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Refinishing Hardwood? Measure the Wear Layer Before Sanding

Updated 2026-09-03 · Sources verified 2026-07-20

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Short answer: no permit. Floor covering is named in the exempt cosmetic class — sanding and refinishing what is already there is finish work. The dust containment and finish fumes deserve more planning than the paperwork does. The full answer and its source are below, with the code requirements and mistakes that trip up Orlando homeowners.

The permit answer

No permit. Floor covering is named in the exempt cosmetic class — sanding and refinishing what is already there is finish work. The dust containment and finish fumes deserve more planning than the paperwork does.
Source: https://codes.iccsafe.org/s/FLBC2023P1/chapter-1-scope-and-administration/FLBC2023P1-Ch01-SubCh02-Sec105.2

Orange County and the City of Orlando run separate permit offices with separate portals — and your mailing address alone doesn't tell you which one covers your home. Check which permit office covers your address →

Key facts before you start

Engineered wood: measure the wear layer BEFORE planning a sand — at a floor-register cut, under a transition molding, or in a board gap down to the top of the tongue. NWFA's Sand and Finish Guidelines: in general, if wear thickness is less than 2.5 mm (3/32"), the floor should not be sanded at all. A full sand-and-finish OPERATION (the whole multi-grit job, not one pass) removes about 1/32" — NWFA's chart reads 1/32" +/- — so a 4/32" unfinished engineered floor lands near 3/32" after its first site finish: still refinishable, not used up. (NWFA)
Recoat prep decides adhesion, and it is product-specific, not generic scuffing. Bona Traffic HD: the floor must be free of wax, polish and oily residues; with contaminants present you need the full Bona Recoat System (Remover + Rinse + PowerScrubber + Recoat Abrasive on a 175 rpm rotary buffer), while a clean poly floor uses Bona Prep. 'Adhesion failure can occur if these recoating processes are not followed, and the floor has not been tested for compatibility' — test an inconspicuous area first. Suspected wax or oil soap = contractor job, not a DIY scuff-and-coat. If you ARE doing the full sand, Bona's final-cut sequence depends on whether it gets stained: 'For a stained floor, make your final cut with 80 to 100-grit paper, then multidisc with 80 to 120-grit paper. For an unstained floor, make your final cut with 80 to 120-grit paper, then multidisc with 120 to 150-grit paper.' (Bona)
Cure is not dry. Bona Traffic HD (TDS rev. 05/27/2026): each coat dries 2-3 hr; cure is ~3 days (80% at 1 day, 100% at 3). Walkable at 24 hr but it 'remains susceptible to scuffing or marring until completely cured,' and 'do not replace area rugs until the floor has fully cured.' Older sheets said 7 days and are still widely quoted online — 3 days is the current figure. (Bona)
Run the A/C while finishing. Bona Traffic HD's stated application conditions are 65-80F and 40-60% RH, and 'high humidity and/or low temperature will extend the dry time' past the 2-3 hr between coats — an unconditioned Orlando house in summer sits well outside that. NWFA separately recommends holding the home at 60-80F and 30-50% RH year-round because moisture GAIN is what cups boards; target the 40-50% overlap and both are satisfied. (Bona / NWFA)
Oil-based stain rags AND the sanding residue self-heat and can ignite with no spark — the failure mode is material piled, wadded, or bagged where heat cannot escape. Minwax DANGER text: 'Immediately place rags, steel wool, other waste soaked with this product, and sanding residue in a sealed, water-filled, metal container.' The accepted alternative is laying rags flat and separated on a non-combustible surface, away from the structure, until fully cured — never a wad in a trash bag. Do not leave stain-loaded dust in a sealed shop-vac canister overnight. (Minwax)
Permit: unincorporated Orange County lists 'installation or replacement of finished floor covering' among minor repairs needing NO permit. Refinishing an existing floor is not named on that list — it is generally treated as exempt finish work, so confirm rather than assume, and that list governs unincorporated county only (Orlando, Winter Park, Windermere, Apopka, Ocoee, Maitland and Winter Garden each run their own department). The exemption ends the moment you go past the surface: subfloor or joist repair, wet-area waterproofing, or moving plumbing/electrical all require a permit. (Orange County Division of Building Safety)

What it costs

DIY: $500–$1,000 total for DIY rentals and materials; drum sander rents for $50–$80 per day (edger $35–$45/day, belt sander $15–$25/day)
Hiring it out: $3–$8 per sq ft professionally refinished, ~$1,800 average total project (single bedroom $300–$800)
Typical range corroborates at $2–$8 per sq ft ($800–$3,200 total); dustless sanding adds ~$2 per sq ft
Published national figures (This Old House, checked Aug 2026): https://www.thisoldhouse.com/flooring/reviews/cost-to-refinish-hardwood-floors. Prices move — the free planner pulls current retail prices for your exact repair.

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Frequently asked questions

Do I need a permit for refinishing a hardwood floor in Orange County, FL?

No permit. Floor covering is named in the exempt cosmetic class — sanding and refinishing what is already there is finish work. The dust containment and finish fumes deserve more planning than the paperwork does.

Are there specific building-code requirements for refinishing a hardwood floor?

Permit: unincorporated Orange County lists 'installation or replacement of finished floor covering' among minor repairs needing NO permit.

What does refinishing a hardwood floor cost?

DIY: $500–$1,000 total for DIY rentals and materials; drum sander rents for $50–$80 per day (edger $35–$45/day, belt sander $15–$25/day) Hiring it out: $3–$8 per sq ft professionally refinished, ~$1,800 average total project (single bedroom $300–$800) Typical range corroborates at $2–$8 per sq ft ($800–$3,200 total); dustless sanding adds ~$2 per sq ft Published national figures (This Old House, checked Aug 2026) — local prices vary, and the free DIYrr planner pulls current retail prices for your exact repair.

Related repairs

Sources

https://nwfa.org/wp-content/uploads/2022/09/HFM_AugSept22_final_refinishable_small.pdf
https://www.bona.com/globalassets/catalogassets/tds-bona-traffic-hd-us-enus_20260527131533.pdf
https://woodfloors.org/problem-prevention/
https://www.minwax.com/en/products/stains/wood-finish
https://www.orangecountyfl.net/PermitsLicenses/DivisionOfBuildingSafety.aspx

This guide is general informational content, not professional or legal advice. Codes and county rules change — confirm permit requirements with your local building department, and use a licensed professional for electrical, gas, structural, or main-line plumbing work.

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