Rental conversions in Dover

Kent County's accessory dwelling unit chapter, adopted in 2023, permits ADUs in all residential zones, subject to other regulations and building codes, and limits each property to one ADU, attached or detached.¹² In Kent County, one dwelling unit on a property with an ADU must be owner-occupied, and a notice and declaration of land use restriction saying so must be signed and recorded before the county issues a certificate of use or building permit for the ADU.¹²

A Kent County ADU may not exceed half of the main dwelling's floor area, though square footage needed to meet accessibility standards doesn't count toward that limit, and total impervious cover on the lot is capped at 50 percent.¹² A detached ADU in Kent County must sit behind the main house, keep at least half of the house's side and rear setbacks, and be built on a slab or crawl space; basements are not permitted.¹²

Kent County does not allow manufactured homes to be used as ADUs, and a dwelling served by an on-site wastewater system cannot be modified to create an ADU until DNREC issues a permit for it.¹² On a septic lot, line up that DNREC approval first; a second kitchen and bath mean more water through the same tank and drain field.

Kent County's building permit law doesn't apply inside incorporated cities and towns that adopt and enforce their own building code and permit procedures.¹³ The City of Harrington, a Kent County town with its own ADU chapter adopted in 2025, requires the owner to live in either the main house or the ADU, lists rental units as prohibited, and bars selling an ADU separately.¹⁶

So if your address is inside one of the county's incorporated towns, start at that town hall rather than the county office, and ask whether a unit may be rented at all.

Dover's rental code counts apartments, rooming houses, condominium units and accessory apartments inside owner-occupied houses as multiple-family dwellings, and detached houses, mobile and manufactured homes, duplexes and townhouses as single-family dwellings.¹⁴ The zoning pages we could read didn't settle where the city allows a second unit in a house, so ask the planning office whether your zone permits one before paying for drawings.

No one may operate a single-family rental dwelling in the City of Dover without a permit from the licensing division of the Department of Planning and Inspections; the permit expires each January 31, and multiple-family dwellings need an annual permit too.¹⁴ The City of Dover's code enforcement office inspects rental dwellings for compliance with the property maintenance code, an inspection is required before any new rental dwelling permit is issued, and the owner or property manager must be present.¹⁴

A Dover rental owner who lives outside Kent County must have a licensed property manager, or a family member or other designated person, living or keeping an office in the county who can give inspectors access.¹⁴ Book the city's rental inspection only after the building, plumbing and electrical inspections are closed, because the code officer will look at the same alarms, exits and outlets.

In the City of Dover, a short-term rental (a stay of less than 30 days) is allowed in a one-family dwelling where that use is allowed by right, but the owner needs an annual short-term rental use license, renewed by January 31, and a code enforcement inspection before the first license.¹⁴ Dover limits a short-term rental to two guests aged 12 or older per bedroom and twelve occupants in all, one extra vehicle per bedroom up to six, and requires guests to have access to a full bath.¹⁴

Delaware charges a 4.5 percent short-term lodging tax on the rent for a house, apartment or other dwelling rented to guests for no more than 31 consecutive nights, and anyone in the business of offering such rentals to the public needs a Delaware business license.¹⁷ Delaware exempts an owner's casual rental arranged directly with the guest when the property is rented for no more than 10 nights in total in a calendar year.¹⁷

Kent County's Airport Environs Zoning Overlay around Dover Air Force Base requires buildings constructed or placed in its noise zones to have acoustical treatment cutting outdoor-to-indoor noise by 25 to 40 decibels depending on the zone, certified by a Delaware-accredited architect or engineer.¹⁸ A detached cottage is a new building, so if your lot is inside the overlay, ask the county whether the sound standard applies before the plans are drawn. Kent County must tell permit applicants when a property is in the Airport Environs overlay and subject to overflights, noise and sound-attenuation rules, and the same notice language must appear in deeds and leases for affected land.¹⁸ That notice belongs in the lease you give a tenant as well.

Dover's amendments delete the residential code section that calls for automatic fire sprinkler systems in houses.¹⁴ That doesn't remove the need for a fire-rated separation between two units, a way out of each one and working alarms, so ask the company which code edition the permit office enforces. The U.S. Fire Administration says homeowners and landlords should put smoke alarms in every bedroom, outside each sleeping area and on every level, test them monthly, and replace them 10 years from their manufacture date.¹⁹

Before a renter signs a lease for most pre-1978 housing, federal law requires the landlord to disclose known lead-based paint and hazards, share available records, hand over EPA's Protect Your Family From Lead pamphlet and include a Lead Warning Statement.²⁰ With 35%⁹ of county homes built before 1980, plan on lead-safe work in most older houses until a test shows otherwise.

Plenty of conversions around Dover end up housing a mother or father rather than a tenant; 33%³²¹ of the county's owner households are already headed by someone sixty-five or older. Kent County leaves the space needed for accessibility standards out of its size limit, so a wider door, turning room and a curbless shower don't eat into the allowed floor area. NAHB's Certified Aging-in-Place Specialist (CAPS) credential trains remodelers in home modifications for aging in place.²²

Call the number on this page and you reach one independent company that handles rental conversions in the Dover area. The call is recorded, and the work, the timing and the price are settled between you and that company.

The company pays us for the call. It costs you nothing, and we never call or text you afterward. How we make money

Before you sign a contract, look the company up on the state's own sites. Delaware's public Contractor Registry lookup lists contractors that properly registered and are considered compliant with Department of Labor laws, searchable by name, ZIP code, certification number, NAICS code or industry; a contractor that drops off the list may not have re-registered, may be under review, or may have been suspended or revoked.²³ Check a Delaware license