Watford Central Leisure Centre

Watford, Hertfordshire

Newark Primary School

Port Glasgow, Inverclyde, Scotland

Gillmoss Materials Recovery Facility


Mercia EnviRecover Facility


Witton Park High School

Blackburn, Lancashire

Abu Dhabi Waste to Energy Facility

Abu Dhabi, United Arab Emirates

Bathgate Swimming Pool

Bathgate, West Lothian

Lincolnshire Energy from Waste Facility

North Hykeham, Lincolnshire

Watford Woodside Leisure Centre

Watford, Hertfordshire

Peterborough Energy Recovery Facility


Bulwell Energy Park

Bulwell, Nottinghamshire

Parc Adfer Energy Recovery Facility

Deeside, Wales

Charlton Lane Eco Park


Beddington Energy Recovery Facility


Inverclyde Academy

Greenock, Scotland

Millerhill RERC

Midlothian, Scoltand

Tilbury Green Power Facility

Grays, Essex

East Tullos EfW

Aberdeen, Scotland


GSDA is an architecture and design studio working internationally across a wide range of sectors. We thrive on embracing the challenges offered by working on projects of varying types and sizes. We work closely with our clients, and encourage a collaborative team approach to ensure that our buildings meet the needs of the end user and surpass our clients’ aspirations.

The studio is led by Garry Stewart who has 30 years’ architectural experience in securing and delivering energy and waste, education, residential, and leisure related projects. The GSDA studio consists of a team of skilled architects and designers whose expertise ensures the successful realisation of each project.

Our signature design approach is a contextual one which ensures that our designs recognise and respond to the unique set of circumstances within which each project is conceived and delivered. Whilst we draw upon a wealth of previous experience, we approach our work with no preconceptions and deliver tailored design solutions for our clients’ projects.


  • Abu Dhabi Waste to Energy Facility
  • Barnsley, Doncaster and Rotherham Waste Treatment Facility
  • Barrow MBT Facility
  • Bathgate Leisure Centre
  • Beddington Energy Recovery Facility*
  • Bulwell Energy Park
  • Charlton Lane Eco Park*
  • Craigswood Sports Centre
  • Earlswood Materials Bulking Facility*
  • East London Sustainable Energy Facility
  • East Tullos Energy from Waste Facility*
  • Eliburn Park and Sports Pavillion
  • Frog Island Waste Management Facility
  • Gillmoss Materials Recovery Facility
  • Hespin Wood MBT Facility
  • Hooton Park Sustainable Energy Facility*
  • Houghton Main Timber Recycling & Recovery Centre*
  • Inverclyde Academy
  • Jenkins Lane Waste Management Facility
  • Kings Lynn Academy
  • Lincolnshire Energy from Waste Facility
  • Lochar Moss MBT Facility
  • Mercia EnviRecover Facility*
  • Millerhill Recycling & Energy Recovery Centre*
  • Newark Primary School
  • Ormiston Bolingbroke Academy
  • Ormiston Rivers Academy
  • Ormiston Sandwell Community Academy
  • Ormiston Venture Academy
  • Parc Adfer Energy Recovery Facility*
  • Peterborough Energy Recovery Facility*
  • Slyfield Community Recycling Centre
  • St Bedes Roman Catholic High School
  • Tilbury Green Power Facility*
  • Watford Central Leisure Centre
  • Watford Woodside Leisure Centre
  • Witton Park High School
  • Unless identified by an * the above projects were completed by Garry Stewart in his previous practice.


  • Aberdeen City Council
  • AMEC Foster Wheeler
  • Axis
  • Balfour Beatty
  • Beatona
  • Chinook Sciences
  • CoGen
  • Dalton Warner Davis
  • Enzygo
  • Express Energy
  • FCC Environment
  • Fichtner
  • Hitachi Zosen Inova
  • Intergen
  • Keppel Seghers
  • Laing
  • Mouchel
  • MVV
  • MWH
  • Carbonarius
  • Peel Environmental
  • Pellikaan
  • Shanks
  • SISK
  • Skanska
  • SUEZ
  • Surrey County Council
  • Tamar Energy
  • TAQA Abu Dhabi National Energy Company
  • Urbaser
  • Viridor
  • Wheelabrator Technologies Inc.


+44 (0)20 8544 8085

Please check, some fields could not be empty.

Thanks, we will get back to you as soon as possible.

The operation is taking too much time... Please try again in a few minutes.

Photography © Andy Harrison