Wales first in UK to require renewable electricity on all new homes

family comprising male, female adults and male and female children stood in field with backs to camera pointing at timber clad house with solar panels on roof — *Wales becomes the first in the UK to require all new homes to have renewable energy generated on site* (Image credit: Halfpoint/Getty Images)

Wales has announced a major update to its building regulations, requiring all new homes to include a system for renewable electricity generation.

The move makes Wales the first part of the UK to implement such a widespread renewable energy mandate for residential buildings.

This article outlines exactly what the rules require and why it's not just for solar panels, which homes they apply to, and when the changes will take effect.

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What is being required

Under the amended Part L of the Building Regulations 2010, any newly constructed dwelling or building containing a dwelling must install a system capable of generating renewable electricity on-site.

As the regulations state, a new requirement is being added so that “when a dwelling or a building containing a dwelling is erected, a system for renewable electricity generation must be installed on-site.”

While the law does not specifically mention solar panels, the requirement ensures that new homes contribute to on-site renewable energy generation. Alternative renewable systems may be allowed in cases where solar is technically impractical.

Solar PV Panels – The most common and practical solution for homes
Wind Turbines – Only feasible in sites with enough space and wind resource
Micro-Hydro Systems – For homes with access to flowing water; very rare in typical housing

An onshore wind farm in Scotland — *Wind turbines also fall under the scheme* (Image credit: Getty Images)

Which homes will this apply to

The requirement applies to all new dwellings built in Wales, including single-family homes, apartments, and mixed-use buildings with residential units.

The regulations state exceptions may exist where physical site conditions make it impossible to install an on-site renewable electricity system capable of meeting minimum energy standards.

When the changes will come into effect

The updated regulations will come into force on 4 March 2027, and will apply to any new building where construction has not already begun by that date.

Self-builders and developers will need to ensure renewable electricity systems are included in planning and construction to comply with the new standards.

England is still waiting for the introduction of the Future Homes Standard, which is expected to bring similar requirements for new homes.

News Editor Joseph has previously written for Today’s Media and Chambers & Partners, focusing on news for conveyancers and industry professionals. Joseph has just started his own self build project, building his own home on his family’s farm with planning permission for a timber frame, three-bedroom house in a one-acre field. The foundation work has already begun and he hopes to have the home built in the next year. Prior to this he renovated his family's home as well as doing several DIY projects, including installing a shower, building sheds, and livestock fences and shelters for the farm’s animals. Outside of homebuilding, Joseph loves rugby and has written for Rugby World, the world’s largest rugby magazine.