@Luke *********
The options available to stay in Thailand depends on your purpose in Thailand. Generally, the following common visas/ extension of stays are acquired by people wanting to stay in Thailand. :
- Non-O Visa/ Extension of stay based on marriage to a Thai national
- Non-B Visa/ Extension of stay based on employment
- Non-O Visa/ Extension of stay based on being over 50 ("retirement)
- Non-O Visa/ Extension of stay based on raising half-Thai child
- Non-ED visa/ Extension of stay based on studying
- Elite Thai visa (5 years to 20 years, price starts at 600K THB)
- BOI Investment visa (starts at 20M THB, if my memory serves me right)
If you have further questions about the process on acquiring these visas/ extension of stays, please make your own post