What Affects The Cost Of A Garden Room? - Space Craft Designs

What Affects The Cost Of A Garden Room

What Affects The Cost Of A Garden Room?

So you’ve decided you need some additional space to stretch out from your main property. The prices between one garden room and another can vary greatly. It goes without saying that straightforward storage space will cost more than a sizeable multi-use annexe, but what other facts affect the total cost of a garden room?

Have a read below of some of the items that will affect the cost of a garden building

Location and Accessibility

Before actually beginning the installation of a garden room, a site survey will often be conducted to ensure that the desired space is suitable for a garden room. This site survey will probably include looking at suitability, access and drainage. If the site needs clearing of trees, shrubs or low branches, for example, and you are unable to do this yourself, you will likely need the input of a landscaper or arborist at this time. If drainage is required, then pipework for water or sewage will also need to be fitted before the installation.


Really that the size of a garden room is the most obvious thing that will affect the price; ‘bigger might be better’, but it will come with a heftier price tag. In addition, a very large or tall outdoor building may require planning permission; expect an application fee to be in the region of £200. Size also affects labour costs, material requirements, such as ground screws and even glue, and if, for example, you choose to paint your garden room, this will cost more to touch up. If you are looking for a huge garden building, this may require additional support, both on the ground and in the structure, meaning a price tag on extra steel.


Whether you intend to create a playroom, an office, or a full-blown annexe, you will undoubtedly want an electricity supply when creating a truly functional space. Many garden room uses will also benefit from an internet connection. Depending on the location of the central consumer unit, the time taken to connect your garden room to a power supply can fluctuate. We all know time means money; it will take an electrician longer to connect these supplies and install a dedicated fuse box. In addition, providing the requested number of downlights, power sockets, and other electrical items will affect the total cost of the garden room.

Water Supply

Does your annexe require a kitchen, or perhaps your playroom or office will need a toilet? Even a hot tub building might need a shower to rinse off in. This is another example of another item that will increase the time taken to build the garden room. You will also need to include pipes to carry the wastewater from the garden building and potentially a sewage pump depending on your area.


With the cost of timber skyrocketing, this may not be the most cost-effective material to choose for the external cladding of your garden room. Of course, the choice you make affects the finished garden building appearance, but cheaper options can look just as beautiful as the more expensive ones.


Whether you decide on a flat roof or a pitched one will affect the overall cost. A pitched roof is more challenging and therefore be more expensive. Another choice could be a green roof; however, this might require additional reinforcement in the roof and thus carry a cost implication.

Other Extras

If you’re creating an annexe, you might want a working television there, which might mean contacting your existing provider to install another unit in the garden room. They will likely charge for installation and a monthly fee for this luxury. Other extras such as solar panels may save you money in the long term; however, there will be an initial cost implication for the purchase and installation. If a bespoke design with angles that don’t meet at 90 degrees is something you’ve always longed for, remember this will also increase the total cost of the garden room.

Whatever your dream garden building, contact us to help make your dreams come true!

Ben Feldman, Owner of Spacecraft Garden Rooms
Ben Feldman

"All of our garden rooms are hand built in our workshop in Dover by a small team of qualified designers and craftspeople. We do not mass produce our garden rooms but take pride and joy in making them as beautiful, and with as much attention to detail, as as we can."

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