24-25 St Andrew Square

Sitting at the heart of Edinburgh’s New Town Conservation Area, 24-25 St Andrews Square is a complete refurbishment and extension of two existing properties. The square dates to the 1770s and is part of a UNESCO World Heritage site. As part of the major redesign, Cundall was appointed to deliver building services engineering, vertical transportation and sustainability consultancy.

With planning and listed building consent being granted in July 2022, the development involved the provision of a fourth-floor extension with external roof top terrace, conceived as a modern intervention set back from the B-listed stonework façade. Our multi-disciplinary team were involved in a range of services including replacement of the lifts, full replacement of mechanical, electrical and public health services, establishment of a new electrical substation rated at 800kVA within the St Andrew Square under-pavement vaults, and replacement of roof mounted air handling units. We completed a full dynamic simulation modelling using IES VE to review potential heating/cooling system options at the design stage. Heating and cooling loads were calculated, the EPC rating was generated, and this allowed us to determine the number of credits which could be achieved under BREEAM Ene 01.

Alister Philip, Principal Engineer, commented “We are delighted with what we achieved at 24-25 St Andrew Square. Extensive client engagement was key throughout this project, and allowed us to provide the client with a building which met their expectations. As a BREEAM Excellent building, this is an example of what can be achieved if sustainability and wellbeing are at the forefront of a project”.