Building Optimisation Survey

Unlock energy efficiency through intelligent building performance insights

Is hidden energy waste in your building adding unnecessary costs to your bills?

A Building Optimisation Survey focuses on how your building actually operates, uncovering behavioural, technical, and control-based inefficiencies that drive energy use and cost.

We combine on-site expertise with detailed data analysis to identify practical, cost-effective improvements – many of which can deliver a return on your investment within 12 months.

  • Reduce energy bills

  • Lower carbon emissions

  • Enhance building performance

  • Support your net zero or sustainability goals

Key features and benefits

Understand what’s driving energy use in your building

We take a holistic view of your building, assessing how systems, controls, and day-to-day operations interact to influence overall energy performance.

Tailored on-site assessment

Our experienced energy consultants carry out targeted on-site surveys, including out-of-hours assessments, to understand what’s really driving energy use and identify inefficiencies that data alone cannot reveal.

Data-driven analysis for clear visibility

Using detailed half-hourly consumption data, we identify usage trends, anomalies, and areas of hidden waste. The result is full visibility and control over your energy performance.

Prioritised project register

You’ll receive a structured project register of energy-saving opportunities, each with clear cost, savings, and payback estimates. The detailed report enables confident, data-backed decision-making.

Focus on quick wins

We prioritise low- and no-cost improvements, helping you achieve rapid results. Many recommendations deliver payback within 12 months, providing investment in longer-term improvement measures.

Lower your carbon footprint

By addressing inefficiencies, you’ll reduce energy bills, cut carbon emissions, and improve overall building performance, supporting both financial and net zero goals.

 

How does it work?

Our approach combines detailed data analysis with practical engineering expertise to uncover where energy is being wasted and where performance can be improved. From initial assessment through to implementation support, we help you turn insight into clear, prioritised actions that reduce consumption, improve efficiency and support your wider sustainability goals.

We review your energy consumption patterns using granular data, analysing trends across time, usage peaks and inefficiencies. By combining meter data, building management system insights and operational context, we build a clear picture of where and how energy is being used, and where opportunities exist to optimise performance.

Our experts assess how your building is operating in practice, including plant performance, controls, and out-of-hours usage, to pinpoint hidden energy waste. We look beyond the data to understand real-world conditions, identifying issues such as equipment running unnecessarily, poor control strategies, or suboptimal settings that may be driving excess consumption.

We identify inefficiencies and areas for improvement, highlighting both quick wins and longer-term optimisation opportunities. From low-cost behavioural and control changes to targeted equipment upgrades, we prioritise actions based on impact, feasibility and alignment with your operational and sustainability goals.

You receive a prioritised project register outlining clear costs, alongside estimated savings and payback times, so you can make informed investment decisions.

Our expert mechanical and electrical (M&E) engineering team can support you in delivering your project register. From leveraging renewable energy solutions and implementing decarbonisation strategies, to installing LED lighting, our team can work with you to integrate energy-saving measures.

Frequently Asked Questions

A Building Optimisation Survey is a detailed review of how your building operates day-to-day. It identifies inefficiencies in systems, controls, and behaviours that impact energy use and cost.

Traditional audits focus on infrastructure and compliance. An optimisation survey goes deeper, analysing real-world operation, data patterns, and user behaviour to uncover hidden, actionable savings opportunities.

Examples of improvements identified include:

  • Misaligned BMS and HVAC controls
  • 24/7 operation of boilers and water heaters
  • Overcooling in server rooms
  • Lights, PCs, or equipment left running unnecessarily
  • Open windows during heating/cooling

Many recommendations, particularly low- and no-cost actions, can deliver a return on investment within 12 months or less.

No. While buildings with a building management system (BMS) can unlock deeper insights, our audits are designed to add value across all building types by focusing on both technical systems and operational behaviour.

You will receive a detailed report including identified inefficiencies; a prioritised project register including cost; savings; and payback calculations; clear recommendations for improvement.

Yes, Zenergi can support delivery through our wider M&E services team, ensuring improvements are implemented effectively and deliver the expected savings.

Ready to discover smarter energy management?

Get in touch with our team today and start unlocking hidden efficiencies in your buildings.

Find out more.
Customer success stories

Our experience

View all

Annual saving of £61,000+ and immediate ROI from TM44 A/C Inspection.

Discover how a global data centre accessed major operational savings and maintained compliance.

Saving from cleaning the chillers
£
40,000+
Saving from adjusting the schedules
£
21,000+
Saving from upgrading the chillers
£
337,000+

A transport transformation: How TfGM is driving Greater Manchester's carbon neutral future.

Discover how our partnership helped Transport for Greater Manchester accelerate toward their 2038 net zero target.

