Mercia Insulated Garden Rooms

Whether you need a home office or a place to relax, Mercia has a range of insulated garden rooms suitable for year-round use which make them an economic alternative to an extension. Choose from a wide selection of sizes all with assembly included.

  • display as griddisplay as grid
  • display as listdisplay as list
  • view all

Although it is the smallest size available, the 10 x 10 Mercia Insulated Garden Room will add plenty of new usable space to your garden. A recreation room, a home office, a home gym or even a guest or spare bedroom, you can take advantage of this spacious garden building all year round. The key features include:

  • 72mm thick, double-clad walls fitted with innovative and effective “EcoQuilt” insulation
  • Long-lasting EPDM rubber roof and 14mm double glazed windows provide excellent protection from the elements
  • Installation is included free of charge as part of the price of your Garden Room
ONLY£8,849.99  

Free Delivery*
35 Working Days.

The 14 x 10 Mercia Insulated Garden Room is a versatile, contemporary garden building that will add plenty of flexible living space to your garden. Whether you would like a recreation room, a home office, a home gym or even a guest or spare bedroom, this spacious garden building can be used in comfort all year round thanks to its insulated design. The key features include:

  • 72mm thick, double-clad walls fitted with innovative and effective “EcoQuilt” insulation
  • Long-lasting EPDM rubber roof and 14mm double glazed windows provide excellent protection from the elements
  • Installation is included free of charge as part of the price of your Garden Room
ONLY£9,299.99  

Free Delivery*
35 Working Days.


The 10 x 14 Mercia Insulated Garden Room is a versatile, contemporary garden building that will add plenty of flexible living space to your garden. Whether you would like a recreation room, a home office, a home gym or even a guest or spare bedroom, this spacious garden building can be used in comfort all year round thanks to its insulated design. The key features include:

  • 72mm thick, double-clad walls fitted with innovative and effective “EcoQuilt” insulation
  • Long-lasting EPDM rubber roof and 14mm double glazed windows provide excellent protection from the elements
  • Installation is included free of charge as part of the price of your Garden Room
ONLY£9,399.99  

Free Delivery*
35 Working Days.

Offering loads of usable interior space, the 17 x 10 Mercia Insulated Garden Room could provide you with a valuable new room for your home if a traditional extension isn’t and option. A recreation room, a home office, a home gym or even a guest or spare bedroom, you can take advantage of this spacious garden building all year round. The key features include:

  • 72mm thick, double-clad walls fitted with innovative and effective “EcoQuilt” insulation
  • Long-lasting EPDM rubber roof and 14mm double glazed windows provide excellent protection from the elements
  • Installation is included free of charge as part of the price of your Garden Room
ONLY£10,999.99  

Free Delivery*
35 Working Days.


With plentiful space inside, the Mercia 14 x 14 Insulated Garden Room is the perfect purchase for anyone in need of a valuable and cost-effective extension to their homes. A recreation room, a home office, a home gym or even a guest or spare bedroom, you can take advantage of this spacious garden building all year round. The key features include:

  • 72mm thick, double-clad walls fitted with innovative and effective “EcoQuilt” insulation
  • Long-lasting EPDM rubber roof and 14mm double glazed windows provide excellent protection from the elements
  • Installation is included free of charge as part of the price of your Garden Room
ONLY£10,999.99  

Free Delivery*
35 Working Days.

The 3 x 4m Mercia Cresswell Insulated Garden Room is perfect for a garden office, guest space, or peaceful outdoor escape. Made with 100mm thick double-skinned walls containing Eco-quilt multi-foil insulation, it’s made for all-year use. The key features include:

  • Free Home Installation

  • 14mm double-glazed with 1 top opening and 2 fixed windows

  • EcoQuilt insulated walls and roof

  • Air Tec Insulated floor

  • Customisable design

  • 16mm Tongue and groove floor

  • Solid Sheet Board & Interlocking Tongue and Groove Roof

  • 10-year anti-rot guarantee

ONLY£11,199.99  

Free Delivery*
35 Working Days.

TOP OFFERS

Shop Now

The 4 x 3m Cresswell Insulated Garden Room with Veranda is made with 100mm thick double-skinned walls containing Eco-quilt multi-foil insulation. It’s made for all-year use, perfect for a garden office, guest space, or peaceful outdoor escape. The key features include:

  • Free Home Installation

  • 14mm double glazed windows with 2 top opening windows and 2 fixed windows

  • EcoQuilt insulated walls and roof

  • Air Tec Insulated floor

  • Customisable design

  • 16mm Tongue and groove floor

  • 10-year anti-rot guarantee

ONLY£11,499.99  

Free Delivery*
35 Working Days.

