How often should you reseal wood siding?
Updated July 2026
Re-stain or reseal wood and cedar siding every 3–7 years, with the exact interval set by the finish and the exposure. Clear and transparent sealers wear off fastest and need renewing every 2–3 years; semi-transparent stains go 3–5 years; solid-color stains and paint hold 5–10 years. The rule of thumb is simpler than the calendar: when water stops beading and soaks in instead, the finish is gone and the wood is unprotected.
What changes the interval
| Your situation | Interval | Why |
|---|---|---|
| Clear or transparent sealer | Every 2–3 years | Little pigment means little UV protection, so it wears off quickly |
| Semi-transparent stain | Every 3–5 years | Some pigment shields the wood and shows the grain, a middle ground |
| Solid-color stain | Every 5–7 years | Heavy pigment blocks UV best and lasts the longest of the stains |
| Paint on wood siding | Every 7–10 years | A film finish lasts longest but peels rather than fading when it fails |
| South and west sun exposure | At the short end | UV is the main enemy of any finish, and these faces get the most |
| Water no longer beading up | Reseal now | That is the clearest signal the protective layer has worn through |
The cost of skipping it
What skipping it costs: bare wood is a sponge. Once the finish wears through, the boards drink up rain, then cup, split, and grow gray mildew, and eventually the sun-facing and ground-level courses rot. A re-stain runs $1,500–5,000 for a house (roughly $1–3 per square foot); let it go and you are replacing boards at $5–12 per linear foot or re-siding entirely. Refinishing on a 3–7 year rhythm costs a fraction of what one rotted wall does.
How to do it (Weekend DIY per elevation, or a pro repaint)
- Test the finish: flick water at the siding. If it beads, you are fine; if it soaks in, it is time to reseal.
- Wash the walls to remove dirt, mildew, and chalk, and let the wood dry for a few days before finishing.
- Scrape and sand any peeling finish or rough grain, and spot-prime bare wood if you are using solid stain or paint.
- Replace any board that is soft, split, or rotted before finishing over it; sealer will not save bad wood.
- Apply stain or sealer with the grain on a dry, mild day, keeping a wet edge to avoid lap marks.
- Pay extra attention to the bottom edges, end grain, and butt joints, where water gets in first.
Knowing the interval is the easy half. OnOtto reminds you at the right interval, and it won't let you snooze it into next year. Tasks persist until they're done, and completing wood siding sealing schedules the next one automatically.
Put this on autopilot, free for 30 daysFrequently asked questions
Should I use a clear sealer, stain, or paint on wood siding?
It is a trade-off between showing the wood and lasting longer. Clear sealers keep cedar looking natural but need redoing every 2–3 years. Semi-transparent stains add some pigment and UV protection for 3–5 years while still showing grain. Solid stains and paint hide the wood but protect it longest, 5–10 years. Pigment is what blocks UV, so the more color you accept, the fewer times you are up a ladder.
How do I know it is time to reseal?
The water test is the honest answer: splash the siding and watch. Beading means the finish is still shedding water; soaking in means it has worn through and the wood is drinking. Back that up with your eyes, look for fading, a chalky surface, gray or greening boards, and any raised grain or early splitting. Any of those on the sun-facing walls means schedule the job this season.
Can I switch from stain to paint, or the reverse?
Stain over old paint does not work; the stain needs to penetrate bare or previously stained wood, and paint blocks it. Going from stain to paint is doable but a project: you strip or thoroughly prep the wood, prime it, then paint, and from then on you are on the paint maintenance cycle. It is easier to stay in the same family, so pick the finish you want to live with before the first refinish.
Does this overlap with repainting the rest of the exterior?
It can. If your trim, doors, and other surfaces are also due, folding the siding into one exterior repaint saves on setup, ladders, and labor. The catch is that wood siding on a 3–7 year clear-or-stain cycle usually comes due more often than trim paint, so many owners reseal the siding on its own faster rhythm and align the big repaint every second or third time.