The cost of basement construction depends on several factors, including the size of the basement, the ground conditions, the intended use of the space, and the waterproofing system required. Every project is unique, so we recommend arranging a professional survey, where one of our experienced surveyors can assess your property and provide a detailed, no-obligation quotation tailored to your requirements.
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KÖSTER
With over 35 years of experience in the waterproofing industry KÖSTER BAUCHEMIE AG is an industry leading manufacturer of high-quality waterproofing products. Koster UK have gained our trust over many years of successful work, their products continue to provide our technicians with the best tools in the trade to complete their projects. Below is an overlook of some of our most used Koster Products:
Koster NB1 Grey waterproofing Slurry
Koster NB 1 Grey Crystallizing mineral waterproofing slurry system is designed to seal against pressurized water (>13 bar). This product is a mineral coated waterproofing slurry that contains crystallising and capillary-plugging agents.
Koster NB1 can be used for remediating against ground water, non-pressurized water and pressurized water. NB1 is best in class for its resistance to high pressure water and abrasion. Koster NB1 Grey Waterproofing Slurry is applied using either a brush or our own specially designed Koster spraying machine, the advantage of which is that the spraying machine applies the product under pressure and greatly reduces the overall time of applying the slurry system with a high quality evenly spread surface.
Koster Repair Mortar Plus
Koster Repair Mortar Plus is designed to specifically treat weak areas of construction where water and pressurised water may be able to infiltrate a structure. Repair Mortar Plus is a highly watertight, fast setting, and slightly expandable product which provides excellent adhesion to all substrates including old building materials.
Its purpose is to be used for making watertight repairs and touch-ups. It is often applied to help combat against pressurised water via the creation of a wall/floor joint fillet, becoming part of a cementitious slurry system along with NB1 Grey.
Koster SB Bonding Emulsion
Koster SB Bonding Emulsion is an elasticizing synthetic-dispersion for universal use in mortars, plasters, sealing slurries and concrete.
SB Bonding Emulsion is a universally useable synthetic liquid that is designed to be used with all cementitious mortars, plasters and sealing slurries.
When Koster SB Bonding Emulsion is added to a mineral based product, the synthetic liquid increases the elasticity and flexibility and also reduces water absorption.
Often used as part of our system with Koster Repair Mortar Plus, Koster SB Bonding Emulsion is waterproof in its own right, meaning that it can not be washed away or rained off.
Koster Polysil TG-500
Koster Polysil TG-500 is an anti-lime solvent product which reduces the movement of free lime within a structure’s substrate. It is a deep penetrating primer for damp, salt-containing substrates and an anti-lime treatment for new concrete which also acts as a liquid hardener for sealing slurries.
Polysil TG-500 contains differing Polymers and Silicates, this product not only reduces the amount of free lime finding its way into a Cavity Drainage System, but it will also greatly improve the water resistance of the basement structure by absorption into the structure and locking in the free lime.
This product can be applied by either brush or spray.
Koster Crisin Cream – DPC (Damp Proof Course)
Koster Crisin Cream is a retroactive DPC (Damp Proof Course), damp proofing against capillary rising moisture. It can be applied inside and/or outside a structure.
This injection DPC cream is based on resin/silane which protects against capillary rising moisture/rising damp (wicking moisture). Crisin Cream is resistant against any moisture/salt content.
Koster Quellband
KÖSTER Quellband is a sodium-bentonite based water swellable joint tape with an alkalinity activated surface coating which stops premature swelling of the tape on the building site.
Koster Quellband is used to provide a stop to water ingression within concrete construction joints. The Quellband strip is nailed onto where the existing joint face is before the concrete is poured. Any water leak through the joint then activates the Koster Quellband which then reacts and breaks down, forming a paste which seals the crack and prevents the leak permanently.
Koster 21
Koster 21 is a 2-part, solvent free, elastic liquid applied, crack bridging waterproofing system that features superior adhesion to dry and moist substrates.
As Koster 21 is a liquid applied product, this greatly improves the use and application to complicated architectural details. Koster 21 also seals against synthetic oils and aliphatic hydrocarbons ectural details. 21 seals against synthetic oils and aliphatic hydrocarbons that are found in alkanes.
Koster 2in1 Crack Injection System
Koster 2in1 Crack Injection System is designed to stop active leaks and seals crack and construction joints permanently. It is used as an injection into dry and wet cracks. The product can also be used for filling voids within construction.
2in1 Crack Injection System reacts with water, it is an elastic PU-injection resin. When the product comes into contact with water, it reacts to form an elastic foam material. When it is injected under dry conditions it creates a solid body of elastic resin. The product remains in an elastic state after its initial reaction, thus meaning it can follow any movements within a crack or void, utilising its elastic polyurethane solid resin, meaning that there is no requirement to follow-up injections or treatment.
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Frequently Asked Questions
In many cases, basement waterproofing alone does not require planning permission. However, basement construction, excavation, or significant structural alterations may require planning approval and Building Regulations compliance, particularly in certain London boroughs or conservation areas. We can advise you during your survey and help you understand any permissions your project may require.
The duration of a basement waterproofing project depends on the size and complexity of the work. Smaller waterproofing installations can often be completed within a few days, while larger basement construction or full structural waterproofing projects may take several weeks. Following your survey, we’ll provide a clear project schedule so you know exactly what to expect.
There is no single waterproofing system that is suitable for every property. The most effective solution depends on factors such as the construction of the building, ground conditions, water ingress risk, and how you intend to use the basement. Our experienced surveyors will assess your property and recommend the most appropriate BS8102-compliant waterproofing system, whether that’s a Type A (barrier protection), Type C (cavity drain membrane), or a combined system for maximum protection. We only install proven products from leading manufacturers, including Delta, KÖSTER, and Sika.
Yes. We install high-quality waterproofing systems from leading manufacturers such as Delta, KÖSTER, and Sika, following BS8102 standards for below-ground waterproofing. Our waterproofing systems are fully guaranteed, giving you confidence that your basement will remain dry and protected for years to come. We’ll explain the guarantees available during your survey.
We provide basement construction and structural waterproofing services throughout London, Kent, Surrey, Essex, Sussex, and the surrounding areas. If you’re unsure whether we cover your location, simply get in touch and our team will be happy to help.
Yes. We regularly waterproof existing basements, cellars, and vaults, whether they’re affected by damp, water ingress, or you’re planning to convert the space into a dry, usable room. Every property is different, so we carry out a professional survey to identify the cause of the problem before recommending the most suitable waterproofing solution. Our systems are designed to provide long-term protection while complying with BS8102 standards for below-ground structures.
With over 50 years of experience, Universal Basement Waterproofing has designed and installed waterproofing systems for properties across London and the South East. Our experienced surveyors design BS8102-compliant waterproofing solutions using trusted systems from Delta, KÖSTER, and Sika. From initial survey through to installation, we focus on delivering long-lasting, fully guaranteed waterproofing solutions tailored to every property.
We aim to arrange surveys as quickly as possible, subject to availability. During your survey, one of our experienced waterproofing specialists will assess your basement, discuss your requirements, identify any issues with damp or water ingress, and recommend the most suitable waterproofing solution. You’ll then receive a detailed, no-obligation quotation for the work required.