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How To Make a Sandbox

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To make a sandbox as described here, you need no lumber and no carpentry skills. What starts as a children's play area can be refilled later with topsoil to become a raised garden bed. Instead of wood, which rots and splinters, you'll use pre-fabricated interlocking blocks, the type sold to make low garden walls or retaining walls. You can find these at any garden center in attractive shades of concrete or faux stone.
Difficulty: Average
Time Required: 3-5 hours

Here's How:

  1. Choose a wall block style that complements your garden. To make a sandbox, you'll want blocks with a flat, smooth top, so little knees won't get scraped. Curved blocks allow you to make round or kidney shaped beds; straight blocks make straight lines. Most interlocking blocks for garden walls come in curved and straight versions, so you can mix the two for any shape. Two courses (layers) will make a sandbox 8-10 inches high. Note: the bigger and taller your walls, the more play sand you'll need to fill the sandbox (See #7 below).
  2. Dig out the space. If your aim is to make a sandbox that is nice and deep for kids to play in (with well-loosened soil for that future raised garden bed, too), dig down 4-6 inches.
  3. Place landscape fabric at the bottom. Also called "weed barrier," landscape fabric lets water through, but prevents insects, weeds and small animals from coming up into the bed. You can find landscape fabric at any good home and garden supply shop. Leave slack on each side, so that you'll be able to tuck this extra material between the bottom and the next course, to secure it. Or, use earth staples (hairpin-like curved metal pins) to secure the fabric directly into the ground.
  4. Spread a layer of sand around the edges of the bed. This will help you level the low wall you will be building for your sandbox.
  5. Lay interlocking blocks on the outside edge. Settle the first course into the sand, using a tamper and a level to make sure it is straight and neat-looking. Apply a layer of masonry glue and then put on the next course. Add more courses later if you wish to make a sandbox with a higher wall.
  6. Fill the contained area with sand. To make a sandbox, what you'll want for sand will be labeled as "Play Sand" or "Sandbox Sand." Sterilized and sifted, it contains no large particles that children might swallow or choke on, and it will not stick to your child's skin as landscape sand or masonry sand will do.
  7. How much play sand do you need? If the size of your sandbox is 4 feet x 4 feet, to fill a 10-inch high surround adequately you'll need one half of a cubic yard of play sand, or a little over half a ton. To determine how much play sand to get, measure your contained area (depth x width x length in feet). Divide this number by 27 and you'll know how many cubic yards are required. Confirm it's correct with your sand supplier.
  8. When not in use, cover the sandbox. If you don't, wandering cats will use it for a litter box. Cut a plastic tarp to the size of the bed, or use an old bedspread -- it is easy to remove for play and a dark color such as brown will blend in.

Tips:

  1. Variation #1: Build a sandbox with plastic blocks. Mail order sources also sell blocks made of heavy plastic to look like paving stones. These interlock with metal rods and are sturdy enough for a children's play area, yet are lighter than masonry blocks. No need to dig down into the ground: just assemble the blocks upon the ground or the grass, then add play sand.
  2. Variation #2: Build a "sandbox" of dirt. Children too old for a sandbox (5-8 years) will thoroughly enjoy a "dirt box." Simply fill the bed area with good topsoil, and let the kids play in it for a season or two. Trust me, this will be a magnet for small boys particularly, providing endless hours of playtime involving toy metal trucks and plastic army men. Warning: kids will get very, very dirty in a dirt box! But that's the fun of it.
  3. Variation #3: Build a beach for adults. An original idea from Dick Cavanaugh in Marin County, California and a nice addition to waterfront gardens or a backyard's built-in pool. Dig down about 12 inches, in a large area 7’ x 9’ adjoining the pool patio. Fill with clean landscape or builders' sand (you will need 2 1/2 cubic yards.) Instant beach! Replenish the sand each spring, or as needed.
  4. Reader, Eric emailed us after the publication of this article with "one important change" he would propose in building a sandbox. Says Eric: "If you position the sandbox so that it will get a few hours of sun per day and cover the sandbox with a fine screen rather than plastic, the sun will act as a sanitizer."

What You Need

  • Prefabricated interlocking wall blocks
  • Masonry glue (sold with blocks)
  • Landscape fabric (non-woven porous type)
  • Earth staples (sold with landscape fabric) [optional]
  • Shovel for digging
  • Soil tamper tool
  • Carpenter's level
  • Sand
  • Tarp or old bedspread
Related Video
Build a Stone Patio
Build a Decorative Shelf
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