Choosing a Raised Bed Kit

A raised bed is the fastest way to a tidy, productive plot: better drainage, fewer weeds, less bending, and soil you control completely. A kit takes the guesswork out — flat-pack panels that bolt together in an afternoon. Here's how to pick one that lasts, without overspending.

This is part of our starter buying guide — start there if you're kitting out a plot from scratch.

Materials at a glance

There are three sensible choices in the UK. None is "best" for everyone; it's about budget and how long you want it to last.

Timber is the classic. It looks at home in any garden, is warm to the touch and easy to extend. Go for naturally durable wood — cedar or larch — which shrugs off rot for 10–15 years untreated. Cheaper softwood (often pine) is fine but pressure-treated; modern tanalised timber is safe for food crops, but it's the budget end and may need replacing in 5–8 years. Avoid old railway sleepers treated with creosote next to food — the tar can taint soil and crops.

Recycled plastic is the low-maintenance pick. It never rots, never needs oiling, and is often made from milk bottles. It can look a touch utilitarian and the panels flex on long runs, but for a fit-and-forget bed it's hard to beat. Expect 20+ years.

Corrugated metal (galvanised or Corten steel) has become hugely popular and lasts the longest of all. Steel beds are sturdy, modern-looking and quick to assemble. The one catch: metal warms up fast in a heatwave, so beds can dry out quicker — mulch the surface and they're fine. Decent ones are coated to stop rust at the soil line.

Best size and depth

Get the dimensions right and the bed almost looks after itself.

Width: 1.2m, no wider. This is the golden rule. At 1.2m you can reach the middle from either side without ever standing on — and compacting — the soil. Beds you have to climb into defeat the point.

Length: whatever fits, but 2.4m or 3m are common kit sizes. Longer beds need a cross-brace to stop the sides bowing once filled.

Depth — match it to your crops:

• 15–20cm is enough for salad leaves, lettuce, herbs and onions over decent ground.
• 20–30cm suits most vegetables and is the sweet spot for a general bed.
• 30cm+ for root crops like carrots, parsnips and potatoes, which need room to grow down.

If your bed sits on a patio or poor, stony ground, go deeper — the plants only have the bed to work with. Planning more than one bed? Our raised bed planner helps you lay out sizes and spacing before you buy.

Kits vs building your own

A kit wins on speed and finish. Pre-cut panels, corner brackets and clear instructions mean you're done in an hour or two with a screwdriver. Steel and recycled-plastic kits in particular are far easier to buy than to fabricate yourself.

Building your own is cheaper if you're handy and have offcuts going spare — and it lets you fit an awkward corner exactly. But scaffold boards and untreated timber from a yard rot faster than you'd hope, and the savings shrink once you've bought screws, brackets and a weekend.

For most beginners, one good kit beats three DIY beds that need rebuilding in a few years. Buy one, see how you get on, then add more.

Filling it

A bed is only as good as what goes in it. Don't fill it with bagged compost alone — it's expensive and slumps over the season. The reliable mix is roughly half good topsoil and half garden compost or well-rotted manure, topped with a layer of multipurpose to sow into.

To bulk out a deep bed cheaply, part-fill the bottom with cardboard, leaves and rough organic matter (the "hügelkultur" trick), then your soil-and-compost mix on top. Over time it all rots down and feeds the bed. Making your own garden compost keeps topping-up costs near zero, and a yearly mulch of compost — the heart of no-dig growing — keeps the soil in great shape without digging.

Once it's filled and settled, you're ready to sow. Our guide to starting a vegetable garden walks you through what to plant first.

A reliable kit to start with

Once you've decided on material and size, here's a sturdy, beginner-friendly option. As always, the advice above matters more than the specific product — buy on merit.

For everything else a new plot needs — tools, compost, seeds — head back to the starter buying guide.