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Deck
A deck is a raised uncovered platform that is attached to a dwelling. A deck will generally require a building permit, and will require protective guards if it has a walking surface greater than 24" above grade.
Porch
A porch is a covered structure that usually forms part of the entrance of a dwelling. It may be enclosed or unenclosed. Any porch requires a building permit and will require protective guards if it has a walking surface greater than 24" above grade.
Patio
A patio is an uncovered platform at grade level that is usually constructed of concrete or stone. A patio generally does not require a building permit, unless it interferes with an existing structure.