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I could have benefited from this in the construction of our house. Riddled with inaccuracies, the engineer signed off on the foundations, but we found out when the walls were up that the builders used the internal dimensions as exterior dimensions. So our house is smaller by ~250mm on each side.

We had to make so many compromises and wastages as a result. Bathrooms now smaller if we want to keep other rooms the same, bathtubs couldn't fit, aw man.

Then when the house went up to 2nd and 3rd levels, the staircase was narrow and wasn't connecting between the levels. That alone delayed us by 3 months as we had to get the architect to build a 3D model of the affected area so we could figure it out. We have to hoist furniture up through balconies as it can't fit through the stairs.

I think having some machinery that minimises human error would be very helpful.

I am an architect who worked as a contractor and as a consultant and I made an account here just to comment on this.

When you found out the builders did that, what you should have done is stopped the work and have them correct their mistake on their own dime. This is an unforgivable mistake and a team of professional should never make something like that.

Obviously I am not in your shoes, but this is insane to me. Any supervisor or consultant or surveyor visiting the site should've caught that.

We discovered/noticed this when the exterior walls were 2 meters high. They had to move around interior walls but that didn't help much.

My wife and I concluded that we got what we paid for, and you're right that in hindsight we should have taken legal action against the contractor. I don't know how breaking down the whole exterior of a house to fix it down to the foundation would feel though. At some point we thought of selling the partially completed structure.