Good question Norton especially as I previously said...wall at the end and it was mentioned that wall at the start might be 'unlucky'
SWMBO said she not heard of the luck aspect and builder was keen because of security. Probably to keep his troops on the job too.
If you look at clause 54 of the contract he is responsible for securing all equipment and materials so hes got an interest in makimg the site secure.
Suits me too.