QDT is now managed by AG Damp Solutions. New Enquiries only.

0800 859 5938
Opening Hours Mon to Fri: 8am - 5pm
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The region's premier damp proofing specialists

Full range of damp proofing, rendering and timber preservation

One of London's most established & reliable companies

Damp Proofing Wet & Dry Rot Control Timber Preservation
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If you have damp in your property, ACT NOW!

Call us today on 0800 859 5938
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Damp Proofing

Quadrant Damp & Timber Treatments are leading specialists in damp proofing for both domestic and commercial customers throughout the North and West London areas, including Ealing and Hampstead. We understand the importance of working quickly when dealing with damp before the problem escalates into a larger, more costly issue, which is why we promise a fast response at a time convenient for you.

Not only can damp impact the look of your property, it can also lead to very expensive structural damage. Caring for properties for over 40 years, our expert surveyors and damp engineers can quickly identify and fix any damp problems, with minimal disruption to the rest of your premises.

The combination of our professional services and our insurance-backed guarantees will give you the peace of mind that you will receive quality service and customer care, for a service which is second to none.

For professional advice or to arrange a free, no obligation quote, don’t hesitate to get in touch today – our damp proofing office is open from 9am to 5pm Monday to Friday, with the option of Saturday appointments available after prior arrangement.

We used Quadrant for damp proofing the ground floor of our home. We found them to work diligently in getting the job done. All questions and concerns were addressed by the team. I wish to express a special "thank you" to Ellie, Paul and Rob. I can also say that both Rob and Paul cleaned up after the job and Ellie always provided a polite, professional and proficient service. I recommend Quadrant to anyone looking for damp treatment. Thank youread more
Manbir Leefield
Manbir Leefield
11:56 22 Feb 18
Very helpful, a professional report was done, the guy who came to see my property was on time and polite. He sent me a very detailed report explaining that the problem was condensation not damp, and how we can prevent this in the future. I contacted many other companies, some wanted to charge me for a survey, some didn't turn up and one was rude to me down the phone. I can't stress enough how pleased i was with this company's attitude, I would recommend them to anyone.read more
Paul Clark
Paul Clark
14:19 23 Nov 16

We specialise in:

  • Damp Proofing
  • Woodworm
  • Damp Surveys
  • Basement Waterproofing
  • Rising Damp
  • Roof tiling
  • Emergency Roofing
  • Chimney Repairs
  • Structural Waterproofing (including basement conversions)
  • Wet and Dry Rot
  • Commercial Damp Proofing
  • Concrete Repairs and Treatment
  • Roofing Repairs & maintenance
  • Guttering & Roof Drains
  • Fascias & Sofits
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  • Amersham
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  • Denham
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  • Wendover


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  • Tring
  • Watford
  • Welwyn


  • Brentford
  • Cockfosters
  • Eastcote
  • Edgware
  • Enfield
  • Greenford
  • Harefield
  • Harrow
  • Hillingdon
  • Hayes
  • Hounslow
  • Ickenham
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  • Acton
  • Barnet
  • Camden
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  • Chiswick
  • Colindale
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