Chang Wattana Immigration is for the Bangkok City area and surrounding suburbs. Depending on your residece location, can be hard or easy to get to. No point in going over old ground, since all revelent info. has been covered in the post about Chang mai. This particular post may indicate that perhaps not all rules and regs are interpreted the same at all immi branches. or maybe it depends on which side of the bed, your officer got out of. I have just got my 1 year extension stamp based on marriage, including the 30 day result waiting time. For your 1st visit with your spouse, I agree with the other post and take every doc you can lay your hands on, copied and signed. For the last 4 years, we have been fortunate to see the same lady officer each time. She quickly swept through all the stuff, then chatted to Mrs Sky. mentioning that she was sorry for those dealing with the 30 day extension crowd. And no wonder looking at some of the individuals there. She of course was fully self aware that she looked damned good in her tailored uniform with knife edge creases. Certain requirements for the extension may differ from Chang mai, for eg. Prior to application, the 400k is required for 2 mth, not 3. Unless its your first app. Bank letter,[100bt] must be done the same day as app. easy at CW. Most banks have branches on basement floor with other shops etc. if residing at present address for over 3 years, no map or visit needed. Original marriage docs not needed, only copies. 5 pics required. Both of you in each. 1 Outside house, showing number. 2 By your gate also showing number. 3 Kitchen. 4 Living room. 5 Bedroom, sitting on bed, showing open wardrobe door, with his and her clothes. Our friendly officer was shaking her head at no 5. 'But its the rules' she said. Waiting time ...1 hr....Time with officer...15min. including chat.