10×18 Pergola – Free PDF Download

Ovidiu 8 GapDice RANDOM PLAN

This step by step diy project is about 10×18 pergola plans. If you want to build a rectangular pergola, this is a good candidate. This pergola features an elegant timeless design, so you can be sure this project will add value to your property. You can build this pergola in one week.  Remember to read the local codes before starting the project, so you can comply with the regulations. Take a look over the rest of my woodworking plans, if you want to get more building inspiration. Premium Plans for this pergola in the Shop.

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 one weekend



Projects made from these plans




10×18 Pergola Plans – Free PDF Download




  • A – 4 pieces of 6×6 lumber – 8′ long POSTS
  • B – 4 piece of 2×8 lumber – 12′ long BASE BEAMS
  • C – 4 pieces of 2×12 lumber – 20′ long SUPPORT BEAMS
  • D – 14 pieces of 2×6 lumber – 12′ long SHADE ELEMENTS
  • E – 4 pieces of 6×6 lumber – 36″ long, 4 pieces – 52″ long BRACES
  • F – 5 pieces of 1×2 lumber – 20′ long SLATS

 One week



 Build a 10×18 pergola – Video!



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How to build a 10×18 pergola



The first step of the pergola project is to layout the posts. Use batter boards and string to layout the location of the posts. Apply the 3-4-5 rule to every corner and then measure the diagonals to make sure they are perfectly equal. You need to make adjustments until you get the desired result. As you can see in the image, this pergola has a 10×14 base.

Anchoring the posts of the anchor

Anchoring the posts of the anchor

There are a few ways to secure the 6×6 posts into place. You can set the posts in concrete or you can use adjustable anchors and pour footings. Dig the holes 3′ deep (or under the front line) and about 12-13″ in diameter. Compact a layer of gravel to the bottom of the holes and then fit the tube forms. Fit the posts, align them and plumb them with a spirit level. Fill the forms with concrete, while the posts are locked into place with temporarily braces. If you use anchors, you need to align and set them into concrete. Fit the posts after the concrete dries, using lag screw.

Smart tip: Read the local building codes, so you dig the holes at the appropriate depth. For this project, I will assume you will use post anchors, so if you set the posts into concrete, make sure you add 3′ to the posts size.

Installing the posts

Installing the posts

Check if the posts are level and user a circular saw to make corrections. Notice the temporarily braces that hold the posts plumb.

Support beams

Support beams

Continue the diy pergola project by making the base beams. Use 2×8 lumber for these beams.

Rafters - end decorative cuts

Rafters – end decorative cuts

You can add a lot of value to your pergola by making decorative cuts to both ends of the beams. Use a circular saw for the straight cuts and a jigsaw for the curved cuts. Smooth the edges with sandpaper thoroughly.



Fit the beams to the posts and use a spirit level to make sure they are perfectly horizontal. Center the beams to the posts so you get equal overhangs on both sides. Clamp the beams to the posts and drill pilot holes. Insert 9″ carriage bolts to lock everything with attention. Use washers on both beams.

Support beams - 10x18 Pergola

Support beams – 10×18 Pergola

Use 2×12 lumber for the support beams, as well. Make decorative cuts to both ends of the beams, using the pattern shown below.

Decorative ends - Support beams

Decorative ends – Support beams

Make decorative cuts to both ends of the support beams. Use a circular saw for the straight cuts and a jigsaw for the curved cuts. Smooth the edges with sandpaper.

Fitting the support beams - 10x18 Pergola

Fitting the support beams – 10×18 Pergola

Fit the beams to the pergola, perpendicular to the base beams. Center the beams to the top of the posts, leaving equal 12″ overhangs on both sides. Drill pilot holes through the beams and through the posts and insert 9″ carriage bolts. Make sure you plumb the posts again, before attaching the support beams. All corners should also be right angled.

Building the braces

Building the braces

Use 6×6 lumber for the braces. Use a saw to make 45 degree cuts at both ends of the pieces. Use a jigsaw to make the curved cuts that will enhance the look of the backyard pergola. These braces will reinforce the structure of the pergola and make it much more stable to high winds.

Fitting the braces - 10x18 Pergola

Fitting the braces – 10×18 Pergola

Use a spirit level to plumb the posts and then fit the braces into place, as shown in the diagram. Drill pilot holes and insert 5 1/2″ screws to secure the braces into place tightly. Use at least 2 screws for each joint. Make sure there are no gaps between the components, when attaching the braces.

Building the rafters

Building the rafters

Next, use 2×6 lumber for the rafters. As you can see in the plans, you need to make a few slots to the beams so you can lock them to the support beams. Make parallel cuts inside the marked areas and then remove the excess with a chisel.

Rafter end - Decorative cut

Rafter end – Decorative cut

Use a jigsaw to make the curved cuts to both ends of the rafters. Use a circular saw for the straight cuts.



Fit the rafters to the top of the pergola frame. Place the rafters equally spaced, as shown in the diagram. Use rafter ties or just drill pilot holes and insert 5 1/2″ screws to lock the rafters to the supports beams.

Top slats - 10x18 Pergola

Top slats – 10×18 Pergola

Fit the 1×2 slats to the top of the pergola. Place these slats equally spaced for a professional result. Make sure the overhangs are equal. Center the slats to the rafters and then drill pilot holes, before inserting the 1 5/8″ screws. If installed properly, these slats will keep the rafters equally spaced on the long run.

How to build a 10x18 pergola

How to build a 10×18 pergola

Last but not least, you need to take care of the finishing touches. Therefore, fill the holes with wood putty and then smooth the surface with 120-220 grit sandpaper. Apply a few coats of paint or stain over the components, to enhance the look of the patio pergola and to protect the components from decay.

How to build a 10x18 pergola - Free PDF

How to build a 10×18 pergola – Free PDF

This pergola has a stylish design so you shouldn’t be worried that it might not fit the design of your property. In addition, you should adjust the distance between the shade elements to create the amount of shade you desire.



If you want to add charm and unique appeal to your garden, I recommend you to check out these plans. This pergola can be built by any person with basic woodworking skills and it is also very budget friendly. You can make a lot of adjustments to the design so it suits your tastes and needs. Check out the rest of my pergola plans, as I have many designs and sizes you can choose from. In addition, I have over 1500 free woodworking plans on the blog, if you need more building inspiration. See HERE a list with all my free plans.



This woodworking project was about 10×18 pergola 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. Premium Plans for this pergola in the Shop.

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  1. Tauseef at - Reply

    will four post enough to hold everything sturdy for long term? Do you have detail cut out plan.

    • Ovidiu at - Reply

      Don’t recommend 4 posts. Cut plan is available on Premium Plans.

  2. mark at - Reply

    need plans for 10×18 paviliion
    can i buy plans for this or if dont have can i use the pergola plans and just add roof can i buy plans with more details

    • Ovidiu at - Reply

      No plans for that yet. I don’t see how you can use the pergola plans for the pavilion, since they are completely different structures.

  3. mark at - Reply

    do you have premium plans for 10×18 pergola

    • Ovidiu at - Reply

      Not yet.

  4. Paul at - Reply

    I live in the Napa Valley and my location is not subject to high winds. Is it necessary to use the knee bracing? I would like a cleaner look.

    • Ovidiu at - Reply

      They help to strengthen the frame. However, you can skip them if want to and see how it goes.

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