No. The gas connection is made with limited disturbance to the outside of your home and any holes dug will be replaced and made good. The central heating install will require pipes to installed in your home and may require carpets to be lifted. This will be discussed at the survey.
See the photographs below from Staffordshire Warmer Homes, another Warm Homes Fund scheme based in Staffordshire, which shows the property and surrounding area during and after the works took place.