Reliable And Honest Contractor For Bang Na Work

We have a problem in Bang Na with an add-on kitchen for which the foundation is settling. A sizeable crack has resulted where the add-on is separating from the main house.

An architect friend has done some drawings for us that should stabilize the settling. It involves temporarily hoding up the kitchen while excavating, then backfilling underneath, and pouring a couple of pad footings.

Can anyone make a recommendation of someone who has capably done similar work?

Thanks in advance.