What is the procedure to extend an exemption visa by 30 days in Pattaya, Thailand?

A French expat inquiring about extending their exemption visa by 30 days in Pattaya can apply for an extension at the local immigration office before their current entry stamp expires. The process costs 1900 baht and it's recommended to visit the office during the week prior to the expiration date. It's important to bring documentation such as the TM30 form showing proof of accommodation. The visa extension procedure has remained consistent, even during changes due to COVID-19.