Proteus Waterproofing Ltd

Proteus Waterproofing successfully delivered a complex, multi-system cold-applied waterproofing solution for one of London’s most iconic landmarks – Marylebone House – as part of the £25 million redevelopment of the former Arcadia Group headquarters. This historic site has now been transformed into over 75,000m² of sustainable, wellness-focused office space, complete with landscaped terraces, blue roof attenuation systems and extensive green roofing.

Proteus played a vital design-and-delivery role from the beginning – developing bespoke build-ups for multiple roof levels, integrating stormwater management and solving complex thermal and aesthetic challenges across the main building and its new mews extension. The result is a significant refurbishment that exceeds modern performance targets while retaining the architectural heritage of this famous Marylebone landmark.

The multi-million development incorporated spacious new terraces, three additional storeys and a brand-new mews building replacing a defunct 1960s car park, all of which demanded high quality aesthetics, performance and sustainability. This required roofing and waterproofing systems that could adapt to diverse structural configurations, meet exacting thermal targets and incorporate both blue and green roof technologies. The result is a visually striking building with enhanced biodiversity and energy efficiency, offering panoramic views and richly landscaped rooftop environments.

The transformation of Marylebone House and the adjacent Mews Building has set a new benchmark for urban refurbishment and sustainable design. With Proteus Waterproofing’s strategic input and precision execution, this ambitious project exceeded both client and environmental expectations.

From cold-applied waterproofing to biodiversity-driven green roofs, Proteus demonstrated their technical leadership and commitment to greener, safer, more resilient buildings. Their work at Marylebone House is a great example of how innovation in waterproofing can directly contribute to climate-positive construction.