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Basement Waterproofing

Basement & Cellar Waterproofing Specialists in the South West

At Biocraft South West, we specialise in basement and cellar waterproofing, helping protect properties from damp and water ingress.
Using specialist techniques, such as sump/pump and cavity drain membrane systems, alongside quality waterproofing products, we provide a variety of solutions for new and existing basements, cellars and below-ground areas.

Basement conversions are increasingly popular, creating valuable space for kitchens, offices, gyms, utility rooms, living areas and bedrooms. Ensuring these spaces remain dry and protected from water ingress is essential.

With extensive experience in basement waterproofing, our team can recommend effective solutions to help manage damp, moisture and running water.

Contact our friendly team today to discuss your basement or cellar waterproofing requirements

A dry & moisture protected basement is vital to any basement conversion. Contact our specialists CSSW engineers today to discuss waterproofing treatment today.

Contact Us

Why Do Basements Need Waterproofing?

Unlike above-ground rooms, basements and cellars are constantly exposed to moisture from the surrounding ground.

Groundwater and water under pressure can penetrate walls, floors and construction joints, leading to persistent dampness, water ingress and flooding if suitable protection is not installed.

Waterproofing becomes particularly important when planning a basement conversion, to ensure your basement can safely be used as:

  • Additional living or guest accommodation
  • A home office/workspace
  • A gym or entertainment room
  • A utility room
  • Storage area containing valuable possessions

A professionally designed waterproofing system helps protect both the structure and its contents whilst creating a comfortable, dry internal environment.

What Causes Water Ingress in Basements?

Due to being underground, basements are much more susceptible to water ingress compared to external structures, and can occur for a variety of reasons and may affect both older and modern buildings.

Common causes include:

  • Groundwater pressure against below-ground walls
  • Cracks within masonry or concrete structures
  • Poor drainage around the building
  • Failed construction joints
  • High external ground levels
  • Flooding & severe weather conditions

The root cause of moisture ingress should always be identified through a damp & waterproofing survey before remedial works are specified. This ensures the most appropriate waterproofing solution is installed.

Biocraft South West’s team of expert CSRT and CSSW certified surveyors take great care to inspect every aspect of your underground structures, meaning we can provide safe, long-lasting solutions that avoid costly future repair.

We provide professional damp surveys and waterproofing solutions across Wiltshire, Somerset, Gloucestershire and Oxfordshire, including Bath, Bristol, Swindon and surrounding areas.

Contact Us

What types of Basement Waterproofing are available?

Several waterproofing methods are available depending on the construction, condition and intended use of the structure.

Cavity Drain Membrane Systems

Cavity drain membrane systems are one of the most widely used waterproofing methods for basement conversions and existing below-ground structures.

These systems work by allowing water entering through the structure to pass behind a specialist membrane into a controlled drainage system. The water is then safely directed towards drainage channels and sump pump systems for removal.

Benefits of cavity drain membrane systems include:

  • Minimal preparation of existing surfaces
  • Effective management of groundwater ingress
  • Reduced disruption during installation
  • Excellent performance in structures subject to movement
  • Suitable for both new and existing basements

Cementitious Waterproofing

Cementitious waterproofing is a waterproof coating system applied directly to masonry or concrete surfaces to prevent moisture and water penetration. It creates a durable barrier that helps protect below-ground structures from dampness and water ingress.

Benefits of cementitious waterproofing include:

  • Applies a waterproof barrier directly to walls and floors
  • Bonds to concrete and masonry substrates
  • Durable and long-lasting with minimal maintenance requirements
  • Suitable for irregular surfaces and complex structural details

Combined Waterproofing Approaches

In many situations, the most effective solution involves combining multiple waterproofing methods to achieve the required level of protection.

At Biocraft South West, our surveyors assess each property individually to determine the most appropriate waterproofing solution.

