Find A Considerate One
I understand that getting a designer can be more expensive but you see in the end, you might be thankful because it’s all worth it. Their expertise and their opinion can make your house so impressive. But of course find a considerate one; find a person who loves their job more than aiming of the amount that you can give. Find someone who is willing to go extra mile and push their limits over boundaries.
If you can’t afford a professional one then check your neighbors or friends who have the idea or talent to come up with a nice extension design. A simple chat with them can go a long way, ask of their opinions about the designs, the reason why you like it that way I am sure that they would answer right away, they can even give you tips or advise which one is the best construction design in town.