as Brandon says... But I'll add.. Before commencing.. Get a 'Bill of Quantities' this details everything thats included in build and itemises the costs of each item.. For example the cost if each sqm of tiling.. Materials and labour.
The more details in this agreement, the less confrontation you will have.. A good reputable builder with have no problem with it.. The others hate it and will discourage it.. Because they know they can add.. And add.. And add.. As it goes along'
And... Take charge, don't let them deal with your wife.. Keep her out of it! The builders know that ladies won't want to have confrontation with 'senior professional male' and use this to their obvious advantage to push things through..
Dont buy ay airport, buy ordinary sim and analyse the available deals on the app.. Go for what's needed or just below, you get bombarded with deals when your limits are near.
nobody in Thailand know's anything, so how does tour UK accountants? If anything without experience of Thailands governments... 'idiosyncrasies' they probably have even less relevance?