12×16 Shed Dormer Plans

This step by step diy project is about 12×16 shed dormer plans. This is PART 2 of the 12×16 shed, where I show you how to build the gable roof and how to frame the dormer. Building a dormer will add extra light inside the shed, as well as space. This shed also features a loft, so you almost double the storage space. Take a look over the rest of my woodworking plans, if you want to get more building inspiration.

When buying the lumber, you should select the planks with great care, making sure they are straight and without any visible flaws (cracks, knots, twists, decay). Investing in cedar or other weather resistant lumber is a good idea, as it will pay off on the long run. Use a spirit level to plumb and align the components, before inserting the galvanized screws, otherwise the project won’t have a symmetrical look. If you have all the materials and tools required for the project, you could get the job done in about a day. See all my Premium Plans HERE.

Projects made from these plans

 

12×16 Shed Dormer Plans

Building-a-shed-with-dormer

Cut and Shopping Lists

• H – 4 pieces of T1-11 siding – 48″x41 3/4 long, 2 pieces – 48″x59 1/2″ long, 2 pieces – 30 1/2″x48″ long, 2 pieces – 28 1/2″x37 1/4″ long, 2 pieces – 32 3/4″x43 3/4″ long 2xGABLE END
• I – 2 pieces – 29 3/4″ long, 1 piece – 97 1/2″ long, 5 pieces – 34 1/2″ long, 4 pieces – 22″ long, 6 pieces – 5 1/2″ long, 8 pieces – 35″ long, 2 pieces – 27 1/2″ long, 2 pieces – 19 1/2″ long, 2 pieces – 11 1/2″ long DORMER FRAME
• J – 27 pieces of 2×6 lumber – 104 1/2″ long, 7 pieces – 80 3/4″ long, 5 pieces – 18″ long RAFTERS
• J – 2 pieces of 2×4 lumber – 54″ long, 1 piece of 2×6 lumber – 212″ long RIDGE BOARD
• J – 4 pieces of 2×6 lumber – 104 1/2″long, 4 pieces – 6 1/4″ long OVERHANG
• K – 4 pieces of 1/2″ plywood – 48″x58″ long, 2 pieces – 4 1/4″x58″ long, 1 piece – 10 1/2″x96″ long, 3 pieces – 48″x96″ long, 2 pieces – 48″x48″ long, 2 pieces – 10″x96″ long, 2 pieces – 4 1/4″x96″ long, 2 pieces – 4 1/4″x10″ long, 1 piece of 3/4″ plywood – 31 1/2″x96″ long, 1 piece – 48″x96″ long, 2 pieces of 1×6 lumber – 78″ long ROOF SHEETS
• L – 4 pieces of 1×8 lumber – 107 3/4″ long, 4 pieces – 106″ long, 2 pieces – 78″ long, 1 piece – 107″ long TRIMS
• M – 320 sq ft of tar paper, 320 sq ft of asphalt shingles ROOFING
• N – 8 pieces of 2×6 lumber – 12′ long, 5 pieces – 92 1/2″ long, 1 piece – 97 1/2″ long LOFT JOISTS
• O – 2 pieces of 3/4″ plywood – 48″x96″ long, 4 pieces – 36 1/2″x48″ long LOFT

• 13 pieces of 2×4 lumber – 8′
• 1 piece of 2×4 lumber – 10′
• 1 piece of 2×6 lumber – 18′
• 35 pieces of 2×6 lumber – 10′
• 9 pieces of 2×6 lumber – 12′
• 12 pieces of 2×6 lumber – 8′
• 5 pieces of 5/8″T1-11 siding – 4’x8′
• 7 pieces of 3/4″ plywood -4’x8′
• 11 pieces of 1/2″ plywood – 4’x8′
• 10 pieces of 1×8 lumber – 10′
• 2 pieces of 1×8 lumber – 8′
• 320 sq ft of tar paper, 320 sq ft of asphalt shingles
• rafter ties
• 1 5/8″ screws
• 8d nails, 2 1/2″ screws, 3 1/2″ screws
• wood filler , wood glue, stain/paint

Tools

 Hammer, Tape measure, Framing square, Level

 Miter saw, Drill machinery, Screwdriver, Sander

 Safety Gloves, Safety Glasses

Time

 One week

Related:

• PART 1: 12×16 Gable Shed with Dormer Plans
• PART 2: 12×16 Shed Dormer Plans
• PART 3: Doors and Trims for 12×16 Shed

It’s that easy to build a shed with dormer!

Building a 12×16 gable shed roof plans

Fitting the ridge beam

Use 2×4 lumber for the top ridge supports. Drill pocket at both ends of the supports. Center the supports to the top plates and insert 2 1/2″ screws to lock it into place tightly. Make sure the corners are square and plumb the supports with a spirit level. Fit the ridge beam to the supports, leaving 10″ overhangs to the front and back.

Building-the-rafters-for-gable-12×16-shed

Use 2×6 lumber for the rafters. Use a miter saw to make 37.5 degree cuts at both ends of the rafters. In addition, mark the cut lines for the birdsmouth cuts to one end of the rafters. Use a circular saw to make the cuts.

Fitting the rafters – 12×16 shed

Fit the rafters to the top of the shed. Place the rafters, every 16″ on center. Use rafter ties to lock the rafters to the wall plates. Drill pilot holes through the top of the rafters and insert 3 1/2″ screws to secure them to the ridge beam.

