Are UK Homes Ready for Hotter Summers?
Hotter summer weather is becoming harder for UK homeowners to ignore. Is your home designed to stay comfortable when temperatures rise?
For generations, the main challenge for British homeowners has been straightforward: how do we keep our homes warm?
Our houses have traditionally been designed around cold winters. We install insulation, double glazing, draught-proofing and efficient heating systems to stop valuable heat escaping.
That still makes perfect sense.
But there is another question that is becoming increasingly important:
How well does your home cope when it gets hot?
That is no longer a theoretical question.
Summer 2025 was the warmest UK summer in records going back to 1884. Then 2026 brought another remarkable period of hot weather. England experienced its warmest June on record, the UK recorded a new June maximum temperature of 38.0°C, and by the middle of July 2026 the UK had already experienced more days above 30°C than during the whole of the famous summer of 1976.
For the first time on record, temperatures of at least 35°C were recorded in the UK during May, June and July of the same year.
For homeowners, the message is fairly straightforward.
We need to start thinking about how our homes perform in summer as well as winter.
British Homes Were Primarily Designed to Keep Heat In
Much of the UK's housing stock was built at a time when overheating was not a major design consideration.
The priority was normally keeping occupants warm through a long British winter.
Over recent decades we have made those homes increasingly energy efficient by adding:
Loft insulation
Cavity and solid-wall insulation
Double and triple glazing
Draught proofing
Better airtightness
More efficient heating systems
These improvements can significantly reduce winter heat loss and energy consumption.
But a modern home also needs to manage unwanted summer heat.
A house that performs brilliantly on a cold January morning may still become extremely uncomfortable during several consecutive days of hot weather.
Why Do Some Homes Become So Hot?
There is rarely one single reason.
Overheating can result from a combination of the property's design, construction, orientation and the way it is used.
Large Areas of Glazing
Large bifold doors, sliding doors and floor-to-ceiling windows can transform a home.
They bring in daylight and create a connection between the house and garden.
But sunlight passing through large areas of glass can also create considerable solar heat gain.
This can be particularly noticeable with south- and west-facing glazing.
Loft Conversions
Loft rooms sit directly underneath the roof and can become some of the hottest areas of the house.
Roof windows can also receive strong direct sunlight.
Good insulation helps, but ventilation, glazing, shading and the overall roof design can also affect summer comfort.
Modern Extensions
The modern preference for large glazed extensions, rooflights and lanterns can create beautiful spaces.
But badly considered solar gain can turn that beautiful family room into somewhere that is difficult to use on a very hot afternoon.
Upper-Floor Bedrooms
Heat naturally builds within a property and bedrooms can remain uncomfortable long after the outside temperature has started to fall.
That becomes particularly noticeable when hot weather continues for several days and the building has little opportunity to cool overnight.
Limited Ventilation
Opening windows is not always the complete answer.
Noise, security, pollution and the layout of the property can limit effective natural ventilation.
And when the air outside is extremely warm, opening a window may provide surprisingly little cooling.
Overheating Is Now Part of Building Regulations
The importance of overheating is reflected in the Building Regulations.
Approved Document O – Overheating came into effect in England in June 2022 and introduced specific requirements aimed at reducing overheating in new residential buildings.
It does not mean that every existing house suddenly requires major alterations.
But it demonstrates an important change in the way residential buildings are being considered.
A comfortable home needs to deal with excessive summer heat as well as winter heat loss.
That principle is worth considering whenever an existing property is being renovated, extended or upgraded.
The First Step Is Often Keeping Heat Out
When a house becomes too hot, the immediate thought may be:
Do we need air conditioning?
Possibly.
But mechanical cooling should not automatically be the first improvement.
It is often worth looking first at why the house is getting hot.
Depending on the property, possible improvements could include:
External shading
Awnings
Solar-control glazing
Blinds or shutters
Improved roof insulation
Improved wall insulation
Better natural ventilation
High-level opening windows
Appropriate rooflights
Smart ventilation controls
Trees and carefully positioned planting
Preventing unnecessary heat entering the home can reduce the amount of cooling required later.
Insulation Isn't Just for Winter
This is something homeowners sometimes overlook.
We normally associate insulation with keeping a property warm.
But insulation works by slowing heat transfer.
During winter it helps prevent valuable heat escaping from the home.
During summer it can also help slow heat travelling through a hot roof or external wall into the rooms below.
This is particularly relevant to loft conversions and rooms directly below heavily exposed roofs.
The best results usually come from looking at insulation, ventilation, glazing and shading together rather than treating each improvement separately.
Does Air Conditioning Now Have a Place in UK Homes?
