Noob Vientiane SETV update. It's still user friendly. No proofs required.
- two 3.5x4.5 pictures
- copy of main passport page
- copy of Lao stamp page (probably also copy of Lao visa if you have one)
- application form
- 1000 baht for pick up
I went to apply on Friday around 11 am. Absolutely no people there. Got number 79. Went back Monday at 1:30. 80 numbers took exactly 25 minutes.
Oh, and remember it's the consulate. NOT the embassy. Google maps don't quite understand that.
Also, I think Vientiane is an awesome place to chill for a while. Stayed six days and really enjoyed it.
TLDR : Answer Summary
The process of applying for a SETV (Single Entry Tourist Visa) at the Thai Consulate in Vientiane is user-friendly and does not require extensive documentation. Applicants need to provide two passport-size photos, a copy of their main passport page, a copy of their Lao stamp page (and possibly a visa if applicable), the completed application form, and a fee of 1000 baht for pickup. The author experienced a quick application process with minimal wait times and enjoyed their stay in Vientiane.