New Castle County, DE Building Safety: Door Locking Hardware (2026)
Key Facts
- Rule
- Exterior doors need a working lock
- Key rule
- No key needed to exit inside
- Where codified
- Ch. 19 Appendix, Tenants' Rights Guide
- Enforcer
- Dept. of Land Use, 302-395-5555
- Scope
- Unincorporated County + contracted municipalities only
Summary
New Castle County's Tenants' Rights Guide requires every exterior door in a rental unit to have a working lock that opens from inside without a key, enforced by the Department of Land Use.
Locked Doors: All exterior doors must operate and have a working lock. All doors used to exit your rental unit must open easily from the inside WITHOUT the need for a key.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 5).
Full Breakdown
Chapter 19's mandatory New Castle County Tenants' Rights Guide, codified as the Chapter's Appendix under Sec. 19.03.003, sets the county's minimum standard: exterior doors on a rental unit must operate and have a working lock, and any door used to exit the unit must open easily from the inside without a key, no double-keyed deadbolts trapping tenants. Landlords must distribute the Guide to every tenant. The rule reaches landlords in unincorporated New Castle County and in incorporated areas that have contracted with the County to participate in rental registration; Wilmington and Newark, which run their own housing codes, are not covered.
Violations & Fines
Tenants report non-working or key-locked exit doors to the Department of Land Use (302-395-5555); unresolved violations escalate under the Code's general penalty: fines starting at $100, rising with repeat convictions.
Frequently Asked Questions
Does this rule apply to rentals in Wilmington or Newark?
Can a landlord require a key to unlock the door from inside?
Where is this rule written in the county code?
Sources & Official References
Other rules in New Castle County
Compare New Castle County to another location·View the Delaware building safety overview
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