Here are some things to consider when selecting your residential designer or architect.
1. Never select one based purely on price alone.
Whether it’s the low priced or the high priced firm. The low guy will most likely not give you the best set of plans. Remember you can not pay a little and get a lot but sometimes you can pay a lot and get a little. The high priced firm might not give the best value for your money. You might be paying for name recognition.
2. Always ask to see examples of their construction documents.
Take note on how many sheets and how detailed the plans are and mentally compare between 2 or 3 other firms. Are the plans neat and readable? Do the plans have enough wall sections and details? Plans that do not have sufficient details will cost you money during construction.
3. Ask for a list of past clients.
Contact both individuals and general contractors that have worked with the firm in the past. Ask them if there were any problems with the plans and if they would work with them again.
A Better Plan's Space 
I like use my own idea concept to my new home ,thanks for help us how to choose the firms and plan
You are welcome