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Wildlife pond liner

Updated: 22 October 2026

You want a shallow pond for plants, amphibians, and invertebrates, and the listing in the other tab is written like a koi pool: deep, bare at the rim, and thin enough that a stone shows through. A wildlife pond liner is chosen for a beach and a covered edge, not for a fish-pond depth. The twelve amazon.co.uk sheets, with GBP prices, are on the [pond liner comparison](/hub/garden-ponds/pond-liner). Peter F. used those listings and the charity pages below, and did not build a pond. Depths stay with the organisation that printed them. The page was written on 21 October 2026. A qualifying purchase can earn us a commission at no extra cost to you.

You want a shallow pond for plants, amphibians, and invertebrates, and the listing in the other tab is written like a koi pool: deep, bare at the rim, and thin enough that a stone shows through.

Our top picks

PondKraft PondKraft 4 m × 4 m pond liner

Best overall

PondKraft PondKraft 4 m × 4 m pond liner
9.2/10about £28.99
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Storystore Storystore 3 m × 3 m pond liner

Best value

Storystore Storystore 3 m × 3 m pond liner
8.8/10about £14.99
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GARDENIX GARDENIX 1 m × 1 m pond liner

Rank 3

GARDENIX GARDENIX 1 m × 1 m pond liner
8.6/10about £6.72
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On this page
  1. 1.Shallow on purpose
  2. 2.A beach, then cover the sheet
  3. 3.Water and plants before fish
  4. 4.What that means for these sheets

Shallow on purpose

If you are not keeping fish, the Freshwater Habitats Trust says the deepest area need be no more than 25–30 cm, with shallows of a couple of centimetres at the margin. The RHS wildlife page says about 20–60 cm, varying, and at least one long shallow slope. Those ranges are not an average of 40 cm, and they are not a koi depth. The beach is the way out for a frog, a newt, or a hedgehog. A vertical wall with the liner cut to the waterline is a trap even at 25 cm. Mark the slope before you order, because the slope uses liner. How to add twice the depth is on how to fit a pond liner. The Planning Portal says most garden ponds need no application, and that a particularly large or deep pond, flood risk, and protected species are separate questions.

A beach, then cover the sheet

Dig the slope as part of the hole. The Wildlife Trusts describe a sloping beach, about 5 cm of sand, a trench, and rainwater if you can get it. The RHS suggests gravel or flat stones so animals can grip. Put that stone on the liner only where sand or fleece is already under the sheet. Reviews of the thin films blame gravel and stones for holes. Cover the liner. The Trusts say butyl left in the sun degrades, so the edge is buried or capped. Turf or fleece that runs from the water to the bank can wick the pond empty. Follow one step order. The Trusts snip spare liner earlier than the RHS fill-then-cut sequence, and these films do not stretch into a beach the way butyl does. The material difference is on EPDM or HDPE pond liner.
PondKraft PondKraft 4 m × 4 m pond liner

Testsieger

PondKraft PondKraft 4 m × 4 m pond liner
9.2/10about £28.99
View offer

Water and plants before fish

Rainwater is the fill the Trust and the RSPB prefer, because tap water carries nutrients that feed algae. Do not add fish if this pond is for amphibians. Amphibian and Reptile Conservation, and Sussex Wildlife Trust, say fish eat spawn, tadpoles, and invertebrates. GOV.UK's ILFA list does not give koi its own line. Great crested newts are a stop. GOV.UK says filling ponds and adding fish can harm them. If you find newts, stop. A thicker sheet does not remove that duty.

What that means for these sheets

Freshwater Habitats Trust names butyl, EPDM, or PVC. The Wildlife Trusts prefer butyl. These twelve rows are HDPE or LDPE. None is that rubber. For a beach pond in the ground, buy the rubber or PVC those pages name unless you accept thinner plastic and protect it. The trade-off is on the pond liner buying guide. GARDENIX, 1 m by 1 m at 200 gsm and £6.72, is the sheet sized for a container or a tiny patch. It names no polymer and includes no underlay, and some reviews name a larger size than 1 m. The 0.1 mm rows are a poor match for a beach. PondKraft is still LDPE at 0.35 mm if a shallow rectangle fits 4 m by 4 m after overlap. Do not crown any of the twelve as a wildlife liner.

Common questions

How deep should this pond be if I am not keeping fish?
The Freshwater Habitats Trust says no more than 25–30 cm at the deepest point, with shelves of a couple of centimetres at the edge. The RHS wildlife page says about 20–60 cm, varying, plus one long shallow slope. Use one source and name it. Neither figure is a koi depth, and neither is an average between them. The slope is part of the liner size.
Why do the RHS and the Freshwater Habitats Trust not print the same depth?
They are answering slightly different briefs. The Trust's 25–30 cm line is a maximum when you are not keeping fish. The RHS line is a varying depth that still needs a shallow side. Both want shallows. A single deep hole with vertical sides matches neither page. If you later add fish, you have left this design.
Should I add fish later?
Not if the pond is for amphibians. ARC and Sussex Wildlife Trust say fish eat spawn, tadpoles, and invertebrates. Add fish and you have a shallow fish pond, which is a poor home for both. Koi are not given their own line on the GOV.UK ILFA exemption list. A liner bullet that says koi does not decide the law.
Is a 0.1 mm sheet a wildlife liner because the title says wildlife?
No. The 0.1 mm listings are HDPE film. Saved UK reviews call them greenhouse film or a bin bag, and they report holes from gravel and stones, which is the beach material. The charities name butyl, EPDM, or PVC. If the only reason to buy the film is the word wildlife, buy the rubber those pages name.
What if I might have great crested newts?
Stop if you find them. GOV.UK says filling ponds and adding fish can harm great crested newts, and the animals are protected. Much ordinary pond work is done from early November to late January, after a check. That window is not permission to press on once newts are present. Ask for advice before you dig if the habitat is already there.

Related pages

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EPDM or HDPE pond liner: these sheets are not rubber

How to fit a pond liner and when you trim the edge

Sources

Public UK sources for this comparison. Listings and prices were taken from amazon.co.uk on 21 October 2026.

  1. RHS: How to make a new pond (retrieved 21 October 2026)
  2. Freshwater Habitats Trust: frequently asked questions (retrieved 21 October 2026)
  3. Planning Portal: permissions for a garden pond (retrieved 21 October 2026)
  4. Keeping and Introduction of Fish (England and River Esk Catchment Area) Regulations 2015 (retrieved 21 October 2026)
  5. GOV.UK: introduce or keep non-native fish, lobsters and crayfish (retrieved 21 October 2026)
  6. GOV.UK: great crested newts, protection, surveys and licences (retrieved 21 October 2026)
  7. Water Garden: pond liner materials (retrieved 21 October 2026)
  8. Consumer Rights Act 2015, section 9 (retrieved 21 October 2026)