The grace period for the Building Regulations changes that came into force in June 2022 has now come to an end, meaning that the rules now apply to any projects that haven’t yet started and to all new work moving forward. Marcus Jefford, MD of estimating service Build Aviator, which works in partnership with Jewson, offers a guide to some of the key changes installers need to be aware of.
Although there are some specific changes in relation to heating that must now be followed to make new build properties and renovations on existing properties compliant, in recent conversations with our customers, we know many of you are unclear on what this means and are concerned about the cost implications for your own customers.
Here, we’ve explained the key changes to Part L and how you should navigate the new rules in your role as a plumbing or heating engineer.
Why are changes being made?
The changes to Building Regulations are largely positive and will help to improve the UK’s housing stock. Sustainability is at the heart of the matter, which ultimately benefits homeowners; the changes will lead to higher standards and help to make more energy efficient homes. The new regulations are also a stepping stone to bigger changes coming in 2025, when the Future Homes Standard will be introduced.
However, many feel the communication about how tradespeople in different fields now need to change their usual ways of working to be compliant hasn’t been clear enough. In a nutshell, the changes to Part L centre on energy efficiency. All new homes, extensions or refurbishments that are referred to Building Control will now be assessed under a new Standard Assessment Procedure (SAP) calculation, known as SAP10. The SAP calculation must be performed at the design stage and then again upon completion, measuring the Dwelling Emission Rate (DER) and the Target Emission Rate (TER).
The heat source of every property plays a big role in this calculation, so is particularly important in ensuring properties are compliant. As such, it’s vital that you know how to meet the new standards.
How does this affect my job?
The government has set a target of reducing the carbon emissions produced by dwellings by 31%. However, there are different requirements to achieve this when it comes to new build properties and changes to existing homes.
Gas boilers in new builds must now have a minimum efficiency score of 92%, while oil boilers must meet 91% – or 86% if it’s a combi boiler. New wet central heating systems must be sized to operate at a maximum flow temperature of 55˚C. Once installed, a heat loss calculation must be carried out to ensure the new boiler meets this standard and isn’t oversized. Any exposed pipework must be insulated, and thermostatic radiator valves must be in place on radiators in all rooms other than where the thermostat is installed. The system must be balanced, as well as flushed, cleaned, and inhibitor added in accordance with BS 7593.
As well as a mandatory airtightness test, property developers will also need to provide the owners of the new home with detailed information on their heating controls, including where they are, what they do, and how to maintain comfort and minimise energy use. Plumbing and heating engineers should work closely with the developer to share this information so it can be collated and presented in a clear way for the future residents.
Existing properties
There are steps to take to ensure properties undergoing extensions or renovations that require input from Building Control also adhere to the new standards. However, there is less to consider than if you’re working on a new build.
Key, is that new or full replacement wet central heating systems – including all radiators and pipework – should be sized for a maximum flow temperature of 55˚C. If the property doesn’t allow for the system to be sized in this way, it should be designed for the lowest achievable flow temperature possible. This is to make it easier to retrofit heat pumps in the future.
Products to meet requirements
There are a variety of solar panels and heat pumps available in Jewson’s Making Better Homes range that can help you meet the Part L requirements, as they will help to pass SAP10 measures. That’s because Part L favours renewable and low-carbon energy sources over traditional alternatives, stating that any new-build properties with gas central heating or an electric boiler must have solar PV by law. If not, you must instead install a ground or air source heating system to meet the SAP10 requirements.
Part L also recommends that wastewater heat recovery systems are used in new-build properties. The systems can convert heat that is lost down the drain into heat for new water and can be retrofitted into existing bathrooms or installed into new ones. They’re also available in Jewson’s range.
One thing to consider, is that using these products may mean that costs of your projects rise and will need to be passed onto homeowners. To make this conversation easier, it’s worth explaining the wider context of the changes, informing your customer that the steps you’re taking will not only futureproof their home but will comply with the new regulations.
Planning is key
Now the grace period is over, the products required to meet the new regulations will be high in demand. To make sure you’re always able to deliver for your customers in terms of time and budget, always allow plenty of time to plan and purchase compliant products and buy from a merchant, like Jewson, that has the necessary stock levels. You could also use the Build Aviator estimating tool which guides you through the products and expertise required to remain compliant, and then partners with Jewson to ensure you’re receiving products at the right time for each stage of your project.
This period of change may inflict challenges on the industry. However, if we unite to navigate and fully understand the new landscape, there are opportunities and rewards for all involved.
For further details about the changes and how they might affect you, please see Jewson’s downloadable guide
