If you’re thinking of building an outbuilding in your garden or grounds, it’s almost certain to be a good investment. Each of our garden rooms are designed specifically for you, which means that the exact cost of building a granny annexe will vary depending on your specifications, but whatever the quote, you can be sure it’ll boost the value of your home and provide a great return on investment.


Here at Green Studios, all of our garden rooms are designed bespoke for individual clients, but we can still give you an idea of the typical cost of building a granny annexe.

A compact garden studio (5.39m x 3.49m) featuring an open plan living room / bedroom, with a foldaway wall-bed frame and cabinet would cost £46,250.

A one-bedroom granny annexe with separate bathroom from our garden pod range might set you back £52,150.

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If you require an extra bedroom, the example price for a large, two-bedroom garden lodge with a full-size bathroom and central living area is £114,195.

Because every garden room is different, we will design your granny annexe with your specific needs in mind – ask us about accessibility features like ramped access, sit down showers, grab rails and more.

The size of your intended granny annexe, different building materials, designer features and any extra fixtures and fittings can all affect the price we quote – see our Pricing page to understand more about the costs involved.

Adding value to your home

If you’re planning on selling your property in the foreseeable future, the cost of building a granny annexe in your garden can be offset by the value that it is likely to add to your home.

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In most areas, homeowners can expect to regain at least 75% of the cost of installation in the increased value of their property. In some property hotspots, your return on investment could even reach 100% or more! In addition to boosting the value of your home, adding a garden room also increases saleability, making your property more likely to be snapped up quickly by eager buyers.


Once you’ve met the cost of building a granny annexe, you’ll be pleasantly surprised at how little it requires in terms of maintenance and running costs. Manufactured using high quality, well-insulated materials, all of our garden rooms make cosy draught-free retreats, so your heating bills will be low. We use eco-friendly LED lights, which are economical to run. And all of our garden studios are also robust and durable, with minimal maintenance required for their expected 50 year lifespan.


At Green Studios, we believe we can offer the best value garden studios on the market. That’s why we’re proud to match any quote you receive ‘like for like’, so you can be sure you’re getting a good price.

If you’re interested in discovering the cost of building a granny annexe in your garden, just contact us today for a free consultation.