Pond liner guides
Step-by-step articles on planning, sizing and installing a reinforced pond liner.
Choosing between materials before you read a how-to? Start with the pond liner materials hub for standalone buyer's guides to EPDM, butyl, PVC, HDPE, RPE and fibreglass, or jump straight to the side-by-side comparison. Sizing a small garden pond? See our small pond liners guide.
How thick should a pond liner be?
Thickness rules of thumb by pond size and material — and why 0.7 mm reinforced beats 1.0 mm unreinforced every time.
Read guidePond Liner Underlay — Do You Really Need It?
Short answer: yes. Long answer: which weight, when sand pays off, and the one place people always skimp.
Read guideHow to measure your pond for a liner
The exact formula installers use — length, width, twice the depth, plus a 30 cm overlap. Worked example included.
Read guidePond liner vs preformed pond
Preformed shells are quick but inflexible. Liners take more planning but last longer and look natural. Which is right for you?
Read guideHow long do pond liners last?
Realistic UK lifespans by material — RPM, EPDM, butyl, PVC, HDPE — and the three things that actually decide whether a liner makes its design life.
Read guideTypes of pond liners
Flexible vs rigid, reinforced vs unreinforced, weldable vs taped — the full taxonomy of UK pond liners and where each one earns its place.
Read guideHow much do pond liners cost?
What actually drives the £/m² figure, honest ballpark ranges by material, and how underlay and fitting change the installed cost.
Read guideWhat are pond liners made of?
Polymer chemistry in plain English — what's inside EPDM, butyl, PVC, HDPE and reinforced polymer — and why pond liners are almost always black.
Read guideHow to repair a pond liner
Patch kits, primers and the right adhesive or sealant per material — plus when a repair is genuinely worth it and when relining is the better answer.
Read guideCan you overlap and join pond liners?
Yes, but overlapping alone won't hold water. The honest answer on welding vs taping vs splicing — and why reinforced polymer is welded.
Read guideThe best pond liner: a UK buyer's guide
There is no single 'best' pond liner — there is a best one for your pond. How to choose, what to ignore, and where UK pond liners are actually sold.
Read guideDo pond liners stretch? And other myths, answered
Do pond liners stretch? Leak? Need replacing every few years? A myth-busting Q&A that sorts the genuine concerns from the garden-centre folklore.
Read guideReady for a reinforced pond liner that lasts?
RPM is the reinforced pond liner material trusted by installers across the country — 0.7 mm polymer membrane, koi-safe, 45-year lifespan.