Looking for a practical and cost effective way to expand on the usable living space in your home without moving house or building a traditional extension? Then the 20 x 10 Mercia Insulated Garden Room could be the perfect solution. A recreation room, a home office, a home gym or even a guest or spare bedroom, you can take advantage of this spacious garden building all year round. The key features include:

  • 72mm thick, double-clad walls fitted with innovative and effective “EcoQuilt” insulation
  • Long-lasting EPDM rubber roof and 14mm double glazed windows provide excellent protection from the elements
  • Installation is included free of charge as part of the price of your Garden Room
ONLY£11,999.99  

Free Delivery*
35 Working Days.


Looking for a practical and cost effective way to expand on the usable living space in your home without moving house or constructing a traditional extension? Then the 17 x 14 Mercia Insulated Garden Room could be the perfect solution. A recreation room, a home office, a home gym or even a guest or spare bedroom, you can take advantage of this spacious garden building all year round. The key features include:

  • 72mm thick, double-clad walls fitted with innovative and effective “EcoQuilt” insulation
  • Long-lasting EPDM rubber roof and 14mm double glazed windows provide excellent protection from the elements
  • Installation is included free of charge as part of the price of your Garden Room
ONLY£12,699.99  

Free Delivery*
35 Working Days.

The largest size available, the 20 x 14 Mercia Insulated Garden Room will add so much extra usable space to your home that you’ll have a hard time deciding what to do with it! A recreation room, a home office, a home gym or even a guest or spare bedroom, you can take advantage of this spacious garden building all year round. The key features include:

  • 72mm thick, double-clad walls fitted with innovative and effective “EcoQuilt” insulation
  • Long-lasting EPDM rubber roof and 14mm double glazed windows provide excellent protection from the elements
  • Installation is included free of charge as part of the price of your Garden Room
ONLY£12,999.99  

Free Delivery*
35 Working Days.


The 5m x 3m Cresswell Insulated Garden Room is for all-year use. It’s constructed with 100mm thick double-skinned walls containing Eco-quilt multi-foil insulation. Use it as a garden office, guest space, or outdoor eating area. The key features include:

  • Free Home Installation

  • Customisable design

  • Double glazed windows

  • EcoQuilt insulated walls and roof

  • Air Tec Insulated floor

  • 16mm Tongue and groove floor

  • Solid Sheet Board & Interlocking Tongue and Groove Roof

  • 10-year anti-rot guarantee

ONLY£13,399.99  

Free Delivery*
35 Working Days.

The 4m x 4m Edwinstone Insulated Garden Room is fit for use all-year round made with 100mm thick double skinned walls containing EcoQuilt multi-foil insulation. This is a perfect space to set up your garden office, guest space, or peaceful outdoor escape. The key features include:

  • Free Home Installation
  • 14mm double glazed with 2 fixed and 2 top opening windows
  • EcoQuilt insulated walls
  • EcoQuilt multi-foil insulation and 16mm Interlocking Tongue and Groove Roof
  • Customisable design
  • Air Tec Insulated floor
  • 10-year anti-rot guarantee
ONLY£13,499.99  

Free Delivery*
35 Working Days.


The 6m x 3m Mercia Cresswell Insulated Garden Room features 100mm thick double-skinned walls containing Eco-quilt multi-foil insulation. It is perfect for all-year use as a garden office, guest space, or garden gym. The key features include:

  • Free Home Installation

  • 14mm Double glazed with 2 top opening windows and 2 fixed windows

  • EcoQuilt insulated walls and roof

  • Air Tec Insulated floor

  • Customisable design

  • Solid Sheet Board & Interlocking Tongue and Groove Roof

  • 16mm Tongue and groove floor

  • 10-year anti-rot guarantee

ONLY£14,599.99  

Free Delivery*
35 Working Days.

The 5m x 4m Cresswell Insulated Garden Room is for all-year use. It’s constructed with 100mm thick double-skinned walls containing Eco-quilt multi-foil insulation. Use it as a garden office, guest space, or outdoor eating area. The key features include:

  • Free Home Installation

  • Customisable design

  • Double glazed windows

  • EcoQuilt insulated walls and roof

  • Air Tec Insulated floor

  • 16mm Tongue and groove floor

  • Solid Sheet Board & Interlocking Tongue and Groove Roof

  • 10-year anti-rot guarantee

ONLY£14,999.99  

Free Delivery*
35 Working Days.


The 6m x 4m Cresswell Insulated Garden Room is perfect for all-year use. It is made with 100mm thick double-skinned walls containing Eco-quilt multi-foil insulation. You can use it as a garden office, guest space, or covered eating area. The key features include:

  • Free Home Installation
  • Customisable design
  • Air Tec Insulated floor
  • EcoQuilt insulated walls and roof
  • 14mm Double glazed with 2 top opening windows and 2 fixed windows
  • 16mm Tongue and groove floor
  • Solid Sheet Board & Interlocking Tongue and Groove Roof
  • 10-year anti-rot guarantee
ONLY£16,399.99  

Free Delivery*
35 Working Days.