Savills China | Article

The Direct Answer

Green Mark Platinum is widely assumed to require a full building overhaul and a substantial capital programme. In practice, that assumption often overstates the cost. For many ageing commercial assets, a large share of the distance to certification is operational rather than structural — inefficiencies that can be corrected before a single major system is replaced.

This case study walks through how a mid-sized commercial office tower in Singapore's CBD reaches Green Mark Platinum within a constrained budget, using a structured, data-driven sequence: energy diagnostics first, then phased retrofitting, then procurement timed to minimise disruption. The gap between a "brown" asset and best-in-class green performance is frequently narrower than owners expect — and knowing precisely where that gap sits is what keeps the capital programme lean.¹ For a fuller explanation of the Green Mark tiers and what Platinum demands, see our companion guide, Decoding the BCA Green Mark: The 2026 Guide.

The Building Profile: Starting Conditions

- Asset type: Mid-sized commercial office tower, CBD location, GFA approximately 15,000 m².

- Age and condition: Around 18 years old; original HVAC and lighting systems largely intact; no prior green certification.

- Energy baseline: Energy Use Intensity (EUI) sitting above the prescribed threshold for three consecutive years — the trigger that brings a building within scope of the Building and Construction Authority's Mandatory Energy Improvement (MEI) regime, which took effect on 30 September 2025 and applies to energy-intensive buildings of 5,000 m² or more.²

- Owner objective: Achieve Green Mark Platinum within 18 months, without a full building shutdown or major structural intervention.

- Budget constraint: A capital envelope well below the cost of a full mechanical and electrical overhaul, with operating-cost savings from early works expected to partially self-fund later stages.

The regulatory context matters here. Under the MEI regime, an owner served with an audit notice must engage a qualified professional within 90 days, submit an energy audit and Energy Efficiency Improvement Plan within a year, and implement measures to cut the building's EUI by at least 10% within three years.² For this asset, the commercial question was not whether to act, but how to act efficiently — and whether the same programme that satisfies MEI could be pushed further to reach Platinum.

The Diagnosis: What the 30-Day Audit Revealed

A focused 30-day audit, combining building management system (BMS) data extraction with IoT sensor mapping, surfaced a clear picture:

- Three manual BMS overrides had been left active for an estimated 14 months, driving sustained air-conditioning and mechanical ventilation (ACMV) overconsumption.

- Thermal zoning inconsistencies across the upper floors, caused by a mix of variable-air-volume (VAV) box faults and set-point drift in the chiller plant.

- Legacy lighting: roughly 60% of installed fixtures still ran on older fluorescent technology — one of the highest-yield, lowest-complexity upgrade opportunities in the building.

- Gap analysis against Green Mark Platinum confirmed the building was closer to certification than assumed. The majority of the shortfall traced back to operational inefficiency, not infrastructure deficiency.

The headline finding: an estimated 18–22% EUI reduction was achievable through a combination of zero-cost operational corrections and a focused, mid-range capital programme — comfortably clearing the MEI 10% requirement and reaching into Platinum territory.³

The Strategy: A Three-Stage, Budget-Sequenced Programme

Stage 1 — Zero-Cost Operational Corrections (Months 1–2)

- Removal of all identified manual BMS overrides.

- Chiller set-point recalibration aligned to ambient load conditions.

- VAV box remediation and recommissioning.

Estimated EUI impact: 8–10% reduction, at effectively zero capital cost. The asset exits the MEI compliance-risk threshold early, and the resulting operating-cost savings begin accumulating immediately to help fund Stage 2.

Stage 2 — High-Yield Capital Retrofits (Months 3–10)

- Full LED lighting upgrade across common areas and tenanted floors.

- Variable speed drive (VSD) installation on primary HVAC pumps and fans.

- Chiller plant controls upgrade to enable demand-based operation.

Works were sequenced to align with tenancy changeovers wherever possible, minimising disruption and reducing preliminaries cost. Estimated EUI impact: a further 10–12% reduction, with cumulative savings generating positive payback within about 36 months.

Crucially, a programme of this type may qualify for outcome-based co-funding under BCA's Green Mark Incentive Scheme for Existing Buildings 2.0 (GMIS-EB 2.0), which supports Energy Improvement Works for privately owned existing buildings of at least 5,000 m² that achieve Platinum, Super Low Energy or Zero Energy outcomes — a lever that materially improves the budget maths for owners planning ahead.⁴

Stage 3 — Green Mark Submission and Continuous Commissioning (Months 11–18)

- Green Mark Platinum documentation prepared and submitted to BCA.

- Permanent IoT monitoring infrastructure retained post-audit to sustain performance and support ongoing compliance reporting.

Outcome: Green Mark Platinum achieved within the 18-month window and within the original capital envelope — and well inside the statutory MEI implementation timeline, converting a compliance obligation into a certification milestone.

The Results: What Changed

Metric	Before	After
EUI	Above MEI threshold	Green Mark Platinum band
Annual energy cost	Baseline	Estimated 20–22% reduction
Green certification	None	Green Mark Platinum
MEI compliance status	At risk	Fully compliant
Capital payback period	—	Approximately 3 years

Key Lessons for Asset Owners and Tenants

The operational gap is consistently underestimated. In most commercial buildings over ten years old, a material share of the distance to Green Mark certification comes from operational inefficiency rather than infrastructure age. Audit first; invest second.

Sequencing is a budget multiplier. Aligning retrofit works with tenancy changeovers and existing maintenance cycles can reduce project costs by an estimated 15–20% against standalone procurement.

Continuous commissioning protects the investment. Platinum is not a one-time achievement. Permanent monitoring is the most cost-effective way to sustain certified performance across a building's operational life.

Early engagement changes the economics. Owners who bring in an independent energy consultant before committing to a capital scope consistently achieve better outcomes than those who go straight to contractors. The diagnostic phase defines what needs to be spent — and, just as importantly, what does not. This is also the crux of the wider capital decision facing many ageing assets; our analysis Retrofitting vs. Rebuilding: A Cost-Benefit Analysis for Aging Singapore Assets sets out how to weigh the two paths.

What This Means for Your Asset

The pathway from brown to green is rarely as capital-intensive as owners assume. With the MEI regime now in force and green financing increasingly tied to certified performance, the business case for proactive action is stronger than it has been — and the cost of waiting for an audit notice, rather than getting ahead of one, is rising.

Take the First Step

Is your building carrying hidden energy inefficiencies that are eroding its value and compliance standing? The Savills Energy and Sustainability Management team can conduct a preliminary building health check to establish how close your asset already is to Green Mark certification — and map the leanest route there.