15×15 Gable Pavilion – Free DIY Plans

This step by step diy woodworking project is about a 15×15 outdoor gable pavilion plans. I have designed this square pavilion with a gable roof so you can create some nice shade in your garden. This large pavilion features 4 6×6 posts, so you have large openings on all sides. This gazebo has a 6:12 pitch and it makes for a great sheltered area for a table, a TV or an outdoor couch. You can use metal roofing sheets as well, if you remove the plywood panels and install 1×4 purlins every 16″ on center, starting from the bottom of the roof to the peak.

Make sure you take a look over the local building codes, so you comply with the regulations. Take a look over the rest of our woodworking plans, if you want to get more building inspiration. Premium Plans for this project available Here. Check out the Shop, as well, for full list of Premium Plans.

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.



Projects made from these plans




15×15 Gable Pavilion – Free DIY Plans




[tabs tab1=”Materials” tab2=”Tools” tab3=”Time” tab4=”Related Plans”] [tab id=1]

  • A – 4 pieces of 6×6 lumber – 8′ long POSTS
  • B – 2 pieces of 6×8 lumber – 208″ long TOP PLATES
  • C – 2 pieces of 6×8 lumber – 108″ long CROSSBEAMS
  • D – 10 pieces 6×6 lumber – 36″ long BRACES
  • E – 2 pieces of 6×6 lumber – 38 1/4″ long TOP RIDGE SUPPORTS
  • E – 1 piece of 6×8 lumber – 208″ long TOP RIDGE BEAM

*Shopping List available in the Premium Plans

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 Hammer, Tape measure, Framing square, Level

 Miter saw, Drill machinery, Screwdriver, Sander

 Safety Gloves, Safety Glasses

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 One day

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How to build a 15×15 pavilion



First, layout the posts for the 15×15 pavilion. Use batter boards and string to determine the location of the posts. Apply the 3-4-5 rule to every corner of the pavilion, so you make sure they are right angled. Make sure the diagonals are equal. Determining the location for the pavilion is essential, as you have to comply with the local building codes. Make sure the surface is level and remove the vegetation layer.

Setting the posts in concrete

Setting the posts in concrete

Dig 3 ft holes into the ground, making sure they have about 16″ in diameter. Fit the tubes then the posts into the ground and plumb them with a spirit level. Let the concrete dry out for several days. Read the local codes for more details on how to secure the posts. Fill the holes with concrete and insert the anchors. Align the anchors one to another and let the concrete dry out for a few days. 

Use temporarily braces to lock the posts plumb. Use lag screws to secure the posts to the anchors. Before pouring the concrete you need to make sure the top of the posts are horizontal one to another. Use a laser to mark the level to the top of the posts and use a circular saw, if you need to make cuts.



Use 6×8 lumber for the rails. Mark the cut lines on the beams and then make the cut outs with a circular saw and a chisel. Smooth the surface with sandpaper. Set the circular saw at 3 5/8″ and then make parallel cuts inside the marked areas. Clean the recess with a chisel and sandpaper.



Fit the top rails to the sides of the pavilion. Notice the 14″ overhangs to the front and back of the pavilion. Drill pilot holes through the plates and insert 8″ screws to lock them to the posts. Use 2 screws for each joint. Make sure the corners are square and plumb the posts vertically. Use a spirit level to make sure the beams are horizontal, as well. 



Fit the cross plates to the pavilion. Align the edges flush and drill pilot holes. Insert the 10″ screws to lock the cross plates into place tightly. Use 2 screws for each joint. 



Build the braces for the front and back of the pavilion from 6×6 lumber. Use a miter saw to make 45 degree cuts to both ends of the braces. Fit the braces to the posts, after you plumb them vertically. Drill pilot holes and insert 5 1/2″ screws to secure the braces into place tightly. Use 2 screws for each joint.



Center the 6×6 supports to the top of pavilion. Plumb the supports with a spirit level. Use post to beam connectors to secure the supports to the frame of the pavilion. Insert 2 1/2″ structural screws to lock the supports to the cross-beams. 



Fit the ridge beam to the supports with post to beam connectors. Make sure the corners are square. Notice the 14″ overhangs to the front and back of the pavilion. Use 2 1/2″ structural screws to lock the connectors into place.

Fitting-the-ridge-beam braces

Fitting-the-ridge-beam braces

Use 6×6 lumber for the braces. Make 45 degree cuts at both ends of the braces. Secure the braces into place with 5 1/2″ screws. Drill pilot holes before inserting the screws and use 2 screws for each joint.



Check out PART 2 of the project to learn how to build the gable roof for the large square gazebo.



This is a nice gazebo with 6:12 pitch, that you can build in your backyard and start having a covered relaxation area.



Fill the holes with wood putty and let them dry out for a few hours. Smooth the surface with 100-220 grit sandpaper and remove the residues with a damp cloth.

Top Tip: Apply a few coats of paint or stain to the components, to enhance the look of the project. Premium Plans for this project available Here. Check out the Shop, as well, for full list of Premium Plans.


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This woodworking project was about 15×15 4 post pavilion 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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