The Green Building Store – Now 21 Degrees: Your Guide to High-Performance Eco Building Solutions in the UK

The green building store has been a pioneer in sustainable building materials and eco-friendly construction solutions across the UK. Over the years, it has built a strong reputation for supplying high-performance windows, doors, and mechanical ventilation systems that enhance energy efficiency. Its recent rebrand to 21 Degrees reflects a renewed focus on innovation while continuing to support low-energy homes, Passivhaus projects, and sustainable building initiatives.
By prioritising environmentally responsible materials, the green building store enables homeowners, architects, and builders to reduce energy consumption and carbon footprints. Its solutions go beyond simply supplying products, offering guidance, technical expertise, and tailored advice for achieving optimal comfort, efficiency, and sustainability. This makes it a key partner for any UK construction project aiming to meet modern eco standards.
About The Green Building Store and Its Evolution
The green building store was founded over 25 years ago with a vision to provide sustainable building products for eco-conscious homeowners and builders. From humble beginnings, it has become a recognised authority in the UK for Passivhaus and low-energy construction materials. The company’s long-standing dedication to quality and sustainability has helped it develop products that balance energy efficiency, durability, and design aesthetics.
With the rebrand to 21 Degrees, the green building store continues to uphold its core principles while presenting a modernised identity. The rebrand signifies a shift toward a broader vision of eco-building solutions while retaining the technical expertise and customer trust that has defined the company. UK homeowners and builders can still rely on the green building store for cutting-edge sustainable construction solutions.
Products and Services Offered by The Green Building Store
The green building store offers a wide range of products designed to improve energy efficiency and sustainability in homes. High-performance triple-glazed timber windows are among its flagship offerings, providing excellent insulation, reducing heat loss, and improving comfort. Its doors are built to Part M compliance and are customisable, ensuring accessibility and functionality without compromising on eco-friendly standards.
In addition to windows and doors, the green building store supplies mechanical ventilation with heat recovery (MVHR) systems. These systems maintain a healthy indoor environment by circulating fresh air while recovering heat from outgoing air, reducing energy consumption. The green building store also provides expert guidance for low-energy and Passivhaus projects, helping UK builders and homeowners implement best practices for sustainable construction.
Why The Green Building Store is a Trusted Choice

The green building store has earned a strong reputation in the UK by combining expertise, quality products, and sustainable practices. Its technical knowledge allows homeowners and builders to make informed decisions about energy-efficient building materials and construction strategies. Each project is supported with guidance on optimising thermal performance, airtightness, and long-term sustainability, ensuring that clients achieve their environmental and efficiency goals.
Customer satisfaction is a hallmark of the green building store’s approach. Case studies and testimonials highlight its ability to deliver reliable, high-quality solutions that reduce energy costs while enhancing comfort. Its products are designed to meet rigorous UK building standards, making the green building store a go-to provider for those seeking trusted eco-friendly building materials.
Rebranding to 21 Degrees and Its Significance
The green building store’s transformation into 21 Degrees represents a strategic rebrand to align with modern sustainability goals. While the name has changed, the company’s dedication to providing high-performance, energy-efficient, and environmentally responsible solutions remains the same. This evolution reflects a commitment to staying at the forefront of sustainable construction in the UK.
For existing and new clients, the rebrand signals a fresh approach while retaining the core values that made the green building store successful. 21 Degrees continues to offer the same technical support, quality products, and expertise for low-energy homes, making it an even stronger choice for architects, builders, and homeowners looking to create environmentally responsible buildings.
Tips for Eco-Friendly Building with The Green Building Store
When working with the green building store, selecting the right combination of windows, doors, and ventilation systems is crucial. High-performance triple-glazed timber windows paired with MVHR systems provide the most efficient energy savings for both new builds and retrofits. Attention to insulation and airtight construction further enhances the eco-friendly performance of homes.
The green building store also recommends integrating Passivhaus principles, including optimal building orientation, airtightness, and minimal thermal bridging. Using sustainable materials and following best practices in construction ensures that UK homeowners can reduce energy consumption, lower carbon footprints, and enjoy a more comfortable living environment. These strategies are key to achieving long-lasting, eco-friendly results.
Conclusion
The green building store, now 21 Degrees, remains a leading provider of high-performance eco building solutions in the UK. Its range of sustainable products, including windows, doors, and MVHR systems, combined with expert support, allows homeowners and builders to create energy-efficient, low-carbon buildings. Choosing the green building store means prioritising both sustainability and quality.
By adopting solutions from the green building store, UK homeowners can enjoy improved comfort, reduced energy bills, and environmentally responsible construction. Whether undertaking a new build or retrofitting an existing property, the green building store provides the knowledge, materials, and guidance necessary to achieve a greener, more efficient home.





