12x12 Lean-To Shed Plans
A 12x12 lean-to shed gives you 144 square feet of storage and costs from $4,299 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 12x12 plans
Part of the plan the designer makes for this 12x12 lean-to 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 |
|---|---|---|---|
| 3 | PT 4x6 | PT 4x6 @ 144" | Skid (PT 4x6 on edge, ground-contact rated) |
| 2 | PT 2x6 | PT 2x6 @ 144" | Rim joist |
| 10 | PT 2x6 | PT 2x6 @ 141" | Band joist (front/back), Floor joist @ 16" o.c. |
| 2 | 2x12 | 2x12 @ 65" | Header 2-2x12 (door) |
| 2 | 2x10 | 2x10 @ 153" | Fascia 2x10 |
| 2 | 2x8 | 2x8 @ 162-3/8" (angled) | Barge (fly) rafter 2x8 |
…and 38 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 12x12 lean-to shed as shown, with LP SmartSide siding and asphalt shingles: $4,299. 49 items, 116 boards and 28 sheets.
| Item | Qty | Est. |
|---|---|---|
| PT 4x6 x 12' Pressure-treated, ground-contact (UC4A) rated. |
3 boards | $94 |
| PT 2x6 x 12' Pressure-treated, ground-contact (UC4A) rated. |
12 boards | $158 |
| 2x12 x 12' | 1 board | $25 |
| 2x10 x 14' | 2 boards | $45 |
| 2x8 x 14' | 12 boards | $202 |
| 2x8 x 12' | 1 board | $14 |
| 2x8 x 10' | 1 board | $12 |
| 2x6 x 8' | 1 board | $7 |
| 2x4 x 14' | 7 boards | $57 |
| 2x4 x 12' | 4 boards | $28 |
| 2x4 x 10' | 2 boards | $12 |
| 2x4 x 116-5/8" precut stud | 10 boards | $60 |
| 2x4 x 92-5/8" precut stud | 43 boards | $171 |
| 1x4 x 14' | 2 boards | $27 |
| 1x4 x 12' | 4 boards | $46 |
| 1x4 x 10' | 6 boards | $57 |
| 1x4 x 8' | 5 boards | $38 |
| 23/32" T&G plywood subfloor (Sturd-I-Floor) 4x8 144 sq ft net |
5 sheets | $290 |
| 15/32" CDX plywood roof sheathing 4x8 174.6 sq ft net |
7 sheets | $238 |
| LP SmartSide 38 Series panel 3/8" 4x9 (8" o.c. grooves) 340.2 sq ft net |
10 sheets | $620 |
| LP SmartSide 38 Series panel 3/8" 4x8 (8" o.c. grooves) 125.6 sq ft net |
6 sheets | $312 |
| 3/4" crushed stone, bulk (delivered) 4" compacted pad, 12" past the shed on every side (+15% for compaction) |
3 cu yd | $165 |
| 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 |
6 pieces | $57 |
| Architectural asphalt shingles (3 bundles = 1 square) 175 sq ft of roof + 10% waste |
6 bundles | $252 |
| Shingle starter strip (~100 lin ft) | 1 bundle | $48 |
| #15 felt underlayment roll (~400 sq ft) Two layers (low slope, IRC R905.2.2) |
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) |
1 box | $17 |
| 16d (3-1/2") galvanized framing nails 5 lb (~240) ~1216 nails: 6 per framing piece + 1 per 8" of plate/rim |
6 boxes | $144 |
| #9 x 2-1/2" exterior deck screws 5 lb (~450) ~60 screws per floor sheet |
1 box | $38 |
| Subfloor adhesive 28 oz | 3 tubes | $24 |
| 8d ring-shank galvanized nails 5 lb (~450), roof sheathing ~60 nails per roof sheet |
1 box | $26 |
| 8d hot-dip galvanized siding nails 5 lb (~450) ~70 nails per siding panel, 100 more on each door-side panel |
3 boxes | $81 |
| 6d galvanized casing nails 1 lb (~150) 156 lin ft of trim |
2 boxes | $16 |
| 10d (3") galvanized common nails 1 lb (~70) ~104 nails: rafter toenails, jack and nailer studs, collar ties |
2 boxes | $14 |
| 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 |
26 each | $35 |
| 10d x 1-1/2" hot-dip galvanized connector nails 1 lb (~100) Use only connector nails in metal connectors |
3 boxes | $33 |
| 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 right wall |
1 each | $123 |
| Exterior acrylic paint 2 coats over ~565 sq ft |
4 gallons | $192 |
| Exterior paintable caulk 10 oz Seal trim edges and panel joints |
11 tubes | $77 |
| Z-flashing 10 ft Over every door/window head and at horizontal siding joints |
5 pieces | $45 |
| 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 side walls to the tall front wall at the top plates, two tie the door header to its king studs |
4 each | $20 |
| 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
- 12x12 Gable Shed plans
144 sq ft · from $4,436 - 10x14 Lean-To Shed plans
140 sq ft · from $4,243 - 10x12 Lean-To Shed plans
120 sq ft · from $3,895 - 10x10 Lean-To Shed plans
100 sq ft · from $3,705 - 8x12 Lean-To Shed plans
96 sq ft · from $3,551 - 8x10 Lean-To Shed plans
80 sq ft · from $3,401
Questions
How much does it cost to build a 12x12 lean-to shed?
Between $4,299 (LP SmartSide siding and asphalt shingles) and $4,652 (board and batten siding and asphalt shingles) in materials at typical US big-box prices, before tax and delivery. Prices vary by region.
How much lumber do I need for a 12x12 lean-to shed?
About 116 boards (1003 board feet) and 28 sheets of plywood, OSB or siding, depending on the options you choose.
How tall is a 12x12 lean-to shed?
About 11' 9-5/8" overall, standing on its gravel base, with walls framed from standard precut studs (the front wall is the tall one).
Is a 12x12 shed the same as a 12x12?
Same footprint: 144 square feet whether you write it 12x12, 12x12 or 12 x 12. This plan puts the 12-foot wall at the front with the door. If you want the door on the 12-foot wall, set width 12 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 12x12 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.