In summer, a garden office feels like the best decision you ever made. The door is open, the light pours in and the walk to work takes ten seconds.
Then October arrives. The mornings get dark, the air turns damp, and you start to wonder if you will be back at the kitchen table by Christmas.
You do not have to be. A well-built garden office can be used every day of the year. This guide covers the three things that matter most in the colder months: heat, light and damp. It also explains what to check now, before the first frost.
Start with the building itself
No heater in the world can fix a building that leaks heat. Before you think about radiators or lamps, think about what is inside the walls.
A standard summer house has a single skin of timber. It is lovely in June, but in January the warmth you pay for goes straight out through the walls and roof. If you are not sure which type you have, our guide to an insulated garden room vs a standard summer house explains the difference in plain terms.
A garden office built for winter needs insulation in three places: the walls, the roof and the floor. Here is how ours are made, taken from our lined and insulated building specification:
- Walls: heavy-duty 38mm x 75mm framing, filled with 100mm Earthwool insulation and lined inside with 16mm tongue and groove boards.
- Roof: insulated in the same way as the walls, with tongue and groove boarding on the inside.
- Floor: 13mm polystyrene insulation under 18mm interlocking chipboard.
- Windows: double-glazed, with toughened glass in the doors.
- Weather layer: a breather membrane between the cladding and the frame to keep wind and rain out.
The walls work out at 0.49W/m²K. In simple terms, that means they hold heat about as well as a solid timber wall 300mm thick. That is what lets a small heater do a big job.
Heat: how warm should it be?
The Health and Safety Executive guidance on workplace temperature says an indoor workplace should normally be at least 16°C. That rule is written for employers, but it is a useful target for anyone working from home too. Below 16°C, most people start to feel cold, stiff and slow.
There are several ways to reach that temperature. The right one depends on the size of your building and how many hours you spend in it.
| Heating option | How it works | Best for | Things to know |
|---|---|---|---|
| Electric panel heater | Warms the air with a slim wall-mounted panel | Small and medium offices used most days | Cheap to buy, quiet, and most have a timer and thermostat |
| Oil-filled radiator | Heats oil inside, which then gives off steady warmth | Part-time use, no fitting needed | Plug in and go, but it takes up floor space |
| Infrared panel | Warms people and surfaces rather than the air | Draughty spots or high ceilings | Feels warm quickly, can be fixed to a wall or ceiling |
| Air to air heat pump | A wall unit that pulls warmth from outside air | Larger offices used all day, all year | Higher fitting cost, but very cheap to run and can cool in summer |
| Fan heater | Blows warm air quickly | Quick warm-up only | Noisy and costly to run for long periods, so not a main heater |
A good tip is to set a timer so the heat comes on half an hour before you start. You walk into a warm room, and you are not paying to heat an empty building all night.
Remember that any power supply run out to a garden building must be fitted by a qualified electrician. This keeps you safe and protects your home insurance.
Light: beat the dark afternoons
By December, it can be dark by four o’clock. Poor light makes you tired and strains your eyes, so it is worth planning properly.
- Use layers of light. A bright ceiling light for the whole room, plus a desk lamp for close work.
- Pick cool white bulbs for working. They feel more like daylight and help you stay alert. Warm white bulbs are better for relaxing in the evening.
- Place your desk side on to the window. Facing the glass causes glare on your screen. Sitting with your back to it puts you in your own shadow.
- Clean the windows in autumn. Summer dust and pollen block more light than you might think.
- Add an outside light. A simple light by the door, or along the path, makes the walk back to the house safer on dark evenings.
Damp: stop condensation before it starts
Condensation is the most common winter problem in any garden building. It happens when warm, damp air touches a cold surface, such as a window, and turns back into water.
You breathe out moisture all day. A hot drink adds more. In a small room, that adds up fast. Here is how to keep it under control:
- Keep the heat steady. A building that is warmed and then left to go cold every day gets more condensation than one kept at a low, steady temperature.
- Let some air in. Open a window for ten minutes each day, even in winter. Trickle vents help too.
- Do not dry wet coats or umbrellas inside. Leave them in the house.
- Wipe the windows if you see water on the glass in the morning.
- Think about a small dehumidifier if your office is used for long hours, or if you store paper, books or art supplies inside.
Good insulation helps here too. When the inside of the walls stays warm, there are fewer cold spots for water to settle on.
Your autumn checklist
Spend an hour on these jobs in October or November, and your garden office will be ready for the winter ahead.
- Clear leaves from the roof and gutters so rain can run away freely.
- Check the roof covering for loose or lifted areas.
- Look at the door and window seals for gaps or wear.
- Check the outside timber and treat any bare patches.
- Make sure the base is clear, and water is not pooling around it.
- Test your heater, timer and lights before you really need them.
- Trim back any plants that touch the walls, as they trap damp against the timber.
Thinking of a garden office you can use all year?
We have been building timber garden buildings in Danbury, Essex since 1951. Every one of our garden offices and studios is fully lined and insulated as standard, and made to suit your garden, your size and the way you work.
If you would like a warm, quiet place to work this winter and every winter after it, send us an enquiry with your postcode and the size you have in mind. We will give you an honest answer and a clear price.