I see no reason to not have a Smart Home even in an existing home! Start by determining what tasks you wish to have the system control. Then determine the equipment needed, prepare a "Request For Quotation", receive quotations, select a vender, check their references and enjoy the benefits for years to come.

Another method is to hire a neutral design consultant to reduce your time to perform the above listed tasks. You will benefit by having a well designed system provided and installed by a company that has been reviewed by a professional acting in YOUR best interest.

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There is never a con to hiring a professional to assist with your project. A good, reputable company will provide useful insight for your project and help you make the correct decisions based on your needs and budgets. Additionally, they will be more knowledgeable about products, their proper applications and alternative solutions than trying to research it yourself.

Great home automation companies will be able to interview you for your specific needs, generate a proposal, install and provide service and warranty work if needed. A proper proposal will include equipment, design, install, programming, project management and, of course, user training.