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Worth discussing with the engineer how changes will be dealt with. E.g. architect specifies opening size, engineer says it can't be done without [thing]. So now you have to pay architect to do more work, then pay engineer again to redo their bit.
Architect and engineer involved will be able to tell you more but my point is that the engineer fee is not going to get lower, and could quite reasonably go up, perhaps up to an order of magnitude more if weird or unexpected stuff comes up.
@sumo the fee you've been quoted is so incredibly cheap that it'll all get used up if for example the structural engineer needs to have a meeting with your architect for any reason. Read the conditions to see what's excluded and included, e.g. as mentioned above are they going to charge extra for doing stuff that you need in order to finish the project. The quote would be cheap even for a single visit with input limited to verbal advice only