Basement Flooding, Drying & Post-Flood Waterproofing

Flooding can cause significant damage to basements, cellars and other below-ground structures. Even after standing water has been removed, moisture can remain trapped within walls, floors and building materials, leading to ongoing dampness, mould growth, decorative damage and deterioration of structural elements if left untreated.

Alongside standard basement waterproofing, Biocraft South West provides basement drying and post-flood waterproofing, ensuring your property is protected from the effects of water ingress.

Professional Structural Drying

Following a flood event, it is essential that affected areas are thoroughly assessed and dried before repair or refurbishment works begin. Our specialists can investigate moisture levels within the structure, identify water penetration pathways and assess the effectiveness of any existing waterproofing systems to ensure hidden moisture is properly addressed.

Preventing Future Flood Damage

Where flooding has occurred, improvements to waterproofing and drainage systems can help reduce the risk of future water ingress. Solutions such as cavity drain membranes, drainage channels, sump pump systems and waterproof wall and floor treatments can all form part of a long-term waterproofing strategy designed to protect below-ground spaces.

Why Choose Biocraft South West?

We’re basement and cellar waterproofing specialists.

Basement waterproofing requires specialist knowledge of below-ground structures, groundwater behaviour and moisture management.

No two basements are exactly the same. Factors such as construction type, ground conditions, existing defects and intended use all influence the most appropriate waterproofing approach.

Our experienced CSRT and CSSW-certified engineers assess each project and recommend solutions that provide effective, long-term performance rather than a one-size-fits-all treatment.

We support your home expansion through curated basement conversions.

Whether you’re creating additional living space, a home office, gym or entertainment room, waterproofing forms the foundation of every successful basement conversion.

We work closely with property owners to ensure below-ground spaces remain dry, comfortable and suitable for their intended use both now and in the future.

Long-term protection for your property.

By addressing moisture issues correctly and installing appropriate waterproofing solutions, we protect the condition, usability and value of your property for years to come.

Want to find out what our customers think? Visit our testimonials page. 

Contact our Damp Proofing Experts









    Basement Waterproofing

    Basement & Cellar Waterproofing Specialists in the South West

    At Biocraft South West, we specialise in basement and cellar waterproofing, helping protect properties from damp and water ingress.
    Using specialist techniques, such as sump/pump and cavity drain membrane systems, alongside quality waterproofing products, we provide a variety of solutions for new and existing basements, cellars and below-ground areas.

    Basement conversions are increasingly popular, creating valuable space for kitchens, offices, gyms, utility rooms, living areas and bedrooms. Ensuring these spaces remain dry and protected from water ingress is essential.

    With extensive experience in basement waterproofing, our team can recommend effective solutions to help manage damp, moisture and running water.

    Contact our friendly team today to discuss your basement or cellar waterproofing requirements

    A dry & moisture protected basement is vital to any basement conversion. Contact our specialists CSSW engineers today to discuss waterproofing treatment today.

    Contact Us

    Why Do Basements Need Waterproofing?

    Unlike above-ground rooms, basements and cellars are constantly exposed to moisture from the surrounding ground.

    Groundwater and water under pressure can penetrate walls, floors and construction joints, leading to persistent dampness, water ingress and flooding if suitable protection is not installed.

    Waterproofing becomes particularly important when planning a basement conversion, to ensure your basement can safely be used as:

    • Additional living or guest accommodation
    • A home office/workspace
    • A gym or entertainment room
    • A utility room
    • Storage area containing valuable possessions

    A professionally designed waterproofing system helps protect both the structure and its contents whilst creating a comfortable, dry internal environment.

    What Causes Water Ingress in Basements?

    Due to being underground, basements are much more susceptible to water ingress compared to external structures, and can occur for a variety of reasons and may affect both older and modern buildings.

    Common causes include:

    • Groundwater pressure against below-ground walls
    • Cracks within masonry or concrete structures
    • Poor drainage around the building
    • Failed construction joints
    • High external ground levels
    • Flooding & severe weather conditions

    The root cause of moisture ingress should always be identified through a damp & waterproofing survey before remedial works are specified. This ensures the most appropriate waterproofing solution is installed.

