extension Use our simple home extension cost calculator tool to receive an instant price estimation for the design and construction of your project. --- Small (0-5 m2) Medium (5-15 m2) Large (15-30 m2) Very Large (30-50 m2) Vast (50-100 m2). The above calculator is based on estimates as a starting price for a house extension. Above costs assume modest finishes, fittings, electrics and lighting. From our recent research and survey of architects, the starting cost per square meter is £2,400 m/2 INC.VAT (or from £2,800 m/2 INC.VAT in London/South East England ). Double storey extension.

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Tips to cut the cost of your extension. Choose a simple design - the most cost-effective floor plan is square (future buyers will appreciate neutrality, too) Plan ahead as much possible; If you have time, consider being your own project manager ; If you have good DIY skills, do some of the more basic work yourself. The house extension cost calculator considers the following items: Extension area (width x depth) The type of extension (rear, side, loft, single or double storey etc.) The style of your property (detached, semi-detached or terrace) Roof style (flat roof, mono-pitched, dual-pitched or crown roof). The number of skylights & size of bifold.