Raised Garden Bed Cost Calculator

Budget your raised bed build before you buy supplies.

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How to Budget a Raised Garden Bed Before You Buy Supplies

Building a raised garden bed is one of the most rewarding weekend projects a homeowner can take on — but costs can spiral fast once you hit the lumber yard. A 4x8 bed in cedar can run anywhere from $80 to $250 before you add a single handful of soil. Knowing your numbers in advance means fewer return trips and no mid-build budget surprises.

What Goes Into the Cost?

A standard raised bed has four main expense categories:

  • Lumber — The biggest line item. Cedar and redwood resist rot naturally but cost more. Untreated pine is cheaper but may only last 3–5 seasons. A typical 4x8x12" bed uses 6–8 boards.
  • Soil and amendments — Fill material is often underestimated. A 4x8x12" bed holds roughly 32 cubic feet of soil. Bulk topsoil runs $0.25–$0.60/cu ft; bagged premium mixes can reach $1.50/cu ft or more.
  • Hardware cloth — A galvanized wire bottom layer keeps gophers and voles out. Figure roughly the footprint of your bed, usually $0.40–$0.80/sq ft.
  • Fasteners and corner brackets — Galvanized screws and metal corner brackets add structural rigidity. Budget $15–$35 depending on bed count and complexity.

Choosing the Right Lumber

The most common options for raised bed lumber are:

  • Cedar (western red) — Naturally rot-resistant, pleasant smell, lasts 10–20 years. Costs roughly $18–$30 per 2x6x8 board depending on your region.
  • Redwood — Similar longevity to cedar, often pricier, more regional availability on the West Coast.
  • Douglas fir (untreated) — Budget-friendly at $8–$14 per board but less rot-resistant. Seal the inside with linseed oil to extend life.
  • Pine (untreated) — Cheapest option, $5–$10 per board. Expect 3–5 seasons before replacement.
  • Composite/recycled plastic lumber — Higher upfront cost but virtually no rot; good for humid climates.

Avoid pressure-treated lumber labeled CCA (older type) — modern ACQ or CA-treated lumber is considered safer, but many gardeners still prefer untreated or naturally rot-resistant wood for food beds.

How Much Soil Do You Actually Need?

Calculate cubic feet by multiplying length x width x height (in feet). A 4x8 bed at 12 inches deep needs 32 cubic feet of soil. At a typical cost of $0.50/cu ft for bulk delivery, that's $16 — but if you buy bagged Mel's Mix or premium raised bed soil at $12 per 1.5 cu ft bag, the same fill runs over $250. Buying in bulk from a local landscape supplier almost always beats bagged product for beds larger than 4x4.

Tips to Save on Your Raised Bed Build

  • Buy lumber in 8-foot lengths — they align perfectly with a standard 4x8 bed with zero waste cuts.
  • Source bulk soil from a local landscape yard rather than big-box bags; you can often save 50–70%.
  • Skip corner brackets and use a simple butt-joint with 3-inch screws — perfectly strong for a single bed.
  • Add a layer of cardboard under your soil to suppress weeds instead of purchasing landscape fabric.
  • Build two beds at once — the per-bed hardware cost drops when you buy screws and brackets in bulk.

Frequently Asked Questions

What is the cheapest wood for a raised garden bed?
Untreated pine is the least expensive option, typically $5–$10 per 2x6x8 board. It will last 3–5 seasons in most climates. If you want longer life without a big upfront cost, Douglas fir treated with raw linseed oil on the interior faces is a solid middle ground. Cedar and redwood cost more but can last 15–20 years, making the long-term cost per season competitive.
How much soil do I need for a 4x8 raised bed?
A 4x8 bed that is 12 inches deep requires 32 cubic feet of soil (4 x 8 x 1 = 32). At 6 inches deep it needs 16 cubic feet. Most bulk landscape suppliers sell by the cubic yard — one cubic yard equals 27 cubic feet, so a 12-inch deep 4x8 bed needs just over one full cubic yard.
Do I need hardware cloth on the bottom of a raised bed?
Hardware cloth is optional but highly recommended if you have gophers, voles, or moles in your area. Use 1/4-inch galvanized hardware cloth stapled or bent up along the inside edges. In areas without burrowing pests, leaving the bottom open allows earthworms to enter and improves drainage naturally.
Is pressure-treated lumber safe for vegetable gardens?
Modern pressure-treated lumber uses copper-based preservatives (ACQ or CA) and is generally considered safe by the EPA for garden use. However, many gardeners prefer to avoid it for food beds as a precaution. Naturally rot-resistant woods like cedar, redwood, or black locust are the most popular food-safe alternatives.
How many boards do I need for a 4x8 raised garden bed?
A standard 4x8 bed at 12 inches tall uses six 2x6x8 boards: two for each long side and one for each short end, with two courses stacked. At 6 inches tall (one course), you need just four boards. Add extra boards if your design uses corner posts or overlapping joints.