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Metal vs wooden raised beds

Updated: October 2026

You are choosing a frame that has to sit through a wet UK winter before it earns a tomato. Metal vs wooden raised beds is that fork: a galvanised sheet kit from amazon.co.uk, or timber you can repair a board at a time. Plastic and corten are a different decision, and they stay off this page. The metal kits, with prices and review counts, are on the [metal raised bed comparison](/hub/raised-beds-greenhouses-and-compost/raised-bed-metal). Peter F. compared those listings with public UK notes on depth and coatings. This is not a rot or rust trial. A qualifying purchase can earn a commission at no extra cost to you.

You are choosing a frame that has to sit through a wet UK winter before it earns a tomato. Metal vs wooden raised beds is that fork: a galvanised sheet kit from amazon.co.uk, or timber you can repair a board at a time.

Our top picks

Harbour Housewares Harbour Housewares 180 cm

Best overall

Harbour Housewares Harbour Housewares 180 cm
8.4/10about £30.99
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VIREO GARDEN VIREO GARDEN round pair

Best value

VIREO GARDEN VIREO GARDEN round pair
6.8/10about £30.63
View offer
ZORMY ZORMY long pair

Alternative

ZORMY ZORMY long pair
6.2/10about £41.99
View offer
On this page
  1. 1.Why you might choose metal
  2. 2.Why you might choose timber
  3. 3.Heat, rust, and coastal air
  4. 4.Price and the afternoon you spend
  5. 5.A quick way to choose

Why you might choose metal

Empty weights run from about 6.6 kg for a single Harbour 180 × 90 cm frame to the mid-teens for a two-pack. Rot in a plank is what you leave behind if you are switching from untreated softwood. Only ZORMY prints a gauge, 0.4 mm, on 14 reviews. BS EN ISO 1461 does not certify these pressed kits. The Galvanizers Association treats continuously galvanised sheet as outside that batch hot-dip scope. Harrod Horticultural’s own beds, for context, start nearer £88 at about 1 mm. That named gauge is not this amazon.co.uk set.

Why you might choose timber

Timber wins when you want the look of timber and when you can replace one rotten board. The RHS builds raised beds in timber and spends its guidance on depth, width, and the soil mix. It does not hand you a lifespan in years. Treated timber raises a separate question about the preservative and about growing food against it. We do not claim either material is certified food-safe. You choose the compost. The frame holds it.
Harbour Housewares Harbour Housewares 180 cm

Testsieger

Harbour Housewares Harbour Housewares 180 cm
8.4/10about £30.99
View offer

Heat, rust, and coastal air

The Raised Bed Company notes faster drying along a metal wall in a hot spell. Grow Scotland also flags heat at the edge and salt on a scratched coating. Those are warnings, not a temperature log for the beds in our table. Water the outer row sooner in a hot June. Rust starts at a cut edge, a lost rubber lip, or a screw that bares steel. One Harbour shopper reported no rust after a winter on beds in the same range. That is one household, not a trial of 0.4 mm sheet.

Price and the afternoon you spend

Most kits in this set were about £26 to £42 on 20 October 2026, and about £52 to £60 for the taller pair or the trellis kit. A 486 litre fill can cost more than the ring. Metal arrives as a bolt puzzle. One Harbour twin-pack reviewer counted 80 wing nuts. You can move the panels only after you dig the soil out. A full 180 × 90 cm frame is not a piece of furniture.

A quick way to choose

Choose metal if you want an open-bottom kit this season and you accept an unstated thickness on all but one listing. The top pick inside that choice is on the best galvanised raised bed page. Choose timber if you want to repair one side. Buying checks are on the galvanised raised bed buying guide. Leave the 30 cm metal table if the bed must stand on tarmac at the RHS schools depth of at least 50 cm. Height bands are on raised bed height for vegetables. Rustington’s tenancy asks before raised beds go in.

Common questions

Do metal beds rust faster than wood rots?
They fail in different places. Untreated softwood in damp compost rots at the soil line. Galvanised sheet rusts where the coating is cut or scratched, especially in salt air. Only ZORMY states a thickness, 0.4 mm, so a long life is not something we will promise. One winter without rust on a Harbour bed in the same range is a single review. Check the edge and the screws each spring.
Is metal too hot for the roots?
Seller guidance we used says the soil at a metal edge can dry faster in a hot spell. The centre of a bed on open ground is still ordinary soil a little way down. Water the outer plants first, and mulch if the rim is baking. On tarmac, heat and shallow depth arrive together, which is a reason to avoid a 30 cm metal kit as your only patio bed.
Are metal kits lighter to put up?
The panels are light and the bolt count is not. A 6–8 kg kit is an easy carry, and assembly can still take an hour, or much longer when holes do not line up. People with sore hands have finished a Harbour bed, and other people have called a twin pack a long job. Budget a morning, a driver, and gloves. Read tool-free as wing nuts, which still take time.
Which lasts longer on an allotment?
Whichever the site allows, at a gauge or a timber spec you can name. Consent comes first. Rustington asks for written permission for raised beds, and some sites restrict metal that is not for cropping. After that, a named 1 mm steel bed or a durable timber kit is a clearer buy than 0.4 mm sheet or untreated softwood. Seller year-counts are their ranges. The tenancy and the thickness are the facts you can check.
Is galvanised steel safer than treated timber for vegetables?
Neither material here arrives with a food-safe certificate we can cite, so we will not call one safe and the other unsafe. Galvanised sheet is a common vegetable-bed frame, and treated timber depends on the treatment. Ask the timber seller what the preservative is. A marketplace bullet is not a certificate. The compost you add is the growing medium either way.
Can you move a metal kit when you move house?
You can, after you dig the soil out. The panels unbolt and pack flat, which is the advantage over a nailed timber box. A full bed is not portable. Plan the empty lift. If you change plots often, a 120 × 60 cm bed is a kinder unit than a 180 × 90 cm oval you have to empty first.

Related pages

Wood raised bed comparison

Metal raised bed

Best galvanised raised bed for a UK vegetable plot

Galvanised raised bed buying guide for size and steel

Raised bed height for vegetables on lawn or tarmac

How to fill a metal raised bed with the right litres

Sources

Public UK sources from the research digest, last checked on 20 October 2026.

  1. RHS — How to make a raised bed (retrieved 20.10.2026)
  2. RHS — No-dig gardening (retrieved 20.10.2026)
  3. RHS — Creating raised beds (schools) (retrieved 20.10.2026)
  4. Which? — How to build raised garden beds (retrieved 20.10.2026)
  5. Thrive — How to build raised beds (PDF) (retrieved 20.10.2026)
  6. Galvanizers Association — EN ISO 1461 (retrieved 20.10.2026)
  7. legislation.gov.uk — Consumer Rights Act 2015, section 11 (retrieved 20.10.2026)
  8. Planning Portal — Outbuildings (retrieved 20.10.2026)