Gillespie GRG is a UK-based architectural interiors specialist and the original developer of Zerodec® GRG, a lightweight, high-performance gypsum composite used in complex ceiling and wall systems. With over 70 years of experience, the company has delivered award-winning installations in landmark airports, museums, commercial towers, and public buildings across the UK, Europe, the Middle East, and Asia.

Through in-house design, CNC modelling, and offsite manufacturing across sites in the UK, Ireland, and Poland, Gillespie offers fully prefabricated GRG components with exceptional finish, minimal waste, and fast on-site installation. Their systems are fire-safe, VOC-free, recyclable, and meet BREEAM and LEED standards, making them a preferred solution for forward-looking architects and contractors.

Now part of the Errigal Group, Gillespie GRG continues to expand internationally while maintaining close collaborations with leading designers such as Zaha Hadid Architects, Foster + Partners, and Laing O’Rourke. From major terminals like Heathrow and Jeddah to high-spec developments in London and Dubai, Gillespie brings craftsmanship, technical excellence, and sustainable innovation to every interior project.