Can I sell my house if my extension doesn’t have a building warrant?
Probably, is the best word to start with. If you or a predecessor owning the house have/has carried out building or structural work which has altered the original layout or construction of the house, then whoever did it should have applied for a building warrant from the local authority, and then once the work was finished, a completion certificate, so that the work was certified as safe. Anyone buying a house can insist on all permissions being in place for such alterations. If the work involved changing the exterior or layout of the house, then planning permission may also be needed. Indeed if the house is in a conservation area and/or is a listed building, listed building consent may be needed for both exterior and interior changes.
When commencing the selling process, it is important to check in advance with your GSPC solicitor that titles and other documents such as alterations certificates are all in good order so that no hitches occur during the sale process.
What do I do if a building warrant is missing?
If work has been done and either no certification was sought, or no completion certificate was obtained, then it is possible to seek a letter of comfort from the local authority, which while not the same as the building warrant and completion certificate, certifies that the local authority will not take any enforcement action against the property to undo the works done. There is a fee payable for this letter, and if the works have been done badly or dangerously, the council may still take enforcement action and refuse the letter of comfort.
If planning permission should have been obtained, then it is possible to apply for retrospective permission, but this is usually a more complex procedure. After 4 years of any development being completed ( i.e. without permission) it is no longer necessary to apply for retrospective planning permission.