How much money does it cost to build a house extension UK?

House extension costs vary significantly from project to project. Depending on size, complexity and location, an extension can cost anything from a few thousand pounds to a six figure sum.

House extensions in the UK increase the living space in your home and can add a significant amount to the value of your property. Extensions can vary from a small addition to your kitchen to a large two storey extension at the rear of your home. Depending on the size, the amount of work you plan to undertake yourself and the complexity of the work, the costs of an extension can vary substantially.

Channel 4 spoke to The National Self Build and Renovation Centre in order to outline the typical house extension costs under four different approaches, assuming that there are no major problems to tackle and that the build is of a good specification and standard.

If you plan to buy most of the raw materials and undertake much of the work yourself, Channel 4 estimates that a single storey (20 metre square) extension will cost £15,900 (or £795 per square metre) whilst a two storey (40 metre square) extension will cost £28,040 or (£701 per square metre).

However, if you plan to employ professionals to carry out the work and not involve yourself at all, the costs will rise accordingly. Channel 4 estimates that by hiring a company to complete the build, a single storey (20 metre square) extension will cost £28,960 (or £1,448 per metre square) whilst a two storey (40 metre square) extension will cost £48,280 (or £1,207 per metre square).

If you plan to manage some of the project yourself, you will find that extension prices will fall somewhere between these two examples.

A house extension can add up to 25 per cent to the value of your home. However, it is vital that you budget carefully for the work and don’t overspend.

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