The Shed
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DIY Shed Cost Calculator Guide
Price a shed the way you'd actually build it — foundation, floor, walls, roof, openings — instead of guessing at a total.
Every price here is a starting point you should overwrite, not a quote. Material and labour costs vary by region, by supplier and by month, and anything published today is stale by next quarter. Put your own quoted numbers in and the arithmetic will be right; leave the defaults and you will get a rough order of magnitude, nothing more.
Check the Permit Threshold First
Most jurisdictions let you build a shed under a certain floor area without a permit, and the number is often around 100–120 sq ft — but it varies, and some places also regulate height, setback from the boundary, and whether it sits on a permanent foundation.
That threshold quietly shapes the design. A 10×10 and a 10×12 can be on opposite sides of a rule, which is worth ten minutes on your local planning site before you order anything.
The Foundation Decides How Long It Lasts
A shed sitting directly on soil rots. The three usual answers are a gravel pad, treated skids, or a concrete slab, in ascending order of cost and permanence.
Gravel drains and is cheap. Skids let you move it later and, in many places, keep it classified as a temporary structure. A slab lasts longest and is the one most likely to trip a permit requirement, because a permanent foundation is often exactly what the rule keys on.
Walls Are Priced by Wall Area, Not Floor Area
This catches people. A 10×12 shed with 8ft walls has 120 sq ft of floor but 352 sq ft of wall. The walls are the bigger surface, and they're framed, sheathed and sided — so they're usually the largest single line.
Raising the wall height from 7ft to 8ft adds 44 sq ft of wall to that shed and costs real money, which is worth knowing before you decide you want to stand up comfortably.
Buying Beats Building Below a Certain Size
This is the uncomfortable one. Small prefab sheds are made in volume with machine-cut parts and thin material, and below roughly 8×10 the kit is often cheaper than your material list — before you've spent a single weekend on it.
DIY wins on larger sheds, on quality, and when you want something specific. It rarely wins on price for a small basic box. Run your numbers against a kit before committing.
What This Doesn't Include
Permits, site clearing and levelling, electrical, insulation, shelving, or delivery of materials. Levelling in particular can be a serious line if the ground slopes.
Related: framing calculator, gravel calculator for the pad, metal roofing calculator.
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