Building Safety in Delaware (2026)
36 rules on the books across Delaware, 4 cities and counties. Select a rule to read the full details.
Severity: Few Restrictions · Light Restrictions · Some Restrictions · Significant Restrictions · Heavy Restrictions
Lead Paint
Local lead-paint rules for older housing, hazard abatement orders, inspection triggers, and how local requirements sit alongside the federal disclosure and RRP rules.
Sussex County
Heavy RestrictionsSussex County's Housing Code bans lead-based paint with more than 0.5% lead content from any interior or exterior…
Read full rule →Wilmington
Significant RestrictionsWilmington orders lead paint removed from rental interiors whenever a rental inspection or tenant complaint finds it…
Read full rule →New Castle County
Some RestrictionsLandlords must hand every tenant the county's Tenants' Rights Guide at lease signing; its Lead Paint section flags…
Read full rule →Elevator Maintenance
Inspection schedules, maintenance requirements, and safety certifications for residential and commercial elevators and escalators.
New Castle County
Some RestrictionsNew Castle County requires every elevator to pass inspection and testing before the Code Official issues a certificate…
Read full rule →Wilmington
Some RestrictionsWilmington requires building owners to have elevators periodically tested and to keep the code official informed of the…
Read full rule →Sussex County
Light RestrictionsSussex County's Housing Code doesn't set an elevator maintenance schedule; instead it treats a disrepaired elevator as…
Read full rule →Fire Sprinkler Requirements
When residential and commercial buildings must install fire sprinkler systems, including new-construction triggers and major-renovation thresholds.
Wilmington
Some RestrictionsApartments and other Group R buildings need automatic fire sprinklers citywide, but detached and semi-detached single…
Read full rule →Kent County
Few RestrictionsKent County's building code does not require automatic fire sprinklers in new homes. Its amendment to the International…
Read full rule →New Castle County
Few RestrictionsNew Castle County rewrote IRC Section R309 to swap 'shall' for 'may,' making automatic fire sprinklers optional in new…
Read full rule →Sussex County
Few RestrictionsSussex County does not require automatic fire sprinklers in new one- and two-family homes or townhouses; the county's…
Read full rule →Childcare Center Rules
Building safety standards specific to family childcare homes and centers, including egress, sprinklers, lead and asbestos clearances, and outdoor play standards.
Kent County
Some RestrictionsKent County's amended building code classifies day cares serving more than five children over 2.5 years old as Group E…
Read full rule →New Castle County
Some RestrictionsNew Castle County's Building Code raises the day-care occupant threshold to 12 children and adds sprinkler-alternative…
Read full rule →Wilmington
Some RestrictionsWilmington's building rehabilitation code requires day nurseries and residential child care facilities to enclose…
Read full rule →Door Locking Hardware
Code requirements for emergency-egress door hardware, including thumb-turn locks, panic bars, and one-action egress required by the building code.
Kent County
Some RestrictionsKent County's Housing Code requires every exterior door, hinge and latch in a rental dwelling to be kept in good…
Read full rule →New Castle County
Some RestrictionsNew Castle County's Tenants' Rights Guide requires every exterior door in a rental unit to have a working lock that…
Read full rule →Sussex County
Some RestrictionsSussex County's Housing Code requires every exterior door, hinge and latch to stay in good condition, and dwelling-unit…
Read full rule →Wilmington
Some RestrictionsWhen a Wilmington building undergoes work covered by the city's Renovation Subcode, any required exit door with a latch…
Read full rule →Green Building Code
CALGreen and equivalent state green building codes, plus reach codes that go further (electric-only new construction, EV-readiness, low-VOC materials).
Carbon Monoxide Detectors
Where CO detectors are required (typically near sleeping areas in homes with fuel-burning appliances or attached garages), and seller/landlord deadlines.
Kent County
Some RestrictionsKent County requires carbon monoxide alarms in dwelling units built under new construction. The requirement comes…
Read full rule →New Castle County
Some RestrictionsNew Castle County requires carbon monoxide detectors in dwellings licensed for in-home child care, under a Building…
Read full rule →Wilmington
Some RestrictionsWilmington requires an approved carbon monoxide alarm in every residential unit that relies on fossil-fuel heat, hot…
Read full rule →Building Permits
When a building permit is required, new work, renovations, reroofing, decks, the small-project exemptions, and what unpermitted work costs when it surfaces at sale or inspection.
Kent County
Some RestrictionsKent County requires a permit from the Department of Planning Services before constructing, enlarging, altering…
Read full rule →New Castle County
Some RestrictionsA building permit is required for most decks and patios, but small unattached decks and low hardscape patios are exempt…
Read full rule →Sussex County
Some RestrictionsSussex County requires a permit from the Building Official before constructing, enlarging, altering, repairing, moving…
Read full rule →Wilmington
Some RestrictionsNo one may occupy a new, altered, or converted building in Wilmington until the building inspector issues a certificate…
Read full rule →Electrical Permits
Which electrical work (panel upgrades, EV chargers, solar inverters, sub-panels) requires a licensed-electrician permit vs. an owner-builder permit.
Kent County
Some RestrictionsKent County requires a permit before erecting, installing, enlarging, altering, repairing, converting or replacing any…
Read full rule →New Castle County
Some RestrictionsNew Castle County has no standalone electrical permit or fee schedule line: electrical work is inspected during the…
Read full rule →Wilmington
Some RestrictionsWilmington requires an electrical permit for wiring work performed under the city's adopted 2018 International Building…
Read full rule →Plumbing Permits
Which plumbing work (water heaters, sewer-line replacement, repipe, gas-line) requires a permit, and which minor repairs are typically exempt.
Kent County
Some RestrictionsKent County adopts the International Plumbing Code for all plumbing work in the unincorporated county and requires a…
Read full rule →New Castle County
Some RestrictionsNew Castle County requires a permit before installing, altering, or replacing plumbing systems, but lets homeowners…
Read full rule →Sussex County
Some RestrictionsSussex County requires a County permit before anyone connects, disconnects or opens into the public sewer system, and…
Read full rule →Wilmington
Some RestrictionsWilmington requires a permit from the Department of Licenses and Inspections before starting plumbing work, with a…
Read full rule →Building Inspections
Required inspection types (rough framing, electrical, plumbing, final), how to schedule, what inspectors look for, and how to handle a failed inspection.
Kent County
Some RestrictionsKent County's building official must inspect permitted work at set stages, footing and foundation, concrete slab…
Read full rule →New Castle County
Some RestrictionsNew Castle County requires a sequence of building-permit inspections, footing, foundation, framing, weather barrier…
Read full rule →Sussex County
Some RestrictionsSussex County requires foundation, frame and final inspections on permitted construction, each triggered by a 48-hour…
Read full rule →Wilmington
Some RestrictionsWilmington's building official can enter buildings and premises to inspect for code compliance only between 8:00 a.m…
Read full rule →