Hi, I am starting my makeover reno of my current 16yrs 4rm flat soon. Just doing makeover for living room and kitchen and has signed with an ID. My ID has shown me all the 3D drawings of her design for my upcoming reno. However, I do not like some of her designs but I do not wish to incur additional cost to my agreed quotation. Can I still ask her to change/alter the designs and will it be chargeable under variation?