Pond Liners

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    Pond Liners & Underlay for Every Garden Pond

    Every pond that lasts starts with the right liner. We've spent over 20 years at AllPondSolutions helping people line everything from small wildlife pools to large koi and ornamental ponds, and ours are built to go the distance — flexible enough to mould to any shape, tough enough to hold water for decades. Pick a lightweight 0.3mm LDPE liner with a 25-year warranty for most garden ponds, or a heavy-duty 300gsm HDPE liner guaranteed for 40 years when you're building big and building once. Pair either with a protective underlay for a watertight base you can rely on. Browse the full range below — all with fast, free UK delivery.

    Buying guide: how to choose & size your pond liner

    Get the size right first. Measure your pond's longest length, widest width and deepest point, then add twice the depth to both the length and the width so the liner reaches up and over the edges with enough spare to tuck under your edging. It's always better to order a little large and trim the excess than to come up short once the pond is filled and the liner has settled — a liner that's tight in one corner can't be stretched later. Our pond liner size calculator works it out for you in seconds.

    LDPE or HDPE? LDPE (0.3mm, 25-year warranty) is the flexible, cost-effective choice for most garden and wildlife ponds. HDPE (a true 300gsm, 40-year warranty) is a thicker, heavier film for large or permanent ponds you want to build once and forget. Lay either over a non-woven underlay — it shields the liner from stones and roots, and it's required for the warranty to apply.

    41 products

    Not sure which liner?

    What size do I need?

    Use our pond liner size calculator – a liner that's short on one side can't be fixed once the pond is dug

    HDPE or LDPE?

    HDPE is heavy-duty 300gsm with a 40-year warranty; LDPE is 0.3mm with a 25-year warranty

    Do I need underlay?

    Yes – it stops stones and roots working through the liner, and both the HDPE and LDPE warranties need it

    Which underlay?

    Thick 2–3mm with tear and puncture resistance, or 150gsm non-woven in sizes up to 2 x 15m

    What Are Pond Liners?

    A fish pond liner is a material that stops the water from leaking out from the base of your garden pond.

    They're crucial for quality natural ponds, manufactured garden water features and any outdoor fish habitat!

    Good fish pond liners for sale don't just retain the water but keep debris to a minimum and resist a build-up of sediment, ensuring the water quality remains in good condition.

    Why Should I Buy Pond Liners?

    Pond lining is vital since it will prevent water loss and preserve the condition of your garden soil.

    Without liners for ponds, water features will leak into the ground, incurring ongoing costs to refill the water level in your pond and keep your fish and other aquatic species healthy.

    Liner for ponds can deteriorate, so if you notice your water level falling, it may well be time to upgrade to one of the many types of contemporary garden pond liners stocked at AllPondSolutions!

    What Are the Main Types of Pond Liners?

    Our pond lining range includes LDPE Pond Liners. This cost-effective fish pond liner is made from low-density polyethylene, so it is durable, flexible, and has a 25-year warranty.

    HDPE Pond Liners are our heaviest option, at a true 300 grams per square metre of solid smooth film.

    Made from 100% virgin high-density polyethylene with a 5% carbon black UV stabiliser, these heavy-duty pond liners are ideal for larger ponds or any water feature you want to build once - and they carry a 40-year guarantee against UV degradation when fitted over a non-woven underlay.

    AllPondSolutions also stocks professional-quality Pond Liner Underlay, which protects from sharp edges and ensures your pond lining will last longer, with enhanced durability.

    Please browse our substantial range of fish pond liners for sale via the AllPondSolutions Pond Liners catalogue if you'd like more information about these types of garden pond liners!

    Why Buy Your Garden Pond Liner or Lining from Us?

    We know that choosing the right pond liner online can be challenging and that's why we have included a handy pond liner size calculator to make sure that you are 100% satisfied with your purchase. Our mission is to provide our customers with a stress free shopping experience by being a one stop shop for pond underlay, pond liners and accessories.

    Whether you are looking for an LDPE pond liner, an HDPE pond liner, pond liner underlay or a repair kit for your pond liner, we can help. We have over 20 years of experience and are always happy to offer expert advice.

    Shop Online for Small, Medium & Large Pond Liners & Liner Accessories

    We are passionate about ponds and that's why you will only find products of the highest quality on our site. Browse our collection of large and small pond liners for sale online with us today. Find the perfect pond liner from one of the following: