Update: May 2025 – Overview of QUANTUM ALL ISLAND QUANTUM ALL ISLAND is an online platform by QUINTIN QS (www.quintinqs.com or www.kevinbarryqs.com), a Quantity Surveying business based in Ballygalget, County Down, Northern Ireland. Uniquely, it serves as a specialized hub for construction cost management and procurement, connecting buyers (contractors, developers, design teams) and sellers (construction […]