What lumber should I use?

Cedar: best balance of cost, longevity, and aesthetics for most home gardens. 10-15 years life, naturally rot-resistant, attractive aging. Redwood: longest-lasting wood (15-25 years), most expensive (often 30-50% over cedar), regional availability. Pine untreated: cheapest, shortest life (3-5 years), best for “temporary” or starter beds. Pine pressure-treated: 7-10 year life, modern treatments (post-2003) are safe for vegetables; older CCA-treated lumber is NOT safe and should be avoided.

Is pressure-treated wood safe for vegetable beds?

Modern pressure-treated wood (post-2003 in US) uses ACQ, CA, or copper azole — generally considered safe for vegetable contact. The older CCA (chromated copper arsenate, banned in 2003 for residential use) leached arsenic and is NOT safe. Look for “ACQ,” “CA,” or “copper azole” labeling. For maximum safety on edible crops, line the inside of the bed with thick (6+ mil) plastic sheeting.

How much soil do I need?

Volume = length × width × depth, in cubic feet, divided by 27 = cubic yards. A 4×8×12' bed needs 32 cubic feet (1.2 cubic yards). A 4×4×12' bed needs 16 cubic feet (0.6 cubic yards). Add 10-15% buffer for settling. Calculator handles this automatically. Soil cost: bulk $30-50/yard plus delivery ($40-100), or bagged at $5-7 per 2 cu ft bag.

What about metal kits?

Galvanized steel raised bed kits (Vego Garden, Birdies, Olle) cost $150-450 depending on size, and last 25-30 years. Pros: faster install (no cutting), longer life than wood, doesn't rot, often modular. Cons: visible aesthetic (some prefer wood), heat absorption (can warm soil more in summer), assembly required (typically 30-60 minutes). For small to medium beds, kit pricing is competitive with high-end cedar; for large beds, wood usually wins on cost.

Should I use weed barrier fabric?

Optional but recommended for new bed installations on grass / weedy ground. Cardboard works as well as commercial fabric and costs nothing — flatten boxes, lay across the bed footprint, soak with water, then build the bed on top. Cardboard breaks down to compost over a season, smothering weeds underneath while letting earthworms migrate up. Commercial landscape fabric lasts longer but doesn't break down, can become a maintenance issue at end of life.

How tall should I build it?

Depends on what you're growing. 6-8 inches: shallow-rooted greens (lettuce, spinach, herbs). 12 inches: most vegetables (tomatoes, peppers, beans, squash). 18-24 inches: deep-rooted (carrots, parsnips, full potato hilling). 24-32 inches: ergonomic / accessibility (less bending). The deeper you build, the more soil and lumber needed — but also the better drainage, root depth, and gardening comfort. For mixed-vegetable use, 12 inches is the most common compromise.

Home & Life · Free tool

Raised Bed Cost Calculator

Calculate the lumber, soil, and hardware cost for a raised bed. Compare cedar, pine, and metal materials instantly online with no signup needed.

Updated June 2026

Length (ft)Width (ft)Height (inches)

Frame materialSoil mix

Lumber / frame

$120

24 lin ft

Soil

$36

1.19 cu yd

Hardware

$15

Screws, brackets

Total cost

$171

$5.33/sqft

Frame lifespan: 10-15 years. Cedar is the sweet spot for durability vs cost. Avoid pressure-treated wood for edible gardens.

Soil note: Budget option — works for most crops. Buy bulk for anything over 1 cu yd; bagged soil is ~2x the price.

Bed size: 32 sqft, 1.19 cu yd of soil. Most gardeners find 4ft width ideal — you can reach the center from either side without stepping on the soil.

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What it does

Building a raised garden bed has three cost components most beginners underestimate: lumber (the bed frame itself, dominated by material choice — cedar is 3-5× the price of pine but lasts 2-3× as long), soil (the big surprise — a 4×8×12' bed needs about 32 cubic feet / 1.2 cubic yards of soil, costing $80-180 depending on bulk vs bagged), and hardware (corner brackets, screws, weed-barrier fabric, optional irrigation — adds $20-100 typically). Total realistic cost for a basic 4×8' cedar bed at 12' depth: $250-450 all in. Pine equivalent: $150-280. Pre-built metal kit (galvanized steel, 25-year life): $200-450 for similar size with no assembly tools needed.

The calculator takes bed dimensions (length, width, depth), wall material (cedar / redwood / pine / Douglas fir / composite / galvanized metal), and construction style (single-layer / double- stacked / hügelkultur with cheap fill at bottom), then totals: lumber feet and cost, soil cubic feet and cost, hardware (corner brackets, screws, optional landscape fabric), and grand total. Material life expectancy: Cedar 10-15 years (best longevity-to-cost ratio for most climates), Redwood 15-25 years (longest-lasting wood, expensive), Pine untreated 3-5 years (shortest, cheapest), Pine pressure-treated 7-10 years (caveat: modern pressure treatment is generally safe for vegetables since 2003 EPA changes — older CCA-treated wood is NOT safe), Cedar treated with linseed oil 15-20 years, Galvanized metal 25-30 years, Composite (Trex-style) 30+ years but 4-5× the cost.

