Net-Zero rules will raise new homes prices and extensions

Net-Zero rules will raise new homes prices and extensions

New building regulations aimed at improving energy efficiency are set to increase the price of new homes, as well as those of extensions and loft conversions on existing ones.

The rules, which came into effect on Wednesday in England, are part of government plans to reduce the UK’s carbon emissions to net zero by 2050. They set new standards for ventilation, energy efficiency and heating, and state that new residential buildings must have charging points for electric vehicles.

The moves are the most significant change to building regulations in years, and industry experts say they will inevitably lead to higher prices at a time when a shortage of materials and high labour costs is already driving up bills.

Brian Berry, chief executive of the Federation of Master Builders, a trade group for small and medium-sized builders, says the measures will require new materials, testing methods, products and systems to be installed. “All this comes at an increased cost during a time when prices are already sky high. Inevitably, consumers will have to pay more,” he says.

Gareth Belsham, of surveyors Naismiths, says people who are upgrading, or extending their home, will be directly affected.

“The biggest changes relate to heating and insulation,” he says. “There are new rules concerning the amount of glazing used in extensions, and any new windows or doors must be highly insulated.”

The changes could mean an extra £3,000 added to the bill of an average home extension, according to Jonathan Rolande of the National Association of Property Buyers, a group of professionals aimed at raising construction standards.

Homeowners extending may see the amount of space they have decrease, as walls will have to be thicker in order to comply with requirements for better insulation.

Andrew Mellor, of PRP architects, says new homes’ external walls will need to be about 7cm thicker than previously.

Windows and doors will have to adhere to higher standards, while there are new limits on the amount of glazing you can have to reduce unwanted heat from the sun.

Thomas Goodman, of MyJobQuote, a site which sources quotes, says this will bring in new restrictions for extensions.

“Glazing on windows, doors and rooflights must cover no more than 25% of the floor area to prevent heat loss, ” he says.

As properties become more airtight, there are also measures to ensure proper airflow, such as having small openings (trickle vents) on windows that allow ventilation when a window is closed.

For people extending their homes, they may be required to install a new, or replacement, heating system depending on the size of the build, says Belsham. These will have to use lower temperature water to deliver the same heat, which will require increased insulation of pipes.

“We’ll see more insulation, better lighting design and restrictions on the amount of glass used in some areas. But with more thermal-efficient homes can come the risk of overheating due to solar gain, and so ventilation is also covered,” says Rolande. “As a result, double-glazed windows will require trickle vents to let heat escape and also to provide fresh air for health reasons and, of course, to reduce the risk of condensation build up in an ever-more airtight property.”

As the rules came into effect last Wednesday, property developers were rushing to file plans just before the deadline, according to Belsham. Any plans submitted before that date are considered to be under the previous rules, and can go ahead as long as work starts before 15 June next year.

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