10×12 Shed with Flat Roof Plans

This step by step diy project is about diy 10×12 shed with flat roof plans. If you live in an area without snow and with light rain, this garden shed with a flat roof is a good choice if you need extra storage space. Read the local building codes before starting the construction of the shed. 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

10×12 Shed with a Flat Roof Plans

Building a 10×12 flat roof shed

Cut List

• A – 4 pieces of 4×4 lumber – 144″ long SKIDS
• B – 2 pieces of 2×6 lumber – 144″ long, 10 pieces – 117″ long FLOOR
• C – 3 pieces of 3/4″ plywood – 48″x96″ long, 3 pieces – 24″x48″ long FLOORING
• D – 2 pieces of 2×4 lumber – 113″ long, 1 piece – 120″ long, 6 pieces – 91 1/2″ long SIDE WALL
• E – 2 pieces of 2×4 lumber – 113″ long, 1 piece – 120″ long, 6 pieces – 91 1/2″ long, 4 pieces – 7 1/2″ long, 2 pieces – 48″ long, 4 pieces – 25″ long, 4 pieces of 2×6 lumber – 51″ long SIDE WALL WITH WINDOW
• D – 1 piece of 2×4 lumber – 144″ long, 1 piece – 137″ long, 1 piece – 30″ long, 1 piece – 78″ long, 4 pieces – 7 1/2″ long, 2 pieces – 78 1/2″ long, 1o pieces – 91 1/2″ long, 2 pieces of 2×6 lumber – 39″ long FRONT WALL
• D – 2 pieces of 2×4 lumber – 144″ long, 1 piece – 137″ long, 7 pieces – 91 1/2″ long BACK WALL
• E – 10 pieces of T1-11 – 48″x96″ long, 1 piece – 24″x96″ long, 1 piece – 24″x16″ long, 1 piece – 24″x32″ long SIDING

Shopping List

• 2 pieces of 2×6 lumber – 12′
• 13 pieces of 2×6 lumber – 10′
• 4 pieces of 4×4 lumber – 12′
• 4 pieces of 3/4″ plywood – 48″x96″
• 6 pieces of 2×4 lumber – 10′
• 6 pieces of 2×4 lumber – 12′
• 37 pieces of 2×4 lumber – 8′
• 11 pieces of T1-11 – 48″x96″
• 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: 10×12 Shed with Flat Roof Plans
• PART 2: 10×12 Flat Roof Shed Plans
• PART 3: 10×12 Shed with Flat Roof door and Trims Plans
• 10×12 Lean to Shed Plans
• Flat Roof Carport Plans

Building a 10×12 shed frame

Building the frame for the shed floor

The first step of the project is to frame the floor for the 10×12 shed. Cut the floor joists from 2×6 lumber at the right dimensions using a good saw. Smooth the edges with sandpaper and align the components with attention. Make sure the corners are right-angled and drill pilot holes through the rim joists. Insert 3 1/2″ screws to lock everything together tightly.

Floor sheets

Next, attach the 3/4″ tongue and groove plywood sheets to the joists. Align the sheets with attention and insert 1 5/8″ screws to lock them into place tightly. Leave no gaps between the sheets for a neat result.

Building the shed wall frames

Side wall frame

Assemble the side walls from 2x4s. Make sure you cut the studs and the plates at the right dimensions. Drill pilot holes through the plates and insert 2 1/2″ screws into the studs. Place the studs every 24″ on center, making sure the corners are square and the edges flush.

Side wall with window frame

Building the opposite side wall requires more attention, as it has a 48″x48″ opening for a window. As you can see in the plans, you need to use 2×6 lumber for the double headers. Sandwich 1/2″ plywood between the 2×6 headers.

Front wall frame

Continue the project by assembling the font wall for the gable shed. As you can easily notice in the diagram, you need to frame the door opening. You can adjust the size of the door to suit your needs.

Back wall frame

Next, frame the back wall for the 10×12 shed. Assemble the walls on a plane floor, making sure the corners are square and that all joints are rigid.

Assembling the shed frame

After assembling the wall frames you need to install them to the floor of the shed. Align the edges with attention and use a spirit level to plumb them before locking them into place tightly. Use temporarily braces to lock the front and back walls to the floor. Drill pilot holes through the bottom plates and insert 3 1/2″ screws into the floor frame. Fit the side walls to the shed, as shown in the diagram. Insert the screws through the bottom plates into the floor. Lock the adjacent walls together with screws.

Attaching the siding sheets

Side wall panels

Build the exterior walls from 5/8″ T1-11 siding. As you can notice in the diagram, you need to make some cuts to the sheets so you cover the whole surface. Use 8d galvanized nails to secure the sheets to the wall frames. Align everything with attention and insert the nails every 8″ along the studs.

Side wall with window panels

Fit the sheets to the opposite side of the shed. Use a saw to cut out the opening for the window.

Front wall siding panels

Make the cuts to the sheet that goes around the door opening. Align everything so the edges are flush and secure them into place with 8d nails.

Back wall siding panels

Attach the rest of the sheets to the back wall of the shed. Align the edges with attention and secure them to the wall studs with 8d nails or screws. Make sure you leave no gaps between the sheets for a professional result.

Finishing touches

10×12 Shed with a Flat Roof Plans – Front view

This flat roof  shed is super simple to build, so you can really save a lot of money by choosing to assemble it by yourself. However, you need to know the basic carpentry techniques. If you have some experience in the field, you can even adjust the size of the shed to suit your needs.

10×12 Shed with a Flat Roof Plans

Make sure you check out the rest of the project, so you learn how to frame the roof and how to attach the door and the trims to the shed. In addition, I have lots of other shed projects on the site so I recommend you to browse through all alternatives before starting the building project.

10×12 Shed with a Flat Roof – dimensions

Building a 10×12 flat roof shed with a side window will likely cost you between $1,500 and $3,000, depending on the materials and finishes you select. The flat roof design is straightforward, but adding a window and quality materials can bump up the cost a bit. It’s an investment that gives you a sturdy, functional shed with a nice touch of natural light from the window.

10×12 flat roof shed plans

You can expect to spend about 4 to 6 weekends building a 10×12 flat roof shed with a side window. The straightforward design of the flat roof makes the construction process a bit quicker, but adding in the window and getting all the details right will take some extra time. By the end of it, you’ll have a solid, well-lit shed that’s both functional and aesthetically pleasing.

How to build a 10×12 flat roof shed

If you want to download this project as a PDF file, with 1 full cut list and 1 full shopping list, please check out the GET PDF PLANS button bellow.

This woodworking project was about 10×12 flat roof shed 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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