@Paul ***********
It depends on your immigration office. MOST offices require the following:
1. Paperwork that you get at the local immigration office
2. Your passport, and copies of
a. Your data ("picture") page
b. Your last visa page
c. Your last entry stamp
d. Your last extension of stay stamp
e. Your departure card
3. 2x passport pictures
4. Your most recent TM30
5. 1,900 THB.
HOWEVER...
SOME immigration offices want to see copies of all pages of your passport.
SOME immigration offices want to see the ID of the property owner.