What documents and forms do I need for a Non-O retirement visa extension and multiple entry visa in Thailand?

As we don't know where you're going to apply it is hard to tell what documents you need for the Extension of Stay, this is the list of Bangkok, but can differ at any other Immigration Office: Application Form TM 7

1 Passport picture

Copy Id page passport

Copies of visa in passport

Copy Admitted to Stay stamp

Copy TM 6 Departure card

Hand drawn map of area of the house

When using bank:

Bank letter (max 7 days old)

Copy Bank book first page

Copy Bank book last pages with 2 months history for first application or 3 months consecutive application.Minimum balance 800.000 Thb

When using income:

Affadavit from Embassy minimum income 65.000 Thb a month

When using combination

Bank letter (max 7 days old)

Copy Bank book first page

Copy Bank book last pages with 2 months history for first application or 3 months consecutive application, combination must be minimum 800.000 Thb

Affadavit from Embassy

Copy Lease Agreement

Singed copy ID landlord front+back

Signed copy House book landlord

Fee 1.900 Thb

For the Re-Entry Permit is the the TM 8 Form.

For the Extension of Stay it is the TM 7 Application Form.