Community approval required for extensions

We have experienced an issue regarding an owner trying to sell their property. Any extension requires the approval of the community governing body but it is clear that there may have been cases in the past where such approval has not been asked for and therefore not granted. If and when this becomes an issue during the normal legal searches associated with a house sale the committee has decided it will sanction approval retrospectively where appropriate. This only applies to temporary structures such as conservatories and not to permanent structures which extend agreed building lines.