A hole in a fitted carpet can be effectively repaired by fitting a piece cut from an identical carpet. Using a trimming knife and working from the back of the carpet. Cut out a neat square around the damaged area, and cut a replacement patch that fits the square exactly.
Spread a white rubber latex adhesive halfway up the edges of both the patch and the cut-out section to stop the edges from fraying. Allow at least half an hour for the adhesive to dry. Then cut out a piece of hessian. Or coarse sacking, that is 25mm 1 in larger all round than the size of the hole. Tuck the hessian under the hole and apply rubber latex to the exposed surface. Add a further thin coating around the edge of the hole. Alternatively, use a 50mm 2in square of self-adhesive linen tape – adhesive face up – as the base for the repair. Insert the patch in position and hammer it down firmly with a block of wood.