How much does it cost to build a 12x18 shed?
About $5,561 to $6,217 in materials for a 12x18 shed (216 square feet, also written 18x12), or $25.75 to $28.78 per square foot. The figures are our plans engine's priced materials list for this exact size, framing to roofing.
12x18 gable shed: $5,561 to $6,217
| Siding and roofing | Materials | Per sq ft |
|---|---|---|
| LP SmartSide siding, asphalt shingles | $5,561 | $25.75 |
| LP SmartSide siding, metal roof | $5,702 | $26.40 |
| T1-11 siding, asphalt shingles | $5,819 | $26.94 |
| T1-11 siding, metal roof | $5,960 | $27.59 |
| Board and batten siding, asphalt shingles | $6,076 | $28.13 |
| Board and batten siding, metal roof | $6,217 | $28.78 |
Where the money goes (LP SmartSide siding and asphalt shingles)
| Part | Cost | Share |
|---|---|---|
| Plywood, OSB and siding panels | $1,904 | 34% |
| Framing lumber | $1,383 | 25% |
| Roofing | $657 | 12% |
| Nails, screws and fasteners | $591 | 11% |
| Trim and finishing | $460 | 8% |
| Foundation (skids, blocks, gravel) | $292 | 5% |
| Door and window parts | $216 | 4% |
| Hardware | $59 | 1% |
Optional extras the plan lists but leaves out of the total come to about $44 more.
12x18 Gable Shed plans: cut list, drawings and the full materials list · Price your own options in the free calculator
What isn't in the price
Not included: sales tax, delivery, paint or stain, a permit if your town needs one, tools, and labor if you hire a builder. Prices are typical US big-box shelf prices for 2025-26 and move up or down by about a third with region and season, so check your local store before you buy.
Similar sizes
- What a 12x16 shed costs to build (192 sq ft)
- What a 10x20 shed costs to build (200 sq ft)
- What a 14x16 shed costs to build (224 sq ft)
- What a 12x20 shed costs to build (240 sq ft)
Questions
How much does it cost to build a 12x18 shed?
About $5,561 to $6,217 in materials at typical US big-box prices, depending on the roof style, siding and roofing you choose: $25.75 to $28.78 per square foot of floor. Tax, delivery, paint and labor are extra.
What makes a 12x18 shed cost more?
Siding and roofing move the price most. For the gable version, LP SmartSide siding and asphalt shingles is cheapest and board and batten siding and a metal roof costs $656 more.
Is an 18x12 shed the same price?
Yes: an 18x12 shed has the same 216 square feet, and the materials are the same whichever way round you write it.
The plans are a guide: check local codes, and your building department, before you build.