A. A fibreglass (GRP) koi pond lining is a waterproof system made from layers of glass-reinforced resin applied directly to the pond shell. Once cured, it creates a seamless, smooth finish that prevents leaks and protects against water pressure, algae and roots. GRP linings are extremely strong, long-lasting and easy to maintain, which is why they’re preferred for high-value koi ponds where water quality and reliability matter most.
A. Koi pond prices vary depending on size, shape, access and how much preparation is required. Because every pond is different, the best way to get a price is to get in touch for a free, individual quote. We assess the build, identify any preparation needed and provide a fixed price before work begins. While GRP is more of an investment than liners or paint, it delivers unbeatable reliability, performance and lifespan.
A. Absolutely — fibreglass bonds extremely well to stable substrates such as concrete, blockwork, rendered ponds and even older waterproofing systems. We grind, clean and stabilise the surface, repair any cracks or voids, then laminate and topcoat the pond to create a solid, watertight shell. Whether you’re building a new pond or upgrading an old one, GRP offers a permanent, reliable finish.
A. A professionally installed fibreglass lining will typically last 20–30+ years — and often much longer. It does not tear like liners, peel like paint, or fail at seams like other waterproofing methods. Many ponds that were fibreglassed decades ago are still performing perfectly. With basic care and proper construction beneath, GRP is a once-in-a-lifetime solution for most koi keepers.
A. Most koi pond fibreglass installations are completed in 2–4 days, depending on size, access and weather. If repairs or rendering are required, timescales may be slightly longer. GRP requires dry conditions and certain temperatures, so outdoor ponds are weather dependant. We’ll keep you updated, protect your build from rain if needed, and get the lining finished as quickly — and correctly — as possible.
A. Very little. The smooth topcoat helps control algae, prevents biofilm collecting in corners and makes brushing safe for delicate koi skin. Regular cleaning, balanced water and filtration are usually all that’s needed. If the surface becomes scratched or worn years down the line, GRP can be repaired or re-topcoated locally without stripping the entire pond — something no liner can offer.
A. Fibreglass provides a seamless, non-toxic, completely waterproof barrier. Unlike rubber liners, PVC or paints, it cannot rip, stretch or degrade under UV, temperature change or fish movement. GRP is also chemically inert, meaning it won’t leach into the water and is safe for koi and filtration systems. Professional installation ensures a perfect bond to your pond structure, protecting your investment and giving years of trouble-free use.
A. Yes — GRP is widely used in koi ponds and commercial aquaculture systems. Once cured, fibreglass is completely inert and non-toxic, making it safe for koi, other fish species and biological filtration systems. The smooth finish stops algae taking hold, protects koi from abrasions and prevents bacteria hiding in folds or seams. Most hobbyists choose GRP specifically because it supports healthier water and easier maintenance.
A. Rendering is not always required before fibreglassing a koi pond. GRP can be installed onto blockwork, concrete or other solid structures once the surface is cleaned, filled and made stable. However, applying a smooth render does give a better final finish, reduces preparation time on rough surfaces, and helps ensure the laminate bonds perfectly. If your pond isn’t rendered, we assess the condition during your survey and explain whether it’s suitable as it is or if light preparation work will improve the long-term result.
A. Yes — fibreglass can accommodate almost any design, including shelves, steps, bottom drains, pipe penetrations and viewing windows. Because GRP is applied on site and cures as one piece, it moulds to your pond’s shape and seals awkward areas where liners struggle. We take time around penetrations and details to ensure the finish is completely watertight and built to last.
A. Yes — we regularly restore leaking ponds, fix cracks and overlay failed paints or liners. In many cases, we can apply GRP directly over the existing surface after preparation, which saves time and avoids a full rebuild. If the structure beneath is damaged, we identify the issue and provide repair options before laminating. Our focus is to solve the problem properly and permanently.
A. We install and refurbish koi ponds across Kent, including Ashford, Maidstone, Folkestone, Canterbury, Dover, Sittingbourne, Medway, Tunbridge Wells, Thanet and nearby areas. We work on new builds, restorations, hobby ponds, commercial systems and natural water features. If you’re unsure whether we cover your location, get in touch — we can often provide advice or a quote from photos and measurements.
