216Improvement notice: contents.
(1)An improvement notice shall—
(a)specify the works which in the opinion of the local housing authority are required to improve the dwelling to the full standard or, as the case may be, to the reduced standard,
(b)state the authority’s estimate of the cost of carrying out the works, and
(c)require the person having control of the dwelling to carry out the works to the authority’s satisfaction within the period of twelve months beginning with the date on which the notice becomes operative or such longer period as the authority may by permission in writing from time to time allow.
(2)The works specified in the improvement notice may be different from the works specified in the provisional notice but shall not require the improvement of a dwelling to the full standard if the provisional notice specified works for improving the dwelling only to the reduced standard.
(3)In an improvement notice which requires the improvement of a dwelling only to the reduced standard the authority may, if they think fit, substitute for the period of twelve months specified in subsection (1)(c) such shorter period as appears to them to be appropriate.