Planning permissions are more likely to be refused when it comes to Listed Buildings or Conservation Areas because of the increase in policy restrictions, and if the proposal does not consider factors of design to be in-keeping and sensitive, the Local Planning Authority are well within their rights to refuse the proposal. The purpose of listing a building or creating a Conservation Area is to protect what exists there and preserve the historical, traditional architectural quirks for the future- anything seem to harm or detract from this is likely to be refused.