How much it would cost approcimately to add extra gas pipe in the kitchen ? ?

Recently I bought a a house, which has Gas boiler installed in the kitchen. But there is no gas cooker point. All the gas pipes are outside on the wall. The previous owner told me that it is easier to add extra gas pipe if the pipes are outside on the wall(instead of under the floor). She has also told that, she had gas cooker in the past, but there was some gas leak once, so she has got all the pipes re-installed. At the time of re-installation the pipe to the cooker point was removed, as she went for electric cooker. Now, we want to add extra pipe to the cooker point. How much it would cost approximately? Thank you for your help.