Advanced Tanking Systems & Damp Protection
Basement & Cellar Waterproofing
What is Basement Waterproofing?
Basement and cellar waterproofing involves creating a comprehensive moisture barrier to protect below-ground spaces from groundwater ingress and hydrostatic pressure. This specialised treatment transforms damp, unusable cellars into dry, functional living spaces suitable for conversion. Professional waterproofing systems include tanking (applying waterproof membranes and coatings), cavity drain membranes that channel water away, and sump pump installations to manage groundwater. These advanced solutions provide complete protection against water infiltration, making your basement suitable for storage, living space, or commercial use while adding value to your property.
Signs You Need Waterproofing
- Standing water or puddles appearing in your basement or cellar
- Damp patches, staining, or efflorescence on basement walls and floors
- Musty, damp odours indicating persistent moisture problems
- Water seepage through walls or floor during heavy rainfall
- High humidity levels making the space unsuitable for use or storage
- Visible mould or mildew growth on walls, floors, or stored items
- Cold, wet walls indicating groundwater pressure against the structure
Common Causes
- High water table or groundwater levels around property foundations
- Hydrostatic pressure forcing water through basement walls and floors
- Absence of or inadequate existing waterproofing systems
- Defective or deteriorated original tanking from age or poor installation
- Poor drainage around the property directing water towards foundations
- Lateral penetrating damp from soil in contact with walls below DPC
- Cracked or porous basement walls allowing water infiltration
- Desire to convert cellar into habitable living or storage space
Our Waterproofing Solutions
At MJ Harwood, we provide comprehensive basement and cellar waterproofing using industry-leading tanking systems and materials. Our solutions are designed to withstand hydrostatic pressure and provide long-term protection, backed by extended guarantees.
Our Process
Thorough basement survey to assess moisture levels, structure, and requirements
Preparation of walls and floors including removal of existing damaged materials
Installation of cavity drain membrane systems to channel water away from living space
Application of multiple coats of cementitious waterproof slurry and bonding agents
Creation of complete tanking system to seal against groundwater penetration
Sump pump installation where required to manage collected groundwater
Installation of new drainage systems to prevent future water accumulation
Final finishing suitable for conversion or immediate use of the space
Why Choose MJ Harwood?
- Advanced tanking systems using premium waterproofing materials
- Comprehensive solutions including cavity drain membranes and sump pumps
- Long-term guarantees available on waterproofing installations
- Professional cellar conversions transforming unusable space into valuable living areas
- Complete project management from initial survey to final conversion
- Transparent pricing with detailed quotations and no hidden costs
- Age UK registered and Care & Repair Leeds approved contractor
Trusted by homeowners across Yorkshire
Francheskah
“Quick response to potential damp found. Luckily no damp but advised on damp proofing home which we went ahead with and installed vents to existing windows. Reliable and prompt and honest fast worker. Definitely would recommend.”
MyBuilder User
Harrogate
“Damp proof completed and plastered as promised. Very pleased.”
Adam
Leeds
“Lee was fantastic as per expectations and reviews. Immediately was responsive and got the job done in no time. Now let's hope I don't have any more damp 🤞🏻”
Linda
Leeds
“Following an initial home visit I received a comprehensive estimate. A date was agreed, the team arrived and the job was done, with minimal disruption to me. All that gives me confidence that I can trust this company and would recommend them.”
MyBuilder User
Batley
“Very professional work. Waiting to see if damp course will work. Would recommend to others.”
Muhammed
Heckmondwike
“I had air vents installed in my windows and a special wall treatment to address mold issues, and I'm extremely pleased with the results. The team was professional, explained everything clearly, and worked efficiently. Highly recommend!”
Andy
Leeds
“A great job and went the extra mile. Lee sorted out a problem at my house while I was abroad and decorated after. He even colour matched the paint correctly. Really happy with his service. I would definitely recommend.”
Francheskah
“Quick response to potential damp found. Luckily no damp but advised on damp proofing home which we went ahead with and installed vents to existing windows. Reliable and prompt and honest fast worker. Definitely would recommend.”
