Mould doesn't take the summer off, now is the best time to get ahead

When the sun is out and windows are open, mould can easily slip down the priority list. For many landlords, the visible signs may reduce during the warmer months and tenants may report fewer immediate concerns. 

But that does not always mean the problem has gone away. 

For properties with a known history of damp, condensation or recurring mould, summer should not be seen as a quiet period. It should be seen as the ideal opportunity to review, plan and act before colder, wetter conditions return. 

Most landlords will know the homes in their portfolio that tend to be more vulnerable. It may be a property where mould returns every winter, a bathroom with ongoing condensation issues, or a building where previous treatments have only provided short-term relief. 

The mistake is waiting until the issue becomes visible again. 

By that stage, tenants may already be worried, the property may require urgent attention and the landlord is once again responding under pressure. A more proactive approach is to use the summer months to identify known risk properties, review previous reports, speak with tenants and put practical measures in place before conditions become perfect for mould to return. 

This is especially important for private landlords, who often manage smaller portfolios and may not have the same internal teams or resources as larger housing providers. A recurring mould issue can quickly become: time-consuming, costly and stressful, particularly when the same property needs repeated visits, cleaning, inspections or remedial works. 

The goal should not simply be to react when mould reappears. The goal should be to reduce the chance of repeat issues and give yourself more control over how the property is managed. 

At ArcAirTech, this is where we believe landlords can benefit from taking a more structured approach to indoor environmental management. That does not mean ignoring the root cause. Damp, leaks, building defects and property conditions all still need to be considered properly. But while those areas are being assessed or improved, landlords also need practical tools that help manage mould spores, improve indoor air quality and reduce the likelihood of recurrence. 

This is the approach we are seeing adopted across the housing sector: The Portable ARC used as rapid response where there is an immediate concern, and The Fixed ARC for longer-term prevention where a property has a history of persistent issues. 

Clarion Housing described this type of approach as a “highly effective and practical solution in tackling persistent mould issues”, noting a “marked reduction in recurrence” even in properties where mould had been a long-standing problem. 

Taff Housing made a similar point, stating that addressing mould “isn’t just about reacting” but about “continually evolving how we protect our homes and the people who live in them.” 

For private landlords, that message is important. If you already know a property has a recurring issue, the summer months are the time to get ahead of it. Waiting until October, November or December usually means waiting until the problem is already active again. 

Yorkshire Housing summed this up well in their own approach, explaining that the focus should not simply be to react to reported issues, but to “proactively prevent them” while safeguarding both properties and residents. 

That mindset is just as relevant to private landlords as it is to larger housing providers. A practical summer mould review could include: 

• Looking back at any properties with previous mould complaints or repeat callouts 

• Checking whether the same rooms or surfaces are affected each year 

• Speaking with tenants before problems return 

• Planning any repairs, upgrades or preventative measures early 

• Considering rapid-response support for properties at higher risk 

• Putting a clear process in place for how mould reports will be handled over winter 

The key is to not tale take summer off. For properties with a history of mould, it is often the best time to act calmly, strategically and cost-effectively. 

As Cannock Chase Council put it, managing mould “isn’t just about reacting — it’s about continually improving how we proactively protect our homes and the people in them.” 

For landlords, that proactive mindset can make a real difference. It can reduce disruption, support better tenant relationships, help protect the property and give more time to plan works properly rather than being forced into emergency action when winter arrives. 

Mould may be less visible in summer, but for known problem properties, the risk has not disappeared.  

The landlords who use this time wisely will be in a far stronger position when conditions change again.