If it appears to a local authority—
the authority shall, by notice to the owner of the building, require him to provide the building with such closets or additional closets, or such substituted closets, being in each case either water-closets or earth-closets, as may be necessary.
Unless a sufficient water supply and sewer are available, the authority shall not require the provision of a water-closet except in substitution for an existing water-closet.
Sections 99 and 102 below apply in relation to a notice given under subsection (1) above.
Among the grounds on which an appeal may be brought under section 102 below against such a notice is that—
Where the grounds on which an appeal under section 102 below is brought include the ground specified in subsection (4) above—
This section does not apply to—