Search online for architects websites and see if there is one that you like.
Search in Real Life for a house you like and discover who the architect was.
Don't ever appoint your architect based on the geographical location of his office.
The fees will usually reflect the scale and complexity of the building.
You have posted no information on which to base the advice you sought.
FWIW
ONQ.
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All advice on AAM is remote from the situation and cannot be relied upon as a defence or support - in and of itself - should legal action be taken.
Competent legal and building professionals should be asked to advise in Real Life with rights to inspect and issue reports on the matters at hand.