About Duncan Ridley, and how we work

Simply Filtered is an independent mould and condensation assessment service covering London inside the M25. Its founder, Duncan Ridley, carries out every mould survey, antimicrobial fogging visit and window film survey himself and writes every report.

If you've cleaned, repainted or treated the same mould in your home more than once, the problem is the cause, not the mould. Your survey measures what's happening, finds that cause and sets out what it will take to deal with it. In Duncan's experience, that's usually better ventilation, not major building work.

Building, repair and ventilation installation aren't part of the service, so there's nothing to sell you beyond the survey. If your plan needs work, you can use your own contractor or ask for an introduction to a trusted third party, with no obligation either way.

If you think you've got a leak or rising damp, you need a specialist, not a mould survey. We'll tell you who to call.