top of page
A fully glazed single storey extension in Belfast

Hello and Welcome!

With over 35 years experience in Architecture Glenn established GT Building Design in 2004. GT Building Design is here to help you extend and improve your home. Contact Glenn today for advice, no obligation. 

About GT Building Design

GT Building Design is a Chartered Architectural Practice based in the seaside town of Donaghadee, County Down. By appointing Glenn, you are assured expertise from a reliable and trusted professional.

Stay Updated!

To discover advice, tips and all the latest news don't miss Glenn's Blog. 

Google 5 Star Reviews


Glenn has been incredibly helpful. Glenn moved really quickly and worked with me to get everything done from the initial drawings to design. He submitted everything to planning and building control and got my plans approved really quickly. I am very grateful for that recommendation, because Glenn has been fantastic throughout.

Shaun Brady

Best Residential Extensions & Conversions Architecture Company 2023 - Northern Ireland  ​

GT Building Design / Glenn Thompson 

Best Residential Extensions & Conversions

Architecture Company - Northern Ireland

Best Architectural Technologist (Northern Ireland)

GT Building Design / Glenn Thompson

Best Architectural Technologist Northern Ireland

bottom of page