Premium Pond Liners & Accessories
Fish-Safe • Lifetime Guarantee • Free UK Delivery on Every Order
Pond liner calculator
Enter your pond's longest length, widest width and deepest point. We'll match it to the liner sizes we stock.
Free delivery on every order. No minimum spend.
Whether it's a small liner for a wildlife pond or a complete koi pond kit, delivery to your UK address costs nothing. Most UK pond specialists only drop the delivery charge once your basket passes £49 to £100.
Spend needed before delivery is free
Free-delivery thresholds published on the websites of five leading UK pond retailers, October 2026.
Shop by Liner Type
From heavy-duty EPDM to flexible PVC — find the perfect liner for your pond project.
EPDM Pond Liners
The UK's favourite pond liner. Incredibly flexible, UV resistant, and safe for all aquatic life.
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HDPE Pond Liners
Industrial grade strength for large ponds and commercial projects.
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PVC Pond Liners
Lightweight, easy to install, and great value for garden ponds.
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Butyl Pond Liners
Premium rubber. The professional's choice for decades.
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Pond Equipment
Filters, pumps & UV clarifiers at unbeatable prices.
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Pre-Formed Ponds
Ready to install kits. Perfect for beginners.
Shop NowMost popular pond liners
The liners and kits our customers order most, with every size and price on the product page.
Save 20%HDPE Pond Liner
Save 20%HDPE Pond Liner
Save 19%Polyex Pond Liner
Save 20%HDPE Pond Liner UK
Save 19%Flexible LDPE Pond Liner UK
Save 20%Budget LDPE Pond Liner UK
Save 20%LDPE Pond Liner 0.35mm
Save 20%Small Garden Pond Liner UK
Liner length = pond length + 2 × max depth + 2 × overlap
Liner width = pond width + 2 × max depth + 2 × overlap
How to measure for a pond liner
Liners are cut to size, so the measurement matters more than anything else you choose. Dig first, then measure the hole, not the plan.
Measure the longest length and widest width
Run a tape across the top of the hole at its longest and widest points, even if the pond is curved or kidney-shaped. A liner is always a rectangle.
Add twice the deepest point
The liner has to go down one side and back up the other, so add the maximum depth twice to both the length and the width. Shelves don't change this.
Add an overlap for the edge
Allow 30cm each side to bury or trap under edging, or 50cm if you're laying paving or rocks over it. Round up to the next stock size, never down.
Which pond liner material is right for you?
Every material we sell will hold water. The difference is how it handles shape, folds, cold and budget. Here's how they compare.
Most flexibleEPDM rubber
from £209.99Synthetic rubber that stays supple in frost and folds neatly into curves and shelves. The usual choice for fish and koi ponds.
- 0.75mm & 1.0mmThickness
- 25 years to lifetimeGuarantee
- Koi & fish ponds, curved shapesBest for
Premium rubberButyl rubber
from £112.99Heavy, soft rubber that drapes into complex shapes with neat folds. A traditional choice for ornamental and formal ponds.
- 0.75mmThickness
- 20 years to lifetimeGuarantee
- Formal ponds & complex shapesBest for
Large pondsHDPE
from £25.42Tough, stiff polyethylene sheet that's light for its size. Strong value on big ponds and lakes with simple, gently sloping sides.
- 0.35mm & upThickness
- 25 to 40 yearsGuarantee
- Large ponds, lakes & simple shapesBest for
Budget pickLDPE
from £19.33Softer polyethylene that folds more easily than HDPE. A low-cost way to line wildlife ponds and first ponds.
- 0.3 – 0.35mmThickness
- 15 to 40 yearsGuarantee
- Wildlife ponds & tight budgetsBest for
Easy to foldPVC
from £25.98Light, flexible sheet that's easy to handle on your own and folds tidily into small and medium garden ponds.
- 0.3 – 0.5mmThickness
- 15 years to lifetimeGuarantee
- Small & medium garden pondsBest for
ReversiblePolyex
from £74.89Reversible liner with a black side and a brown side, so you can choose a natural, earth-coloured finish for your pond.
- 0.5mmThickness
- LifetimeGuarantee
- Natural-looking garden pondsBest for
Stop Wasting Money on Cheap Liners That Leak
Most pond liners crack, leak, or degrade within a few years. Ours are built to last decades — guaranteed.
Cheap Liners Crack & Leak
Budget PVC and low-grade liners degrade under UV exposure, leading to costly leaks within 2-3 years.
Toxic Materials Kill Fish
Many liners contain chemicals that leach into water, poisoning fish and wildlife in your pond.
EPDM That Lasts 20+ Years
Our premium EPDM rubber liners are UV-resistant, flexible in all temperatures, and backed by a 25-year guarantee.
