What steps do I need to take to extend my non-immigrant spouse visa in Thailand after marrying a Thai woman in Sweden?

Does her Thai husband know you are coming ?

Legalisation of Swedish Marriage Certificate for the local District Office (Amphur in the Provinces or Khet in Bangkok) in Thailand

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You must legalize the Swedish marriage certificate at the Swedish ministry for Foreign affairs. After that you must legalize it at the Thai Embassy in Sweden. In Thailand you must get a Thai translation and then have it leagalized at the Thai Ministry of Foreign affairs. For that you need a copy of the Tabien Baan (blue book) of the house where your wife is registered. You also need a copy of your passport with entry stamp and a signed copy of the Thai ID-card of your wife.

You must register the legalized document at the Amphoe of the region of the house. You will get a Kor Ror 3 + Kor Ror 2 or 22 from the Ampoe, which you will need when extending your non-immigrant visa.

Of course you also need to comply to all the requirements for the extension of your visa. Most important ones: the financial requirements and a TM30, that must be registered within 24 hours after your arrival in Thailand. That will probably a hotel, but when arriving at the house you will live, a new TM30 must be registered within 24 hours after your arrival. That can be done online, see

tm30.immigration.go.th

So, be well prepared. If not, your extention will probably be denied.