Can I renew my Non-Immigrant B visa in Penang or at the Chaeng Wattana office instead of doing border runs?

If your company can provide all documents that are necessary to get an extension at an immigration office (because required documents are different from getting new non-B at Thai consulate), then you also can do 90 days report at immigration office instead of border runs after you get 1 year extention.

If the company cannot meet criteria for you to get extension inside the country, then you need to get Non-B multiple from Penang or Kota Bharu (as far as I know only two are issuing Non-B multi to foreigners - company directors - around S/E Asia). In that case, you cannot do 90 days report at an immigration office and you need to get out and in Thailand every 90 days.

Agree with John. Get an annual extension at Chaengwattana.

Instead of renewing your visa outside the country every 90 days, why don’t you just apply for a one-year extension at your local office?