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ShedCalc
Free & unbiased — we don't sell sheds

Shed Cost Estimator

See what your shed should cost, exactly what to buy, and which design changes would save you the most — ranked by how much they actually move the number.

  • Build-vs-buy comparison
  • Every assumption shown

Your shed

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You'll get a realistic price range, the exact materials to buy, and a ranked list of the changes that would save you the most money.

Costing a shed honestly

What it really costs to build a shed

And why any calculator promising one exact number is guessing.

Why we show a range, not a price

Most shed cost calculators hand you a confident figure. It looks authoritative and it's almost always wrong, because lumber, sheet goods and roofing are priced differently by region, supplier and season — and they move constantly.

We also separate two figures that get carelessly mixed together. DIY materials — roughly $20–$35 per square foot — is a reasonably predictable number, because lumber and sheet goods don't vary that wildly. A finished build with hired labour and an insulated, wired interior can be many times that. Quoting one figure for both is how cost guides end up with ranges so wide they're useless.

Beyond that, we lead with the things that are actually knowable. Your quantities are calculated exactly, using the same framing engine as our Material Calculator. The opening range is quoted from published cost guides and credited to them. And the cost-driver percentages come straight from the quantities, so they're true whatever lumber costs where you live.

What we won't do is publish invented default prices. We can't verify what a 2×4 costs at your supplier this month, and a made-up national average would only make the tool look precise. Enter your own prices and you'll get a figure that's genuinely yours.

Percentages beat prices

Here's the part most cost calculators miss. You rarely need to know the exact price of a shed — you need to know whether dropping two feet of length, flattening the roof or widening the stud spacing is worth it.

Those answers don't need prices at all. Because we know your exact material counts, we can show what each change does to your material bill as a percentage — and a percentage doesn't go stale, doesn't vary by region, and doesn't depend on which supplier you use. That's the most reliable number on this page, and it's the one you can actually act on.

The five things that drive shed cost

  1. 1. Size. Floor area drives foundation, roof and siding all at once — the single biggest lever. Size to what you'll actually store using the Size Calculator.
  2. 2. Foundation. A gravel pad is a fraction of a concrete slab, and the floor you build on top changes the sum again — see does a shed need a floor.
  3. 3. The envelope. Siding, sheathing and roofing are usually the largest material block in a DIY build.
  4. 4. Openings and finish. Every door and window adds framing, the unit itself and weatherproofing. Insulating and finishing an interior can cost as much again.
  5. 5. Labour. If you hire out, labour often becomes the biggest line on the whole project.

Build or buy? Use the comparison

The most useful thing you can do with a cost estimate is hold it up against a real quote. Price your materials, paste a kit or prefab price into the comparison box, and you'll see immediately which way round the saving falls.

Remember the comparison isn't purely financial — a kit buys you time and predictability, while building buys you control over size, quality and layout. Our guide to shed kits vs building from scratch covers that trade-off properly. Since we don't sell sheds or kits, we have no stake in which way you go.

Where to save — and where not to

Sensible savings come from smaller footprints, simpler rooflines, designing to standard sheet sizes, and doing the labour yourself. Our budget shed ideas cover the tactics that save the most — salvaged materials, sizing to standard sheets, and knowing which corners are safe to cut.

The false economies are always the same four: the foundation, the roof, pressure-treated lumber near the ground, and fasteners. Those decide whether the shed lasts, and they're the most expensive things to put right later.

What this estimate deliberately leaves out

Your own time, tools you don't already own, delivery charges, permit and inspection fees, site clearing or levelling, and interior work like electrics and insulation. These vary so much by person and place that including them would make the estimate less honest, not more. Budget for them separately — and check permit requirements locally before you build (see our disclaimer).

Questions

Shed cost FAQ

Straight answers on pricing, accuracy, and build-versus-buy.

How much does it cost to build a shed?
Published US cost guides put DIY materials at roughly $20–$35 per square foot, so a 10×12 shed (120 sq ft) typically costs about $2,400–$4,200 in materials if you do the work yourself. A finished build with hired labour, insulation and interior work runs far higher — commonly $25–$200 per square foot depending on finish level. Those are third-party figures; enter your own supplier prices in the calculator for a number that reflects your area.
Why does this show a range instead of one price?
Because a single number would be false precision. Material prices differ between suppliers, regions and months, so any calculator claiming to know what a shed costs where you live is guessing. We show two ranges because they answer different questions — DIY materials, which is the tighter and more predictable figure, and a finished build including labour, which varies enormously with finish level. Enter your own supplier prices to narrow either one to an exact total.
How accurate is this shed cost calculator?
The quantities are exact: they come from the same framing engine as our Material Calculator, built on standard construction practice with a 10% waste allowance. The cost-driver percentages are calculated from those quantities, so they hold true regardless of local prices. The only uncertain part is what materials cost near you — which is why the tool asks you rather than inventing a figure.
Why doesn't the calculator include default prices?
Because we can't verify what materials cost in your area, and publishing a made-up national average would make the tool look precise while making it less true. Instead you get quantities that are exact, percentages that are exact, and an optional field for your own prices. Enter what you can and the total builds up as you go.
Which changes save the most money on a shed?
Footprint is by far the biggest lever, because floor area drives framing, sheeting, roofing and foundation together. After that come roof pitch, wall height and stud spacing. The calculator ranks these for your specific design and shows the percentage each one would change your material bill, so you can see the trade-offs before you buy anything.
Is it cheaper to build a shed or buy one?
Building from raw materials is usually cheaper on materials alone, since you aren't paying a manufacturer's margin, packaging and delivery. Whether it's cheaper overall depends on whether you count your time and need to buy tools. Enter a kit or prefab quote into the comparison box and you'll see how your build stacks up against it.
What's the biggest cost in a shed build?
For a DIY build it's usually the envelope — siding, sheathing and roofing — followed by framing lumber. If you hire labour, labour typically becomes the single largest line and can rival everything else combined. Foundation cost swings widely too: a gravel pad is a fraction of a concrete slab.
Does a bigger shed cost proportionally more?
Roughly, but not exactly. Floor area drives foundation, roofing and siding, so cost rises steadily with size. However, doors, windows and fixed setup costs don't scale, so cost per square foot often falls slightly as sheds get bigger. Sizing up is usually cheaper per square foot than building a second shed later.
Should I include labour in the estimate?
Only if you're hiring out the work. Labour rates vary more than any material and depend heavily on your area and the builder, so treat that line as the roughest part of the estimate. For a DIY build, leave it off — your cost is materials plus your weekends.
Do permits and delivery add to the cost?
They can, and they're not included here. Permit fees vary by jurisdiction, delivery charges depend on your supplier and distance, and site preparation depends on your ground. Ask your local building department about fees and your supplier about delivery before finalising a budget.

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