As working from home becomes more and more popular, people are finding that their homes don’t feel as big as they used to. While some homeowners are building extensions or loft conversions to use as home offices, others don’t want to go to the expense or hassle. That’s where garden offices come in.

A garden office is an ideal solution to give you more space to work from home, while still helping you to have some work-life balance. Simply shut the door on your garden office at the end of the day and take the short commute home!

So how much do garden offices cost? Read our guide to find out.

How much does a garden office cost?

How much a garden office costs depends on the type, size and material, but the average purpose-built garden office costs £10,000.

The final cost of your garden office will depend on a variety of factors:

• Type: Prefabricated ‘pods’ could cost as little as £1,500, while large, brick-built garden offices could set you back as much as £30,000

• Material: Timber garden offices tend to be cheaper than brick or composite materials

• Size: As you’d expect, the larger your garden office is, the more it will cost. However, the cost per square metre will probably reduce the larger your garden office is

• Additional features: Elaborate designs, separate rooms or bathrooms will cost more. If you choose to have a toilet in your garden office, expect this to add at least £1,000 onto the final cost

• Your location: Where you live is one of the biggest factors affecting the cost of your garden office. If you live in London or the south east of England, you’ll pay more than those in other areas of the UK.

At HaMuch, we use the hourly and daily rates of tradespeople across the country to give you a more accurate estimate for your project. Take a look at the table further down the page to find an estimate for a garden room in your local town or city.

Types of garden office building

Prefabricated modular units

Prefabricated modular garden offices are becoming increasingly popular due to their quick installation. These units are manufactured off-site and then assembled on-site, reducing construction time and costs.

Modular garden offices come in various sizes and designs, with options to customise features such as windows, doors, and internal fittings. Prefabricated units are typically made from materials like timber, or composite panels, and are usually insulated.

A great benefit to this type of garden office is that they can be easily relocated if needed, making them an attractive option if you know you might want to move home in the future – simply bring your office with you!

Custom-built timber structures

Custom-built timber garden offices give you the opportunity to have a fully bespoke design tailored to your requirements. Timber is a popular choice for its natural look, offering a complementary look for your garden.

The benefit of timber garden offices is that you can choose the size, layout, and features, with options to include heating, lighting and storage.

While you might have to wait longer for installation and pay more compared to prefabricated options, you can personalise your workspace so it’s exactly what you need to be more productive when you’re working from home.

Brick garden offices

Brick garden offices are ideal if you want a more permanent structure that has the best form of insulation and will last the longest. They’re the most versatile option, as you’ll be able to add separate rooms or even a toilet or wet room if you like.

Brick structures will require proper foundations and things like plastering and cladding, so they cost considerably more. However, they are likely to increase the value of your property the most as once constructed, they won’t need maintenance like wood treatments or painting regularly, and they can serve lots of different purposes.

How long does it take to build a garden office?

How long it takes to build a garden office will depend on the type of structure you’ve chosen, but on average it will take 3-7 days to build.

Prefabricated modular units could be built within 2 days, whereas brick garden offices could take a week or more.

Other factors that can affect the time it takes to build a garden office include:

• Size of the garden office

• Complexity of design

• Amount of preparation required

• Additional features such as bathrooms

• Materials used

• Weather conditions

• Supplier lead times

It’s best to speak to your builder about how long to expect your garden office to take so you can manage expectations and plan to work elsewhere while work is going on if necessary.

Do you need foundations for a garden office?

Yes, you do need foundations for a garden office. Foundations will keep the structure stable and prevent moisture from entering, causing damp and mould. You’ll need different foundations depending on the type of structure you choose and what your budget is. There are a few different types of foundation you can use for a garden office:

• Concrete slab: A poured solid concrete base that distributes the weight of the garden office evenly. It’s a long-lasting type of foundation, but it is more labour-intensive than other options, so can be more expensive. It also takes up to 2 weeks for the concrete to cure, which can slow down build times.

• Wooden frame: A wooden frame base made from pressure-treated timber. It takes the garden office off the ground to prevent moisture from seeping in. These bases are a cost-effective option and is suitable for level ground, but it won’t be suitable for heavy structures or brick garden offices.

