Mandatory Energy Improvement Regime

Singapore's Mandatory Energy Improvement (MEI) regime is a Building Control framework for energy-intensive existing buildings. The Building Control (Amendment) Act 2024 and related regulations took effect on 30 September 2025; BCA's current guidance explains the audit, improvement-plan, reduction and maintenance duties (BCA, accessed 12 September 2026).

Buildings covered

The regime applies to energy-intensive buildings with at least 5,000 m² of Gross Floor Area (GFA). BCA lists commercial buildings such as offices, hotels and retail buildings, healthcare facilities, institutional buildings including educational, civic, community and cultural institutions, sports and recreation centres, and mixed developments comprising those categories (BCA, accessed 12 September 2026). The 5,000 m² threshold alone does not establish that a building has received an MEI audit notice; coverage also depends on the regime's energy-intensive-building criteria and BCA administration.

The category list is therefore a scope indicator, not a self-issued compliance determination. An owner considering a large office, hotel, healthcare facility, school or mixed development must still distinguish the building's GFA and use from the separate question of whether BCA has issued an MEI audit notice and which records establish the baseline (BCA, accessed 12 September 2026).

Audit and improvement-plan duties

After an MEI audit notice, the building owner must engage a qualified Specified Individual within 90 days to conduct an energy audit. The Specified Individual develops an Energy Efficiency Improvement Plan (EEIP), and the completed audit report including the EEIP must be submitted to BCA within one year from the notice (BCA, accessed 12 September 2026). BCA identifies a registered Energy Auditor or an appropriately qualified Professional Engineer as possible routes for the specified role.

The audit is thus not merely an internal checklist: it produces an EEIP and a report for submission to BCA. The 90-day appointment deadline and one-year submission deadline are different clocks, both triggered by the notice, while the professional's qualification is a defined part of the regime rather than an optional sustainability-consulting credential (BCA, updated 2 September 2026).

Reduction, maintenance and boundaries

The owner must implement measures within three years from EEIP submission to reduce the building's energy consumption by 10% from the average energy-use intensity (EUI) over the three years before the notice. The owner must then maintain the improved performance for one year from the completion-submission date and submit a maintenance report within three months after the maintenance period ends (BCA, accessed 12 September 2026). The 10% figure is a reduction target against the specified pre-notice three-year EUI baseline, not a 10% reduction in floor area, a universal reduction for every building, or a cash incentive. The audit-notice baseline and maintenance duties are part of the compliance chain.

Notice-triggered compliance chain

The regime operates through an MEI audit notice and a sequence of dated obligations. BCA identifies the applicable regulatory requirements as the Building Control (Amendment) Act 2024 and the Building Control (Environmental Sustainability Measures for Existing Buildings) (Amendment) Regulations 2025, both effective 30 September 2025, together with the Code on Mandatory Energy Improvement for Existing Buildings (BCA, updated 2 September 2026). The 5,000 m² GFA threshold and building type identify the regime's potential scope, but the owner-facing deadlines run from the notice, EEIP submission and completion-submission dates. A building owner should therefore not calculate the 10% target or the 90-day appointment period from the building's completion date, the regulation's effective date or a generic annual energy bill.

The Specified Individual is also a defined professional role rather than any person who performs an energy review. BCA points to a BCA-registered Energy Auditor or an appropriately qualified Professional Engineer, and the appointed professional develops the EEIP included in the audit report (BCA, updated 2 September 2026). The regime consequently links building-owner duties to qualified professional engagement, BCA submissions, a measured EUI baseline and later maintenance reporting; it is not a voluntary sustainability label or a general subsidy programme.