A storage building is only as good as what it sits on. Get the base right and the doors line up, the floor stays dry and the building is still square in ten years. Get it wrong and you will be fighting sticking doors and a sagging floor within a season.
Here is how the common options actually compare, and what we recommend for most yards in central Virginia.
Why the base matters more than people expect
A shed is a rigid box. If one corner drops half an inch, the whole frame racks. Doors stop latching, trim opens up at the joints, and water starts finding its way in at the low corner. Almost every service call we make for a door that will not close traces back to the ground underneath, not the building.
The base has two jobs: keep the building level, and keep water moving away from the floor frame. Any option that does both will work. Options that do only one will not.
Gravel pad: the right answer for most yards
A compacted gravel pad is what we recommend for the large majority of buildings. It is cheaper than concrete, it drains, and it is far more forgiving than people expect.
What a good gravel pad looks like:
- Crushed stone, not smooth pea gravel. You want angular stone that locks together. Number 57 stone is the usual choice.
- Four to six inches deep, compacted in layers rather than dumped in one go.
- Extended about a foot past the building on every side, so runoff from the roof lands on stone instead of digging a trench beside the floor.
- Level across the whole pad. This is the part people underestimate. Eyeballing it is not enough.
The stone lets water drain straight through instead of pooling under the floor joists, which is exactly what rots a floor frame from below.
Concrete slab: excellent, and usually more than you need
A poured slab is the most permanent option and the right call if you are putting in a garage, parking anything heavy inside, or planning to run the building as a workshop for decades.
The trade-offs are cost and permanence. A slab costs considerably more than gravel, it takes time to cure before delivery, and it is not going anywhere if you later decide the building would be better in the other corner of the yard. For a standard storage building, most customers are better served putting that money into a larger building on gravel.
Concrete blocks and runners
Solid concrete blocks under the floor runners are a long-standing method and they work, but only when the ground under them is stable and the blocks are set properly. On soft or clay-heavy ground, blocks sink unevenly over a few wet seasons and you are back to a racked frame.
If you go this route, set the blocks on undisturbed or compacted ground rather than loose fill, and do not stack them more than a couple high on the low side. A tall stack of blocks holding up one corner is a sign the site needed grading rather than shimming.
Bare ground: not a foundation
Setting a building straight onto grass or dirt is the one option we would talk you out of. Grass holds moisture against the floor frame, the ground shifts as it takes on and sheds water, and there is nothing letting the underside dry out. It is the fastest route to a floor that fails early, and it is usually not covered as a warranty issue because the cause is the site rather than the building.
What about uneven ground?
Most yards are not flat, and that is fine. The question is how much fall there is across the footprint. A few inches can be handled by building the pad up on the low side. Once you are past roughly a foot of drop across the length of the building, you are into grading or a retaining edge, and it is worth having someone look at it before you order.
Do not try to solve a sloped site with a taller stack of blocks under one end. Fix the ground, not the building.
How big should the pad be?
Match the pad to the building and add a foot on each side. For a 10×12 building, that means a 12×14 pad. The extra stone gives you a dry place to stand while you open the doors and keeps roof runoff off the frame.
One more thing worth planning: leave yourself a clear path to the doors. A beautiful pad that you have to cross a mud patch to reach gets old quickly.
What we handle for you
Every building we deliver is set level as part of delivery and setup, which is free within 50 miles of our North Dinwiddie and Charles City locations. Buildings settle a little in their first year as the ground adjusts, so one free relevel in the first year is included as well.
If your site needs work before the building arrives, our site prep crew can grade and build the pad for you. If you would rather do it yourself, call us with your building size and we will tell you exactly what to prepare and how much clearance the delivery truck needs.
Not sure what your yard needs? Send us a photo through the contact page or call the location nearest you. We would rather spend ten minutes on the phone now than fix a leaning building later.
