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Mass Architecture is a partnership founded by Charlotte Harrison and Glen McGowan in London in 2004.

They relocated to York in 2009 and now work throughout Yorkshire and the North East. They have won design awards for their work in London and York and have been involved in a wide range of projects with local, regional and national clients.

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

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 Chaired the Friends of York Walls: a local charity that cares for York’s city walls, from 2014-2020.  

Ross Harrison

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


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Ross joined Mass Architecture as an Architect in 2022 after working for practices in Beverley and Wakefield since 2014.

During this time he gained valuable experience working on multi-million pound projects within the commercial, industrial and regeneration sectors. Later Ross acted as marketing and PR manager for the practice.

Ross completed his Parts I and II at Liverpool John Moores University.

Ross loves a proper brew and walking his dog.

Michael Martos

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


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Michael joined Mass Architecture in April 2021 having worked in offices in London and York after moving to the UK in 2016. Previously, he worked in architectural practices in Greece on a range of projects including residential houses, hospitality, public buildings and marine/shipping interior design.

Prior to joining Mass Architecture, Michael worked for DPA Architects in London and DSP Architects in York, working on projects of varying scales. He has experience on all phases of design from brief preparation to detail design and construction. Michael has participated in projects in several roles including designer, planner technical designer and project manager.

Lluc Nadal

BSc + MSc in ARCHITECTURE (Arch. Design & Arch. Engineering)


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Lluc joined Mass Architecture as an Architect at the start of 2022.

Lluc has worked in practice within the community, education and urban planning sectors for several years with Stockton on Tees Borough Council and Barcelona City Council.

Lluc has an interest in swimming and badminton.

Sam Sherwood

BA (Hons) Architecture, MArch (1st), ARB, RIBA


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Sam joined Mass Architecture in 2021 having worked previously in Harrogate, Norwich and York. He studied in Huddersfield where he gained his Parts I and II, with Distinction in his Masters of Architecture.

Sam has experience in a range of sectors including heritage and residential.

Sam qualified as an Architect with the RIBA North-West in August 2022.

Sam enjoys architectural sketching and travelling.


Nick Walters

B Arch, BSC Hons

Senior Architectural Assistant

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Nick joined Mass Architecture as a Senior Architectural Assistant in October 2021 after completing RIBA Parts 1 and 2 at UWCC Welsh School of Architecture.

Nick has extensive experience of large scale, new-build residential projects and smaller scale contemporary residential design, as well as care home projects. Nick started his career with Yorkon Ltd. and worked as part of a multi-disciplinary team providing design and specification services for the construction of modular buildings.

Alongside his architectural work, Nick creates art and multi-media works that have been exhibited at art festivals including Illuminating York, Shambala Festival and York Design Week.

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