Price for interior designs is really subjective. However, most of the time the younger/inexperience ones will charge cheaper and more established ones will charge more expensive (just like buying a pair of NIKE shoes). However, that doesn't mean the designs from the more established ones suits you. Every designer has their own style. Even in the same designer firm, different designers have different style. So I agree to one of the LYN members who said....choose the style you like most and bargain.

I also agree to eleganz concept who mentioned that some interior designers may design something which is not practical, whether or not they are established. if you are getting the design from a designer and source another contractor to do it, perhaps you can get the contractor to look at the design and tell you upfront if it's not practical, and perhaps you can try to negotiate with your designer to amend.

If you are getting the sub-con from the interior designer, then you would save your headaches as the interior designer is responsible to make his/her drawings to reality.

There is no specific % that an interior designer will earn. So just follow the design style that you like, get that particular designer and try to bargain till your budget.

Good luck!