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Answer: when your project is sufficiently complex with not only the area involved, but the multiple components involved such as hardscape, softscape, irrigation and grading. If the project is straightforward like replacing an old ugly concrete driveway with new pavers, you probably don't need a design or any plans drawn. In this case, you are probably looking to get a free estimate since the square footage is known and you have selected the exact material to be used.
Who should prepare the design?
Answer: Someone who is capable of drawing a plan to scale and calculating materials and quantities while at the same time convey what the design will look like when finished. In addition, a plan that is required by a Homeowners Association or to obtain a building permit should be prepared by a qualified professional.
source : https://www.fsqdesignbuild.co.uk/