Yes! You still need to hire a residential architect, even if you are just extending your home and adding the next story or one more room in the backyard. A professional can make the best use of existing layout to design your spaces in useful ways. They will help you submit the documents to get permission and even design the interiors. If you are looking to contact a residential architect in California, PixelArch is your way to go. They provide all kinds of commercial and residential architectural, interior, and exterior design services. Explore their website now!