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Our reputation for delivering high quality design, securing planning permission and providing technical expertise is first class, enabling us to build strong and lasting relationships with our clients. We work with a diverse range of businesses and individuals across the whole of Yorkshire and the North East. Our offices are based in the centre of York. Mass Architecture has won multiple Design Awards for their work in London and Yorkshire.

Mass Architecture’s clients receive an exceptional service delivered by our highly experienced and committed team of architects.

Mass Architecture is an RIBA Chartered Practice and has been a member of the 
Government pre-qualification body ‘Constructionline’ since 2007.

Our team

Charlotte Harrison

BA(Hons), PG Dip Arch(UCL), MA(UCL), RIBA


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Charlotte is a founding partner of mass architecture. Graduating from The Bartlett School of Architecture (UCL) in 1999, she qualified as an architect in 2002. With 20 years of experience in private practice, Charlotte has expertise in the design and refurbishment of buildings and interiors for the commercial, community and residential sectors.

Charlotte co-organised an international festival of architecture in Leeds in 1996 before joining Allford Hall Monaghan Morris Architects in 1999, where she ran projects for Shelter and the Barbican Arts Centre.

From 2004-2010 Charlotte was engaged part-time as a design tutor and lecturer at Universities in London, Leeds and Sheffield.

From 2009 onwards Charlotte has been a panel member of the Yorkshire and Humber Design Review Panel.

Charlotte has been a Royal Academy exhibitor in the Architectural Drawing category, and has won design Awards in both London and York.

Charlotte is Co-President of the York Architectural Association (RIBA) and sits on the Regional Council of the RIBA.

Charlotte is a Freeman of the City of York and London.

Glen McGowan

BA(Hons), PG Dip Arch(UEL), MA(Dist), RIBA


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Glen McGowan is a founding partner of Mass Architecture. Glen specialises in working with historic buildings and monuments and has completed a Masters in Conservation Studies (Historic Buildings) at The University of York. He works with clients from the commercial, ecclesiastical and community sectors, as well as with private clients.

He began his career as a carpenter, before commencing his architectural education at Westminster University.

Prior to founding mass architecture in 2004, Glen worked for MacCormac Jamieson Prichard Architects on a number of prestigious projects including the BBC Broadcasting House, Southwark Tube Station and Cambridge University.

Glen has been a design tutor and lecturer in construction technology at universities in London, Leeds and Sheffield.

Glen has been Chair of the Friends of York Walls since November 2014; a local charity that cares for York’s city walls.

Christopher Turner

BA(Hons), MA

Architectural Assistant

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Christopher joined Mass Architecture as an Architectural Assistant in 2018 after completing his RIBA Parts 1 and 2 at Huddersfield School of Architecture.

Following graduation Christopher worked on a variety of heritage, residential and commercial projects with architectural firms Manchester and Liverpool.

Prior to this Christopher spent time travelling in South America and working towards a Media Studies qualification.

Christopher has a keen interest in languages and painting.

Lesley Waters


Admin Assistant

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Lesley joined mass architecture in 2014 to help with the office administration and bookkeeping on a part time basis.

Lesley’s career began in Glasgow University in 1975 doing scientific research, she then moved to work for Biotechnology companies in the USA and Netherlands.

Having returned to the UK in 2001, after an absence of 15 years, Lesley has been the Operations Manager for a Health Food Company and Sales Manager for a Plastic Stationery company, both in North Yorkshire.

Lesley has been self-employed since 2010 and has a variety of clients, including mass architecture.

Having a keen interest in animals, Lesley has been a Trustee of a branch of the RSPCA since 2003.

Dayang Maamon

BA(Hons), M.Arch. ARB. RIBA


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Dayang Maamon joined Mass Architecture as an Architectural Assistant in 2017 after completing her RIBA Parts 1 and 2 at the Manchester School of Architecture.

Following graduation Dayang spent some time working on a variety of large scale projects with an architectural firm in Malaysia. This led to her being offered a role within an award-winning office in Kuala Lumpur to gain her year our experience.

Dayang migrated to the UK in 2016 where she worked within the interior design and marketing team for a new restaurant in Manchester.

She received her RIBA Part 3 professional qualification in November 2018.

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