MyBuilder User
Harrogate
“Damp proof completed and plastered as promised. Very pleased.”
Adam
Leeds
“Lee was fantastic as per expectations and reviews. Immediately was responsive and got the job done in no time. Now let's hope I don't have any more damp 🤞🏻”
Linda
Leeds
“Following an initial home visit I received a comprehensive estimate. A date was agreed, the team arrived and the job was done, with minimal disruption to me. All that gives me confidence that I can trust this company and would recommend them.”
MyBuilder User
Batley
“Very professional work. Waiting to see if damp course will work. Would recommend to others.”
Muhammed
Heckmondwike
“I had air vents installed in my windows and a special wall treatment to address mold issues, and I'm extremely pleased with the results. The team was professional, explained everything clearly, and worked efficiently. Highly recommend!”
Andy
Leeds
“A great job and went the extra mile. Lee sorted out a problem at my house while I was abroad and decorated after. He even colour matched the paint correctly. Really happy with his service. I would definitely recommend.”
Francheskah
“Quick response to potential damp found. Luckily no damp but advised on damp proofing home which we went ahead with and installed vents to existing windows. Reliable and prompt and honest fast worker. Definitely would recommend.”
MyBuilder User
Harrogate
“Damp proof completed and plastered as promised. Very pleased.”
Adam
Leeds
“Lee was fantastic as per expectations and reviews. Immediately was responsive and got the job done in no time. Now let's hope I don't have any more damp 🤞🏻”
Linda
Leeds
“Following an initial home visit I received a comprehensive estimate. A date was agreed, the team arrived and the job was done, with minimal disruption to me. All that gives me confidence that I can trust this company and would recommend them.”
MyBuilder User
Batley
“Very professional work. Waiting to see if damp course will work. Would recommend to others.”
Muhammed
Heckmondwike
“I had air vents installed in my windows and a special wall treatment to address mold issues, and I'm extremely pleased with the results. The team was professional, explained everything clearly, and worked efficiently. Highly recommend!”
Andy
Leeds
“A great job and went the extra mile. Lee sorted out a problem at my house while I was abroad and decorated after. He even colour matched the paint correctly. Really happy with his service. I would definitely recommend.”
About Us
Years of Experience Protecting Homes & Businesses
MJ Harwood is an independent damp proofing specialist and plastering contractor serving Leeds & West Yorkshire. We pride ourselves on offering a quality, affordable service to a wide range of clients, from homeowners to businesses and landlords. With years of experience in the industry, we bring expert knowledge and proven solutions to every project.
Our Commitment to You
- Quality affordable service across residential and commercial properties
- Years of hands-on experience in damp proofing and plastering
- Excellent friendly service with clear communication throughout
- Quality workmanship guaranteed on every project
- Fully approved by Age UK and Care & Repair Leeds
Frequently Asked Questions
Everything you need to know about our damp proofing services
How long does damp treatment take?
Most damp treatments are completed within 1-3 days depending on the severity and size of the affected area. We'll provide a clear timeline during your free survey.
Do you offer free surveys?
Yes, we provide completely free, no-obligation surveys. Our expert will assess your property, identify the cause, and provide a transparent fixed quote.
What guarantees do you offer?
We guarantee quality workmanship on every project. Our treatments use industry-leading materials and methods to ensure long-lasting protection for your property.
Do you work with landlords?
Absolutely. We work with homeowners, businesses, and landlords across Leeds & West Yorkshire. We're experienced in handling rental properties with minimal disruption to tenants.
What areas do you cover?
We cover Leeds and the wider West Yorkshire area. Contact us to confirm if we serve your location - we're happy to travel for the right project.
How quickly can you start?
We aim to respond to all enquiries within 24 hours and can often schedule surveys within a few days. Urgent cases are prioritised to prevent further damage.
Still have questions?
Can't find the answer you're looking for? Get in touch with our friendly team for a free consultation.