• Concrete piers: Ideal for areas with unstable soil conditions, these concrete pillars penetrate the soil and help distribute the weight of the garden room over the area. They don’t need time to set and offer long-lasting protection against movement and dampness.

• Screw piles: Steel piles that are screwed into the ground. These foundations are becoming increasingly popular as they’re less invasive and more eco-friendly. They offer a secure foundation without extensive excavation, but the soil needs to be settled and compact as loose soil may cause instability.

Your builder will advise you on the best type of foundations for your garden office, but having a basic understanding of the different types will help you to interpret the quotes you receive.

Can I run a business from a garden office?

Yes, you can run a business from a garden office. Many entrepreneurs and remote workers opt for garden offices as they offer a dedicated workspace away from the distractions of the main house, and give you a chance to shut the door on your work for the evening.

Whether you're freelancing, consulting, or operating a small business, a garden office can provide a professional environment to conduct meetings, work on projects and meet deadlines. However, you should check that your home insurance and mortgage providers allow you to run a business from your home before you start.

Is a garden office tax deductible?

A garden office isn’t fully tax deductible. You can’t deduct the cost of the construction of your garden office, but you can deduct the fixtures, fittings and furniture as a business cost.

There are certain items within your garden office that you can claim for:

• Electricity and heating

• Insulation

• Ventilation

• Sanitary ware like toilets and wash basins

It’s worth speaking to an accountant about your garden office to understand the tax implications. There may be capital gains tax due if you sell your property and you have a brick-built garden office, so it’s worth talking through your options with a tax advisor.

Does a garden office add value to your home?

Yes, a garden office can add value to your home – if it’s done properly. A well-designed and constructed garden office can appeal to buyers looking for a separate workspace or additional living space, which may increase the property's marketability.

However, how much a garden office adds to the value of your home will depend on factors such as the quality of construction, local market conditions and buyer preferences – while some buyers may be attracted to a garden office, others may be put off if they would prefer to have the extra garden space.

Do you need planning permission for a garden office?

In many cases, garden offices may be considered permitted development and not require planning permission, particularly if they meet certain criteria such as size, height, and placement within the garden.

However, there are exceptions and limitations, particularly in conservation areas or listed buildings. It's always best to check with your local planning authority before you start your garden office project, as they can fine you or even ask you to remove your garden office if it’s decided that you should have sought planning permission.

To prevent problems with your local building control in the future, you could apply for a Certificate of Lawfulness that provides assurance that your garden office complies with permitted development rights.

Are garden offices warm in winter?

Yes, garden offices are warm in winter if they’ve been insulated. If you want comfortable working conditions throughout the year, you will need to insulate your garden office. Modern garden office designs can incorporate high-quality insulation materials, double-glazed windows and efficient heating systems to maintain a comfortable temperature even in cold weather.

Plus, you could create an even cosier atmosphere with options such as underfloor heating, wood burners or electric heaters to provide additional warmth during the winter months. It’s also important to install proper ventilation to prevent condensation and maintain air quality inside the garden office.

Can I live in a garden office?

While garden offices are primarily designed as a workspace, some people may using them as a temporary or secondary accommodation option. However, you need full planning permission if you want to live in a garden office full time.

A garden office that’s being lived in full time would be considered a granny annexe, which have much stricter rules. You should get specialist advice if you want a garden office to be self-contained accommodation, as you’ll need to apply for planning permission and let neighbours know your intentions.

However, if you want to use your garden office as an occasional guest room or living space, you won’t require planning permission.

Are garden offices worth it?

Whether garden offices are worth it is a personal decision. For many homeowners, a garden office can provide a valuable and versatile space for working, hobbies or relaxation, offering separation from the main house and creating a productive environment.

Additionally, garden offices can add to the overall appeal of your property, potentially increasing its value and desirability to future buyers. However, the decision to invest in a garden office should be carefully considered in terms of budget, space availability and long-term goals.

By weighing up the costs and benefits and considering your needs, you can determine whether a garden office is a worthwhile investment for your property.

Now you know everything that’s involved with building a garden office, it’s time to get quotes. Post your job on HaMuch now and we’ll put you in touch with local builders who can give you a detailed price.

Estimates for common extension builder jobs;

Rates for other trades