How to Turn a Garden Building Into a Home Office

What Does It Take to Convert a Garden Building Into a Home Office?

Converting a garden building into a home office usually involves:

• Damp-proofing the building
• Installing electricity
• Adding insulation
• Installing heating
• Putting down suitable flooring
• Improving lighting and ventilation
• Adding security measures.

The exact work will depend on the condition of the building and how you plan to use the space.

If you're still deciding whether to buy a new building or convert an existing one, take a look at our range of timber garden offices.

If you're planning a new building rather than converting an existing one, this article about designing an insulated garden studio for year-round use explains what to consider before you buy.

How Much Does It Cost to Convert a Garden Building Into a Home Office?

The cost of converting a garden building into a home office depends on the condition of the building and how much work is needed. As a rough guide, a basic conversion typically costs between £2,000 and £5,000, while a more extensive project with higher-quality finishes can cost £8,000 to £10,000 or more. 

Some of the biggest costs can include:

• Insulation
• Electricity
• Heating
• Flooring
• Plasterboarding and decorating
• Plumbing, if you want running water or a toilet

If your garden building already has a solid structure, the work may be relatively straightforward. However, if it needs extensive repairs or several upgrades, the overall cost can increase quickly.

Once you add insulation, electrics, heating and interior finishes, converting an older building can cost a similar amount to buying a purpose-built garden office that's designed for year-round use from the outset.

Why Convert A Garden Building Into A Home Office?

Converting a garden building into a home office gives you a dedicated workspace away from the distractions of the house. Even a short walk across the garden can help create a healthier separation between work and home life, making it easier to stay productive during the day and leave work behind in the evening.

You'll also save the time and cost of commuting while creating a workspace that's designed around the way you work. If your needs change in the future, the building can easily become a hobby room, studio, gym, or guest accommodation, making it a versatile addition to your home.

Before converting or replacing a garden building, it's worth checking whether planning permission applies. In many cases, garden offices fall under permitted development, but the rules depend on factors such as the building's height, location, and intended use. Read our planning advice for timber buildings to learn more.

You can also find more information on the Planning Portal.

A Step-by-step Guide to Turning A Garden Building Into A Home Office

Damp-proof The Building

Damp can damage timber, decoration and insulation if it's left untreated, so it's worth dealing with any moisture issues before you start the conversion. 

Make sure no vegetation touches the building, treat any exposed timber with a suitable wood preservative, and fill in any gaps in the window and door frames with foam filler or liquid wood. If your garden building has a concrete base, fit a damp-proof membrane. Finally, plan for adequate ventilation and heating.

Good ventilation also helps reduce condensation and mould. The NHS advice on damp and mould explains why controlling moisture is important for your health as well as your building.

Plumb In Water 

At this point, if you want to have running water, you’ll need to decide whether to plumb it in or not. If you need potable water, installing new water pipes connected to the mains is the only option. To do this, you’ll likely need to employ a plumber. If the building is quite far from the house,  it can be a costly addition. 

Alternatively, you can install guttering and a water butt. You could bring over drinking water in a flask or big bottle from the house and use the water collected by the system to clean the garden office and water the plants.

Find A Heating Solution

A warm, comfortable workspace makes it much easier to concentrate throughout the day. 

There are many options to heat up a small space. Some, like underfloor heating, are quite expensive to install and repair. Others, such as portable radiators, convection heaters, electric radiators, and tube heaters rely on having electricity and or plumbing fitted. 

Whatever heating system you choose, make sure the building is well insulated and properly ventilated to help reduce condensation and damp.

Install A Bathroom

If you plan to spend long days working in your garden office, you may want to include a toilet.

A traditional toilet will need to be connected to your home's water supply and drainage system, which can add significantly to the cost of the project. If that's not practical, a composting toilet can be a more affordable alternative that requires very little installation.

If you think you might add a toilet in the future, it's worth planning for it during the conversion. 

Fit The Garden Building With Electricity

Most home offices need a reliable electricity supply for lighting, heating, computers, and charging devices. If you plan to use your garden office every day, it's worth asking a qualified electrician to connect the building to your home's electrical system.

It's also worth thinking about your internet connection before you start work. A strong, reliable connection makes video calls, large downloads, and day-to-day tasks much smoother. If your Wi-Fi doesn't reach the garden, a Wi-Fi extender, mesh network, or Ethernet cable can often solve the problem.

If you only plan to use the building occasionally, you might not need a permanent electrical connection straight away. Portable power stations or small solar systems can work well if you only use the office a few times a week. But bear in mind that they may not provide enough power for heating or several electrical appliances.

Electrical work in outbuildings should comply with UK Building Regulations. You can find more information in the government's guidance on Approved Document P: Electrical Safety.

Install Insulation

Adding insulation to the floors, walls, and ceiling will be a game changer. Your garden office will stay warm in the winter and cool in the summer. Insulation can also reduce outside noise, creating a quieter and more comfortable place to work.

To help keep dampness at bay, add a breathable membrane to the insulation.

Purpose-built garden offices often already include insulation.

Install Floors

Once you've insulated the floor, you'll need to choose a suitable floor finish.

For a quick and easy DIY solution, opt for a good-quality laminate. Remember that you’ll be coming into the studio from your garden, so your shoes may get muddy or wet on the way.

Install Plasterboard

To cover the insulation, install plasterboard and decorate it to suit your workspace. It's a straightforward job, and plasterboard sheets are widely available from DIY stores.

If you want your garden office to look more refined, add baseboards, crown moulding, and window casing. You can add these in at a later stage.

Think About Security

Consider installing quality locks, security lighting, reinforced doors or an alarm system. It's also worth thinking about how visible the building is from the road and how easy it is to access your garden.

Taking a few simple security measures can give you peace of mind when you finish work for the day or leave the property unattended.

Create A Garden Office That Works For You

If converting an existing building into a home office isn't the right option for you, a purpose-built timber garden office could be a better fit. 

At Olson Timber Buildings, we design and build bespoke timber garden offices in a range of sizes and layouts, with insulation, windows, doors, and finishes tailored to your needs.

Whether you already have a design in mind or need help planning the space, our team will be happy to help you create a comfortable workspace you'll enjoy using for years to come.