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Thank you. Are steel supports a lot more expensive? Any rough idea on costs?

Thanks for the replies. The calcs say 330mm each side. However builder is calculating this from the inside wall of the extension (which is not in line with existing house as party wall prevented this) and then adding the engineering bricks (a brick and a half) onto this further. So the length...

Sorry, wasn't sure where to put this. Thanks for your reply.

morning all, I haven't slept all night! We are are having a rear extension done and the builders have knocked through existing wall and just put in the last load bearing RSJ where we expected piers to stick out 225mm in our house. Well in fact the party wall side sticks out approximately...