A Ventilation Checklist For Landlords

Autumn is here, temperatures are starting to fall and condensation season is approaching. For landlords managing properties with a history of damp, black mould or poor ventilation, this is the time to act rather than waiting for problems to return during winter.

There is another reason why housing conditions are receiving increased attention this autumn. Awaab’s Law Phase 2 comes into force on 30 November 2026, extending the range of significant housing hazards covered by the legislation for social landlords in England.

Damp and mould are not new additions under Phase 2. Significant damp and mould hazards have already been covered since Phase 1 came into force in October 2025. What the latest changes reinforce, however, is the growing expectation that landlords identify the cause of housing hazards and take appropriate action to prevent them recurring.

For properties with condensation problems, ventilation should be an important part of that conversation.

Why Autumn Is The Time To Check Your Properties

Condensation problems often become obvious when outside temperatures fall. During summer, a property can appear perfectly dry. Windows are opened more frequently, temperatures are higher and the surfaces inside the home are generally warmer.

As autumn arrives, that changes. Windows remain closed for longer, heating starts being used and colder external temperatures create colder surfaces inside the property. Meanwhile, everyday activities such as showering, cooking and drying washing continue to add moisture to the indoor air.

If that moisture cannot escape effectively, condensation can begin appearing on windows, external walls and other cold surfaces.

By the time black mould becomes clearly visible, the conditions allowing it to grow may have been developing for weeks.

Awaab’s Law Has Changed The Approach To Damp And Mould

Awaab’s Law places specific requirements on social landlords in England when significant damp and mould hazards are identified.

Potential significant hazards generally need to be investigated within 10 working days. Where the investigation confirms a significant hazard, relevant safety work generally needs to be completed within five working days of the investigation concluding.

There are also requirements surrounding preventative work. Where further work is required to stop a significant hazard from recurring, social landlords generally need to begin that work, or take steps towards beginning it, within five working days of the investigation concluding.

That distinction is particularly relevant to recurring condensation and mould.

Cleaning mould may make an affected room safer in the short term. Providing a dehumidifier might help manage moisture temporarily. But neither necessarily addresses why the problem developed.

Where poor ventilation is identified as an underlying cause, the Government's own Phase 2 guidance specifically gives installing mechanical ventilation as an example of appropriate remedial action.

Cleaning Black Mould Is Not A Long-Term Ventilation Strategy

This is something we regularly come across when discussing properties with landlords. Black mould appears around a window, on an external wall or in the corner of a bedroom. It is cleaned and treated, the tenant is advised about heating and ventilation, and the problem appears to have been resolved.

Then winter arrives and the mould returns. Repeatedly treating the visible mould without understanding why the surface remains damp is unlikely to provide a lasting solution.

There can be many causes of damp and mould, including leaks, water penetration, insulation problems and building defects. These need to be properly investigated.

But where the problem is condensation, landlords also need to consider whether the property has adequate ventilation for the way it is occupied.

A Landlord’s Autumn Ventilation Checklist

If you manage properties with a history of condensation or mould, there are several areas worth reviewing before winter conditions properly arrive.

Start with properties where tenants have previously reported recurring condensation or black mould. A history of repeated problems can be an indication that the underlying cause hasn't been fully resolved.

It is also worth checking:

• Whether bathroom and kitchen extractor fans are present and operating correctly
• Whether existing vents have been blocked or are ineffective
• Whether windows are regularly experiencing heavy condensation
• Whether mould repeatedly develops in bedrooms or around external walls
• Whether the property feels excessively humid, stale or stuffy
• Whether previous mould treatments have been followed by improvements to ventilation

A ventilation assessment should form part of a wider investigation rather than replacing one.

If there is evidence of penetrating damp, leaks, structural defects or another source of moisture, those problems need to be addressed appropriately.

Look Beyond The Individual Mould Patch

One of the advantages of looking at ventilation across the entire property is that it moves the investigation away from one individual patch of mould.

A bedroom might be where the problem is visible, but the moisture may be generated elsewhere.

Showering can introduce significant moisture into the home. Cooking generates more. Washing and drying clothes adds further humidity. That moisture moves around the property.

This is why landlords can sometimes find mould developing in bedrooms even though the occupants aren't doing anything unusual within those particular rooms.

The question isn't simply where the mould is growing. It is how moisture is being produced, how it moves through the property and how effectively it is being removed.

Where Does PIV Fit Into A Landlord’s Ventilation Strategy?

Positive Input Ventilation can provide an effective whole-house ventilation solution for suitable properties.

A loft-mounted PIV unit introduces filtered air into the property through a central ceiling diffuser. This creates gentle positive pressure within the home, helping to encourage stale, humid air to leave through existing ventilation routes and natural leakage points.

The system operates continuously rather than relying on somebody remembering to open windows.

For landlords, this can be particularly useful in properties where recurring condensation and excessive indoor humidity have been identified as contributing to mould.

PIV is not a treatment for every form of damp. It will not repair a leaking roof, defective guttering or a plumbing leak.

But where an assessment identifies inadequate ventilation and condensation as part of the problem, a PIV installation can provide a practical long-term improvement to airflow throughout the home.

Why PIV Can Work Well In Rental Properties

One of the challenges landlords face is finding solutions that continue working without requiring significant daily intervention from the tenant.

A dehumidifier can reduce humidity, but somebody needs to operate it correctly and, depending on the model, empty the water tank. Opening windows can improve ventilation, but that relies entirely on occupant behaviour and becomes less appealing during colder weather.

A correctly installed PIV unit is designed to operate continuously. Once installed and commissioned, filtered air is continually introduced into the property without the tenant having to switch the system on every morning or move equipment between rooms.

