The building regulations have changed, here’s what you need to know

As of today, Wednesday 15th June 2022, new building regulations are being enforced in England. Part L: Conservation of fuel and power and Part F: Ventilation, have been updated and a brand new Part O: Overheating has been introduced.

The government has put transitional arrangements in place. If your Initial Notice was received before 15th June 2022 and work will start on site before 15th June 2023, work can take place under the old regulations. If these conditions are not met, the new regulations will apply to your project.

It is important to note that the following are not considered as commencement on site: removal of vegetation, demolition of previous buildings, top soil removal, excavation of trial holes, dynamic compaction and general site serving works.

When multiple dwellings or buildings are on a single application, work must have started on each unit for the transitional arrangements to apply. Foundations for blocks of flats is considered as a start on all units within that block.

Part L

New Builds

All new homes are now expected to produce 31% less CO2 emissions than what was acceptable in the previous regulations.

Primary Energy has replaced CO2 as the principal performance metric. This metric considers the estimated energy demand of a property and how much energy is used in the various upstream activities required to get it to the property. A Primary Energy Factor is applied to each fuel type based on how energy intensive its upstream activities are. Compliance with the Primary Energy metric will be simpler for certain fuel types.

To encourage a fabric-first approach to construction, the U-values that should not be exceeded have been improved:

You should also be aware that Approved Construction Details (ACDs) have been removed in a bid to address the performance gap between the designed and actual energy performance of a building and you will be required to file a Building Regulations England Part L (BREL) report that includes photographic evidence that the building has been constructed as designed.

Following the removal of ACDs, we can help with your thermal bridging calculations.

Domestic Extensions

The new Part L includes an uplift in fabric insulation standards, improved U-values and increased thickness of insulation within extensions.

New thermal elements should not exceed the U-values listed here:

Part F

The previous Approved Document F and the Domestic Ventilation Compliance Guide have been replaced by a new Approved Document F, Volume 1: Dwellings and Approved Document F: Volume 2: Buildings other than dwellings. These introduce new guidance for work to existing dwellings and updated ventilation guidance for new dwellings and buildings other than dwellings.

Approved Document F

Part O

The brand new Part O applies to new residential buildings and is designed to reduce the risk of overheating through limiting solar gain in summer and providing adequate means to remove heat from a building.

Overheating calculations are no longer part of SAP Calculations. The new regulations dictate that a Simplified Method of overheating calculations needs to be undertaken. If this doesn’t pass, you will be required to carry out the CIBSE TM59 Dynamic Thermal Modelling Method.

We can help you with both the Simplified Method and CIBSE TM59.

Approved Document O

Working with C80 Solutions

When you contact us for a quote, we will be asking you when your Initial Notice was submitted and when work will be starting on site to establish which regulations apply to you. If you are working to the new regulations, there may be a change in the information we require from you to start our work. Our team is on hand to advise you and guide you through the changes.

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