I'm still waiting on delivery of Christmas cards from the UK

Like the above comments states... Come into Thailand on a tourist visa then proceed once here

No need to buy a plane ticket, book a bus to loas from Udon Thani

Ask at the immigration office

My immigration office is also Pathum Thani.. I can only info you of my dealings with Pathum Thani.

4 year's ago I wanted to change from O imm retirement visa to married visa.

Can not was the reply from immigration, they told me I had to leave Thailand and have my retirement O imm canceled then re-enter and apply for a new O imm based on married.

So I booked a flight to loas and came in on a 30 tourist visa.

The is a list of the Documents I needed visa based on Marriage

Please note: For First extension you may need witnesses, ask your Immigration.

Money in the Bank, but you could use a savings account as well as long as the money (400K) is in the account at least 2 months.

1) TM 7 Immigration Form

Photo Size 4x6 (2 x) to stick on TM 7

2) Copy Passport

Copy Face Page

Copy last Non – O

Copy Last Entry Stamp into Thailand

Copy Last Extension of Stay

Copy TM 6 Departure Card

Copy last 90 day report

3) Copy Yellow House Book Husband + Original

4) Copy Marriage Certificate (Khor Ror 3) + Original

5) NEW Marriage Certification (Khor Ror 2) obtainable from Amphur

6) Copy ID Card Wife + Original

7) Copy Tabien Baan Wife + Original

8- Family Photos (must be in Color)

1.Couple sitting on Bed

2. In kitchen

3. Sitting at table

.4 outside with House Number clearly visible

5. sitting on sofa

6. sitting outside House (near front door)

9) Hand drawn Map to the House (Complete with GPS Coordinates)

10) Bank Book Fixed Deposit from Bank on day of visit to Immigration

Transfer some amount to Fixed Deposit account on day of Extension

Update Bank Book @Bank Branch

Bank letter Fixed Deposit obtainable from Bank

Copy First Page (Name)

Copy other relevant Pages

Everything Double Copy

Straight forward then ☺️

When I done my last extension on day 30 I had to phone immigration to see if they had the extension ok from Bangkok... took 45 days in total that was Pathum Thani immigration.

Thai visa service. Google is your friend. From Bangkok few times a week, very reliable and professional company