For many years, domestic air conditioning in Britain was regarded as something of a luxury.
For some homes, that view may be changing.
A property does not necessarily need to be cooled from top to bottom.
Targeted cooling may make much more sense.
For example:
A south-facing home office
A loft bedroom
A heavily glazed extension
A bedroom that becomes uncomfortable at night
A principal living room exposed to strong afternoon sunlight
Modern air-conditioning systems can also provide heating.
Many are effectively air-to-air heat pumps, capable of providing efficient heating during cooler weather and cooling when temperatures rise.
This makes them very different from the traditional idea of an appliance that sits unused for most of the British year.
Solar Panels and Air Conditioning Can Work Together
This is where modern green-home technology starts to become particularly interesting.
Air conditioning requires electricity.
But the periods when cooling demand is greatest are frequently also periods when a solar PV system can be producing significant amounts of electricity.
That creates the possibility of using electricity generated on the roof to help cool the house below.
Combine solar panels with:
Battery storage
Smart controls
Time-of-use electricity tariffs
Smart EV charging
Hot-water controls
Efficient heating and cooling
and the home begins to operate as an interconnected energy system.
Instead of simply buying a collection of individual products, homeowners can start thinking about how the technologies work together.
Your Home May Already Be Showing You What Needs Attention
Think about your own property during the hottest weather this summer.
Which room becomes uncomfortable first?
Does the loft become excessively hot?
Does your extension heat up in the afternoon?
Are certain bedrooms difficult to sleep in?
Does strong sunlight pour through particular windows?
Does the house remain hot well into the evening?
Do you find yourself closing curtains throughout the day simply to keep rooms bearable?
These are useful clues.
The answer may be shading.
It may be improved ventilation.
It may be additional insulation.
It could involve changing glazing or installing solar-control measures.
Or there may be certain rooms where targeted mechanical cooling makes sense.
Every house needs to be considered individually.
Think About Summer Before Building Your Extension
Changing summer conditions are also worth considering before carrying out major building work.
A large rear extension incorporating six metres of glazing and several rooflights may look fantastic on the drawings.
But how will it feel during a week of temperatures above 30°C?
The orientation of the property matters.
So does the size and position of the glazing.
The amount of opening ventilation matters.
Shading matters.
Insulation matters.
The same applies to loft conversions.
The objective should not simply be to satisfy minimum requirements.
Good home design should create rooms that are pleasant to use throughout the year.
Green Homes Should Be More Comfortable Homes
There is an important point here.
Making homes greener should not simply be about lowering numbers on an energy bill or installing the latest piece of technology.
There should be a lifestyle benefit too.
A properly considered home could potentially be:
Warmer in winter
Cooler in summer
Cheaper to operate
Better ventilated
More comfortable to sleep in
Easier to control
Less dependent on purchased electricity
Better prepared for future energy needs
That is a much more useful definition of a green home.
There Is No Universal Green Home Shopping List
A Victorian terrace is very different from a 1930s semi-detached house.
A modern apartment is different again.
So is a detached rural property.
The construction, orientation, roof area, glazing, heating system, garden, electricity consumption and lifestyles of the occupants can all be different.
One homeowner may obtain the greatest benefit from solar panels.
Another may need insulation first.
Another could benefit from a battery.
Another may need improved ventilation and shading.
And another may discover that a relatively small air-conditioning system transforms the usability of an overheated loft bedroom.
This is why APN Green Homes starts with the home rather than the technology.
Every home is different. Your green home plan should be too.
NEXT STEPS
If your home has become uncomfortable during the increasingly hot periods we are experiencing or you are planning improvements and want to create a home that performs better throughout the year, APN Green Homes can help you work out what is worth doing and in what order.
Rather than simply recommending individual products, we can look at your property as a whole and consider opportunities to improve comfort, energy efficiency, running costs and the long-term quality of your home.
Choose the option below that suits you.
BOOK A GREEN HOME SURVEY
Get a detailed assessment of your property and practical recommendations covering areas such as overheating, insulation, glazing, ventilation, shading, heating, air conditioning, solar PV, battery storage and smart controls.
BOOK A PHONE CONSULTATION
Talk through the rooms that are overheating, your property and any improvements you are already considering. We can help you identify the most sensible next step.
EMAIL US
Send us details of your home, photographs and the problems you are experiencing and we can advise you on the appropriate way forward.
GIVE US A CALL
Prefer to talk it through? Give us a call, tell us what is happening in your home and what you would like to achieve.
Tel: 0370 042 2021
Don't just make your home cooler for the next heatwave. Make it more comfortable and efficient throughout the year.
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