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Using our configurator you can design your perfect garden office with minimal effort, ensuring it’s tailored to your own personal preferences and specifications.

Use our online configurator to choose any options or additions you want for your Garden Studio. Any options or additions are payable directly to Garden Studio. Contact the team on 01296 328260 or email costco@gardenstudio.co.uk who will be happy to help with your project.

You can get a great idea of how your new garden office will look by using the 360 degree rotating viewer.

Also compatible with mobile and tablet devices

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Exclusive To Costco Members

Basebox garden rooms by Green Retreats are available in a range of sizes and finishes. Each building is individually crafted at our Buckinghamshire factory by our specially trained staff to your chosen specification.

Contact the team on 01296 328260 or email costco@greenretreats.co.uk who will be happy to help with your project.

Basebox: The most cost-effective quality garden room in the market. Working exclusively with Costco to offer their members an exclusive 10% discount.

Costco Member Benefits

Costco Special Order

10% Off

Exclusive to Costco Members

Costco - Executive Member

Receive an extra 2% reward (ex VAT)

when using your Executive membership card

What Our Customers Say

We are highly rated on Trust Pilot by our customers

The Latest Garden Rooms By Green Retreats

Basebox is the latest garden room design from Green Retreats, and takes over from Garden Studio as our most cost-effective quality garden room.

Garden Studio is now discontinued to make space for this new Basebox design which offers better value for money vs quality using the latest in innovative materials.

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Let's create your 

Use our 3D configurator to design your space

How to order your Basebox:

Step 1 - Visit the Costco website and select the building size you’re looking for

Step 2 - Fill out your details on the website to place your order

Step 3 - Contact us on 01296 328260 or costco@greenretreats.co.uk at your earliest convenience to confirm your order and to discuss any additions, delivery and your installation date

Get Started

From £8,799.99

Basebox is made with high-quality, value-engineered materials that offer a combination of luxury with cost-effectiveness for the perfect garden room solution suitable for any home.

Basebox's versatility makes it the ideal 'blank canvas' for your garden, allowing you to create a space perfectly tailored to your needs. Whether you need an office, gym or lounge, Basebox gives you the space to expand your home.


With 10 different size configurations available, Basebox can accommodate any garden size. So, whether you need a cosy 2.4m x 2.4m garden office or a spacious 4.8m x 3.8 garden gym, Basebox covers your needs.

Ex. VAT Price
Inc. VAT Price
Costco Item No.
2.4m 3.0m 3.6m 4.2m 4.8m
£8,799.99 Ex VAT
| £10.599.99 Inc VAT
| Item: 449280
£9,899.99 Ex VAT
| £11,879.99 Inc VAT
| Item: 449278
£10,499.99 Ex VAT
| £12,599.99 Inc VAT
| Item: 449279
£11,899.99 Ex VAT
| £14,279.99 Inc VAT
| Item: 461209
£12,499.99 Ex VAT
| £14,999.99 Inc VAT
| Item: 461212
£9,999.99 Ex VAT
| £11,999.99 Inc VAT
| Item: 449276
£11,499.99 Ex VAT
| £13,799.99 Inc VAT
| Item: 449277
£12,499.99 Ex VAT
| £14,999.99 Inc VAT
| Item: 449275
£13,999.99 Ex VAT
| £16,799.99 Inc VAT
| Item: 449273
£14,999.99 Ex VAT
| £17,999.99 Inc VAT
| Item: 449272

your space to…

… live, create, design, discover, build, relax, exercise, draw, invent, work, inspire, listen, dream, express, collaborate, escape, plan, play, watch, forget, entertain, paint, doodle…

Our Features

Delivery Is Included In Band 1

Delivery is calculated on distance from our factory and showroom located in HP18 0XB. Where we can, we include delivery within the cost of your building. Please see the map below for delivery charges.

  • Product Enquiry

    How Can We Help?

    Let us know your question below and a member of our team will get back to you as soon as possible to help you further.

Our Showrooms

See our new Basebox building for yourself by visiting our Bucks showroom! With 17 buildings on display in our indoor and outdoor showroom, visit us to see the quality of our garden rooms.

Our Showrooms




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Building Measurements

You can get a great idea of how your new garden office will look by using the 360 degree rotating viewer.

Also compatible with mobile and tablet devices


Design Your Building

Start designing your garden room today using our online Visualiser tool. You’ll be able to choose your style, size, finishes and get an accurate cost.

Design Your Building