Question for builders

[shysarah]

We’re having an extension built on the back of the house that will extend the current kitchen diner. We’re having the new window and doors surveyed by a window company on 28.7 and our builder has said today that he won’t be knocking through to the kitchen until the window and door have been fitted. That could be weeks away.
We thought that they would knock through once the new roof is on the extension and block up the window and door somehow.
Are we being naive?