Why use a gravel pad for a shed?
Short answer: drainage and a level base. Water dripping off the eaves soaks into the stone instead of splashing mud onto the walls, which helps the building last1.
- Less rot at the bottom: a wider pad cuts down on water splashing up against the siding2.
- Level floor: doors and windows stay square when the floor is level.
- Drainage under the building: Craven County's permit form notes that the NC building code calls for positive drainage from beneath and away from buildings4.
- Sandy coastal lots: gravel gives a firmer bed than loose sand or wet clay. Tell the builder about standing water on the first call.
How much bigger than the shed should a gravel pad be?
Short answer: larger than the footprint on every side. The two guides we cite differ: one says 1 foot larger overall1, the other 12 inches wider on every side2.
| Guide | Rule | Its example |
|---|---|---|
| Shed maker's site prep guide1 | 1 ft larger than the shed | 10x14 shed, pad at least 11x15 |
| Site-prep company guide2 | 12 in. wider on every side | 8x12 shed, 10x14 pad |
A concrete base is different: the same site-prep guide says a concrete shed base should be the same size as the shed2. Ask the seller or builder which spec they want for your building.
How deep should a gravel pad be, and what stone should you use?
Short answer: about 3 to 6 inches of compacted crushed stone, depending on the guide and your soil1,2.
- Clear the spot: remove the sod from an area slightly larger than the pad1.
- Level it: dig out high spots rather than filling low ones with loose soil1.
- Spread the stone: 3/4-inch crushed stone, 3 to 4 inches deep in one maker's guide1; 4 to 6 inches in the site-prep guide2.
- Tamp it: compact the stone until it is flat and level1.
- Frame it (optional): a border of pressure-treated 4x4s or block holds the stone in place but isn't required1.
How do you keep water away from a shed pad?
Short answer: put the pad on the high side of the yard, make it wider than the roof's drip line, and let the ground around it slope away.
- Pick the spot: avoid low corners where water stands after a storm.
- Mind the drip line: a pad wider than the shed catches roof runoff, especially without gutters1.
- Slope away: the ground should carry water away from the building4.
- Flood zones: New Hanover County requires an elevation certificate for structures on flood-zone property5.
What are the other shed foundation options?
Short answer: gravel pads, concrete blocks or piers, and concrete slabs. Small sheds often sit on gravel or blocks; large sheds and garages are often built on a slab.
- Gravel pad: drains well and suits skid-built and on-site sheds.
- Blocks or piers: solid blocks or composite footings under the floor frame, useful on slopes. Some towns require concrete piers with or without tie-downs1.
- Concrete slab: common for big sheds, workshops and garages, usually under a building permit.
- The code allowance: up to 400 sq. ft. and one story, an accessory building may sit on a wood mudsill of at least 2x6 or 3x4 without a masonry or concrete foundation, with a ground anchor at each corner, except in coastal high hazard or ocean hazard areas3.
- Permitted sheds: New Hanover County asks for a tie-down or foundation plan when the design requires one5. See hurricane anchors and footings.
What do people ask about gravel pads for sheds?
How big should a gravel pad for a shed be?
Bigger than the shed. One shed maker recommends a pad 1 foot larger than the shed, for example 11x15 for a 10x14 building1. A site-prep company recommends 12 inches wider on every side, for example 10x14 for an 8x12 shed2. Ask your shed seller or builder which they want.
How deep should a gravel pad be?
The two guides we cite say 3 to 4 inches1 and 4 to 6 inches2. Deeper helps on soft or poorly drained ground.
What gravel is used for a shed pad?
Crushed stone. One shed maker recommends a level pad of 3/4-inch crushed stone1.
Does a shed need a concrete foundation in NC?
Not always. The NC Residential Code lets an accessory building up to 400 sq. ft. and one story sit without a masonry or concrete foundation on a wood mudsill, with at least one ground anchor at each corner, except in coastal high hazard or ocean hazard areas3.
Why put a shed on gravel instead of on the ground?
Drainage. Gravel lets rain dripping off the roof soak away instead of splashing mud onto the walls1, and it keeps the floor frame off wet soil.
What else should you read before you call?
Want a builder to look at your shed spot?
Call (910) 763-7991 or send the short form. A local shed builder calls you back to talk through size, site and price for your Wilmington shed.
Where does this information come from?
- Horizon Structures, Site Preparation Guidelines for Storage Sheds, Gazebos and Kennels (manufacturer install guide). Accessed November 3, 2026.
- SitePrep, Why Your Gravel Shed Foundation Should Be 12 Inches Wider than Your Shed (shed site-prep contractor guide). Accessed November 3, 2026.
- North Carolina Residential Code, 2018 edition, Sections R101.2.1 and R101.2.2 (accessory buildings and structures), ICC free view. Accessed November 3, 2026.
- Craven County Inspections Department, Permit Application (PDF, revised June 2, 2025). Accessed November 3, 2026.
- New Hanover County, Residential Build: Shed/Detached Garage (permit checklist PDF). Accessed November 1, 2026.