Modular Garden Rooms for all Outdoor Spaces
A garden annexe is a big decision, and knowing the cost upfront helps you plan with confidence.
It’s a big investment, so it’s important to understand what you’re getting for your money.
At The Green Room, we build fully insulated, permanent buildings using SIPs panels, connected to mains services, and finished to a high standard. Our pricing includes everything from the foundations to the kitchen appliances.
For a small garden annexe with an en-suite, prices start from around £52,000*. These are ideal as guest spaces or for single-person use.
If you’re looking for something more like a home in your garden, with a lounge, kitchen, bathroom and bedroom, costs start from £85,000 for a 32m² annexe.
This includes full internal fit-out and connection to all services. You can see more on our Granny Annexe or Garden Lodges page
*Based on a standard 18m² guest room with en-suite. Prices correct at time of writing.
All of our annexes and lodges are turnkey, which means the price covers everything. There are no hidden extras. Your quote will include:
For more information, visit our Granny annexe installation page.
The total price can vary depending on a few things:
We’ll guide you through all of this during your design consultation. Every garden room is unique and made to suit the space and needs of the family.
Most people don’t just see this as a cost. It’s a long-term solution for keeping family close, improving independence and making the most of outdoor space. A well-built granny annexe can also add between 5–15% to the value of your home.
Our team of down-to-earth experts genuinely care about great garden spaces and excellent customer service. Whether you’re just starting to explore your options or ready to move forward with your project, we’re here to help.