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That is totally correct. We had plans drawn for an extension and the architect drew it as we wanted it. Then the builder mentioned that the doors on the plan were £4000 more expensive that normal doors. We changed the doors!
If I was doing it again, I would have the builder, the architect and ourselves around a table to get the plans agreed.
The architect specified a steel beam which was a nightmare to install, the builder had to comply with the plans for it but said it could have been done is a much easier way for him with no loss of strength. The things you learn ...
I found that too - architects apparently have no concept of what things actually cost, which is odd, as its part of their job.