It is important to visit the site before starting any interior design.  Also, we have to visit the site and take measurement in the whole place and do exact drawing accordingly.  Measurement is an important factor in interior design, if measurement and drawing can be done properly then it is easy to find out the cost.  Also, if we can find out the cost according to the measurement of the material, the work can be done at low cost and waste will be less.  Also, when designing the interior, we must give importance to the client's choice and try to understand their needs, then it will be possible to design according to the client's choice. 

Also in the case of interior design, the quality of the materials, the type of materials and its durability, color selection should be given importance.