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Garden room project · Cosy Garden Rooms

A garden playroom will evolve with the kids

A 5m × 4m garden playroom in Greater Manchester with bi-fold doors and wipe-clean finishes, built in three days for £25,000 and with room for a sauna too.


Published 29 July 2024 · Updated 24 October 2026 · 3 minute read · Written by The Garden Room & Annexe Guide

The grooved walls are easy to keep clean
Inside  grooved walls, easy to wipe clean

Creating a space where young children can safely play and store all their toys can be a challenge for any family. A garden room playroom offers a delightful solution, blending the joy of indoor play with the benefits of being outdoors. This unique setup not only provides a dedicated area for children to enjoy their toys but also fosters a seamless connection with the garden, encouraging an indoor-outdoor childhood that is nurturing, enriching, and memorable.

A high-quality, fully insulated garden room is an investment that evolves with the family. As the children grow, this versatile space can transform from a fun playroom into a homework room, a teenagers’ den, or even a music room. The adaptability of a garden room ensures it remains a valuable and functional part of the home for years to come.

This recent project by Cosy Garden Rooms is an excellent example of a garden room playroom. Built in Greater Manchester, the 5m x 4m building was installed and ready to use in just three days on-site. The project cost £25,000, including the foundation and the final electrical connection to the house.

The bi-fold doors can be pushed to one side for indoor-outdoor play
Bi-fold doors  pushed back for play

At a glance

  • Size: 5m × 4m.
  • Built for: Two young children's playroom, with space that can change as they grow.
  • Cost: £25,000 including the foundation and electrical connection.
  • Finishes: Light Mist HardiePlank® with Anthracite Grey uPVC, a 600mm canopy; painted grooved walls inside.
  • Company: Cosy Garden Rooms, three days on site.

Part of our garden family room guide →

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The brief

Extending the downstairs space

The clients live in a three-story townhouse and, with two young children, wanted to create a dedicated playroom for them. The downstairs floor plan of their house didn’t offer the space to create a playroom, and they didn’t want the hassle and expense of moving house or the disruption of building a house extension. Instead, they turned to the space in their garden.

After thoroughly researching their options, they chose to work with Cosy Garden Rooms, who could fulfil their brief of creating a quality garden room finished externally with low-maintenance materials. Inside, they wanted a space that could incorporate plenty of toy storage and leave ample space for playing. They were also looking for interior finishes that could easily be wiped clean.

The building

5m x 4m garden room

Following the design process, where Cosy Garden Rooms take time to understand what each client is looking to achieve, they designed a 5m x 4m building clad externally in HardiePlank® cladding, a cement fibre board that requires little maintenance. It is a robust, dimensionally stable board that is coloured during the manufacturing process. HardiePlank® has a long lifespan and does not require painting to maintain its appearance. The Light Mist colour was chosen, which, when paired with Anthracite Grey uPVC doors, windows, and trims, creates a smart, modern look.

The Cosy Garden Room has a 600mm roof canopy with LED recessed lighting
Cosy Garden Rooms  5m by 4m garden playroom

Bi-fold doors were chosen for the front elevation. These doors can be pushed to one side, allowing play to spill out into the garden. A narrow rectangular window has been positioned high in the right-hand wall, allowing for easy ventilation in the room.

A 600mm deep roof canopy has been fitted with exterior LED downlights, which cast an attractive light along the front of the building.

The Light Mist Hardie Plank pairs well with Anthracite Grey doors and windows
Light Mist HardiePlank®  with Anthracite Grey

Inside, the grooved wall panels have been painted white and mixed with light grey laminate flooring. Both finishes are perfect for a playroom as they are durable and easy to clean.

The children

A room of their own

Adding a dedicated playroom has been a great success for the family. The children are enjoying the dedicated play area and the connection with the garden. We hear that they are quite houseproud, keeping the toys in the playroom much tidier than when in the house! It’s also a place where they can display their trophies and artwork.

The adults

Space for the adults too

The 5m x 4m footprint has created enough space for the adults to claim some space too. They have installed a sauna in one corner, without it dominating the space. This combination of uses proves how versatile garden room buildings can be.

Inside there is plenty of room for play and a sauna too
Play and a sauna
Planning something similar?

Learn more about Cosy Garden Rooms

To learn more about creating a garden playroom, chat with the Cosy Garden Rooms team on 0115 77 22 715 or by emailing info@cosygardenrooms.co.uk. Explore www.cosygardenrooms.co.uk to see more of their work.

Visit Cosy Garden Rooms More Cosy Garden Rooms projects
More projects like this Garden family rooms Garden rooms with a canopy 20–30sqm garden rooms
Read the guides What garden rooms cost Permitted development Buying a garden gym

Published 29 July 2024 · Photographs courtesy of Cosy Garden Rooms.

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