A. A fibreglass (GRP) koi pond lining is a waterproof system made from layers of glass-reinforced resin applied directly to the pond shell. Once cured, it creates a seamless, smooth finish that prevents leaks and protects against water pressure, algae and roots. GRP linings are extremely strong, long-lasting and easy to maintain, which is why they’re preferred for high-value koi ponds where water quality and reliability matter most.
A. Koi pond prices vary depending on size, shape, access and how much preparation is required. Because every pond is different, the best way to get a price is to get in touch for a free, individual quote. We assess the build, identify any preparation needed and provide a fixed price before work begins. While GRP is more of an investment than liners or paint, it delivers unbeatable reliability, performance and lifespan.
A. Absolutely — fibreglass bonds extremely well to stable substrates such as concrete, blockwork, rendered ponds and even older waterproofing systems. We grind, clean and stabilise the surface, repair any cracks or voids, then laminate and topcoat the pond to create a solid, watertight shell. Whether you’re building a new pond or upgrading an old one, GRP offers a permanent, reliable finish.
A. A professionally installed fibreglass lining will typically last 20–30+ years — and often much longer. It does not tear like liners, peel like paint, or fail at seams like other waterproofing methods. Many ponds that were fibreglassed decades ago are still performing perfectly. With basic care and proper construction beneath, GRP is a once-in-a-lifetime solution for most koi keepers.
A. Most koi pond fibreglass installations are completed in 2–4 days, depending on size, access and weather. If repairs or rendering are required, timescales may be slightly longer. GRP requires dry conditions and certain temperatures, so outdoor ponds are weather dependant. We’ll keep you updated, protect your build from rain if needed, and get the lining finished as quickly — and correctly — as possible.
A. Very little. The smooth topcoat helps control algae, prevents biofilm collecting in corners and makes brushing safe for delicate koi skin. Regular cleaning, balanced water and filtration are usually all that’s needed. If the surface becomes scratched or worn years down the line, GRP can be repaired or re-topcoated locally without stripping the entire pond — something no liner can offer.
A. Fibreglass provides a seamless, non-toxic, completely waterproof barrier. Unlike rubber liners, PVC or paints, it cannot rip, stretch or degrade under UV, temperature change or fish movement. GRP is also chemically inert, meaning it won’t leach into the water and is safe for koi and filtration systems. Professional installation ensures a perfect bond to your pond structure, protecting your investment and giving years of trouble-free use.
A. Yes — GRP is widely used in koi ponds and commercial aquaculture systems. Once cured, fibreglass is completely inert and non-toxic, making it safe for koi, other fish species and biological filtration systems. The smooth finish stops algae taking hold, protects koi from abrasions and prevents bacteria hiding in folds or seams. Most hobbyists choose GRP specifically because it supports healthier water and easier maintenance.
A. Rendering is not always required before fibreglassing a koi pond. GRP can be installed onto blockwork, concrete or other solid structures once the surface is cleaned, filled and made stable. However, applying a smooth render does give a better final finish, reduces preparation time on rough surfaces, and helps ensure the laminate bonds perfectly. If your pond isn’t rendered, we assess the condition during your survey and explain whether it’s suitable as it is or if light preparation work will improve the long-term result.
A. Yes — fibreglass can accommodate almost any design, including shelves, steps, bottom drains, pipe penetrations and viewing windows. Because GRP is applied on site and cures as one piece, it moulds to your pond’s shape and seals awkward areas where liners struggle. We take time around penetrations and details to ensure the finish is completely watertight and built to last.
A. Yes — we regularly restore leaking ponds, fix cracks and overlay failed paints or liners. In many cases, we can apply GRP directly over the existing surface after preparation, which saves time and avoids a full rebuild. If the structure beneath is damaged, we identify the issue and provide repair options before laminating. Our focus is to solve the problem properly and permanently.
A. We install and refurbish koi ponds across Kent, including Ashford, Maidstone, Folkestone, Canterbury, Dover, Sittingbourne, Medway, Tunbridge Wells, Thanet and nearby areas. We work on new builds, restorations, hobby ponds, commercial systems and natural water features. If you’re unsure whether we cover your location, get in touch — we can often provide advice or a quote from photos and measurements.