How Much Does It Cost to Build an Extension?


The approximate build cost for an extension is as follows: Planning cost £1,000 - £3,500; Shell Build £600 per square metre; Fixtures and fittings £400 per square metre; and Decorating and finishing £10 - £15 per square metre. The exact overall build cost will depend on the size of the extension errected.
3 Additional Answers
Building extensions cost differs depending on the length of the extension for example a double storey extension costs between £1130 £500-1500 per m2, and a single storey costs £975 £500-1560.
The cost of building and extension depends on several factors, i.e. location, how busy the appropriate trades are, building requirements, special foundation etc. The final cost of the project could comprise: planning costs - from £1,000; shell built costs - from £600 per square metre; fixtures & fitting - from £400 per square metre; and decoration finishing - £10-£15 per square metre.
Home extensions have soared in popularity; brick built extensions can be estimated at £50 per square foot or £500 per square metre. However, you will then have the cost of any new fixtures and fittings on top of that and where you are in the country
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