Moving within Thailand - renew extension at new IO. Saraburi info, anyone?

[isaanistical]

I am moving to Saraburi (changwat, not town) and would welcome any useful info on dealing with the IO there. I  have extended my marriage visa several times in BKK but

 

1. any problems 'changing' changwat? Does it mean a complete new application?

2. any input as to an agent who may be able to help?

 

I have never used or needed an agent before but there are some issues this time where one may help, so spare the good idea/bad idea opinions please.

 

But: if anyone has info on an agent in S'buri who is any good, a PM would be very much appreciated. Ta.

[DrJack54]

OP, file a TM30 (change of address) 

Then when your next annual extension is due, do it as normal at your new immigration office.