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Structural Calculations - Who is responsible for the accurate measurement?

Anonymous user 15/03/2024 - 2.30 PM

Hi All, I am in the midst of removing 1 load bearing wall (lounge/dining) and one potentially non-load bearing wall that goes from ground floor all the way up to the first floor (dining/kitchen). My house is a typical 3 bed 1930s semi-detached. I commissioned a structural engineer and he recommended a picture/box frame solution for the lounge/dining wall and a RSJ beam for the dining/kitchen wall tied to the box frame. It seems like a fair recommendation although I have to shell out more money for the box frame. However, my query is with regards to the measurements and drawings. I assume the measurements provided by the structural engineer should be accurate so that I can forward it to the steel fabricators. But it seems that he said the onus is on the builders to measure it again. Being OCD about my first property, I made took my own measurements. The steel posts of the frame is too long and the beam for dining/kitchen wall is too short. Question is, who is ultimately responsible for these calculations?