The criteria are that the claimant owns the dwellinghouse to which the claim relates; and—
(a) the dwellinghouse is part of a multi-unit complex; and
(b) that complex is not a stand-alone complex; and
(c) the dwellinghouse was built (or alterations giving rise to the claim were made to it) before 1 January 2012 and within the period of 10 years immediately before the day on which the claim is brought; and
(d) water has penetrated the complex because of some aspect of its design, construction, or alteration, or of materials used in its construction or alteration; and
(e) the penetration of water—
(i) has caused damage to the dwellinghouse; but
(ii) has not caused damage to any other part of the complex.