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Costs depend on factors like size and complexity, and vary region to region. A small and basic do-it-yourself porch project can cost about $5,000 to $10,000, but the budget for even a small porch project can go up quickly when lots of extras are included. Things like lighting, hardware, architectural details and furniture add to the basic cost of the project.
1 A screened porch or sunroom can run anywhere from $500-$1,500 for do-it-yourself materials for a simple project to $10,000-$70,000, depending on the complexity of the project and the location.elated articles: Deck, Sunroom, Bedroom Addition, Home Addition. 1  OneProjectCloser.com explains how to pour a simple do-it-yourself 4x4-foot concrete slab porch using lumber and bags of concrete, with about $50-$120 worth of concrete, lumber and rebar.