12x18 Gable Shed Plans
A 12x18 gable shed gives you 216 square feet of storage and costs from $5,561 in materials. The plans for this exact size: every cut, every board to buy, 16 build steps in 3D and printable drawings.
What you get
What's inside the 12x18 plans
Part of the plan the designer makes for this 12x18 gable shed: the framing drawing of the front wall, the start of the cut list and the build steps. Change the door, windows, roof or any dimension and every number, cut and drawing is calculated again.
From the cut list
| Qty | Stock | Length | Used for |
|---|---|---|---|
| 2 | PT 4x6 | PT 4x6 @ 136" | Skid (PT 4x6 on edge, ground-contact rated) |
| 1 | PT 4x6 | PT 4x6 @ 128" | Skid (PT 4x6 on edge, ground-contact rated) |
| 1 | PT 4x6 | PT 4x6 @ 88" | Skid (PT 4x6 on edge, ground-contact rated) |
| 2 | PT 4x6 | PT 4x6 @ 80" | Skid (PT 4x6 on edge, ground-contact rated) |
| 15 | PT 2x6 | PT 2x6 @ 141" | Band joist (front/back), Floor joist @ 16" o.c. |
| 2 | PT 2x6 | PT 2x6 @ 112" | Rim joist |
…and 46 more lines, with the angle of every cut, plus a board-by-board cutting plan.
16 build steps, each shown in 3D
- Prepare the site
- Set the skids
- Build the floor frame
- Lay the floor
- Frame the back wall
- Frame the front wall
- Frame the side walls
- Raise and tie the walls
- Frame the roof
- Fascia and barge rafters
- Sheath the roof
- Shingle the roof
- Install the siding
- Trim
- Door and windows
- Paint and finish
Plus the full shopping list with estimated prices, sheet layouts and printable framing drawings for every wall, the floor and a full-size rafter template.
Materials list
The free shopping list for this 12x18 gable shed as shown, with LP SmartSide siding and asphalt shingles: $5,561. 51 items, 179 boards and 36 sheets.
| Item | Qty | Est. |
|---|---|---|
| PT 4x6 x 14' Pressure-treated, ground-contact (UC4A) rated. |
1 board | $36 |
| PT 4x6 x 12' Pressure-treated, ground-contact (UC4A) rated. |
3 boards | $94 |
| PT 4x6 x 8' Pressure-treated, ground-contact (UC4A) rated. |
1 board | $21 |
| PT 2x6 x 14' Pressure-treated, ground-contact (UC4A) rated. |
6 boards | $92 |
| PT 2x6 x 12' Pressure-treated, ground-contact (UC4A) rated. |
9 boards | $119 |
| PT 2x6 x 10' Pressure-treated, ground-contact (UC4A) rated. |
4 boards | $44 |
| 2x10 x 12' | 1 board | $19 |
| 2x8 x 10' | 6 boards | $72 |
| 2x6 x 12' | 7 boards | $71 |
| 2x6 x 10' | 1 board | $9 |
| 2x6 x 8' | 26 boards | $177 |
| 2x4 x 14' | 8 boards | $65 |
| 2x4 x 12' | 17 boards | $118 |
| 2x4 x 92-5/8" precut stud | 72 boards | $287 |
| 1x4 x 12' | 4 boards | $46 |
| 1x4 x 10' | 8 boards | $76 |
| 1x4 x 8' | 5 boards | $38 |
| 23/32" T&G plywood subfloor (Sturd-I-Floor) 4x8 216 sq ft net |
7 sheets | $406 |
| 15/32" CDX plywood roof sheathing 4x8 281.5 sq ft net |
10 sheets | $340 |
| LP SmartSide 38 Series panel 3/8" 4x9 (8" o.c. grooves) 518.7 sq ft net |
17 sheets | $1,054 |
| LP SmartSide 38 Series panel 3/8" 4x8 (8" o.c. grooves) 33.7 sq ft net |
2 sheets | $104 |
| 3/4" crushed stone, bulk (delivered) 4" compacted pad, 12" past the shed on every side (+15% for compaction) |
4 cu yd | $220 |
| Auger ground anchor 30" with strap One at each corner, strapped to the rim joist: a shed on skids can slide or lift in high wind |
4 each | $72 |
| Aluminum drip edge 10 ft Eaves under the underlayment, rakes over it |
7 pieces | $67 |
| Architectural asphalt shingles (3 bundles = 1 square) 281 sq ft of roof + 10% waste |
10 bundles | $420 |
| Shingle starter strip (~100 lin ft) | 1 bundle | $48 |
| Hip & ridge cap shingles (~33 lin ft) | 1 bundle | $68 |
| #15 felt underlayment roll (~400 sq ft) | 1 roll | $30 |
| 1" plastic cap nails (box of 2,000) | 1 box | $24 |
| 1-1/4" galvanized roofing nails 5 lb 4 nails per shingle (6 in high-wind areas) |
2 boxes | $34 |
