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A building permit is often required for outdoor kitchens, retaining walls over 4′ high, or sometimes for a concrete patio. Some municipalities have different requirements for paver patios vs. poured concrete slab or stamped concrete patios.
A building permit will typically require more documentation on the construction methods. If a retaining wall exceeds 4′ in height, they may require stamped drawings from an engineer, documentation or case studies from the manufacturer of the retaining wall block being used, or both. The cost is usually a fixed base fee, plus a fee based on the cost of the project.
Inspections are often required at multiple steps in the construction process. A list of inspections may include footer trench, base, geo-grid, and final inspections.