16. Although there is no positive rule of law on the subject, an incumbent should, as a matter of prudence, obtain a faculty, or at any rate the written consent of the bishop and patron, before making any substantial alteration in the parsonage house or other buildings of the benefice. If he fails to do so, he proceeds at the risk of himself and his estate; and if his action is afterwards challenged, it will lie upon him or his executors to prove that it was justifiable.[362] The precaution should never be omitted in the case of removing a building without erecting another in its place. With regard to any building belonging to or forming part of a parsonage house which appears to be unnecessary, the bishop, on the application of the incumbent, and with the written consent of the patron, is expressly empowered to authorise its removal; and any net proceeds of the removal will be applied to the improvement of the benefice in such manner as the bishop and patron may agree.[363] The foregoing remarks do not apply to structures such as movable sheds or garden frames, which are not regarded in law as affixed to the soil and therefore hereditaments like the land on which they stand, nor to fancy structures with which the succeeding incumbents ought not to be burdened.[364] 17. Upon the vacation of a benefice, the incumbent or his estate ceases to be entitled to the income and house of residence of the benefice. But on the death of a married incumbent who was at the time occupying the house of residence, his widow has a right to remain in occupation for two months after his death;[365] and in every case, until the question of dilapidations is settled, the late incumbent or his executors or administrators may, at reasonable hours, with a surveyor, enter upon the premises of the vacated benefice.[366] If the vacancy occurs otherwise than by resignation, the late incumbent or his executors or administrators have a right to emblements, that is to say, to reap and enjoy any crops which he sowed before the vacancy occurred but which have not ripened until afterwards.[367] Where, however, the glebe land is not cultivated by the incumbent himself, but is let to tenants, the current rents are in all cases apportionable between the late incumbent, or his estate, and the new incumbent, up to and from the date of the occurrence of the vacancy; and the same rule applies to tithe rentcharge and to any other income from endowments.[368] Subject to these rights and to provision being made out of the revenue of the benefice for the service of the cure during the vacancy,[369] the new incumbent, on his admission, becomes entitled to the temporalities of the benefice as from the date when the vacancy took place.