How To Build A Garden Bench

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An AB Courtyard bench is a way to add beautiful accents and seating to any landscape. You can build it on an existing surface like a patio or pavement, as well as on soil. In this example we will create a bench that is 5 blocks high, with a seating height of 18 in. (460 mm).

Step 1: Layout

Determine the location of the 2 posts/pillars and lay the first course of block to establish where to dig the foundation pad using the pattern layout shown below. Make sure the posts/pillars are directly across from each other and are appropriately spaced to accommodate your desired seating material. If building on an existing surface, skip ahead to Step 4.

Step 2: Build the Foundation

Mark the location of the posts/pillars with a shovel, remove the blocks and dig a 24 in. (600 mm) wide, 30 in. (760 mm) long and 4 in. (100 mm) deep hole.

Step 3: Fill Foundation Pad

Using a hand tamper, compact the bottom of the hole, then place 4 in. (100 mm) of crushed rock in the hole and compact again. Check for level.

NOTE: The soil beneath the foundation pad must be a good quality compactable material. If soft soils are encountered, they will need to be removed and replaced with additional crushed rock. A good foundation will ensure a stable bench for years to come.

Step 4: Build the First Post/Pillar

Install the base course of the first post/pillar using 6 Corner Blocks on the crushed rock foundation, or on the existing surface, using the pattern for Course 1 shown below. Square up the blocks, tamp into place and level. If building on an existing surface, shims can be used to help level the blocks.

Step 5: Build the Second Post/Pillar

Install the first Corner Block of the 2nd post/pillar. Use a level and a 2×4 to span across to ensure that the Corner Block of the 2nd post/pillar will be level with the 1st post/pillar. This will ensure the seating area will be level. Make adjustments as needed by adding or removing the crushed rock or installing shims if building on an existing surface. Install remaining blocks to complete the first course, check again for level with the 1st post/pillar.

Step 6: Continue Building

With both posts/pillars level, continue stacking 2 more courses, alternating between the patterns shown to offset the seams from the course below. Do not stack the blocks up using only one pattern (seams should not create a straight line the full height of the post/pillar).

On the 4th course, change the pattern to create the area for the seating material to rest. Only 4 corner blocks will be needed for the next 2 courses and all blocks will be installed with their long sides facing out.

Step 7: Finish the Posts

Finish each post/pillar with two Post Caps. Secure them in place with a bead of masonry adhesive along the outside edge of Corner Blocks. Then set the Post Caps in place. (adhesive optional)

Step 8: Construct the Seat

Measure and install the seating material. Cedar deck boards or a slab of natural stone make good seating materials. See your local supplier for more options

Materials Needed:

  • 52 Corner Blocks
  • 4 Post Caps
  • 2 Tubes of Masonry Adhesive
  • 8 50 lbs bags (23 kg) of crushed rock (if building on soil)
  • 1 Seating material 30 in. wide (760 mm) by the span of the posts/pillars.

Note: For a post/pillar that is 6 blocks tall with a 24 in. (600 mm) seating height, you will need 64 Corner Blocks.

Tools Needed:

  • Square
  • Measuring Tape
  • Shovel
  • Level
  • Work Gloves