What requires a permit, what is exempt, and how North Carolina's building code applies to outdoor living projects in Concord, Harrisburg, Kannapolis, and Mount Pleasant. Reviewed August 2026.
North Carolina's residential code sets the baseline: decks more than 30 inches above grade require a building permit, as do roofed structures, attached work, and pools over 24 inches deep — with the 48-inch barrier and self-latching gate rules attached. NC's 12-foot rule is the quiet exemption: a detached accessory structure with no dimension over 12 feet needs only a zoning permit. Cabarrus County's building office serves the unincorporated county, while Concord, Kannapolis, and Harrisburg run their own — the parcel decides which one, and newer developments add HOA architectural review alongside.
At-grade paver and concrete patios are generally exempt from building permits — zoning setbacks, HOA review, and drainage still apply, and on expansive Piedmont clay, base preparation and water management are what keep hardscape flat. Retaining walls above roughly four feet require engineering and a permit.
Decks more than 30 inches above grade require a permit and inspections — footings, ledger attachment, and guardrails. A detached structure with every dimension at 12 feet or less needs only a zoning permit; go past 12 feet in any direction, or add electrical, gas, or a motorized louvered roof, and it becomes permitted, engineered work. Allscape submits stamped engineering with every motorized pergola application.
The short version of the rules for the three most common outdoor living projects. Confirm specifics with the county or your city — requirements are finalized at plan review.
No building permit for at-grade flatwork in most cases. Zoning, HOA review, and drainage apply. Retaining walls above roughly four feet need engineering and a permit.
Deck over 30 inches: permit required. Detached structure with no dimension over 12 feet: zoning permit only. Roofed, attached, or motorized structures: permitted, engineered work.
Pool over 24 inches deep: permit, 48-inch barrier with self-latching gates, and electrical inspection including equipotential bonding of metal near the water.
Cabarrus County including Concord, Harrisburg, Kannapolis, Mount Pleasant, and Midland — the northeast side of the Charlotte metro. Allscape confirms the right permit office and any HOA requirements before submission.
