BREEAM V7 & The Fossil Fuel Ban: Targeting ‘Outstanding’ and ‘Excellent’
BREEAM v7
A BREEAM ‘Outstanding’ rating used to be the ultimate trophy, a signal of prestige.
In 2026, under the new BREEAM Version 7 and the UK Net Zero Carbon Buildings Standard (UKNZCBS), it has become something far more practical: a requirement for future-proofing asset value against a rapidly decarbonising market.
The biggest shift we’re seeing isn't just a tweak to the credits; it’s a hard line in the sand. If you are targeting ‘Outstanding’, the era of on-site fossil fuel combustion is over.
The Mandate: No Gas, No Exceptions
Under BREEAM V7, achieving the top-tier ‘Outstanding’ rating now carries a mandatory requirement: zero on-site fossil fuel combustion for heating, hot water, or power. You can no longer "offset" a gas boiler with better ecology credits or cycle racks.
While this sounds like a technical hurdle, it is actually a commercial one.
Institutional investors and Grade-A tenants are increasingly stripping gas-reliant assets from their target lists. If an asset can’t reach Outstanding because of its central plant, it is effectively volunteering for a "brown discount" at its next valuation.
The Role of TM54: Proving the Business Case
Removing gas is only half the battle; the real challenge is making an all-electric building perform efficiently in the real world. This is where we use CIBSE TM54: Operational Energy Modelling.
Unlike standard compliance modelling, which tells you how a building should perform in theory, our TM54 assessments provide a "stress test" for your all-electric strategy. We use it to:
Forecast Actual Costs: Proving to tenants that an all-electric building won't lead to skyrocketing service charges.
System Sizing: Ensuring heat pumps and thermal storage are sized for peak demand without over-specifying (and over-spending) on plant.
Closing the Performance Gap: Bridging the gap between design intent and how the building is actually managed day-to-day.