What is black mould and why is it so common in rented homes?


Following the death of two-year-old Awaab Ishak from a respiratory infection caused by toxic mould in his Rochdale home, Housing Minister Michael Gove has announced that every council and housing authority must provide details of how they plan to tackle damp and mould in their properties.

But what is mould and why is it so common in rental homes?

It’s a fungus rather like mildew or toadstools, and it needs permanently damp conditions to grow and multiply. 

Health risk: Mould is an allergen and, if allowed to spread, can become highly toxic and cause severe respiratory infections

Health risk: Mould is an allergen and, if allowed to spread, can become highly toxic and cause severe respiratory infections

It struggles to establish itself in dry conditions and, if you can see mould growing on a wall, you are looking at a colony of perhaps millions of mould spores.

Once they start growing, they increase rapidly and will continue to do so unless eradicated. 

Mould is an allergen and, if allowed to spread, can become highly toxic and cause severe respiratory infections. Spores can grow on plaster, wood, carpet and even dust.

The problem is worse in tenanted homes, rather than privately owned ones, as these properties tend to be cheaply built with thin walls and are prone to condensation. Also, much rental stock is old and not built to current housing regulations.

Another factor is that these properties tend to be less well looked after by landlords than owner-occupied homes. 

Indeed, according to the charity Shelter, around 40 per cent of rental homes are susceptible to mould.

As it happens, I know what I’m talking about, as new tenants in my London rental flat complained that there was black mould growing in the bathroom. 

I took swift action to remedy the problem and contacted Pure Maintenance UK, a specialist mould removal company.

Of course, I knew the flat — a 70-year-old ex-council property — was at risk of mould, but in the past either the tenants kept it down or it did not bother them.

I had provided a dehumidifier, but it could not cope with the new mould creeping down walls, blinds and even, according to my tenants, getting on their shoes. They said the mould was making them ill.

How to rid your home of mould 

  • Regularly open windows to air your rooms.
  • Buy a powerful humidifier.
  • Also buy a hygrometer, which measures humidity levels and costs only around £5.
  • After showering, wipe down the glass cubicle doors and tiles, because this will drastically impair the growth of mould.
  • Always keep your furniture a few inches away from external walls.
  • Dry the washing outside or in a tumble dryer. Never drape damp laundry over the radiators.
  • Never store damp clothes in your wardrobes.
  • Wipe windowsills with white vinegar from time to time.
  • Maintain a temperature of 18-22c within the property.
  • When cooking or having a shower, make sure that you turn on the extractor fan.

Effective mould removal is not a simple job, nor is it cheap: I was quoted £1,200 to clear three smallish rooms.

It is rather like removing asbestos, where hazmat suits have to be worn by operators and the property must be vacated while the treatment work is carried out.

The first task in my flat was to take moisture readings and thermal imaging to assess the type and extent of the mould. 

After that, the dew point — the level of condensation — was measured and found to be high. 

Once the surfaces had been cleaned, the final job was to apply Dry Fog, a disinfectant that creates an anti-microbial barrier, and eradicates mould and bacteria.

A few days later, I received a five-page report with about 100 photos attached, showing the affected surfaces before and after treatment, and was told that a technical lab report would follow.

This stated that although a ‘significant reduction’ had been achieved, the technicians wanted to come back to test the air quality and do more dry fogging if necessary.

At the same time, they sent a list of tips to prevent the mould returning.

Josh Unice, who co-founded Pure Maintenance, says: ‘About 15 years ago, new anti-microbial technology was invented in Utah in the U.S. by a friend of mine, and we decided to make use of this to eliminate mould in British homes. 

One reason we started the company was because my business partner, Sam Bowles, had serious health issues at university caused by mould.’

When tragic Awaab Ishak’s father, Faisal Abdullah, became aware of the worsening mould problem, he contacted Rochdale Boroughwide Housing, which owned the property, and was told to paint over it.

But, according to Unice, this is the very worst thing you can do, because it encourages the mould to grow.

The technology to combat mould in the home is now there and we must make use of it before there are any other tragedies, such as the death of a small child.

Best mortgages

What to do if you need a mortgage 

Borrowers who need to find a mortgage because their current fixed rate deal is coming to an end, or because they have agreed a house purchase, have been urged to act but not to panic, writes This is Money editor Simon Lambert.

Banks and building societies are still lending and mortgages are still on offer with applications being accepted. 

Rates are changing rapidly, however, and there is no guarantee that deals will last and not be replaced with mortgages charging higher rates. 

This is Money’s best mortgage rates calculator powered by L&C can show you deals that match your mortgage and property value

What if I need to remortgage? 

Borrowers should compare rates and speak to a mortgage broker and be prepared to act to secure a rate. 

Anyone with a fixed rate deal ending within the next six to nine months, should look into how much it would cost them to remortgage now – and consider locking into a new deal. 

Most mortgage deals allow fees to be added the loan and they are then only charged when it is taken out. By doing this, borrowers can secure a rate without paying expensive arrangement fees.

What if I am buying a home? 

Those with home purchases agreed should also aim to secure rates as soon as possible, so they know exactly what their monthly payments will be. 

Home buyers should beware overstretching themselves and be prepared for the possibility that house prices may fall from their current high levels, due to  higher mortgage rates limiting people’s borrowing ability.

How to compare mortgage costs 

The best way to compare mortgage costs and find the right deal for you is to speak to a good broker.

This is Money’s mortgage broker partner L&C told me that mortgages are still available and you can use our best mortgage rates calculator to show deals matching your home value, mortgage size, term and fixed rate needs.

Be aware that rates can change quickly, however, and so the advice is that if you need a mortgage to compare rates and then speak to a broker as soon as possible, so they can help you find the right mortgage for you.

> Check the best fixed rate mortgages you could apply for 


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