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Date updated: 27/01/2023

The City of London Housing Service take reports of damp and mould very seriously. If you spot signs of damp and mould in your home, please report it to us immediately.

There are lots of reasons that damp and mould can occur in homes. To make sure every case is properly investigated, our Property Services Officers will visit and assess your home. During the visit they will identify the causes of the mould and advise on any repairs needed. Should a repair be advised, the timeframe and duration of the repair will depend on the severity of the issue.

The Property Services Officer may also give you advice on your heating controls to help them perform better and work with you to help make changes that will prevent mould in the future.

For examples of what to look out for, and what damp and mould may look like scroll to the bottom of the webpage.

Condensation is when moisture or water in the air collects on a cooler surface. Most people have a little bit of condensation, like the droplets you see on your windows after a shower. While it’s usually nothing to worry about, condensation can lead to damp and mould if left for too long.

Mould looks like little black dots in the corners of the windows or anywhere water collects. Mould can be bad for your health, so it's important you take action if you spot signs of mould in your home.

Damp looks like a wet patch on a wall or ceiling and appears when condensation is left for a long time. Left untreated, damp can cause structural problems over a long period of time.

There are lots of reasons why damp and mould can happen in homes. These can range from there being too much moisture in the air to plumbing and ventilation faults, or more deep-seated problems with a building.

You should always report damp and mould in your home as soon as possible.

Damp and mould can be caused by lots of things. However, there are some simple steps that you can take to help avoid this problem appearing in your home.

Remove moisture in your home when you can

A common cause of mould is condensation or moisture on surfaces in your home. This is most common in areas such as kitchens and bathrooms. To avoid this, wipe condensation or water droplets from walls, tiles, shower screens and windows. If you discover a leak or damp patch in your home, please report this to us as soon as possible.

Keep your home properly ventilated

Try and open your windows regularly to let out moist air and let fresh air in and use any extractor fans you may have. To stop moisture from spreading when you are cooking or bathing, keep the doors to the bathroom and kitchen closed.

Stop rooms from getting too cold

Very cold rooms can provide ideal conditions for mould to grow, so it’s recommended you don’t let the temperature in your home fall below 14 °C (the ideal temperature for your living room is 20°C, for the bathroom it’s 23°C and for the bedroom and kitchen it’s 16°C).

Try not to dry clothes on radiators

Drying clothes on radiators increases the moisture that they release and can create damp stops in your home. Instead, try and hang them on a clothes airer - place this in a well-ventilated room with any doors to the rest of your home closed.

Avoid placing furniture close to walls

Mould can grow in spaces where air can’t circulate, so avoid leaning large items of furniture or storing lots of items against walls, with no space for air to move.

We encourage our tenants to let us know of any issues with condensation/damp/mould as soon as possible and, these are given a high priority.

  • If we can identify the root cause (for example, a leak) easily over the phone, we’ll arrange a repair
  • Wherever possible, we will inspect within five working days (subject to access) to identify the possible causes and associated remedial works
  • If further work is required, the timeframe and duration of the repair will depend on the severity of the issue and agreed with the customer
  • Remedial works will be completed within seven working days of an order being placed.
  • We will also discuss the matter with our tenants, providing advice and guidance as appropriate
  • Completed works will be post-inspected by our Property Services Officers

Please report any damp and mould in your City of London managed property to the repairs team straight away so that we can help.

We encourage our tenants to let us know of any issues with condensation/damp/mould as soon as possible – they will be given a high priority.

Online form

Report damp and mould in your home


Property Services team


0800 035 0003 - 24 hours, seven days a week.

All faults can be reported between 8am - 5pm.

Out of hours emergency repairs can only be reported between 5pm - 8am.

For gas repair, please press option two and you will be passed onto TSG Building Services.

Preventing damp and mould in your home leaflet PDF (900KB)
Date submitted: 25/01/23
Condensation Booklet PDF (650KB)
Date submitted: 20/01/23
damp and condensation on a window
Example 1: Damp and mould on a window pane
damp and mould in the corner of a room
Example 2: Damp and mould forming in the corner of a room
water seeping into walls by a window
Example 3: Water penetration causing damp and water marks on a wall
rising damp causing paint to flake off of wall
Example 4: Rising damp on an exterior wall causing paint to flake off and become raised