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An Overview of House extension cost in London

 Are you planning your first house extension in London? However, not sure how much would you spend for the extension? This article will share all the information you need to know about house extension costs in London. Our company will explain everything in detail once you approach us for your extension project.

 Factors to consider while calculating house extension cost in London:

The idea of house extension is cheaper compared to moving to a different house or constructing a new one. Several decisions are involved before planning your extension building. This is the reason it is important to get a proper clarification on extensions cost before you dive into it. And we in Benitor believe in transparency. We will discuss the following pointers before initiating the work-

  • Factors influencing the cost of a house extension in London
  • How to save money on an extension
  • Any additional charges required
  • Factors involved in fitting an extension

Cost of a house extension:

The cost of a house extension in London depends on factors like the size of the space and the design specification. Smaller and less complicated extensions are affordable. Typically the following factors impact the cost of an extension-

  • Number of storeys to be built
  • Shape and size of the extension
  • The quality of the equipment and material
  • Designs of the extension
  • Whether the extension contains a bathroom, kitchen or a bedroom
  • Your location in London

We give a rough idea about how much an extension can cost you-

  • Side return extension cost – starts from £44K
  • Rear kitchen extension cost – starts from £55K
  • Wrap-around extension cost – starts from £65K
  • Double storey extension cost – starts from £75K onwards
  • Small extension cost – ranges from £40K to £50K

It is important to consider whether an extension is financially viable and right for your property. However opting for a house extension in London, especially with professionals like us would mean you’ll save on money cost, planning permission cost, stamp duty and solicitor fees.

Additional costs of house extension:

There are a few other costs which you might need to consider when building an extension.

  • The cost to hire an architect is £18 to £30 per hour
  • The cost implied on groundwork is £30 to £50 per cubic meter
  • The cost to install drainage is around £700 to £1000

Planning permission cost:

Before building a house extension in London, your construction plan must be aligned with planning permission regulations. This will prevent the further cost of around £200 for the planning application.

However, we ensure that to avoid paying extra money, your extension plan must meet the following criteria-

  • Our extension construction will not cover half of your property’s land
  • The extension will not exceed the highest point of the roof on the existing property
  • Our work will not involve installing raised platforms, balconies, vent pipes, chimney flues, cladding or any work on the roof
  • The side extension of a property will not exceed four meters in height from the side elevation
  • Our single-storey rear extensions will not extend more than four metres beyond the rear wall of a detached property or three metres for any other
  • Our double-storey extensions will not extend over four metres from the back wall of the property and will not be within seven metres of a property boundary
  • All windows on the top floor of a double-storey extension will be obscure-glazed if located on a side elevation

In addition, some constructions require building regulation costs that include flooring, internal and external walls, ventilation and foundations.

Contact us:

Get in touch with our team to know further information about house extension costs in London. You may call us directly at 0207 101 4646 or email us at contact@benitor.co.uk

What our

Clients say

”After quality of workmanship problems with another builder, I contacted Benitor to take over. We agreed a day rate for their work, as much of the work had been started. In my experience this can lead to big bills but they were impeccably correct in their billing. Not only were they a lot better quality than the original builders but they were also lower cost. I was delighted with the result.

Apartment refurbishmentFulham

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