Are the following sentences well structured?
We are expecting our engineer on site in the morning to investigate the pipe noise in the building.
We require access to your flat so that he can run your water outlets to determine the possible cause.
Are you happy for us to use your spare key from the concierge's office?
We look forward to receiving your response.
Yes, they are all OK. ) You could consider stating or confirming the day/date of "the morning".
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Yes, they are all OK. (I wouldn't start a new paragraph for each sentence, but perhaps that is not your intention in the final text.)
You could consider stating or confirming the day/date of "the morning".
GPY has already mentioned that your sentences are good. I will rephrase your sentences slightly so that they seem more natural to my ear.
Goldenboy1We are expecting our engineer on site in the morning to investigate the pipe noise in the building.
We are expecting our engineer on site in the morning to investig