Air Conditioning in New Build Homes Across Surrey

Why airtight homes can still overheat

New build homes across Surrey are constructed to far higher insulation and airtightness standards than the older housing stock in Cheam and the surrounding towns, which is good news for heating bills but can be a mixed blessing in summer. A well-sealed house that's efficient at keeping heat in during winter is often just as efficient at trapping heat during a warm spell, particularly in rooms with large windows or south-facing glazing.

This is why we get a steady stream of enquiries from owners of relatively new houses who assumed, reasonably enough, that a modern property wouldn't need cooling.

Large glazed areas and overheating

Many new developments favour large windows, bi-fold doors and sometimes glazed gable ends to maximise natural light, which is appealing for most of the year but can turn a living space or main bedroom into a heat trap during sustained warm weather. Upper floor bedrooms directly under a warm roof space are frequently the rooms that prompt the first enquiry.

Building warranty and NHBC considerations

New build properties are typically covered by a structural warranty, commonly through the NHBC or a similar provider, during the early years of ownership. Any alterations, including drilling for air conditioning pipework, should be checked against the terms of that warranty beforehand, since some providers have specific requirements around external wall penetrations.

We're happy to work alongside whatever documentation or guidance your warranty provider requires, but it's worth having that conversation before committing to a particular wall or room.

Points worth checking on a new build before installation

• Whether your NHBC or warranty provider has requirements around wall penetrations
• Whether the property is on a managed estate with an estate management company covering external alterations
• Cladding or render type, which can affect fixing methods
• Whether mechanical ventilation with heat recovery is already fitted, which interacts with room airflow

Mechanical ventilation and how it interacts with cooling

Some newer developments include mechanical ventilation with heat recovery systems, designed to manage air quality and retain heat in winter. Where this is fitted, we take it into account when planning an air conditioning installation, since the two systems need to work sensibly alongside each other rather than fighting for control of the room's temperature and airflow.

Estate management companies and external alterations

Many new developments across Surrey are run by an estate management company responsible for maintaining communal areas and, in some cases, setting rules about external alterations to individual properties. It's worth checking your estate's specific rules before finalising outdoor unit placement, as some estates have preferences around where equipment can be sited or how it should be screened.

Rendered and cladded exteriors

A number of new build developments use render, timber cladding or composite panels rather than traditional brick, which can affect how an outdoor unit bracket is fixed and how pipework penetrations are sealed to maintain weatherproofing. We adapt our fixing approach to the specific wall finish rather than assuming a standard brick fixing will apply.

Sizing for a well-insulated property

Interestingly, a well-insulated new build sometimes needs a smaller cooling capacity than an equivalent older, less insulated property, since the fabric of the building itself is doing more work to keep temperatures stable. Correct sizing still depends on room dimensions, glazing and orientation, so we go through the same survey process regardless of how new the property is.

Getting it right from the outset

If you own a new build home in Surrey and are finding certain rooms overheat despite the property's modern credentials, it's worth getting a survey done that specifically considers your warranty position, estate rules and wall construction, rather than assuming the same approach used on an older house nearby will automatically apply.