Total saving
£
170,000
Carbon dioxide reductions
410
tCO2e
Solar PV solutions
510,000
kWh

Annual carbon emissions reductions of 129 tCO₂e for Royal Brompton and Harefield Clinical Group.

Zenergi has partnered with Royal Brompton and Harefield Clinical Group for many years and is actively supporting their journey to net zero.

Annual carbon savings
129
tCO2e
Annual cost saving
£
38,000

Connexus: lowering bills for housing development residents.

Discover how Zenergi helped reduce heating bills for residents of the award-winning Rocks Green shared ownership development.

Harry Eaves

Senior Energy Consultant

Zenergi

Discover how our energy audits highlighted £94,955 of annual savings for Aldermore Bank.

We’re helping Aldermore Bank to reduce carbon emissions and cut costs – all while keeping the bank’s net zero strategy firmly on track.

Total carbon saving
172.6
tCO2e
Total annual cost saving
£
94,955

Greener transport: helping Gregory Group meet ambitious goals.

A science-led partnership with one of the UK’s largest transport groups that led to impressive net zero acceleration.

Harry Eaves

Senior Energy Consultant

Zenergi

Halving Glenmorangie’s energy costs through strategic building optimisation.

Discover how our partnership helped a whisky giant transform their facility’s energy efficiency with targeted solutions.

Estimated annual electricity consumption savings
59
%
Estimated annual gas consumption savings
52
%
Estimated annual overall energy savings
55
%

How Climate Change Agreements motivated Koito Europe Ltd to save over £100,000 annually.

Discover how our partnership approach to Climate Change Agreement management delivers sustained savings for this leading vehicle lamp manufacturer.

Leanne Cinderby

Chief Operations Officer

Zenergi

Partnering with PR Associates to drive compliance and energy efficiency in schools.

We’re helping to ensure over 100 schools have the confidence to focus on their priorities – all while remaining compliant and optimising efficiency.

Simon Watts

Partnerships Manager

Zenergi

Zenergi’s siteworks expertise delivers Manchester’s major tram extension on time.

Zenergi's siteworks expertise delivers Manchester's major tram extension on time.

Leanne Cinderby

Chief Operations Officer

Zenergi

Keeping energy costs under control for MK2 Real Estate

Discover how strategic procurement and ongoing oversight supports a growing property portfolio.

Mark Leonard

Strategic Client Partner

Zenergi

Uncovering potential energy savings of 26% for East Sussex County Council

Discover how we identified potential annual savings of more than £52,000 for a progressive Local Authority with ambitious net zero targets

Identified energy savings
1,042,371 kWh
Identified cost savings
£52,567
Identified carbon savings
194
tCO2e

ESOS audit identifies £4 million in cost savings.

Explore how our ESOS Phase 3 audit uncovered a 5% energy reduction and a two-year ROI for a FTSE 250 food and drink manufacturer.

Energy reduction
33,093 MWh
Cost savings
£4.1 million
Carbon reduction
6,219
tCO2e

Unlocking £5 million in savings with ESOS compliance

How a global renewable energy leader turned ESOS into a strategic opportunity for efficiency and sustainability.

Energy savings
26,000,000 kWh
Carbon reduction
8,300 tCO₂e
Cost savings
£4.91 million

Powering a historic dining hall for St John’s School.

Our Siteworks team streamlined a complex meter installation to meet ambitious timescales and ensure a new dining hall opened on time.

Karina Joshi

Strategic Customer Success Manager

St John's School Customer Success Manager

Bill Validation case study for independent school

How one conversation led to a £107,000 refund for a leading independent boarding school

Billy Pryke

Strategic Customer Success Manager

How our energy audit identified savings of £50,000 for E-ACT.

Discover how our exciting new programme for Multi-Academy Trust, E-ACT, identified huge carbon and cost savings in just six months.

Identified energy savings
246,193
kWh
Identified carbon savings
48.16
tCO2e
Identified cost savings
£
50,114
How we helped Danes Educational Trust unlock £166,000 for carbon reduction.

How we helped Danes Educational Trust secure £166,000 for carbon reduction.

Phase 2 LCSF grant awarded
£
39,000

Leigh Academies Trust saves £500,000+ through flexible energy purchasing.

Discover how a 10+ year partnership helped one of the country’s largest and most established Multi-Academy Trusts navigate a turbulent energy market

Achieved savings: Year one
£
399,311
Forecast savings: Year two
£
200,287
Forecast savings: Year three
£
43,511

Shropshire Council: Enabling compliance for over 10 years.

We’re helping Shropshire Council to achieve compliance through Display Energy Certificates and progressively reduce its environmental footprint. Zenergi is also enabling targeted energy reduction in key buildings.

Darren Myers

Carbon Compliance Manager

Zenergi

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