Dear Committee. In January I want to do some renovation to my room kha. Now windows are leaking water and the rain damage wooden floor tile. Also leaking in bathroom create mould to grow on tiles - this is unhealthy na kha. So I will renovate bedroom & bathroom. Contractor can start on 11 January. Khun Aew, please let me know rules & procedure for contractor to work onsite at GC building kha. Anybody have any concern, please ask me kha. Thank you.