This makes PIV particularly interesting for landlords looking for a permanent ventilation improvement rather than another temporary response to recurring condensation.

Working With Landlords At ClearAIR

At ClearAIR, we regularly work with landlords and property owners dealing with condensation, black mould and ventilation problems within rental properties.

Our process is designed to make assessing a property straightforward, particularly where the landlord doesn't live locally or the property is occupied by a tenant.

We initially collect information about the property and the problems being experienced. For a potential PIV installation, we'll normally require photographs of the loft space, loft hatch and dimensions, fuse board and the landing area where the PIV diffuser could be positioned.

This allows us to establish whether one of our loft-mounted PIV units is likely to be suitable before arranging the installation.

Where required, the landlord can arrange for the tenant or managing agent to provide the photographs, allowing us to deal directly with whoever has access to the property while keeping the landlord informed.

PIV Installation For Landlords

ClearAIR specialises in domestic loft-mounted PIV installations. Our Vent-Axia PIV system costs £945 fully supplied and installed. Our Nuaire Drimaster ECO Heated PIV system costs £1,045 fully supplied and installed.

Where the property's existing electrical installation requires a Type A RCD fused spur, this can be installed for an additional £75.

Our installations include the PIV unit, installation and commissioning, with the appropriate electrical certification provided following the work.

For landlords managing multiple suitable properties, we can also use the same assessment process to identify which homes are appropriate for PIV installation and which require further investigation.

Don’t Wait For The First Cold Week

The worst time to start thinking about condensation is when the tenant sends photographs of a bedroom covered in black mould in the middle of winter. Properties with a known history of condensation can be reviewed now.

Check the extraction. Look at previous reports. Identify properties where mould has repeatedly returned. Establish whether the existing ventilation is working properly and investigate the cause where problems remain unresolved.

Where poor ventilation and excessive humidity are identified, taking action before colder weather arrives can put the property in a much better position for the winter ahead.

Awaab’s Law has placed much greater emphasis on responding quickly to serious housing hazards. But prevention is just as important.

For landlords, improving ventilation before condensation develops into another mould problem can be considerably more effective than dealing with the same problem again in January.

PIV Installations From ClearAIR

At ClearAIR, we specialise in loft-mounted domestic PIV installations for homes experiencing condensation, mould and poor indoor air quality.

We currently install two leading PIV units.

Our Vent-Axia PIV system costs £945 fully supplied and installed, while our Nuaire Drimaster ECO Heated PIV system costs £1,045 fully supplied and installed.

The Nuaire Drimaster ECO Heated is our premium option, providing continuous filtered ventilation together with an integrated heater designed to temper incoming air during colder conditions.

Where the existing electrical installation requires a Type A RCD fused spur, this can be installed for an additional £75.

Before recommending a PIV installation, we'll ask for some basic information about the property along with photographs of the loft access, loft space and fuse board. This allows us to establish whether one of our loft-mounted PIV units is likely to be suitable.

Frequently Asked Questions

Does Awaab’s Law apply to all landlords?

The current Awaab’s Law requirements discussed here apply to social landlords in England. Private landlords have separate legal obligations concerning the condition, safety and fitness of their rental properties.

Does Awaab’s Law already cover damp and mould?

Yes. Significant damp and mould hazards have been covered since Phase 1 came into force in October 2025. Phase 2 comes into force on 30 November 2026 and expands the range of significant hazards covered.

Can a landlord just clean mould from a property?

Cleaning mould may form part of making an affected property safe, but the underlying cause should also be investigated. Where further preventative work is required to stop a significant hazard recurring under Awaab's Law, social landlords have additional responsibilities concerning that work.

Can poor ventilation cause black mould?

Poor ventilation can contribute to excessive indoor humidity and condensation. If surfaces remain damp, this can create conditions in which mould is able to develop.

Is a dehumidifier a permanent solution for condensation?

A dehumidifier can be useful for reducing indoor humidity and may be appropriate as a temporary measure. However, it does not provide continuous fresh-air ventilation or correct an underlying ventilation deficiency.

Can landlords install a PIV unit in a rental property?

Yes, providing the property is suitable. Loft-mounted PIV units are commonly installed in houses to improve whole-house ventilation and help manage excessive humidity and condensation.

Does installing a PIV unit make a property compliant with Awaab’s Law?

There is no individual product that automatically makes a property compliant with Awaab’s Law. Hazards need to be properly investigated and the appropriate remedial action taken. Where inadequate ventilation is identified as an underlying cause of a damp and mould hazard, mechanical ventilation may form part of the solution.

How much does a PIV installation cost for a landlord?

ClearAIR currently charges £945 fully supplied and installed for a Vent-Axia PIV system and £1,045 for a Nuaire Drimaster ECO Heated PIV system. A Type A RCD fused spur can be installed for an additional £75 where required.

Can ClearAIR deal directly with my tenant?

Yes. Where appropriate, we can obtain the information required to assess a potential PIV installation from the tenant or managing agent while dealing with the landlord regarding the quotation and installation.

Prepare Your Rental Property For Condensation Season

Autumn provides landlords with an opportunity to get ahead of condensation rather than waiting for the familiar winter problems to return.

If you have a rental property with a history of wet windows, recurring black mould, high humidity or poor airflow, now is a sensible time to investigate the ventilation.

At ClearAIR, we work with landlords to assess suitable properties and provide professionally installed PIV units designed to improve whole-house ventilation.

If you manage one property or a larger portfolio, speak to our team about your PIV installation requirements and whether Positive Input Ventilation could provide the right solution for your rental property.