How long does a shed last?
Updated August 2026
A shed lasts 15–30 years, and the material sets the range: wood and metal sheds run 15–20 years, while resin (plastic) sheds reach 20–30. But the walls are rarely what fail. What decides a shed's life is its base and its roof: a shed set on a dry gravel or concrete pad can outlive one dropped on bare dirt by 5–10 years, and a roof left to leak will rot the framing from the inside in a season or two. Get those two right and even a mid-range shed reaches the far end of the range.
Lifespan by type and situation
| Type or situation | Typical lifespan | Why |
|---|---|---|
| Wood shed | 15–20 years | Looks best, but rots at the base and needs sealing or paint |
| Metal (steel or aluminum) shed | 15–20 years | Rusts at the panel seams and the floor track |
| Resin / vinyl (plastic) shed | 20–30 years | Will not rot or rust; UV fade is the main aging |
| On a gravel or concrete pad | Top of the range | A dry, level base is the single biggest life extender |
| Set on bare dirt | Cut 5–10 years | Ground moisture wicks up and rots or rusts the floor and walls |
| Roof left unmaintained | Cut 3–7 years | A small leak destroys the interior and framing fast |
Signs yours is near the end
- Doors that stick, sag, or no longer latch as the frame racks out of square
- Soft, spongy, or discolored wood at the base trim, sill plate, or floor
- Rust blooming along metal seams, fasteners, or the bottom track
- A sagging or leaking roof, water stains inside, or daylight through the sheathing
- A musty smell, mildew on the walls, or standing water on the floor after rain
- Walls bowing outward or pulling away from the roofline
How to add years
A shed lives or dies at its base and its roof. Set it on a level gravel bed or concrete pad, never bare soil, and keep grading and downspouts sending water away from it; a dry foundation alone can add 5–10 years. Reshingle or reseal the roof before a small leak soaks the framing, clear leaves off it each fall, and on a wood shed re-stain or repaint every 3–5 years to keep moisture out of the siding. Trim back branches that drop debris and trap humidity against the walls. Our shed maintenance checklist lays out the seasonal tasks, and the whole-home maintenance checklist folds them into your yearly rounds.
What it costs to replace: plan on $2,000–8,000 installed. Replacing on your own schedule, before it fails, is almost always cheaper than the emergency version. The home maintenance cost calculator helps you set the money aside before it comes due.
OnOtto tracks your shed roof checks age and service history, and warns you before end of life instead of after the flood.
Track your home's systems, free for 30 daysFrequently asked questions
What kind of shed lasts the longest?
Resin and vinyl sheds, at 20–30 years, because plastic cannot rot or rust and shrugs off moisture. The trade-off is a plainer look and eventual UV fading. Wood sheds (15–20 years) look best and are easy to modify, but demand sealing and rot control. Metal sheds (15–20 years) are cheap and fireproof but rust at the seams and dent easily. Whatever the material, a dry and level foundation moves the lifespan more than the walls do, so budget for a proper base first.
Does a shed need a foundation?
For any shed you want to last, yes. Setting one directly on dirt or grass is the fastest way to rot a wood floor or rust a metal one, and it lets the structure settle and rack out of square. A gravel pad 4–6 inches deep, a set of concrete blocks or piers, or a poured slab all keep the floor dry and level. The base typically adds $300–1,500 to a project but can add 5–10 years to the shed, making it some of the best money you spend.
When is a shed worth replacing instead of repairing?
Once the framing or floor has rotted, the roof structure sags, or the walls have pulled out of square, repairs stop being cost-effective. Patching siding, reshingling, or fixing a door on an otherwise sound shed is worth it. But when the base is gone you are rebuilding the shed anyway. A new shed runs $2,000–8,000 installed depending on size and material, so weigh a major structural repair against that number and the shed's age before you commit.
How do I keep a wood shed from rotting?
Keep water off it and away from it. Stand it on a dry gravel or concrete base so the floor never touches soil, seal or paint the siding and trim every 3–5 years, and make sure the roof sheds cleanly and the ground slopes away from all four walls. Add a small gutter if runoff pools at the base. Clear leaves and snow off the roof, and cut back any plants touching the walls so air can dry the wood after rain.