I swear to GOD. I'm just giving my opinion, not promoting anything. Neither am I an interior designer.
These are all my experience when I accompanied my sis and mom for quotation regarding about their house renovation. My mom signed up with contractor as the price is cheap. Design and materials used, overall turn out to be cheapo. But luckily, my mom's house is HDB flat so still not so bad. Renovation period is chaotic, rubbish and other materials lying everywhere. The contractors also smoke as they are working. Contact the contractors for touch up of some areas, they always said that they are not free to drop by. If not, they will said ok, but didn't turn up.
As for my sis, she signed up with an interior designer recommended by her friend. This interior designer is so detailed, she will give suggestions and voice out if the things which my sis wanted is out of the design or porportion. On site measurement, the interior designer also pointed out things to take note or needed for the previous owner to touch up before the commencement of renovation. Some walls and ceiling have stains on them, the interior designer commended that they are stain marks of water/rain leaking in. The previous owner is so smart, he painted the affected areas with thick, fresh coat of paint to cover up. Luckily, my sis's interior designer pointed out the problems. Can you imaging how bad it will be if it's discover after the renovation. The materials and rubbish are on the floor in a orderly manner. The workers also clear the rubbish at the end of the day of work. They also smoke, but they smoke at the yard area and throw their cigarette butts in the rubbish bag.
See ... You guys can't blame me for praising the interior designer for doing such a good job.