Backyard shed maintenance checklist
Updated August 2026
Keeping a shed sound is mostly a yearly roof and sill inspection plus a wood-siding reseal every 2 to 3 years, all resting on a base that stays up off wet ground. Water is the only real enemy out here: a pinhole in the roof or a sill parked in a puddle will rot the floor and everything stored on it inside a season or two. Handle those and a wood shed lasts 15 to 20 years, a metal or resin one 20 to 30.
| Task | Interval | Effort |
|---|---|---|
| Walk the interior for water stains, mold, and pest signs | Spring and fall | 10 min · DIY |
| Clear leaves off the roof and out of any gutter | Spring and fall | 15 min · DIY |
| Task | Interval | Effort |
|---|---|---|
| Inspect the roof for lifted shingles or rusted panels | Yearly | 15 min · DIY |
| Reseal roof seams, ridge, and fastener heads | Yearly | $10–30 · DIY |
| Probe the sill and floor edge for soft, rotted wood | Yearly | 10 min · DIY |
| Regrade or add gravel so water drains away from the base | Yearly | $0–100 · DIY |
| Caulk gaps wider than 1/4 inch against rodents | Yearly | 30 min · DIY |
| Task | Interval | Effort |
|---|---|---|
| Restain or reseal wood siding and trim | 2–3 years | $50–150 · DIY |
| Touch up or repaint metal siding to stop rust | 2–3 years | $40–120 · DIY |
| Task | Interval | Effort |
|---|---|---|
| Reshingle or recoat the roof | 15–20 years | $300–1,500 · pro |
| Reset the shed on a level gravel or block base | As it settles | $200–600 · pro |
What neglect costs
One unpatched roof leak is all it takes: water tracks down to the floor, swells the OSB or plywood, and rots the sill plate the walls stand on. By the time the floor turns spongy you are looking at $500 to $2,000 in framing and floor repair, or a full teardown if the wall bases have gone too. A shed left on bare, wet soil wicks moisture up into the wood year-round and cuts its life in half. Sealing the roof and lifting the base onto gravel or blocks costs under $150 and protects both the structure and the tools inside, which for a stored mower or snow blower are often worth more than the shed itself.
Leave these to a pro
Sealing seams, caulking gaps, and restaining siding are all weekend DIY. Bring in a pro for the two structural jobs: a rotted sill or floor frame means lifting the wall and replacing the base member, roughly $300 to $900 depending on size, and reshingling or recoating the roof runs $300 to $1,500. If the whole building has racked out of square or sunk on one corner, a handyman can jack it, reset it on a level gravel or block pad, and re-square the door for $200 to $600, far cheaper than replacing a $2,000 to $5,000 shed.
This whole checklist ships as reminders in OnOtto: every task above, on the right schedule for your home, snooze-proof.
Load this checklist as remindersFrequently asked questions
How long does a backyard shed last?
A wood shed lasts 15 to 20 years, metal 20 to 30, and vinyl or resin often 20-plus, but only with upkeep and a dry base under it. Water decides it: a shed on a wet slab or bare soil with an unsealed roof can rot out in under 10. One on a raised gravel or block pad with a sealed roof and restained siding will beat the numbers above. The full breakdown by material lives on the shed lifespan page.
How do I keep mice and pests out of a shed?
Seal every gap wider than 1/4 inch, since a mouse can squeeze through a hole the size of a dime. Caulk around the door frame, pack steel wool into utility penetrations, and add a door sweep at the threshold. Keep the base up off the ground and clear a foot of vegetation around the perimeter so nesting cover disappears. Store seed, fertilizer, and pet food in sealed metal or hard-plastic bins rather than bags, which are the main attraction in the first place.
Does a shed roof need to be sealed every year?
Inspect it every year and reseal as needed, not necessarily a full recoat each time. On an asphalt-shingle shed, check for lifted or missing shingles and reseal exposed nail heads and the ridge. On a metal shed, retighten fasteners and dab sealant on any rusted or backed-out screws. A rolled or rubber roof wants a fresh coat every 2 to 3 years. Full reshingling comes around every 15 to 20 years, the same clock as a house roof scaled down.
Should a shed sit on the ground or on a base?
Never directly on soil. A shed needs a base that holds it 4 to 6 inches off grade so the floor and sill stay dry: a gravel pad, concrete blocks, pressure-treated skids, or a poured slab all work. Grade the surrounding ground so water sheds away from the shed, not toward it. A raised, drained base is the single biggest factor in how long the floor survives, and it keeps the door swinging square as the ground freezes and thaws.