450gsm Black PVC Pond Liners

Flexible black PVC, 450gsm and 0.3mm thick, for garden ponds and water features: more than twice the material weight of our 200gsm PE liners, and safe for fish.

Fourteen sheet sizes from 1m x 1m to 8m x 8m, each sold on its own or with 50gsm underlay to match, and a calculator to find your size.

  • 14 sizes, 1m x 1m to 8m x 8m
  • Underlay option
Plan your pond Find my liner size
Finished garden pond lined with black PVC, with planting on the shelf and stone edging

Choose your liner size

  • Folded black PVC pond liner on white

    Black PVC Pond Liner, 450gsm - Flexible Liner for Garden Ponds and Water Features, 14 Sizes from 1m x 1m to 8m x 8m

    Black PVC Pond Liner, 450gsm - Flexible Liner for Garden Ponds and Water Features, 14 Sizes from 1m x 1m to 8m x 8m

    From £6.89
    From £6.89
  • 1m x 1m black PVC pond liner, 450gsm, folded with its label

    1m x 1m Black PVC Pond Liner, 450gsm - Flexible Liner for Small Water Features, Container Ponds and Spare Patch Sheets

    1m x 1m Black PVC Pond Liner, 450gsm - Flexible Liner for Small Water Features, Container Ponds and Spare Patch Sheets

    From £6.89
    From £6.89
  • 2.5m x 2.5m black PVC pond liner, 450gsm, folded with its label

    2.5m x 2.5m Black PVC Pond Liner, 450gsm - Flexible Liner for Small Wildlife Ponds

    2.5m x 2.5m Black PVC Pond Liner, 450gsm - Flexible Liner for Small Wildlife Ponds

    From £18.39
    From £18.39
  • 2.5m x 3m black PVC pond liner, 450gsm, folded with its label

    2.5m x 3m Black PVC Pond Liner, 450gsm - Flexible Liner for Small Wildlife and Patio Ponds

    2.5m x 3m Black PVC Pond Liner, 450gsm - Flexible Liner for Small Wildlife and Patio Ponds

    From £20.89
    From £20.89
  • 2.5m x 5m black PVC pond liner, 450gsm, folded with its label

    2.5m x 5m Black PVC Pond Liner, 450gsm - Flexible Liner for Long, Narrow Ponds and Rills

    2.5m x 5m Black PVC Pond Liner, 450gsm - Flexible Liner for Long, Narrow Ponds and Rills

    From £30.89
    From £30.89
  • 2.5m x 10m black PVC pond liner, 450gsm, folded with its label

    2.5m x 10m Black PVC Pond Liner, 450gsm - Flexible Liner for Canal Ponds and Long Streams

    2.5m x 10m Black PVC Pond Liner, 450gsm - Flexible Liner for Canal Ponds and Long Streams

    From £55.79
    From £55.79
  • 3m x 3m black PVC pond liner, 450gsm, folded with its label

    3m x 3m Black PVC Pond Liner, 450gsm - Flexible Liner for Small Garden Ponds with a Planting Shelf

    3m x 3m Black PVC Pond Liner, 450gsm - Flexible Liner for Small Garden Ponds with a Planting Shelf

    From £23.89
    From £23.89
  • 3m x 4m black PVC pond liner, 450gsm, folded with its label

    3m x 4m Black PVC Pond Liner, 450gsm - Flexible Liner for Small Garden and Wildlife Ponds with Shelves

    3m x 4m Black PVC Pond Liner, 450gsm - Flexible Liner for Small Garden and Wildlife Ponds with Shelves

    From £29.89
    From £29.89
  • 4m x 4m black PVC pond liner, 450gsm, folded with its label

    4m x 4m Black PVC Pond Liner, 450gsm - Flexible Liner for Medium Garden Ponds with Shelves

    4m x 4m Black PVC Pond Liner, 450gsm - Flexible Liner for Medium Garden Ponds with Shelves

    From £37.89
    From £37.89
  • 4m x 5m black PVC pond liner, 450gsm, folded with its label

    4m x 5m Black PVC Pond Liner, 450gsm - Flexible Liner for Medium Garden and Wildlife Ponds

    4m x 5m Black PVC Pond Liner, 450gsm - Flexible Liner for Medium Garden and Wildlife Ponds

    From £45.89
    From £45.89
  • 4m x 6m black PVC pond liner, 450gsm, folded with its label

    4m x 6m Black PVC Pond Liner, 450gsm - Flexible Liner for Medium Garden and Small Fish Ponds

    4m x 6m Black PVC Pond Liner, 450gsm - Flexible Liner for Medium Garden and Small Fish Ponds

    From £53.89
    From £53.89
  • 5m x 5m black PVC pond liner, 450gsm, folded with its label

    5m x 5m Black PVC Pond Liner, 450gsm - Flexible Liner for Larger Garden Ponds

    5m x 5m Black PVC Pond Liner, 450gsm - Flexible Liner for Larger Garden Ponds

    From £55.79
    From £55.79
  • 5m x 6m black PVC pond liner, 450gsm, folded with its label

