Can I extend my 60-day visa on entry by 30 days at Chamchuri Square immigration?

The user inquired about the possibility of extending their 60-day visa on entry by 30 days at the Chamchuri Square immigration office, given their status as a UK citizen with a Thai wife and children. A comment clarified that a 30-day tourism extension can be applied for at the IT Square Laksi Plaza if the entry stamp has 45 days or less remaining, but that the Chamchuri Square office does not process tourist extension applications.