KJ Tait

28 St Andrew Square, Edinburgh

AVIVA Investors

KJ Tait is currently working to the NABERS Design for Performance framework for a refurbishment and new build project in Edinburgh city centre. Constructed in 1898, 28 St Andrew Square is a Category A listed building within the Edinburgh World Heritage Site Boundary. We are currently working with the Architect to understand the energy implications from retaining the single glazed windows but improving the infiltration through the units, achieving LETI fabric performance on the new build portion and reducing thermal bridging heat losses.


The modelling identified a need to provide mechanical ventilation to the office spaces, we have designed this with thermal wheel heat recovery to maximise the heat recovered and demand controlled ventilation based on CO2 sensors so that fan powers can be regulated to suit occupancy. The offices will be conditioned by VRF with external condensers located on the building roof. Investigatory work with the City of Edinburgh Council is being conducted to understand if photovoltaic panels can be installed to provide electricity and ensure a security of supply.


It is expected that the building will be capable of achieving 4-4.5 NABERS Rating Stars out of 6 once in operation due to low energy design and effective management of the building services.