| 16d (3-1/2") galvanized framing nails 5 lb (~240) ~2044 nails: 6 per framing piece + 1 per 8" of plate/rim |
9 boxes | $216 |
| #9 x 2-1/2" exterior deck screws 5 lb (~450) ~60 screws per floor sheet |
1 box | $38 |
| Subfloor adhesive 28 oz | 4 tubes | $32 |
| 8d ring-shank galvanized nails 5 lb (~450), roof sheathing ~60 nails per roof sheet |
2 boxes | $52 |
| 8d hot-dip galvanized siding nails 5 lb (~450) ~70 nails per siding panel, 100 more on each door-side panel |
4 boxes | $108 |
| 6d galvanized casing nails 1 lb (~150) 148 lin ft of trim |
2 boxes | $16 |
| 3" exterior structural screws (50) For splice scabs |
1 box | $16 |
| 10d (3") galvanized common nails 1 lb (~70) ~306 nails: rafter toenails, jack and nailer studs, collar ties |
5 boxes | $35 |
| Hurricane tie, ZMAX/G185 galvanized for treated lumber (Simpson H2.5AZ or equal) One at every rafter-to-plate seat, plus the floor-to-beam corners |
36 each | $49 |
| 10d x 1-1/2" hot-dip galvanized connector nails 1 lb (~100) Use only connector nails in metal connectors |
4 boxes | $44 |
| 8" heavy-duty T-hinge | 6 each | $54 |
| Safety hasp 4-1/2" | 1 each | $9 |
| Door pull handle | 2 each | $16 |
| Barrel bolt 6" Top and bottom of the fixed leaf |
2 each | $14 |
| Shed window for 24" x 36" rough opening Rough opening 24" x 36" on the left wall |
1 each | $123 |
| Exterior acrylic paint 2 coats over ~659 sq ft |
4 gallons | $192 |
| Exterior paintable caulk 10 oz Seal trim edges and panel joints |
10 tubes | $70 |
| Z-flashing 10 ft Over every door/window head and at horizontal siding joints |
4 pieces | $36 |
| House wrap 9 ft x 100 ft Weather barrier behind the siding (LP requires one behind its panel siding) |
1 roll | $140 |
| 4" window flashing tape 75 ft Seals the window flanges to the house wrap |
1 roll | $22 |
| Strap tie 1-1/4" x 24" (Simpson MSTA24 or equal) Two tie the door header to its king studs |
2 each | $10 |
| Optional / recommended | ||
| Landscape fabric 3 ft x 50 ft Under the gravel to stop weeds |
2 rolls | $44 |
Prices are typical US big-box estimates and vary by region and season. Check your local store.
Similar sizes
- 14x16 Gable Shed plans
224 sq ft · from $5,644 - 10x20 Gable Shed plans
200 sq ft · from $5,519 - 12x16 Gable Shed plans
192 sq ft · from $5,201 - 12x20 Gable Shed plans
240 sq ft · from $5,904 - 16x16 Gable Shed plans
256 sq ft · from $6,139 - 12x14 Gable Shed plans
168 sq ft · from $4,861
Questions
How much does it cost to build a 12x18 gable shed?
Between $5,561 (LP SmartSide siding and asphalt shingles) and $6,217 (board and batten siding and a metal roof) in materials at typical US big-box prices, before tax and delivery. Prices vary by region.
How much lumber do I need for a 12x18 gable shed?
About 179 boards (1387 board feet) and 36 sheets of plywood, OSB or siding, depending on the options you choose.
How tall is a 12x18 gable shed?
About 12' 5-15/16" overall, standing on its gravel base, with walls framed from standard precut studs.
Is a 18x12 shed the same as a 12x18?
Same footprint: 216 square feet whether you write it 12x18, 18x12 or 12 x 18. This plan puts the 12-foot wall at the front with the door. If you want the door on the 18-foot wall, set width 18 and depth 12 in the free calculator and the plan is calculated again for that.
Change the size or options in the free calculator.
Full made-to-measure plans
Every size from 4' to 20', gable or lean-to, as many designs as you like: $37 once, not a book of fixed sizes.
$37 one-time, lifetime access
Get my 12x18 plans, $37Cut list · Board-by-board cutting plan · Shopping list · 3D build steps · Printable drawings · 60-day money-back guarantee
Instant online access after checkout. Works in any web browser on your phone, tablet or computer, and every plan prints. Nothing to download or install.