100% Fish-Safe Certified
Every liner we sell is independently tested and certified safe for koi, goldfish, and all aquatic wildlife.
Free Next-Day UK Delivery
Order before 2pm for free next-day delivery. No minimum spend, no hidden charges.
Free Expert Advice
Not sure what you need? Our pond specialists will recommend the perfect liner, size, and accessories — free via WhatsApp.
What are you building?
Different ponds need different liners. Start from your project and we'll point you to the materials that suit it.
Wildlife pond
Shallow shelves and a gently sloping beach. Flexible LDPE and PVC fold neatly into the curves.
Shop wildlife liners →
Fish & koi pond
Deeper water and heavier use. EPDM rubber over a thick underlay is the usual choice.
Shop EPDM liners →
Small garden pond
Patio ponds, water features and first ponds, from compact ready-cut sizes.
Shop small pond liners →
Large pond or lake
Big spans and simple shapes. HDPE sheet in large sizes, with trade quotes on request.
Shop large liners →Everything else your pond needs
Pumps, filters, water care and winter kit, delivered free with your liner or on their own.
Built on 20 Years of Pond Expertise
We're passionate pondkeepers who've served over 200,000 customers across the UK. Every product is rigorously tested, every liner is backed by our industry-leading guarantee, and our expert team is always ready to help you build the perfect pond.
- Premium EPDM, PVC, Butyl & HDPE liners
- Free UK delivery on all orders
- Up to 25 year manufacturer guarantee
- Expert advice from real pond specialists
Lining something bigger?
Building for a client, lining a lake or ordering for several ponds? Send us the sizes and we'll put liner, underlay and equipment on one quote.
- Ask about sizes larger than our listed range
- Liner, underlay and equipment quoted together
- Free UK delivery to site or to your yard
Not sure which liner to buy?
Tell us the size, shape and what's going in the pond, and we'll recommend the liner, underlay and size to order before you spend anything.
- 01282 270214 · Mon–Fri 08:30–17:00
- WhatsApp us a photo and your measurements
- sale@pondlinersco.co.uk
PondLinersco.co.uk · Unit 1B Summit Works, Manchester Road, Burnley, Lancashire BB11 5HG
Pond Liner Guides & Advice
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Read Guide →Pond liner questions, answered
The questions we're asked most often before someone orders a liner.
How do I work out what size pond liner I need?
Measure the longest length and widest width of the hole, then add twice the maximum depth and twice your edge overlap to each. For example, a pond 3m long, 2m wide and 0.6m deep with a 30cm overlap needs a liner of at least 4.8m × 3.8m. Our pond liner calculator does the sum for you and shows the stock sizes that fit.
Which pond liner material should I choose?
EPDM and butyl rubber are the most flexible and the easiest to fold into curved, shelved or fish ponds. HDPE is stiffer and suits large ponds with simple shapes. LDPE and PVC are lighter, lower-cost options for wildlife and small garden ponds. Compare them above, or ask us and we'll recommend one.
Do I need underlay under my pond liner?
We recommend it under every liner. Underlay sits between the soil and the liner and protects it from stones and roots. Our 200gsm geotextile underlay comes in sizes to match, our liner kits include it, and some HDPE liners come with it free.
How deep should my pond be?
Wildlife ponds work best with shallow shelves of 10–30cm and a deepest point of around 60cm. Goldfish ponds are usually 60–90cm deep, and koi ponds deeper still, often 1.2m or more. Enter your deepest point in the calculator; shelves don't change the liner size.
How much is delivery?
Delivery is free on every UK order with no minimum spend, whether you order a liner, underlay, a kit or equipment. See our shipping policy for dispatch and delivery details.
Can I return a pond liner?
Pond liners are cut to size for your order, so they are non-returnable. That's why it's worth checking your measurements with the calculator, or with us, before you order. Other items can be returned within 14 days in their original condition, and if anything arrives damaged, send us a photo within 24 hours. Read the full returns policy.
What does the liner guarantee cover?
Each liner carries the guarantee shown on its product page, from 15 years up to lifetime depending on the material and grade. Guarantees are manufacturer warranties covering material or manufacturing defects, so keep your order confirmation safe.
Are your liners safe for fish and wildlife?
Yes. The pond liners we sell are suitable for fish, plants and wildlife. Rinse the liner, let the pond settle before adding fish, and use a dechlorinator if you fill it from the tap.
Do you supply landscapers and trade customers?
Yes. For larger projects, several ponds or sizes beyond our listed range, send us your measurements and we'll quote liner, underlay and equipment together. Request a quote or call 01282 270214.
Ready to Build the Perfect Pond?
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