About us
Greg has 15 years’ client-side value-add asset management experience across various private equity platforms, managing cross-sector direct equity portfolios, ranging from £200m to £500m, in the UK and Europe.
Greg has embarked on a career change to launch hollen+, focusing on reducing the environmental impact of real estate whilst maximising returns.
Combining a passion for sustainability with strong experience in value-add asset management, Greg is focused on driving value through finding and recommending the most commercially attractive solutions to upgrade buildings to EPC B (or higher), deliver ESG improvements, and formulate viable solutions for the transition to net zero.
Greg likes to get under the skin of any building before making recommendations on how to improve it. This allows for considered, tailored advice once the asset is fully understood, with the specific aim of trying to deliver an exciting USP for any given building. This has yielded excellent recent results.
James is an experienced chartered surveyor, specialising in project and development management. He founded hollen in January 2020 and co-founded hollen+ in 2023.
James worked at Edward Symmons (now Lambert Smith Hampton) and Tuffin Ferraby Taylor, before joining Bollingbrook in 2012 where he became a director.
Bollingbrook was acquired by Colliers in 2016, following which James remained a director and led a team within the Project and Building Consultancy division.
James has extensive experience working on complex redevelopment and refurbishment projects, delivering schemes with exceptional ESG credentials whilst ensuring solutions are flexible, sustainable and technically-optimised to keep ahead of market expectation; working practices and occupation trends.
His track record includes leading projects at each stage of the development lifecycle, from inception through to completion and beyond. His experience spans offices, hotels, recording studios, conference, education, residential and restaurants for owners, investors and occupiers, including turnkey delivery.
Recent feasibility studies have included office, hotel and mixed-use schemes in Central London, including optioneering in relation to design, use classes and massing; financial appraisal; and cost, risk and programme analysis.
Andy is a sustainability consultant working to create sustainable buildings and promote ethical business practices. With a focus on environmental design, his expertise spans M&E engineering, sustainability certification, dynamic simulation modelling, air quality, acoustics and daylight analysis. Andy is a low carbon consultant (LCC), low carbon energy assessor (LCEA) and BREEAM accredited professional (AP).
Through thermal comfort and energy modelling, we help teams understand the nuanced interplay between design, comfort and sustainability. These models unveil insights into operational energy consumption and embodied carbon, empowering informed decisions that cost-effectively shape greener buildings and a healthier environment, with occupant comfort a key design consideration.
Andy is also the founder of Shade the UK, a community interest company that focuses on adapting the built environment and public spaces to offer protection to vulnerable people in the face of a changing climate.
