16×18 Dormer Shed Plans with Porch And Loft

Build your own Dormer Shed Plans with 4ft Side Porch and Loftt using these professionally drawn DIY shed plans. This design is perfect for backyard storage, garden tools, lawn equipment, workshop use, seasonal items, and extra overhead loft storage.

This updated design includes a 12′ x 18′ enclosed shed area, a 4′ covered porch/overhang along the long side, a double entrance door with transom above, a side man door opening from the porch, three side windows, and a 4′ loft at the end of the shed for additional storage.

These plans are easy to follow for both experienced builders and first-time DIY framers, with clear drawings, step-by-step details, framing information, foundation options, door details, roof framing, dimensions, and a complete materials list.

📦 What’s Included

✅ Detailed floor plan
✅ 4′ side porch / covered overhang layout
✅ 4′ loft layout at the end of the shed
✅ Wall framing plans
✅ Roof framing details
✅ Dormer roof details
✅ Door construction drawings
✅ Complete materials list
✅ Foundation options
✅ Step-by-step construction notes
✅ Rafter dimensions and cut angles
✅ Trim and siding details
✅ Printable PDF format

🏡 Shed Features

📐 Enclosed Shed Size: 12 ft x 18 ft
📐 Overall Width With Porch: 16 ft
🏠 Style: Traditional dormer shed with side porch and loft
🌤 Porch: 4 ft covered porch / overhang along the long side
⬆️ Loft: 4 ft loft at one end for extra overhead storage
📏 Wall Height: 8′-1″ using 92 5/8″ studs
🪵 Floor: 2×6 joists with 3/4″ sheathing
🧱 Walls: 2×4 framing, 16″ O.C., double top plate
🔨 Roof: 2×6 rafters with ridge board
⛰ Main Roof Pitch: 10/12
🏘 Dormer Roof Pitch: 4/12
🪵 Roof Sheathing: 1/2″ OSB
📐 Overhang: 10″ sides and gable ends
💪 Floor Load: 50 PSF
❄️ Roof Snow Load: 40 PSF

🚪 Door & Window Details

🚪 Double Entrance Door: 6′-0″ x 6′-8″ with transom above
🚪 Side Man Door: 2′-6″ x 6′-8″, located on the porch side
🪟 Side Windows: 3 windows, each 2′-0″ x 3′-6″
✅ Includes home-built door construction details

🧱 Foundation Options

✅ Skid foundation
✅ Concrete slab foundation
✅ Treated lumber floor system on gravel bed

🪚 Materials & Construction

Includes a complete materials list broken down by shed section to help estimate costs, request bids, and identify where each part is used.

Designed with T1-11 exterior siding, with other siding options such as vinyl, board-and-batten, or wood siding possible depending on your preference. Trim uses 1×4 and 1×6 wood, Masonite, or cement trim for corners, roof eaves, fascia, porch details, and doors.

The 4′ side porch adds a practical covered entry area while keeping the main 12×18 shed space open and functional. The 4′ loft provides extra overhead storage for seasonal items, bins, tools, and supplies.

⚡️ Instant PDF Download

After purchase, you receive an instant printable PDF download so you can start planning right away.