Block walls built in the wrong place - what to do

Aliwag

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We're doing a big job on our house - deep retrofit, new layout, large extension, block-built garden room. The garden room is the first thing being built for access reasons and the builders are nearly finished blocking up the walls (started last week). Come to find out yesterday that the walls were all built 10cm in from where they should have been according to the plans so that the whole thing is 20cm narrower and 20cm shorter than it was supposed to be. Now 20cm doesn't sound like much but the effect is that the space will be 10% smaller than planned. It was tight as it was because we wanted to leave as much garden as we could.

What would you do in this situation? The architect just mentioned it fairly casually when we were talking about the roof and sort of said that these things happen and you can't ask somebody to rebuild something for the sake of 10cm. The mistake is with the size of the foundation so rectifying it would require pulling out the walls and the foundation and re-doing, which will cause delays with the whole build as well as costing the builder a good bit of money.

Thoughts? Advice?

Thanks
 
The mistake is with the size of the foundation so rectifying it would require pulling out the walls and the foundation and re-doing, which will cause delays with the whole build as well as costing the builder a good bit of money.
The only person who will pay will be you. Can you live with it? What is the actual measurements of the new room that is now decreasing by 10%?
 
The only person who will pay will be you. Can you live with it? What is the actual measurements of the new room that is now decreasing by 10%?
Why would we pay for the builder to fix his mistake? He has taken responsibility for the error to the foundation size so surely he would have to pay is we wanted it redone?

The space should have been 4.4 x 3.72 (16.37sqm). Block wall to block wall is measuring 4.2 x 3.48 (14.62sqm).
 
Can you be sure similar things won't happen with this builder?
That’s actually one of my big concerns. What if there are similar mistakes with the house extension? To be fair to him, it sounds like it was a simple mathematical error. Once he realised, he told us about it and he’s very apologetic. He didn’t try to keep it from us or anything like that
 
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