Raised Garden Bed Corner Project — Project Breakdown

Recreated educational scenario based on common backyard raised bed projects. Not a specific client project.

4×8 ft

Bed Dimensions

10 inches

Wall Height

~$180

DIY Material Cost

~$400

Contractor Estimate

1 Saturday

Time Required

Materials & Cost

Material	Quantity	Cost
Cedar 2"×10"×8' boards	4 boards	$80
Cedar 2"×10"×4' boards (ends)	2 boards (cut from 8' boards)	included above
Metal corner brackets (4")	4 sets	$22
Galvanized screws (2.5")	1 box	$8
Premium soil mix (see recipe below)	12 cu ft (~0.45 cu yd)	$55
Landscape fabric (bottom liner)	1 roll remnant	$10
Total		~$175

Soil Recipe

This is the most important part of a raised bed — the wrong soil mix produces poor yields regardless of what you plant. For a 4×8×10" bed (~27 cubic feet):

50% topsoil — provides structure and microbial life
30% compost — nutrients and drainage improvement
20% perlite or coarse sand — prevents compaction, improves drainage

Do NOT use straight topsoil from a bag — it compacts within one season and plants struggle. The mix above stays loose and productive for years with seasonal compost additions.

Step-by-Step

Build the Frame (1.5 hours)

Cut boards to length: two 8-foot sides, two 4-foot ends (cut from 8-foot boards). Use metal corner brackets for square, strong corners — much cleaner than toe-screwing boards. Stack two 2×10 boards for each side to reach the 20-inch wall height (two courses). Level the frame on the ground before filling.

Prepare the Ground (30 minutes)

Remove grass and loosen the existing soil 6 inches deep inside the bed footprint. This allows roots to grow deeper than the raised bed walls. Lay landscape fabric along the bottom — not to block roots, but to slow grass regrowth from below without stopping drainage.

Fill with Soil Mix (1 hour)

Fill with the soil mix recipe — topsoil first, then compost, then perlite. Mix as you add, not all at once (easier to work in layers). Fill to 1–2 inches below the top edge to leave room for watering without soil washing over the sides.

Plant & Water (30 minutes)

In Virginia, prime planting windows for vegetables: May–June for warm-season crops (tomatoes, peppers, squash) and August–September for cool-season crops (lettuce, kale, spinach). Water immediately after planting and keep consistent moisture while establishing — raised beds dry faster than in-ground beds.

Key Takeaways

Cedar is worth the extra cost over pine — it naturally resists rot without chemical treatment, which matters for food crops.
Corner brackets make assembly faster and result in a more square, professional frame than hand-screwing corners.
The soil recipe matters more than any other factor. Invest in good compost and don't skip the perlite.
Water more frequently than in-ground beds — raised beds drain faster and dry out faster, especially in Virginia summers.

Want More Raised Bed Options?

Read the full raised garden beds guide — covers wood, cinder block, and galvanized metal options with pros and cons of each.

Full Raised Bed Guide →