Your house will almost certainly be more attractive to buyers with some general sprucing up and cleaning. Larger projects such as loft conversions, converting a garage or adding a conservatory may reap high rewards if you have the time and money. But small things can make a surprising difference too.

Source: Propertymark

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http://propertymark.co.uk/advice-and-guides/selling-your-home/add-value-to-your-home-before-selling/