Executive Summary

A monthly electricity bill tells you exactly how much you spent. It reveals nothing about where that power actually went. For asset owners and facility managers operating commercial buildings in Singapore, this information gap is not merely an administrative frustration — it is an active financial liability.

Four interconnected pressures make this gap increasingly costly to ignore:

• The scale of invisible waste: Industry benchmarks indicate that a significant proportion of energy in typical commercial buildings is consumed by operational inefficiencies that go undetected without forensic diagnostic tools.¹
• The HVAC burden: In Singapore’s tropical climate, air conditioning and mechanical ventilation (ACMV) systems account for up to 50% of a commercial building’s total energy consumption.² A single degree of miscalibration in chiller set points can compound into material cost overruns across a full operating year.
• Regulatory urgency: Under the BCA’s Mandatory Energy Improvement (MEI) regime, gazetted in October 2024 and implemented from September 2025, energy-intensive commercial buildings with a GFA of 5,000 m² or more are now legally required to conduct energy audits and reduce their Energy Use Intensity (EUI) by 10%.³ Non-compliance carries forced improvement obligations. Identifying waste is no longer an ESG exercise — it is a regulatory requirement.
• OpEx vs. CapEx resolution: A rigorous audit separates immediate, zero-cost operational “quick wins” from targeted capital expenditure, giving asset owners a precise, board-level roadmap for return on investment.
• The in-house blind spot: Facility teams are often structurally incentivised to overcool buildings to pre-empt tenant complaints. Independent, tech-enabled audits remove this bias, balancing tenant comfort with disciplined energy reduction.

Phase 1 (Days 1-7): Establishing the Live Digital Baseline

The first week of the Savills energy audit moves entirely away from retroactive utility bills and paperwork. The objective is to establish a live digital baseline of how the building actually behaves under real thermal loads and occupancy conditions.

Beyond the Utility Bill

Standard utility bills are lagging indicators. They confirm expenditure; they explain nothing. The Savills audit team bypasses these by tapping directly into the existing Building Management System (BMS) to extract highly granular operational data logs — capturing how the building’s systems are performing hour by hour, floor by floor.

Deploying the Technology

Non-intrusive IoT (Internet of Things) sensors are deployed across critical zones throughout the tower. These devices monitor real-time temperature, humidity, and lux levels precisely where tenants interact with the space — not where the system was designed to perform on paper.

Mapping Reality Against Design

The fundamental objective of Phase 1 is to document the gap between how mechanical systems were designed to operate and how they actually run under live conditions. This divergence — often significant in buildings more than ten years old — is where the majority of invisible waste originates.

Phase 2 (Days 8–21): Forensic Analysis and the ‘Quick Wins’

With live data flowing, the focus shifts to identifying where the building is actively bleeding energy. Savills engineers run the gathered data through advanced diagnostic software to surface anomalies that are invisible to manual inspection.

Chiller Set Point Drift

One of the most pervasive forms of invisible waste occurs in the chiller plant. Diagnostic analysis frequently reveals chillers producing colder water than ambient conditions require — consuming substantially more energy than necessary to achieve the same occupant comfort outcome.

Rogue VAV Boxes

Diagnostic tools routinely identify Variable Air Volume (VAV) boxes stuck in the open position. These faulty components deliver conditioned air into unoccupied spaces around the clock, quietly inflating energy consumption in ways that aggregate utility bills cannot isolate.

The Override Epidemic

Facility managers regularly apply manual overrides to automated systems when responding to localised comfort complaints. Without a structured reset protocol, these overrides persist for weeks or months — leaving energy-intensive equipment running at full capacity long after the original issue has been resolved. Phase 2 diagnostic analysis typically surfaces multiple concurrent overrides in any commercial tower of scale.

Phase 3 (Days 22-30): The Strategy and ROI Roadmap

The final phase of the Savills energy audit translates dense engineering data into a clear, board-level financial strategy. The deliverable is an actionable roadmap that categorises solutions by cost and impact, enabling asset owners to sequence investments with precision.

Zero-Cost Quick Wins (OpEx)

The audit identifies immediate operational adjustments — recalibrating set points, correcting BMS scheduling logic, and removing accumulated manual overrides — that yield measurable energy savings without capital expenditure. For many buildings, these quick wins alone are sufficient to reduce EUI materially and exit the MEI compliance threshold.

