No matter the project, if the goal is an economical design and the assurance that the building will actually work as intended, you should retain the services of a reputable architect and engineer. The relatively small price for quality design is money well spent..
I've seen many well intentioned but seriously misguided souls willing to invest millions in their project, who believe they'll "save money" by having their nephew who took high school drafting draw the plans and then hiring the cheapest engineer they can find.
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For more on why cheap engineering is not cheap, click here.
