Interior design tweaks are easy to do but can add a lot of value to your property. Here are five simple tricks to boost the value of your home by more than £15,000. Clean, bright rooms Painting the walls can give an instant uplift to your house. Choosing the right colour – and the right walls to paint – can add value to your home and help you sell it more quickly. Warm tones make a house feel homely and cosy, whereas paler colours can make a small room feel more spacious. Bright or dynamic tones might be perfect when you’re decorating your own ideal room, but they can be off-putting for a pros…