I typically bill by the area/sqf but there have been times I have done a project for a fixed price.
Phone Call or Home Visit and Then I will get to the design work, and when I feel that I have a good first draft I will start to build it for 3d model and see how its really look. Than its easier for my client to look over the 3d model and decide if they like it. so basically we pick the layout and the material on the 3d design before we start the construction this is how my client dont spend time and money.
I have a degree in Architecture & interior design in "ort braude college of engineering" 7 years of experience designing full interior and exterior homes and commercial . 7 years of work experience and specialize in 3D modeling. also good with Autocad , Photoshop and much more...