Planning Consent Achieved for 1 Marylebone High Street

We're pleased to confirm that planning consent has been secured for the refurbishment and extension of 1 Marylebone High Street—a landmark scheme and our most sustainable development to date.

Aerial view of 1 Marylebone High Street

A Sustainable Future in the Heart of London

Located in the heart of the Harley Street Conservation Area, this project merges heritage-led design with high-performance environmental upgrades. The collaboration with The Howard de Walden Estate ensures that we retain and adapt the existing structure. This approach delivers flexible workspaces that are future-proofed and enhances local biodiversity.

The development targets BREEAM Excellent, NABERS 4.5 Stars, and a LETI A-rated embodied carbon benchmark. These certifications reflect our commitment to sustainability.

Key Environmental Features

Retention of the Existing Structure

One of our key achievements is the retention of the existing superstructure and foundations. This effort preserves about 50% of the building’s upfront embodied carbon. This strategy not only benefits the environment but also pays homage to the history of the building.

Fabric-First Enhancements

We are implementing fabric-first enhancements to meet LETI thermal performance targets. These improvements focus on the building's existing materials, optimizing energy efficiency while maintaining the architectural integrity.

All-Electric HVAC System

Our all-electric HVAC system is designed for operational energy performance targeting 91 kWh/m²/yr. This marks a 58% improvement compared to traditional systems. The shift to an all-electric system minimizes carbon emissions and promotes the use of renewable energy.

Material Reuse and Lightweight Construction

Where possible, we will reuse materials to reduce waste. The new extensions will incorporate lightweight and disassemblable construction techniques. This innovative approach aligns with our sustainability goals.

Biodiverse Rooftop and Green Spaces

The project will feature biodiverse rooftop planting and create nesting habitats. This initiative is part of a comprehensive biophilic design strategy aimed at integrating nature into urban living. The rooftop garden will serve not only as a beautiful amenity but also as a vital living space for local wildlife.

Enhancing Accessibility and Community Space

The design interventions will include a more visible and accessible entrance. Additionally, we are planning rear and rooftop extensions to create inviting communal spaces. The rooftop pavilion and garden are particularly noteworthy. They will transform underused areas into vibrant green spaces for social interactions and community gatherings.

Preserving Heritage While Promoting Innovation

The result of this project is an approach that respects the building’s Edwardian character. At the same time, it sets a clear path for low-carbon retrofit in Westminster’s historic core. Our commitment to sustainability is evident in every aspect of the development.

As we move forward with the project, we remain dedicated to creating a space that not only meets modern needs but also contributes positively to the local environment.

In conclusion, the refurbishment and extension of 1 Marylebone High Street stands as a benchmark for sustainable architecture. We are excited to embark on this journey, knowing that it will set a standard for future developments in London.

For more information on sustainable architecture, feel free to check out our website.

By prioritizing sustainability and community, this project will help shape a greener future. Let's work together towards a more efficient and eco-friendly urban environment.

Read more about the project here