Guide
5 Quick Wins to Improve
Your Commercial
BER Rating
Cost-effective improvements that can boost your building's energy performance before a sale, lease, or reassessment.
Cost-effective improvements that can boost your building's energy performance before a sale, lease, or reassessment.
Last updated: February 2026 · 6 min read
A better BER rating doesn't just help with regulatory compliance — it directly affects your property's value and marketability. Commercial tenants are increasingly demanding better energy ratings as part of their ESG commitments, and institutional investors often have minimum BER requirements in their acquisition criteria. A one or two point improvement in your rating can make the difference between a property that sells quickly and one that lingers on the market.
The good news is that many commercial buildings have significant room for improvement through relatively simple and cost-effective measures. Here are five upgrades that consistently deliver the best return on investment.
Lighting is one of the largest energy consumers in commercial buildings, particularly in offices, retail spaces, and hospitality venues. Switching from fluorescent tubes or halogen spotlights to LED equivalents can reduce lighting energy consumption by 50-70% and has a significant positive impact on BER calculations.
LED upgrades are one of the most straightforward energy improvements. Many can be completed with minimal disruption — often over a weekend or during quiet periods. The payback period through energy savings alone is typically 2-4 years, and the improvement in BER rating is an additional benefit. Installing automatic lighting controls — such as occupancy sensors in corridors, meeting rooms, and toilets, and daylight sensors near windows — provides a further boost to both the BER and real-world energy savings.
Many commercial buildings have heating systems that are perfectly adequate but poorly controlled. Simple improvements to heating controls can significantly reduce the energy consumption calculated in the BER assessment. Upgrades to consider include installing or upgrading a programmable timer so heating operates only when needed, adding thermostatic radiator valves (TRVs) to allow zone-by-zone temperature control, installing a weather compensation controller that adjusts boiler output based on outside temperature, and ensuring the building management system (if you have one) is properly programmed and optimised.
These control improvements often cost a fraction of replacing the entire heating system but can deliver substantial BER improvements.
In many commercial buildings — particularly older ones and industrial units — the roof is the weakest point in the thermal envelope. Heat rises, and a poorly insulated roof allows a significant proportion of heating energy to escape. Adding or upgrading roof insulation is often the single most impactful improvement you can make to a building's energy performance.
For flat-roofed commercial buildings, insulation can often be added on top of the existing roof membrane during planned maintenance or re-roofing works, minimising internal disruption. For pitched-roof buildings with accessible loft spaces, adding mineral wool or rigid insulation board at ceiling level is a relatively simple and inexpensive job. The BER improvement from bringing roof insulation up to modern standards can be dramatic — potentially moving a building up by one or two rating bands.
Replacing all windows in a commercial building is expensive. But strategically upgrading the worst-performing windows — typically the oldest single-glazed or early double-glazed units in the most prominent areas — can improve both the BER and the building's appearance. Focus on windows in heated areas that are in the worst condition. North-facing windows are the highest priority from an energy perspective as they receive no solar gain to offset heat loss.
If full window replacement isn't in the budget, secondary glazing is a lower-cost alternative that can significantly reduce heat loss through single-glazed windows. Even draught-stripping existing windows and doors can make a measurable difference to air leakage and energy performance.
A well-maintained heating system operates more efficiently than one that's been neglected. Before investing in a new boiler or heat pump, make sure your existing system is operating at its best. Have the boiler serviced and efficiency-tested. A modern condensing boiler operating at 90%+ efficiency versus an old non-condensing boiler at 70% efficiency represents a substantial difference in the BER calculation.
If your building has an older, oversized, or inefficient boiler that's approaching end of life, replacing it with a modern condensing boiler, a heat pump, or a hybrid system can deliver a major BER improvement. While this is a larger investment than the other measures on this list, it's often the most impactful single change you can make — and it reduces real energy costs immediately.
Every building is different. The most effective improvements depend on your building's specific characteristics, current rating, and the relative weakness of different elements. Our advisory report — included with every BER assessment — prioritises the improvements that will have the most impact for your particular building.
Get a BER assessment to understand where you stand and which improvements will have the most impact.
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