A garden office room should be designed to be used throughout the year and in all weathers. This means you need it to be equipped to deal with everything from heatwaves to the coldest depths of winter.

For anyone who has been working in an office recently, whether their company office or in a modified room at home, the extreme heat will have presented a challenge, with fans on full blast, light clothing worn and, ideally, the abundant provision of ice cream.

How Hot Are British Summers Getting?

Moreover, the evidence is clearer than ever that this is part of a pattern showing that hotter summers are here and are the shape of things to come:

  • The Met Office has just issued a red heat warning for three days in a row, the first time it has ever done this
  • This year has seen the hottest days ever recorded for the months of May and June
  • 2025 was the hottest summer on record in the UK
  • The five hottest British summers on record have all occurred since 2000

Given these factors, any plans you have for a garden office room may focus a lot on the question of how you are going to keep it cool.

However, you must remember that even if extreme heat, as we have seen recently, is likely to become an increasingly frequent feature of the summer, there will still be plenty of days when it is nowhere near as warm, even in summer.

Moreover, when the cold and dark months come round, anything that is only equipped to deal with summer heat would be an uncomfortably chilly place to spend your working day.

Are Buildings Equipped For Summer Heat Any Good In Winter?

An example of this issue can be seen in the problem faced by Australian homes. They are built with a hot climate in mind, where the kind of temperatures seen in the recent heatwaves here are normal.

However, those same homes are not well equipped for winter, even though this is usually much milder than we experience. According to the World Health Organization, 81 per cent of homes are unable to maintain the recommended minimum temperature of 18 degrees C.

This is partly due to design flaws that neglect insulation, but also because architectural features designed to handle hot sunny days, such as high ceilings and large windows, become a liability when the temperature drops.

What this example shows is that a garden room built with Australian-style design features will not work. British winters may be milder than they were, but not as mild as those Down Under. A building only equipped to handle summer heat will be very chilly indeed.

Fortunately, the garden rooms we have designed and built for many years are equipped to deal with the vagaries of the British climate.

While the construction involves light gauge steel, this is accompanied by the use of excellent insulation on the floor, walls and roof, to ensure it is warm on cold days.

How To Keep The Garden Office Cool When It’s Hot

At the same time, there are also a lot of steps that you can take to make the room much cooler. Many of these are not structural, but involve the smart use of space and internal fixtures and fittings.

Among these are:  

  • Locating the garden room in a shady spot
  • Using blinds to keep the glare of the sun out, which is how they are commonly used in warmer countries such as Spain and Italy
  • Planting trees or shrubs outside the garden room to cool the air before it reaches it
  • Have houseplants inside the garden room
  • Use heat-absorbing colours for the internal décor. White is best, but lighter shades of green or blue can also be very effective

Perhaps the most radical idea of all would be to have a green wall inside the office, although this would mean having a strong internal frame in place and waterproof backing. It will also need to be sun-facing so the plants can get the light they need all year round.

However, if you can install this, it will lower the temperature by as much as five degrees C, as well as increase humidity when it is too dry and clean the air, which means you are breathing in less pollution.

With a few sensible design features and additions, you can do a lot to ensure that your garden room is well-equipped to help keep you cool on hot summer days.

Just as importantly, however, the way we construct them will ensure that it is well insulated when the cold days do come around, so you don’t end up shivering like an Australian.