Our Services for Basement Conversion

Increase your living space with a London basement conversion, offering a unique extension architecture solution that creates a distinctive room. If a traditional house extension isn’t feasible in your location, a basement conversion provides the perfect opportunity to design your dream space away from the outside world, whether it’s a bedroom, home office, playroom, gym, or even a swimming pool.

One great advantage of a London basement conversion is the addition of internal living space without sacrificing your outdoor area or undergoing a complex construction project, making planning approval easier to obtain. Not only does a London basement refurbishment from our basement builders provide extra space for your enjoyment, but it also enhances the value of your property, particularly in desirable urban areas where space is highly valued.

Our Works for Basement Extensions

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Basement Conversion FAQs

What is the cost of a Basement Extension?

The cost of a basement extension from our basement builders varies depending on factors such as the building type, size, location, geology, and conservation area considerations. Here are the estimated costs provided by the Basement Waterproofing Association:

Conversion of an existing basement: £900 – £1,400 per square metre.
Lowering the floor level of an existing basement: £1,500 – £2,000 per square metre.
Excavating a new basement space and underpinning: £2,500 – £3,000 per square metre.

Digging a new basement: £1,500 – £2,000 per square metre.
Creating a light well or external access: £5,000 – £7,500 per square metre.

Additional expenses to consider:

Planning application council fees (if required): £206 (householder application), £462 (if new unit of accommodation is proposed).
Building Regulations application: At least £750.

Party Wall agreement (if required): At least £700 per neighbour.
Additional tax if using VAT-registered contractors: +20%.

Remember to take these factors and costs into account when planning your basement extension project with our basement builders.

Do I need planning permission for Basement Extensions?

If your plan involves converting an existing basement without excavation or altering the external appearance of your property, it is unlikely that you will need planning permission. That said, if you intend to retrofit the basement by adding light, ventilation, or additional structural elements, or if you’re considering creating an entirely new basement, planning permission, along with other required Supplementary Planning Documents (SPDs), will be necessary. Contact us for assistance from a London structural engineer on our team!

Last but not least, if the roof of your new extension connects to the existing roof you will have to subtract the volume of the extension roof from any loft conversion London volume allowance you might have.

Can a Basement Extension boost property value?

Absolutely! A basement extension by our basement builders has the potential to increase the value of your home by as much as 30%. This is particularly evident in areas such as Hammersmith and Fulham, where space is limited, making basement conversions the most sought-after type of extension.