Gable end supports

Fit the supports to the gable ends. Make the angle cut to the top of the supports. These supports are needed so you can attach the T1-11 siding sheets to the gable ends.

Gable end panels

Attach the T1-11 siding panels to the gable ends. Align the edges with attention and secure them into place with 6d nails. Leave no gaps between the panels for a professional result.

Building the overhangs – 12×16 shed

In order to create nice overhangs for the front and back faces of the storage shed, I recommend you to follow this diagram. Mark the cut lines on the 2×6 beams and get the job done with a circular saw. Fit the blockings with 3 1/2″ screws. You can adjust the size of the overhangs to suit your needs.

Fitting the overhangs

Fit the overhangs to the front and back of the shed, as shown in the diagram. Align the edges with attention, drill pilot holes and insert 3 1/2″ screws to lock them into place tightly.

Fitting the loft joists – 12×16 shed with dormer

Fit the 2×6 joists to the loft of the shed. Make sure you secure the beams to the bottom of the rafters. Leave a opening for the ladder, so you can access the loft and store large items.

Loft-sheets

Use 3/4″ plywood for the floor of the loft. Cut all the sheets at the dimensions shown in the free plans and set them to the joists. Leave no gaps between the boards, drill pilot holes and insert 1 5/8″ screws, every 8″ along.

Dormer-frame-frame

Next, you need build the wall frame for the dormer. Cut the components as shown in the diagram. Drill pilot holes and insert 2 1/2″ screws into the studs. Use 2×4 lumber for the double headers (fit 1/2″ plywood). You can adjust the size of the window openings to suit your needs.

Fitting front wall for the dormer

Fit the wall frame to the top of the shed, between the rafters, as shown in the diagram. Drill pilot holes and insert 3 1/2″ screws to lock the wall frame into place.

Dormer rafter

Use 2×6 lumber for the end dormer rafters. Mark the cut lines on the beams and get the job done with a circular saw.

Rafters for the dormer

Build the rest of the rafters for the dormer.

Fitting the rafters to the dormer

Fit the rafters to the dormer every 16″ on center and lock them into place with rafter ties and screws.

Dormer front rafters

Use 2×6 lumber for the short rafters that go to the front of the dormer. Make the cuts, as shown in the diagram.

Fitting the front rafters to the dormer

Fit the rafters to the frame of the dormer. Drill pilot holes and insert screws to secure the rafters into place.

Side supports for the dormer

Use 2×4 lumber for the side supports of the dormer. Make the cuts to the supports with a circular saw. Make a 37.5 degree cut to the bottom of the supports.

Fitting the side supports for the dormer

Fit the supports to the sides if the dormer, as shown in the diagram. Drill pilot holes and insert 3 1/2″ screws to lock them into place tightly.

Fitting the roof sheets around the dormer

Next, fit the 1/2″ plywood to the top of the roof. Cut the sheets as shown in the diagram and attach them to the top of the shed. Align the edges, drill pilot holes and insert 1 5/8″ screws to lock them into place tightly.

Siding sheets for the dormer

Use T1-11 siding sheets for the side walls of the dormer. Mark the cut lines on the sheets and then get the job done with a circular saw.

Fitting the siding sheets to the dormer

Fit the panels to the exterior of the dormer, as shown in the diagram. Insert the 6d nails, every 8″ to lock them into place.

Fitting the sheets to the other side of the shed roof

Fit the 1/2″ plywood sheets to the other side of the roof, as shown in the diagram. Drill pilot holes and insert 1 5/8″ screws, every 8″ along the framing.

Fitting-the-roof-sheets-for-dormer

Fit the 3/4″ plywood sheets to the top of the dormer. Notice the 1×6 boards that are placed on both sides, as overhangs.

Roof trims

Use 1×8 lumber for the front and back roof trims. Use a miter saw to make 37.5 degree cuts to both ends of the trims.

Fitting the trims to the shed roof

Fit the trims to the front and sides of the 12×16 storage shed. Align the edges, drill pilot holes and insert 8d nails to lock them into place tightly.

Side dormer trims

Use 1×8 lumber for the side dormer trims. Make the cuts as shown in the plans.

Fitting the trims to the dormer roof

Align the edges with attention and lock them into place with 2 1/2″ screws.

Fitting the roofing – 12×16 shed with dormer

Cover the roof of the shed with roofing felt, making sure the strips overlap at least 2″. Secure the tar paper to the plywood sheets with roofing staples. In addition, cut a 12″ piece for the top ridge. Fit the side drip edges over the roofing felt, while the bottom drip edges should be fit under.

12×16 Storage Shed with Dormer Plans – Side view

Make sure you check out the rest of my shed plans HERE (I have tons of free designs in sizes).

How to build a shed with dormer

12×16-storage-shed-with-dorner-plans

This storage shed has a large surface for keeping all your tools organized. The double front doors and the single side door help you have an easy access to the inside of the shed. The loft almost doubles the storage area. Make sure you take a look over PART 1 of the plans to learn how to build the frame for the shed. In PART 3 of the shed I will show you how to build the door and how to fit the decorative trims for the shed.

This woodworking project was about 12×16 shed with roof dormer plans free. If you want to see more outdoor plans, check out the rest of our step by step projects and follow the instructions to obtain a professional result.

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