The cost of a project always depends on its type and scale. For house extensions the cost is based on its dimensions, generally the larger your extension, the less it will cost per square meter due to economies of scale. Painting is a relatively quick and simple low-cost home improvement. A new coat of paint can transform any property however, before applying paint we need to make sure that the surfaces are smooth and even. This means any holes, dents, bumps or scratches need to be covered with plaster before applying a new coat of paint.