Commercial estate energy audit, London
Whole-estate audit of a London commercial portfolio identifying significant operational savings and a phased retrofit pathway.
- Location
- London, UK
- Service
- Energy Audits
Unsplash
Energy intensity, monthly index
An ageing commercial estate was facing rising utility costs, inconsistent occupant comfort, and limited visibility on system performance across multiple sites.
- 01Site survey of fabric, HVAC, lighting and water systems
- 02Half-hourly energy data analysis across a 12-month period
- 03Engagement with FM and operations teams to validate findings
- 04Costed retrofit register with payback and carbon impact
A portfolio without a portfolio view
The portfolio's energy spend had been climbing for three consecutive years, but without a coherent view across sites it was hard to prioritise capital. We started with a top-down half-hourly data review to find the biggest signals, then went on site to validate the worst offenders.
What the data revealed
Heating and cooling controls were the largest single contributor — zones running outside occupancy hours, simultaneous heating and cooling, and BMS schedules drifting from intent. Fabric losses and inefficient lighting compounded the problem.
The single highest-value finding was simultaneous heating and cooling in three buildings — a recurring issue that quietly inflates energy spend by 8–15% without ever triggering a fault alert.
How we structured the response
We produced a prioritised register that grouped interventions into three tiers:
- Quick-win operational changes — schedule corrections, setpoint discipline, controls tuning. Sub-12-month payback.
- Medium-term retrofit — lighting upgrades, controls modernisation, targeted fabric work.
- Longer-term strategic upgrades — plant replacement, heat decarbonisation, on-site generation.
The deliverable
A single board-ready document that translated technical findings into capital sequencing, payback and carbon impact — the basis for the next two years of estates investment.
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