    Biocraft South West’s team of expert CSRT and CSSW certified surveyors take great care to inspect every aspect of your underground structures, meaning we can provide safe, long-lasting solutions that avoid costly future repair.

    We provide professional damp surveys and waterproofing solutions across Wiltshire, Somerset, Gloucestershire and Oxfordshire, including Bath, Bristol, Swindon and surrounding areas.

    Contact Us

    What types of Basement Waterproofing are available?

    Several waterproofing methods are available depending on the construction, condition and intended use of the structure.

    Cavity Drain Membrane Systems

    Cavity drain membrane systems are one of the most widely used waterproofing methods for basement conversions and existing below-ground structures.

    These systems work by allowing water entering through the structure to pass behind a specialist membrane into a controlled drainage system. The water is then safely directed towards drainage channels and sump pump systems for removal.

    Benefits of cavity drain membrane systems include:

    • Minimal preparation of existing surfaces
    • Effective management of groundwater ingress
    • Reduced disruption during installation
    • Excellent performance in structures subject to movement
    • Suitable for both new and existing basements

    Cementitious Waterproofing

    Cementitious waterproofing is a waterproof coating system applied directly to masonry or concrete surfaces to prevent moisture and water penetration. It creates a durable barrier that helps protect below-ground structures from dampness and water ingress.

    Benefits of cementitious waterproofing include:

    • Applies a waterproof barrier directly to walls and floors
    • Bonds to concrete and masonry substrates
    • Durable and long-lasting with minimal maintenance requirements
    • Suitable for irregular surfaces and complex structural details

    Combined Waterproofing Approaches

    In many situations, the most effective solution involves combining multiple waterproofing methods to achieve the required level of protection.

    At Biocraft South West, our surveyors assess each property individually to determine the most appropriate waterproofing solution.

    Basement Flooding, Drying & Post-Flood Waterproofing

    Flooding can cause significant damage to basements, cellars and other below-ground structures. Even after standing water has been removed, moisture can remain trapped within walls, floors and building materials, leading to ongoing dampness, mould growth, decorative damage and deterioration of structural elements if left untreated.

    Alongside standard basement waterproofing, Biocraft South West provides basement drying and post-flood waterproofing, ensuring your property is protected from the effects of water ingress.

    Professional Structural Drying

    Following a flood event, it is essential that affected areas are thoroughly assessed and dried before repair or refurbishment works begin. Our specialists can investigate moisture levels within the structure, identify water penetration pathways and assess the effectiveness of any existing waterproofing systems to ensure hidden moisture is properly addressed.

    Preventing Future Flood Damage

    Where flooding has occurred, improvements to waterproofing and drainage systems can help reduce the risk of future water ingress. Solutions such as cavity drain membranes, drainage channels, sump pump systems and waterproof wall and floor treatments can all form part of a long-term waterproofing strategy designed to protect below-ground spaces.

    Why Choose Biocraft South West?

    We’re basement and cellar waterproofing specialists.

    Basement waterproofing requires specialist knowledge of below-ground structures, groundwater behaviour and moisture management.

    No two basements are exactly the same. Factors such as construction type, ground conditions, existing defects and intended use all influence the most appropriate waterproofing approach.

    Our experienced CSRT and CSSW-certified engineers assess each project and recommend solutions that provide effective, long-term performance rather than a one-size-fits-all treatment.

    We support your home expansion through curated basement conversions.

    Whether you’re creating additional living space, a home office, gym or entertainment room, waterproofing forms the foundation of every successful basement conversion.

    We work closely with property owners to ensure below-ground spaces remain dry, comfortable and suitable for their intended use both now and in the future.

    Long-term protection for your property.

    By addressing moisture issues correctly and installing appropriate waterproofing solutions, we protect the condition, usability and value of your property for years to come.

    Want to find out what our customers think? Visit our testimonials page. 

    Contact our Damp Proofing Experts