How much does a raised garden bed cost?

A 4x8-foot cedar raised bed (12 inches tall): $100-$200 for materials + $50-$150 for soil = $150-$350 total. Pressure-treated: $50-$100 + soil = $100-$250 total. Pre-made cedar kits: $100-$300 (plus soil). The soil is a significant portion of the cost, especially for tall beds. Buying soil in bulk (by the cubic yard) is much cheaper than bags ($30-$50/cubic yard bulk vs. $4-$7 per bag).

What is the best wood for raised garden beds?

Cedar. Western red cedar heartwood is naturally rot-resistant (10-15+ years without treatment), chemical-free (safe for growing vegetables), and attractive. It is the standard material for raised garden beds. Redwood is equally good but less available and more expensive. Pressure-treated lumber is safe for vegetable gardens (modern treatment does not contain arsenic) and is the most affordable option. Avoid: untreated pine or fir (rots in 2-3 years), railroad ties (creosote is toxic), and pallet wood (may be chemically treated).

How deep should a raised garden bed be?

6 inches: minimum for most herbs and leafy greens. 12 inches: ideal for most vegetables (tomatoes, peppers, beans, squash). 18-24 inches: best for root vegetables (carrots, potatoes, parsnips) and for accessibility (less bending). If the bed sits on native soil: roots can extend below the bed into the ground. If the bed sits on a hard surface (patio, driveway): at least 12 inches deep (18-24 preferred). Deeper beds cost more to fill with soil.

What soil mix should I use for raised beds?

The classic mix: 60% topsoil, 30% compost, 10% perlite or vermiculite. This provides nutrients (compost), structure (topsoil), and drainage (perlite). Do not use pure garden soil or pure compost alone. For a simpler approach: buy a pre-mixed raised bed soil from a landscape supply yard ($30-$50/cubic yard). Amend annually by top-dressing with 1-2 inches of compost each spring. A 4x8x12 inch bed needs about 32 cubic feet (1.2 cubic yards) of soil.

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Raised Garden Bed Building Guide: Materials, Soil & Layout

Lumberama Editorial Team, Garden Construction & Outdoor Living Specialists Jun 11, 2026 13 min read

Why Raised Beds

Raised garden beds are elevated planting areas filled with high-quality soil. Benefits over in-ground gardening: better soil (you control the soil mix — no dealing with poor native soil, clay, or rocks), better drainage (raised beds drain faster, preventing root rot), less bending and kneeling (especially with taller beds, 18-24 inches), fewer weeds (the raised soil is weed-seed-free; add landscape fabric on the bottom to block existing weeds), earlier planting (raised soil warms faster in spring), better pest control (easier to add row covers, netting, and barriers), and a neater, more organized garden appearance.

Materials

Cedar: The best wood for raised beds. Naturally rot-resistant (heartwood lasts 10-15+ years in ground contact without treatment). Beautiful appearance. No chemicals (safe for growing vegetables). $5-$10 per linear foot (for 2x6 or 2x8 boards). Western red cedar is the most rot-resistant. The premium choice.

Pressure-treated lumber: The most affordable wood option. $2-$4 per linear foot. Modern pressure-treated lumber (ACQ or CA-B) is considered safe for vegetable gardens (the old CCA treatment with arsenic was banned in 2003). Lasts 15-20+ years. Downsides: green/brown appearance (less attractive than cedar), and some gardeners prefer to avoid any treated lumber near food crops (line the interior with plastic sheeting if concerned).

Redwood: Similar to cedar — naturally rot-resistant, beautiful, chemical-free. $6-$12 per linear foot. Less available (primarily in the western US). Excellent for raised beds.

Composite lumber: Recycled plastic/wood composite boards. Extremely durable (will not rot). $4-$8 per linear foot. Heavier than wood. Some brands sell raised bed kits. The most maintenance-free option.

Corrugated metal: Galvanized steel panels framed with wood or metal posts. Modern, farmhouse aesthetic. $50-$150 per bed (DIY). Heats up in direct sun (can warm the soil — beneficial in cool climates, potentially harmful in hot climates). Lasts 20+ years.

Concrete blocks: Cinder blocks or landscaping blocks stacked to form the bed walls. $1-$3 per block. Extremely durable. The most affordable option for large beds. No tools needed (stack and fill). Downsides: heavy, industrial appearance (can be painted or stuccoed).

Size

Width: 3-4 feet maximum (you need to reach the center from either side without stepping in the bed). 4 feet is the most common width.

Length: Any length. Common: 4x4, 4x8, and 4x12 feet. Longer beds need internal bracing (the soil pressure pushes the sides outward).

Height: 6 inches (minimum for most vegetables), 12 inches (ideal for most crops), 18-24 inches (easier access, less bending, works for people with mobility issues, and allows root vegetables like carrots and potatoes). Taller beds need more soil (more expensive to fill).

Building a Cedar Raised Bed (4x8x12 inches)

Materials: four 2x12x8 cedar boards (the sides), two 2x12x4 cedar boards (the ends — cut from an 8-footer), four 4x4 cedar posts (12 inches long, for the corners). Cut the boards to length. Screw the side and end boards to the corner posts with 3-inch exterior screws. Level the bed on the ground (remove sod or vegetation first). Optional: line the bottom with cardboard or landscape fabric (blocks weeds). Fill with soil.

Soil

The soil is the most important investment. Use a mix of: 60% topsoil, 30% compost (composted manure, leaf compost, or mushroom compost), and 10% perlite or vermiculite (improves drainage and aeration). Do not use pure garden soil (too dense, poor drainage in a raised bed). A 4x8x12 inch bed needs approximately 32 cubic feet of soil mix (about 1.2 cubic yards). Cost: $50-$150 for bulk soil delivery. Amend with compost annually (top-dress 1-2 inches each spring).