How Much Paint for a Shed?
The short answer: 2 gallons for an 8x10 shed. Rough timber takes far more paint than the can promises.
An 8x10 shed with 7-foot walls needs about 2 gallons of paint for two coats. That assumes one door and rough-sawn or weathered timber cladding. If your shed is smooth planed or already painted, use the 350 sq ft setting and 1 gallon may be enough.
Estimates only. Textured walls, high ceilings, sprayers and major colour changes can all increase the amount you need. Always buy slightly more than the calculation suggests.
Paint needed by shed size
| Room / surface | Surface | Coats | Paint | Paint cost |
|---|---|---|---|---|
| Small shed, 6x8, rough timber | 175 sq ft | 2 | 2 gal | $84 |
| Standard shed, 8x10, rough timber | 231 sq ft | 2 | 2 gal | $84 |
| Standard shed, 8x10, smooth cladding | 231 sq ft | 2 | 2 gal | $84 |
| Large shed, 10x12, rough timber | 287 sq ft | 2 | 2 gal | $84 |
| Standard shed with roof and trim | 311 sq ft | 2 | 3 gal | $126 |
Walls only, two coats, one door. The 300 sq ft setting reflects rough or weathered timber; the 350 setting is for smooth, previously painted cladding.
Shed cladding drinks paint
Sheds are usually built from the cheapest available timber, and that timber is rough. Rough-sawn boards have a far greater surface area than their flat dimensions suggest — every saw mark is extra surface for the paint to fill.
The coverage figure on the can is measured on smooth, sealed surfaces. On bare shed cladding expect:
- Rough sawn, new: 200 to 250 square feet per gallon.
- Weathered and grey: 250 to 300.
- Already painted or smooth planed: 350 to 400.
The calculator above uses 300 as a middle figure. If your shed is bare, rough timber that has never been finished, use 250 — and consider buying a 5-gallon bucket, which is usually cheaper per gallon than individual cans and gives you plenty of margin.
Do not forget the parts that are not walls
The four walls are the obvious job. They are rarely the whole job:
- Trim and fascias: roughly 50 to 80 linear feet around a standard shed. That is 25 to 40 square feet.
- Door and frame: one side of a standard door plus the frame is about 25 square feet.
- The roof, if it is felt or shingle: not paintable, but if it is timber or metal it may need a different product entirely.
- The inside: if you are lining and painting the interior, that is a separate calculation of the same size.
Stain or paint on a shed?
Both work, with different trade-offs:
- Stain soaks in, never peels, and is much easier to refresh. On rough timber it is usually the better choice, and it hides the uneven surface rather than highlighting it.
- Paint gives a solid colour and a tidier finish, but on rough timber it sits on the peaks of the grain and can crack as the wood moves with the seasons.
Either way, the timber needs to be dry. Applying finish to damp wood traps the moisture and the coating fails from underneath — the most common reason a shed paint job looks bad within a year.
Frequently asked questions
How much paint for an 8x10 shed?
About 2 gallons for two coats on rough timber. If the cladding is smooth or already painted, 1 gallon may be enough.
How much does a gallon of paint cover on rough wood?
200 to 250 square feet per gallon on bare rough-sawn timber, against 350 to 400 on a smooth surface. Rough wood can nearly double the paint you need.
Should I stain or paint a shed?
Stain is usually better on rough timber. It penetrates rather than forming a film, so it never peels and it hides the uneven grain instead of highlighting it.
Do I need to prime a new shed?
Yes on bare timber. A wood primer seals the surface and can save you an entire topcoat, which usually costs less than the extra paint would.