Before You Build in Wilmington, DE: Permit & Rule Checklist (2026)

Fence installation in Wilmington typically requires a permit from the Department of Licenses and Inspections, especially for fences above a minimum height.

Wilmington fence height limits are set by zoning district. Typical residential limits are 4 feet in front yards and 6 feet in side and rear yards.

Wilmington follows Delaware's common law rules on boundary fences. Neighbors share maintenance responsibility for true boundary fences; disputes may be resolved through civil court.

Residential swimming pools in Wilmington require a building permit from the Department of Licenses and Inspections and must comply with the Delaware State Building Code (ICC IRC, including the IRC residential pool barrier provisions). Pool barriers must be at least 48 inches high with self-closing, self-latching gates that open outward away from the pool.

All swimming pools in Wilmington must be enclosed by a 48-inch minimum barrier fence with self-closing, self-latching gates, per Delaware building code requirements.

Swimming pools in Wilmington require building permits and must meet all safety standards in the adopted building codes. Pool equipment must be properly installed and maintained.

Above-ground pools in Wilmington require permits if they exceed 24 inches in depth. They must meet the same fencing and safety requirements as in-ground pools.

Accessory dwelling units (ADUs) in Wilmington are subject to zoning review under Ch. 48. The city has been updating rules to allow more infill housing, but ADUs require permits and must meet zoning standards.

Converting a garage to living space in Wilmington requires building and possibly zoning permits. The conversion must meet all habitability and building code standards.

Sheds in Wilmington require permits if they exceed a certain square footage. Small utility sheds may be exempt. Sheds must comply with rear/side yard setbacks.

Carports in Wilmington are accessory structures regulated under City Code Chapter 48 (Zoning) and require a building permit from the Department of Licenses and Inspections. They must meet the underlying residential district setbacks and lot-coverage limits, and open sides may be required for the structure to be classified as a carport rather than a garage.

Delaware does not preempt local tiny-home rules, and Wilmington's City Code Chapter 48 (Zoning) treats dwellings under the standard residential district bulk regulations - there is no separate 'tiny home' use category. Any permanent dwelling must meet the minimum lot, yard, height, and floor-area standards of its zoning district and comply with the Delaware State Building Code (ICC IRC family).

Outdoor burning in Wilmington is regulated by the Fire Marshal's Office. Open burning is generally restricted in urban areas and subject to air quality regulations.

Recreational fire pits in Wilmington must comply with Fire Marshal regulations. Given the city's dense urban character, outdoor fires require permission and must meet safety clearances.

Wilmington water use restrictions are issued as needed during drought conditions. The city's water is supplied by United Water Delaware; mandatory restrictions are declared by the utility or city during dry periods.

Property owners in Wilmington are responsible for trimming trees on their property to prevent public nuisances. Street trees are managed by the city.

Removing trees in Wilmington may require permits, especially for street trees or in historic districts. Property owners are responsible for safe removal of hazardous trees.