Homeowners warned of an 'energy-efficient' update that could devalue property by £26,500

Spray foam insulation is an effective way to enhance insulation and reduce heat loss, and it was approved under the Government's green homes scheme.

However, it has been shown to cause problems for some, particularly for those with timber-framed roofs, as homeowners report issues with the method.

The issues have been reported because the superior insulation can restrict ventilation, leading to condensation issues that can cause structural damage or rot.

Real estate experts at Auction House London said having rot as a result of this could drop the value of a property by 10 per cent.

As the average UK house price sat at £265,375 in August, according to Nationwide, this could mean a drop in value by around £26,500.

Housing expert at Auction House London Andrew Binstock shared advice for homeowners looking to insulate their property.

He said: "If you're considering insulation options for your home and seeking energy-efficient solutions, I recommend using sheet insulation or foam boards made from materials like fibreglass, wool, plastic or natural fibres.

"These options are generally easier to install and remove when necessary.

“While spray foam is seen as more effective in reducing thermal bridging, improper application can trap moisture and lead to complications.

"Sheet materials, when installed correctly, can also help close gaps and minimise thermal bridging."

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Those who already have the insulation should keep an eye on it or see about having it removed, although this can be costly.

Andrew continued: “If you already have spray foam insulation and it’s not causing any issues, you might choose to monitor its condition over time, especially if you’re not planning to move.

"However, if you’re looking to sell or release equity, it may be wise to consult a professional for removal or explore various lenders, as their responses can vary depending on the type of spray foam and its installation."