For landlords and letting agents
Mould surveys for landlords and letting agents
Get an independent answer when your tenant reports mould, and a proportionate plan you can keep on file.
Before you pay for any work, you need to know whether the mould comes from the building, how the flat is used, or both. Duncan measures it, finds the cause and writes down what's proportionate to do.
What you get
- Readings in every room your tenant reported
- The cause: the building, how it's used, or both
- A proportionate plan, usually ventilation
- A written report to keep on file
Independent: no obligation to use anyone we recommend.
Book your mould surveyIn short
Simply Filtered carries out independent mould surveys for private landlords and letting agents across London inside the M25. Duncan Ridley measures relative humidity, dew point and surface temperatures in the rooms a tenant has reported, and writes up what's causing the mould and what's proportionate to do about it, in a report the landlord can keep on file and share with the tenant.
Sound familiar?
Your tenant has reported mould, and you're not sure what's behind it.
- “My tenant keeps sending me photos of mould.”
- “Is it the flat, or is it how they're living in it?”
- “One contractor says rising damp and another says condensation.”
- “I need something on file showing I've dealt with it properly.”
A survey gives you measurements instead of guesswork. You find out what's causing the mould, you pay only for work that deals with that cause, and you have a written record of how you responded.
How a mould survey worksWhat you get
A clear answer you can act on, and a record you can keep.
- Readings, not opinions
- Relative humidity (how much moisture the air is holding), dew point (the temperature at which that moisture turns to water) and surface temperatures, in each room you're worried about.
- The readings show where the moisture comes from and where it settles, so the report deals in evidence, not blame.
- The cause
- Whether it's the building, how the rooms are used, or a mix of the two.
- You only pay for work that deals with the real cause, instead of treating the symptom and getting the call again next winter.
- A proportionate plan
- Most often better ventilation. Sometimes insulating one specific cold area.
- In our experience, most mould problems don't need major work. They need the right fix in the right place.
- A written record
- Your readings, photographs, the cause and the recommendations, in one report.
- You can keep it on file as part of how you responded, and share it with your tenant so you're both working from the same facts.
Your legal duties
Does Awaab's Law apply to private landlords?
Not yet. You already have legal duties around damp and mould, and Awaab's Law is expected to be extended to private rentals.
The Renters' Rights Act 2025 allows Awaab's Law to be applied to private rentals in a later phase, and no date has been confirmed. Read the GOV.UK guide to the Renters' Rights Act for the current position, and GOV.UK's guidance on damp and mould in rented homes for what's expected of you now.
A survey report won't settle any legal question for you, but it does give you a measured, documented response to your tenant's report.
When you need someone else
If it isn't mould from condensation, we'll tell you.
Some reports turn out to be something else: a leak, possible rising damp, or a structural problem. We don't diagnose rising damp or find leaks, so if the readings point that way, the report says so and tells you which specialist to call, with the evidence to hand them.
What happens next
From your enquiry to your report.
Send the form
Tell us what's going on. It takes about 2 minutes.
Get your free quote
You get your exact price and what's included. If you're happy to go ahead, we agree a time that suits you.
The visit
Duncan visits at a time agreed with you or your tenant, looks at the mould and takes the readings.
Your report
The cause and a proportionate plan, in writing, to keep on file. No obligation to use anyone we recommend.
Questions
Questions from landlords and agents.
Is it just my tenant's lifestyle?
Sometimes how a room is used plays a part, sometimes it's the building, and often it's both. The readings show which, and the report sets out what to change on each side, so you aren't relying on anyone's word.
How much does a mould survey cost?
A mould survey includes the visit and your written report. The price depends on your home. Send the form for a free quote, with the exact price and what's included, before anything is booked.
Can I share the report with my tenant?
Yes. It's your report to share with your tenant, your letting agent or anyone else involved. It's written in plain English, so everyone can follow what was measured and what it means.
Will you try to sell me building work?
No. We don't do building, repair or ventilation work, so there's nothing to sell. If your plan needs work, you're free to use any contractor you choose.
One contractor says rising damp. Can you confirm it?
We don't diagnose rising damp. The survey measures where the moisture is and why it's condensing there. If the readings suggest rising damp, the report says so and points you to a damp surveyor.
Next step
Find out what's behind your tenant's mould.
Tell us about the property and what your tenant has reported, and you get an exact price back. You're under no obligation to use anyone we recommend.
WhatsApp usOr call 07366 199261