Energy-Efficient Eco Granny Annexes

Introducing a fresh approach to providing customised living spaces that can be used throughout the year.

Bespoke Garden Annex Manufacturer

At Outerspace Group we have carved a niche as a distinguished bespoke annex manufacturer, setting the industry standard for personalised and premium annex solutions. With a relentless commitment to excellence, we offer an array of meticulously crafted annexes, tailored to meet the exacting needs and preferences of our clients. Our expertise extends across a diverse range of annex types, from elegant garden annexes that seamlessly blend with the natural surroundings to sophisticated home office annexes designed for optimal functionality and aesthetics.
SIP Logos

Independent Granny Annexe Living Solutions

OuterSpace Group has established itself as the leading supplier of annex materials in the UK.

Our Granny annexe SIP building kits offer a permanent solution for multi-generational living on the same property. With excellent insulation they provide an ideal option for elderly parents to be nearby, while still maintaining their own separate space. These building kits also serve as a great solution for accommodating overnight guests or creating a fun and secure environment for young adults to experience independent living.

Made With SIPs

All of our garden annex kits are made from Structural Insulated Panels which we manufacture by injecting highly insulated Polyurethane between two sheets of structural OSB3. The panels form the floor, walls and roof creating an incredibly rigid, highly insulated passive standard structure.

Become a Trade Partner

If you’d like more information on our annex buildings or services get in touch today.

Unlock the Benefits

Building Benefits

Speed of Build

Speed of Build

SIP building kits are typically 50% faster than alternative building methods meaning you can complete more projects every month and increase your profits.
Eco Friendly

Eco Friendly

Our entire range of buildings are designed to produce minimal waste and made in our green energy powered factory.
Low Maintenance

Low Maintenance

Quality materials are used to ensure longevity and usage for many years to come with minimal maintenance required.
Highly Insulated

Highly Insulated

Habitable all year round. Our buildings are highly insulated making them energy efficient.
Soundproof

Soundproof

Our structural insulated panels (SIPs) function extremely well in achieving soundproofing.

Find Out More

If you’d like more information on our annex buildings or services use our contact form below to get in touch.