Minimum Energy Efficiency Standard (MEES)

In England and Wales the MEES regulations are being introduced in two stages:

  1. From 1 April 2018 it is not possible to grant a lease on a non-domestic building in England and Wales to a new tenant or renew a lease with an existing tenant unless the Energy Performance Certificate (EPC) for the property meets the minimum E rating.
  2. From 1 April 2023 all other rented property must achieve a minimum E rating.

Initial analysis carried out by WSP | Parsons Brinckerhoff suggests that up to 35% of commercial building stock in England and Wales could be affected by these regulations. This calculation is based on two factors:

  1. Around 18% of non-domestic buildings with valid EPC’s are F or G rated today.
  2. EPC bandings get progressively tighter as Building Regulations tighten over time. So a building that was E rated when its EPC was prepared originally, may be at risk of dropping to an F or even G rating in 2018.

One of the main reasons for poor EPC ratings is the inappropriate use of assumptions and default values in the original EPC assessment and modelling process. In many cases, correctly rerunning the EPC process lifts the property out of the F and G classes.

If you think re-running your EPC assessments would be useful or you have a F or G rated property and need some assistance, please contact

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