Yes, I was just coming to that point. The noble Lord, Lord Stunell, raised the issue of costs. Research by the Zero Carbon Hub indicates that, for an average semi-detached home, the lowest cost of meeting the proposed standard would add almost that sum of £3,000 to the construction costs. Originally we thought it would be £10,000—indeed, I think that figure was mentioned by somebody in this debate.
The new clause proposed by the noble Baroness, Lady Parminter, would increase the bill cost for all housebuilders, irrespective of their size. With regard to small builders, the availability of small sites is declining and extra regulatory costs would impact on the viability of these developments, leading to even fewer small sites.