The cost of a small loft conversion in the UK generally ranges from £20,000 to £35,000, depending on factors like the size of the loft, design complexity, and materials used. Simple designs such as a Velux conversion tend to be more affordable, while dormer or hip-to-gable conversions can increase the price. Investing in a small loft conversion not only adds valuable living space but can also boost the overall market value of your home.