted wood on a house?
For siding, Angi's Tampa range is $577 to $2,026, or $9 to $15 per square foot for dry rot repair. For fascia and soffit, HomeAdvisor's national range is $1,050 to $3,300.
Can I repair wood rot myself?
Small soft spots in trim can be consolidated with epoxy and filled, a method the National Park Service describes. Leave structural wood, ladder work and paint on pre-1978 homes to a pro. See our post on wood rot in St. Petersburg homes.
Sources
- Angi, window frame and sill replacement cost in Tampa (updated Sept. 11, 2026)
- Angi, cost to fix a door in Tampa (updated Aug. 18, 2026)
- Angi, siding repair cost in Tampa (updated July 9, 2026)
- Angi, deck repair cost in Tampa (updated Aug. 4, 2026)
- HomeAdvisor, carpentry and framing repair / dry rot cost (updated June 20, 2026)
- HomeAdvisor, fascia and soffit repair cost (updated June 17, 2026)
- Angi, subfloor replacement cost (updated Oct. 1, 2026)
- City of St. Petersburg: Building permits
- City of St. Petersburg: List of exempted permits (PDF)
- City of St. Petersburg: Historic preservation
- National Park Service: Preservation Brief 9 (PDF)
- EPA: Lead Renovation, Repair and Painting Program
- Florida Statutes s. 553.79 (2026)
- Florida Statutes s. 489.113 (2026)
- Florida Statutes s. 482.071 (2026), pest control licensing
These ranges come from the published sources listed above (Tampa Bay, Florida or national, as marked). They aren't PHRS prices or quotes. Termite inspection and treatment is licensed pest control work in Florida (s. 482.071, Fla. Stat.); we don't do it. These are published price ranges, not our quotes.
General information, not legal, insurance or engineering advice. Rules change and vary by city; confirm with your building department, DBPR, your insurer, an attorney or an engineer as fits.