High-Yield Upgrades (CapEx)

For ageing infrastructure where operational adjustments are insufficient, the roadmap provides targeted recommendations for physical retrofits — variable speed drives, LED upgrades, or chiller plant replacement. Every recommendation is supported by precise payback period calculations and projected ROI, enabling budget approval processes to proceed on an evidence basis rather than estimation.

The In-House Blind Spot

In-house facility audits consistently underperform against independent assessments. Local teams typically lack both the diagnostic software required to interrogate BMS data at the requisite depth and the operational distance to audit processes they manage daily. External expertise removes these structural constraints, delivering an unbiased action plan built on objective data.

Strategic Recommendations: A Risk-Adjusted Framework

Maximising the value of a 30-day diagnostic requires a structured approach to implementing its findings. The Savills Energy and Sustainability Management team recommends the following three-stage deployment strategy.

1. Implement Zero-Cost Operational Tweaks Immediately

Action: Authorise the facility management team to execute the quick wins identified in the audit report — correcting BMS schedules, removing manual overrides, and recalibrating set points — within the first 30 days post-audit.

Best-Case Scenario: The asset immediately reduces its EUI without capital expenditure, exiting the MEI compliance threshold and generating measurable monthly utility savings from day one.

Conservative Scenario: The building arrests its pattern of energy leakage, stabilising baseline consumption and establishing a clean operational foundation for subsequent capital investment.

2. Execute High-Yield CapEx Upgrades

Action: Use the audit’s ROI calculations to secure budget approval for targeted mechanical upgrades, sequenced to align with planned building refurbishments where possible to minimise operational disruption.

Best-Case Scenario: Targeted upgrades advance the building toward Green Mark certification, unlocking access to preferential green financing and supporting a rental premium positioning for top-tier corporate tenants.

Conservative Scenario: The upgrades ensure full compliance with MEI regime requirements, protecting the asset owner from mandatory intervention and associated financial penalties.

3. Shift to Continuous Commissioning

Action: Rather than removing all monitoring infrastructure at the close of the 30-day audit, transition to a permanent smart monitoring system to track EUI and system health on an ongoing basis.

Best-Case Scenario: Predictive maintenance alerts identify equipment degradation before mechanical failure, extending the operational lifespan of expensive HVAC assets while sustaining peak efficiency performance.

Conservative Scenario: Continuous monitoring prevents the recurrence of system drift and undetected overrides, ensuring that the operational savings captured in the initial 30-day audit are sustained across the full lease cycle.

Stop Paying for Invisible Inefficiency

Invisible energy waste is a solvable problem — but only with the forensic visibility to detect it. The 30-day energy audit is not an administrative obligation; it is the most cost-effective first step toward MEI compliance, operational resilience, and increased asset valuation.

With the MEI regime now in force and energy tariffs continuing to rise, the window for proactive action is narrowing. Asset owners who move ahead of compliance deadlines will be better positioned to capture the operational savings, financing advantages, and tenant premiums that energy-efficient buildings command.

Take Action Today

The clock on regulatory compliance is ticking. Contact the Savills Energy and Sustainability Management team today to schedule a preliminary health check for your commercial tower and uncover your hidden savings.

Footnotes

¹ Source: Building and Construction Authority (BCA), Building Energy Benchmarking Report 2023. Available at: https://www1.bca.gov.sg/docs/default-source/docs-corp-buildsg/sustainability/bca-building-energy-benchmarking-report-2023.pdf

² Source: National Climate Change Secretariat and National Research Foundation, “Air-Con System Efficiency Primer: A Summary”. Available at: https://www.nccs.gov.sg/files/docs/default-source/default-document-library/air-con-system-efficiency-primer-a-summary.pdf

³ Source: Building and Construction Authority (BCA), “Mandatory Energy Improvement (MEI) Regime” (Building Control Amendment Act 2024, gazetted 11 October 2024). Available at: https://www1.bca.gov.sg/buildsg/sustainability/regulatory-requirements-for-existing-buildings/mandatory-energy-improvement-regime