    5m x 6m Black PVC Pond Liner, 450gsm - Flexible Liner for Larger Ponds with Marginal Shelves

    5m x 6m Black PVC Pond Liner, 450gsm - Flexible Liner for Larger Ponds with Marginal Shelves

    From £65.79
    From £65.79
  • 6m x 6m black PVC pond liner, 450gsm, folded with its label

    6m x 6m Black PVC Pond Liner, 450gsm - Flexible Liner for Large Garden and Fish Ponds

    6m x 6m Black PVC Pond Liner, 450gsm - Flexible Liner for Large Garden and Fish Ponds

    From £77.79
    From £77.79
  • Sold out
    8m x 8m black PVC pond liner, 450gsm, folded with its label

    8m x 8m Black PVC Pond Liner, 450gsm - Flexible Liner for Large, Deep Fish Ponds

    Sold out

    8m x 8m Black PVC Pond Liner, 450gsm - Flexible Liner for Large, Deep Fish Ponds

    From £142.19
    From £142.19
    Sold out

What size pond liner do I need?

Enter your pond dimensions in metres to find the liner size you need.

Pond liner length and depth diagramA schematic cross-section shows liner following the sides and base, with spare material at both edges. Width is calculated in the same way. Pond length Depth Required sheet length EdgeEdge

Sheet length = pond length + 2 x depth + 2 x edge allowance. Width uses the same sum. Not to scale.

From hole to finished pond

Four steps from measuring the hole to running a pump.

  1. Size it from the hole

    Measuring across a freshly dug pond hole

    Measure the longest, widest and deepest points; the calculator above suggests a sheet with 30cm spare at every edge. Sizes are cut sizes and can vary by up to 3%, so at a sheet's limit choose the next size up. Every size is in our pond liner size guide.

  2. Cushion it with underlay

    Pond hole with a shelf lined with black fabric underlay

    A pond liner should always sit on underlay, never straight on soil. Every size has a With underlay option with the 50gsm fabric to suit; if you already have underlay, choose Liner only.

  3. Lay it and fill it

    Hose filling the lined pond with the liner edge held by bricks

    Ease the sheet into the hole with spare all round, hold the edge with bricks you can move and fill slowly. Trim only once it has settled, then hide the edge under stones, slabs or turf.

  4. Connect a pump or filter

    Pond hose joint with a double wire clip

    Corrugated pond hose, barbed fittings and matching double wire clips from 13mm to 50mm: see our hose and fittings guide, or plan the whole pond.

Underlay to match

50gsm fabric sheets that cushion the liner against stones and roots, if you choose Liner only.

Black PVC pond liner questions

How much underlay do I need?

The With underlay option on every size includes the right amount. For Liner only, each size needs:

  • 1m x 1m: one 1m x 1m sheet
  • 2.5m x 2.5m and 3m x 3m: one 3m x 3m
  • 2.5m x 3m, 3m x 4m and 2.5m x 5m: one 3m x 5m
  • 2.5m x 10m: one 3m x 10m
  • 4m x 4m, 4m x 5m, 4m x 6m, 5m x 5m and 5m x 6m: two 3m x 5m
  • 6m x 6m: four 3m x 3m
  • 8m x 8m: three 3m x 10m
How big a pond does each sheet make?

With 30cm spare at the edge, a 3m x 3m sheet builds a pond about 1.5m x 1.5m and 45cm deep, a 4m x 5m about 2.2m x 3.2m and 60cm deep, and an 8m x 8m about 5.6m x 5.6m and 90cm deep. The 1m x 1m suits a patio feature or container pond about 40cm across. Use the calculator above for your own pond, or see every size in our pond liner size guide.

What do 450gsm and 0.3mm mean?

450gsm is the weight of each square metre of PVC, more than twice our 200gsm PE liners, and 0.3mm (300 microns) is its thickness.

Can I join two sheets for a bigger pond?

We recommend one sheet per pond. Two sheets need joining tape or adhesive to make a watertight seam, and we do not sell either. For a pond bigger than 8m x 8m covers, see our EPDM liners, up to 10m x 10m.

Is it safe for fish?

Yes. The liner is safe for fish and other pond life.

Will it stand up to sunlight?

Yes. The PVC is UV resistant and should last for many years in a garden pond. Like all plastics it ages slowly in sunlight, faster in full sun than in shade or under water, so cover the edge with stones, slabs or turf to protect it.

Should I choose PVC, EPDM or PE?

450gsm PVC is a tougher sheet than PE at a mid price. For the lowest cost per square metre see our 200gsm PE pond liners; for stretching over deep shelves and tight curves, our 1100gsm EPDM liners.

What's included?

One black PVC liner in the size you choose, folded and bagged. With underlay adds the 50gsm fabric underlay to suit that size.