Shed plans
12x20 Gable Shed Plans
A 12x20 gable shed gives you 240 square feet of storage. Here's everything it takes to build one, calculated from our plan for this exact size.
$5,510estimated materials
240 sq ftfloor area
176boards to buy
39sheets
12' 5-15/16"overall height
Materials list
| Item | Qty | Est. |
|---|---|---|
| PT 4x6 x 12' Pressure-treated, ground-contact (UC4A) rated. |
3 boards | $94 |
| PT 4x6 x 8' Pressure-treated, ground-contact (UC4A) rated. |
3 boards | $62 |
| PT 2x6 x 14' Pressure-treated, ground-contact (UC4A) rated. |
6 boards | $92 |
| PT 2x6 x 12' Pressure-treated, ground-contact (UC4A) rated. |
12 boards | $158 |
| PT 2x6 x 10' Pressure-treated, ground-contact (UC4A) rated. |
2 boards | $22 |
| 2x8 x 12' | 3 boards | $43 |
| 2x8 x 10' | 3 boards | $36 |
| 2x6 x 14' | 6 boards | $71 |
| 2x6 x 12' | 1 board | $10 |
| 2x6 x 10' | 4 boards | $34 |
| 2x6 x 8' | 25 boards | $170 |
| 2x4 x 14' | 7 boards | $57 |
| 2x4 x 12' | 13 boards | $90 |
| 2x4 x 8' | 2 boards | $9 |
| 2x4 x 92-5/8" precut stud | 69 boards | $275 |
| 1x4 x 12' | 6 boards | $68 |
| 1x4 x 10' | 4 boards | $38 |
| 1x4 x 8' | 7 boards | $53 |
| 23/32" T&G plywood subfloor (Sturd-I-Floor) 4x8 240 sq ft net |
8 sheets | $464 |
| 15/32" CDX plywood roof sheathing 4x8 311.1 sq ft net |
11 sheets | $374 |
| LP SmartSide 38 Series panel 3/8" 4x9 (8" o.c. grooves) 555.7 sq ft net |
18 sheets | $1,116 |
| 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) |
4.5 cu yd | $248 |
| Aluminum drip edge 10 ft Eaves under the underlayment, rakes over it |
8 pieces | $76 |
| Architectural asphalt shingles (3 bundles = 1 square) 311 sq ft of roof + 10% waste |
11 bundles | $462 |
| 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) ~1840 nails: 6 per framing piece + 1 per 8" of plate/rim |
8 boxes | $192 |
| #9 x 2-1/2" exterior deck screws 5 lb (~450) ~60 screws per floor sheet |
2 boxes | $76 |
| 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 |
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 |
| Hurricane tie (Simpson H2.5A or equal) One at every rafter-to-plate seat, plus the floor-to-beam corners |
38 each | $36 |
| 10d x 1-1/2" connector nails 1 lb (~100) Use only connector nails in metal connectors |
4 boxes | $36 |
| 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 ~699 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 |
| Optional / recommended | ||
| Landscape fabric 3 ft x 50 ft Under the gravel to stop weeds |
3 rolls | $66 |
| Auger ground anchor 30" with strap Recommended in windy areas and often required by code/HOA |
4 each | $72 |
| House wrap 9 ft x 100 ft Optional weather barrier behind the siding (recommended by LP for insulated buildings) |
1 roll | $140 |
Prices are typical US big-box estimates and vary by region and season. Check your local store.
Questions
How much does it cost to build a 12x20 gable shed?
About $5,510 in materials at typical US big-box prices, before tax and delivery. Prices vary by region.
How much lumber do I need for a 12x20 gable shed?
About 176 boards (1383 board feet) and 39 sheets of plywood, OSB or siding, depending on the options you choose.
How tall is a 12x20 gable shed?
With standard 8' walls it stands about 12' 5-15/16" tall overall.
Change the size or options in the free calculator.
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