Shed Cost Calculator

Shed pricing hides a lot of variation behind one small number

Shed cost estimates online swing wildly — a few thousand dollars to well over ten thousand for what looks like the same 10x12 footprint — because a “shed” covers everything from a flat-pack resin kit assembled in an afternoon to a fully framed, sided, insulated outbuilding with real windows and a proper foundation. This calculator doesn’t try to guess which one you mean; it prices your specific shell rate, floor rate and add-ons, so the result reflects the actual shed you’re planning rather than a generic national average that doesn’t match either extreme.

Shell rate: the number that does the most work

The shell rate per square foot — covering framing, siding, roofing and trim — is where most of a shed’s cost lives, and it’s also where “shed” prices vary most. A basic vinyl or resin kit shell can run under $20/sq ft; a wood-framed shed with real siding, a shingled roof and trim detailing commonly runs $35-$60/sq ft or more depending on materials and region. Get an actual quote or kit price for your specific shed before relying on a rough number here — this line item alone explains most of the spread between a budget shed and a nicer one of the same size.

Foundation: often skipped in DIY estimates, rarely skippable in practice

A shed foundation isn’t just about looks — it keeps the structure off wet ground (preventing rot at the base of wood framing), keeps it level over time, and in some jurisdictions is a permitting requirement above certain sizes. A gravel pad or pressure-treated skid foundation is the budget option and adequate for most small, unpowered sheds. Anything larger, with electrical service, or intended for heavier use (a workshop with tools and equipment) more often warrants a proper concrete slab — both because it’s sturdier and because some codes specifically require it once electrical service enters the structure. Don’t skip this line item when budgeting; an otherwise well-built shed set directly on dirt or an inadequate pad is a common source of early rot and settling.

The permit question people skip, and sometimes regret

Whether a shed needs a permit depends entirely on your local jurisdiction and the shed’s size — many places set an exemption threshold (often 100-200 square feet) below which no permit is required, but require one above it, and some require a permit regardless of size once electrical or plumbing is involved. This is genuinely worth checking before building rather than assuming: an unpermitted structure over your local threshold can surface as a problem at resale, when a buyer’s inspector or the county’s own records flag square footage that was never permitted.

What this calculator doesn’t price

This tool estimates the shed structure itself — it doesn’t include site grading beyond a basic delivery/prep allowance, landscaping around the new shed, or electrical service if you’re running power to it, which is its own separate trenching-and-wiring cost best quoted directly by an electrician. For a shed large enough to function as a workshop, guest space, or garage alternative, also compare against the post-frame building calculator and building cost calculator, which price larger structures with a fuller breakdown of shell, slab, insulation and labor.