Sustainability Report

Embodied carbon strategies 

• Although initially conceived as a refurbishment within the constraints of the existing utilities — a 200 A three-phase electrical supply and a natural gas connection — Holland Harvey and services engineer Introba quickly identified that retaining fossil fuel infrastructure would lock the hotel into a high-carbon energy pathway for at least another 15 years.
• Instead of a conventional gas-based system, the design team reviewed the existing building fabric to optimise energy performance through dynamic thermal modelling and passive strategies. The analysis considered the predominantly east–west orientation, with measures introduced to enhance solar control and reduce mechanical demand. These interventions allowed the scale of the heating and cooling systems to be reduced, in turn minimising embodied carbon in plant equipment and roof-mounted infrastructure.
• Selective material upgrades — including the reuse of existing structural and facade elements — further reduced embodied carbon by limiting demolition and replacement.

Technical and product notes

Acoustic design by Clarke Saunders who specified:

• Caice CS600 acoustic screens enclosing rooftop plant
• Regufoam Vibration 150 Plus isolation mats in the gym floor

Windows by Lomax & Wood:

• 15 Timber Box Sash Windows on ground-floor extension
• 16 Bespoke Wooden Casement Windows on basement extension

Rooflight and glazing by Glazing Vision:

• Flushglaze Eaves Rooflight

Operational emissions strategies 

• Following extensive discussions with UK Power Networks, the project secured an upgraded 400 A electrical supply by replacing the transformer in the adjacent property, enabling a fully electric services strategy. 
• Introba developed an all-electric system combining air-source heat pumps and a Variable Refrigerant Volume (VRV) network for heating and cooling. 
• Hot-water generation was integrated into the VRV system to reclaim waste heat from cooling, lowering peak summer electrical loads and reducing the number of rooftop units required.
• Originally, limited gas connections were retained for catering and decorative fireplaces, but Miiro’s experienced development team ultimately committed to an all-electric operation. The kitchen now runs entirely without gas and the final gas fireplace was removed before completion. As a result, Miiro Templeton Garden no longer burns fossil fuels. 
• A modest photovoltaic array on the mansard roof contributes to the hotel’s electricity supply, while the Building Management System and sub-metering — monitored by Introba — allow real-time tracking of energy use to inform ongoing optimisation and future hotel developments.