cabletie

Hi all, Just a survey, do you guys/gals pay for extra things that your renovator do for you without your consent? examples: 1) Quotation says 12 feet cabinet, but end up become like 14feet. 2) Quotation says no window grills for a particular window, but end up having grills for that. Do u pay for these extra works?

I had some hollow homogenous tiles, was thinking of not replacing them as it will make the place dirty again. Is it ok? Will it eventually pops out? or what are the risks? anyone got any real life experience?