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Carport And First Floor Extension Cost. A standard garage conversion, however, should cost between £4,995 and £7,500. For example, a brand new three by four metre extension could cost upwards of £17,000.
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As well as the floor area, the cost depends on the design and materials. It is always best that you discuss your options with a professional builder like cameron construction who specialise in extensions and renovations and will minimise the risk of costly mistakes. We also recommend that you contact our website sponsors for further information.
Structural changes and building costs
There a few factors that will affect your cost such as the quality of your inclusions and chosen construction. The upper floor will be about 28 square metres. It could even be more if you consider demolishing parts of it to make room for the new floor and wall designs. So, £30,000 +50% = £45,000 for the basic build cost.
