How to build a raised garden bed

Overview

Raised beds give you better soil, easier weeding, and less back strain. This project uses four 2x6 boards and corner screws — no complex joinery. It takes about 2–4 hours including filling.

Step 1: Choose the location

Most vegetables need at least 6 hours of direct sun. Place the bed on reasonably level ground and keep the width under 4 feet so you can reach the middle from either side. A common size is 4 ft wide by 8 ft long.

Step 2: Cut the boards

Cut 2x6 boards to length for the four walls. For a 4x8 bed you need two 8-ft and two 4-ft lengths per course. Estimate total board feet with the lumber calculator before you buy.

Step 3: Assemble the frame

Screw the boards together at the corners with exterior deck screws. For a taller bed, stack a second course and screw it to the first. Set the frame in place and level it, shimming with soil or scrap where needed.

Step 4: Add a weed barrier (optional)

Lay weed barrier fabric across the bottom and a few inches up the sides to block grass and weeds. This is optional — you can also remove the sod first and skip the fabric.

Step 5: Fill with topsoil

Fill the bed with topsoil. A 4x8 bed filled 12 in deep needs about 4 cubic yards — use the topsoil calculator to get an exact number for your dimensions. Mix in compost for vegetables.

Step 6: Mulch the surface

Spread a 2–3 in layer of mulch over the soil to hold moisture and suppress weeds. The mulch calculator estimates bags or cubic yards for your bed size.

Cost and time

• Materials: $50–$150 per bed, plus soil.
• Time: 2–4 hours.
• Tools: saw, drill, level.

Material and safety notes

• For edible beds, prefer cedar or redwood. If using pressure-treated lumber, line the inside with plastic or fabric so soil doesn't touch it.
• Avoid railroad ties and old treated timbers — they can leach unwanted chemicals into food crops.
• Leave a little headroom at the top of the bed for mulch to sit below the rim.