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Are your windows dripping wet and your walls damp and mouldy? Then you have condensation, and you need to act quickly before it causes damage to your home or even your health.
At Environ, we’ve driven damp out of thousands of London homes and – most importantly – we’ve kept it out. We don’t just treat the symptoms; we investigate and eradicate the causes so that you don’t have to keep fighting a losing battle against condensation.

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What are the risks of condensation?

Water sitting on your walls, windows or windowsills creates the perfect environment for rot and mould to spread. If left untreated, your plaster, wallpaper, windowsills or window and door frames could become so damaged that they need to be stripped out and replaced.
Even worse are the implications for your health. The NHS warns about the impact of damp and mould on your health, which increases your risk of “respiratory problems, respiratory infections, allergies or asthma.”

What causes condensation?

Condensation happens when air with a lot of moisture meets a cold surface, which cools the water molecules, causing them to solidify into water.
The problem is most of this excess moisture is caused by day-to-day life. Cooking, boiling the kettle, having a shower, drying clothes and even just breathing releases moisture into the air. No one’s going to cut out these necessities, so the only real solution is to increase ventilation, reduce the amount of moisture or warm up cool surfaces.
Because more people are sharing homes in London and people are too security-minded to leave their windows open, condensation is an increasing problem, putting more and more people and properties in danger.

It’s important to bear in mind that condensation is sometimes caused by more serious damp problems such as penetrating, lateral or rising damp. Always have a professional damp survey carried out by a reputable firm so that they can rule out any structural issues that could be allowing moisture to get into your home.

How can you treat condensation?

The best course of action for eliminating condensation depends on the cause, which could be any combination of the following:

Poor ventilation. The solution may be as simple as opening windows more in the building, but if that still doesn’t create enough airflow or isn’t feasible for security reasons, then you’ll want to have simple trickle vents installed or more advanced PIV units, which promote air flow and temperature to further reduce condensation.

Too much moisture. This likely means you have another damp problem, such as rising damp, lateral damp or penetrating damp. Read our damp causes guides for each to learn more, as treatments can range from quick and easy jobs such as fixing a leaky gutter, to time consuming and invasive procedures like replacing plumbing or installing a damp proof course.

Cold surfaces. There are many reasons that a wall or window may be too cold, such as structural defects like cold bridges or cracks, or a lack of insulation in walls or single-glazed glass. If the cause isn’t obvious, heat maps can narrow down the location of the cold, helping us to find the most efficient and cost-effective solution.


A professional full mould removal and chemical clean would be advised to eliminate the existing mould in the property, followed by installing the Vent Axia PIV unit which runs efficiently to circulate clean, dry air around the property and prevent mould/ condensation build up.

The aim of the PIV unit is to install a permanent and cost-effective solution to mould/condensation issues to ensure that you will not have to continue paying for temporary fixes and rather solve the problem at the source. 

Please note that a mould clean will not guarantee that the mould will stay away permanently. The mould clean should be regarded as a great temporary solution to mould/condensation build-up, but if you are looking for a permanent solution, we always strongly recommend installing a PIV (along with the mould clean) to ensure your property remains mould and condensation free. 

DAMP Quote.
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I wanted to take a minute and thank you all for resolving the damp issue we had. Its so nice to come home and not see or smell the disaster that was there before. Just in time for Christmas which I would have to say you guys saved as we have family coming who had their flights already booked. A massive relief Thank you so much!! Would definitely recommend your team from initial contact to works completed. Great job.
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I chose to use Environ to deal with a damp wall, the whole process from beginning to end has been straightforward, well explained and they've managed to strike a pleasing balance between friendliness and professionalism. Everyone they sent over during the course of the work, as well as their office staff has been, nice helpful and accommodating. I hope not to need to use them again but if I do, I'll do so gladly!
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Came round to have a look at work required and actually realised it was all low level work. Explained and showed what was required. They can back about a week later (or thereabouts) to carry out the work which was done very quickly (about an hour if I recall). Because it took less time than was originally thought have not been charged for the materials so was very happy about that.

Ryan R.


Kristian F.


Jacqueline M.