Strategic considerations the calculator surfaces: (1) Soil dominates cost for smaller beds; lumber dominates for larger. A 4×4×12' bed: lumber ~$80, soil ~$40. A 4×16×12' bed: lumber ~$200, soil ~$120. (2) Bulk soil delivery makes dramatic difference — bulk runs $30-50/ cubic yard plus delivery; bagged equivalent $90-145/cubic yard. Crossover at ~1 cubic yard. (3) Hügelkultur (filling bottom 6-12 inches with logs, branches, leaves) cuts soil cost 30-50% on deep beds and provides slow-release nutrients for 5-10 years. (4) Pre-built metal kits are comparable to wood kit pricing for small beds and dramatically faster to install (no cutting, no assembly tools beyond a screwdriver). (5) Multi-bed builds — order all lumber and soil at once for delivery-fee savings.

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How to use it

Enter bed dimensions: length, width, depth (feet/inches or meters/cm).
Pick wall material: cedar / redwood / pine / pressure-treated / metal kit / composite.
Pick construction style: standard / hügelkultur (cheap fill bottom) / multi-tier.
Add hardware (corner brackets, weed barrier, optional drip irrigation).
Read line-by-line cost: lumber, soil, hardware, total.
Compare to pre-built kit alternatives ($200-450 for similar capacity).

When to use this tool

Planning a new raised bed garden — budget before buying materials.
Comparing wood vs metal kit options for cost and longevity.
Multi-bed garden plans — bulk order math for soil and lumber delivery.
Hügelkultur planning — calculating top quality-soil layer separately from cheap fill.
Replacement / refresh — when a 5-year-old pine bed is rotting and you're deciding whether to rebuild or upgrade.

When not to use it

Container gardening / grow bags — different scale and material assumptions.
Permanent in-ground garden plots (not raised) — no bed-frame cost; just soil amendments.
Commercial / market-garden scale (10+ beds) — bulk material pricing differs significantly; consult landscape supplier directly.
When local building codes regulate raised bed height or materials (rare but exists in some HOAs and historic districts).

Common use cases

Pre-decision sanity-check on inputs and outputs
Educational use — demonstrating the underlying concept
Onboarding a colleague who needs the same calculation/conversion
Verifying a number or output before passing it on

Frequently asked questions

What lumber should I use?: Cedar: best balance of cost, longevity, and aesthetics for most home gardens. 10-15 years life, naturally rot-resistant, attractive aging. Redwood: longest-lasting wood (15-25 years), most expensive (often 30-50% over cedar), regional availability. Pine untreated: cheapest, shortest life (3-5 years), best for “temporary” or starter beds. Pine pressure-treated: 7-10 year life, modern treatments (post-2003) are safe for vegetables; older CCA-treated lumber is NOT safe and should be avoided.
Is pressure-treated wood safe for vegetable beds?: Modern pressure-treated wood (post-2003 in US) uses ACQ, CA, or copper azole — generally considered safe for vegetable contact. The older CCA (chromated copper arsenate, banned in 2003 for residential use) leached arsenic and is NOT safe. Look for “ACQ,” “CA,” or “copper azole” labeling. For maximum safety on edible crops, line the inside of the bed with thick (6+ mil) plastic sheeting.
How much soil do I need?: Volume = length × width × depth, in cubic feet, divided by 27 = cubic yards. A 4×8×12' bed needs 32 cubic feet (1.2 cubic yards). A 4×4×12' bed needs 16 cubic feet (0.6 cubic yards). Add 10-15% buffer for settling. Calculator handles this automatically. Soil cost: bulk $30-50/yard plus delivery ($40-100), or bagged at $5-7 per 2 cu ft bag.
What about metal kits?: Galvanized steel raised bed kits (Vego Garden, Birdies, Olle) cost $150-450 depending on size, and last 25-30 years. Pros: faster install (no cutting), longer life than wood, doesn't rot, often modular. Cons: visible aesthetic (some prefer wood), heat absorption (can warm soil more in summer), assembly required (typically 30-60 minutes). For small to medium beds, kit pricing is competitive with high-end cedar; for large beds, wood usually wins on cost.
Should I use weed barrier fabric?: Optional but recommended for new bed installations on grass / weedy ground. Cardboard works as well as commercial fabric and costs nothing — flatten boxes, lay across the bed footprint, soak with water, then build the bed on top. Cardboard breaks down to compost over a season, smothering weeds underneath while letting earthworms migrate up. Commercial landscape fabric lasts longer but doesn't break down, can become a maintenance issue at end of life.
How tall should I build it?: Depends on what you're growing. 6-8 inches: shallow-rooted greens (lettuce, spinach, herbs). 12 inches: most vegetables (tomatoes, peppers, beans, squash). 18-24 inches: deep-rooted (carrots, parsnips, full potato hilling). 24-32 inches: ergonomic / accessibility (less bending). The deeper you build, the more soil and lumber needed — but also the better drainage, root depth, and gardening comfort. For mixed-vegetable use, 12 inches is the most common compromise.

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