structural waterproofing
protect your property with structual waterproofing
Structural Waterproofing Services in Bath, Bristol & the South West
Structural waterproofing is essential for protecting below‑ground structures from water ingress, damp, and long‑term deterioration. Cannon Clarke provides specialist waterproofing solutions designed to meet BS 8102:2022, ensuring your basement, cellar, retaining wall or below‑ground extension remains dry, safe and structurally sound.
What Structural Waterproofing Protects Against
Below‑ground structures are exposed to constant moisture and hydrostatic pressure.
Without proper protection, this leads to:
- Persistent damp patches
- Mould growth and poor air quality
- Structural weakening over time
- Damage to finishes, flooring and stored items
- Increased long‑term repair costs
- Water ingress during heavy rainfall
Our Waterproofing Process
We follow a clear, compliant and proven methodology:
- Detailed Assessment & Diagnosis
A thorough inspection of the structure, moisture pathways, drainage conditions and existing defects.
- System Design
A tailored waterproofing strategy based on construction type, usage, risk level and BS 8102 requirements.
- Professional Installation
High‑performance membranes, drainage systems or cementitious coatings installed by trained specialists.
- Quality Assurance
Every installation is checked against BS 8102 and manufacturer specifications to ensure long‑term performance.
- Aftercare & Support
Clear guidance on maintenance, ventilation and ongoing protection.
Waterproofing Systems We Install
Cavity Drainage Membrane Systems (Type C)
A reliable, maintainable system that manages water ingress and directs it safely to drainage or a sump pump.
Cementitious Waterproofing (Type A)
Applied directly to the structure to resist moisture penetration and hydrostatic pressure.
Combined Systems
For high‑risk environments, we design and install combined Type A + Type C systems for maximum protection.
Pricing Guidance
Structural waterproofing costs vary depending on:
- Size of the area
- Type of waterproofing system
- Access and complexity
- Condition of existing surfaces
- Required compliance level
Typical ranges:
- Small basements: £10,000-£15,000
- Medium spaces: £10,000 – £20,000
- Full conversions: £15,000 +
We provide clear, itemised quotations with no hidden costs.
Trusted Across Bath, Bristol & the South West
Cannon Clarke delivers domestic and commercial structural waterproofing across:
- Bath — heritage properties, basement conversions, retaining walls
- Bristol — modern developments, commercial units, residential refurbishments
- Somerset & Wiltshire — rural properties, cellars, below‑ground extensions
Trusted by:
- Surveyors
- Insurers
- Property managers
- Homeowners across the South West
Our reputation is built on technical accuracy, reliability and long‑term results.
Case Study Snapshots
Bath — Basement Conversion
Installed a full cavity drainage system with sump and pump, resolving long‑term damp issues and enabling a habitable living space.
Bristol — Commercial Unit
Applied cementitious waterproofing to retaining walls experiencing hydrostatic pressure, preventing water ingress during peak rainfall.
Somerset — Heritage Property
Designed a non‑intrusive waterproofing solution compatible with historic masonry and conservation requirements.
Compliance & Standards
Our waterproofing systems meet:
- BS 8102:2022 — Code of practice for protection of below‑ground structures where applicable
- Manufacturer installation standards
- Insurance‑backed guarantee requirements
All work is carried out by our employed trained specialists with extensive experience in below‑ground protection.
FAQs
What causes basement leaks?
Basement leaks are typically caused by hydrostatic pressure, poor drainage, failed membranes or structural cracks.
Do you follow BS 8102?
Yes. Where Applicable all waterproofing systems are designed and installed in accordance with BS 8102:2022.
Can waterproofing be added to existing basements?
Absolutely. We regularly retrofit waterproofing systems to older properties and heritage buildings.
How long does installation take?
Most projects take between 5–10 days depending on size and complexity. (larger projects will take longer.
Do you offer guarantees?
Yes. We provide manufacturer-backed and insurance-backed guarantees where applicable.
More information?
For reliable structural waterproofing, call Cannon Clarke or book a professional survey. We’ll assess your property, explain your options and provide a clear, compliant plan.
Our Process
Survey
We start by conducting a thorough survey of the space you want inspected. There's usually a fee for our initial consultation.
01
Scoping discussion
We collaborate with you to marry your objectives with our findings from the survey. We’ll discuss how you want to use the space when it’s finished and the best way of achieving your vision.
02
Design
Once we have the physical specifications, and your input on your requirements, we’ll design a system that works for you.
03
Approval
We’ll send you a specification, together with a report which explains the technical aspects. We’re happy to chat through this with you and make any changes you’ve identified.
04
Work begins
With an approved plan in place, we’ll get to work on the date we’ve agreed between us.
05