ADU rules in Manasquan

Manasquan allows a detached second home on a house lot in only two narrow ways. In the R-4 Beachfront zone, § 35-11.2b permits "Two principal buildings" on a lot when "A garage with a second floor living unit shall front on First Avenue and a single-family residential dwelling shall front on the beachfront," on lots at least 30 feet wide and 4,200 square feet; the Borough's own 2025 Housing Element says this provision "does allow for accessory apartments," and the Planning Board approved bulk variances to rebuild such a pair at 65 Beachfront and 62 First Avenue on 9-1-2026 (Application 08-2026). Everywhere else the only route is the deed-restricted affordable accessory apartment program, which allows a unit "within an existing accessory building that contains an existing dwelling unit" (§ 35-36f.2(b)), so a brand-new backyard cottage is not authorized even though the program's borrowed Fair Housing Act definition mentions separate detached structures. Other lots may hold only one principal building (§ 35-11.2a), the residential accessory-use lists stop at garages, sheds, pools and similar structures, and "All uses not expressly permitted in this chapter shall be deemed to be prohibited uses" (§ 35-7.6b).

An apartment inside or attached to a house exists only as an income-restricted unit under the affordable accessory apartment program: § 35-36f.2(a) states its purpose "to allow accessory apartments within all zones located in the Borough to provide for the development of affordable housing," and (b) permits them "within the new or existing principle dwelling building." The house keeps one principal entry facing the street and the apartment gets "a separate distinct entry which does not detract from the character of the principal building" (f.2(e)), and the unit must be rented to an income-eligible household under a recorded deed restriction (see rentalRestrictions). There is no market-rate route: R-1 through R-5 permit only single-family detached dwellings, and the 2022 definition of mother/daughter housing describes living space that "can only be accessed through the existing dwelling and not by a separate entrance," adding "A fully independent dwelling unit is not permitted" (no district lists it as a use). Duplexes are a principal permitted use only in the R-2A zone, which Ord. Nos. 2399-23 and 2400-23 (6-12-2023) mapped onto four lots (Block 35, Lots 19, 20, 21 and 22.01); that is a two-family house, not an accessory unit.

The affordable program sets a floor, not a ceiling: "The minimum floor area for any accessory apartment shall be 350 square feet" (§ 35-36f.2(c)), floor area ratio limits do not apply to conversions of existing buildings but do apply to expansions and new construction (f.2(d)), the program "shall not restrict the number of bedrooms" (f.2(h)(4)), and the unit is "subject to the bulk and yard requirements of the zone" (f.2(a)), for example 25 percent building and 35 percent lot coverage in R-1 and 30 and 45 percent in R-2, with houses limited to 35 feet and 2.5 stories. For the R-4 garage apartment, § 35-11.2b sets an envelope rather than a unit size: the First Avenue building stands at least 10 feet back from that street and 35 feet from the beachfront house, may be no taller than 32 feet, and its first floor must "provide an interior parking area for at least two motor vehicles" with "no living area," so the unit occupies the second floor and any half story. Schedule I's R-4 limits (35 percent building coverage, 50 percent lot coverage, a second floor no larger than 85 percent of the first-floor footprint and a half story no larger than 60 percent of the second floor) apply to the lot's two buildings together. Ordinary detached garages elsewhere are capped at 600 square feet of building coverage and 15 feet (§ 35-5.2b.3).

Neither path requires the owner to live on the property. § 35-36f.2 controls who may rent the accessory apartment (income-eligible households for at least 10 years) but says nothing about who occupies the principal dwelling, and the 2019 version it replaced (former § 35-38B, Ord. No. 2284-19) had no owner rule either; § 35-11.2b sets only dimensional conditions for the R-4 garage apartment. Chapter 35's owner-occupancy language reaches other uses: a bed and breakfast is "An 'owner-occupied' dwelling" (§ 35-3.1), and a household that buys a deed-restricted affordable ownership unit "must occupy it as the certified household's principal residence and shall not lease the unit" (§ 35-36n.3), a rule for for-sale affordable units rather than accessory apartments. New Jersey has no statewide ADU owner-occupancy rule.

§ 35-36f.2(f) says "Parking shall be provided in accordance with the Residential Site Improvement Standards (N.J.A.C. 5:21-4.14)," whose Table 4.4 sets the most a local reviewer may require: 1.5 spaces for a two-bedroom single-family dwelling, 2.0 for three, 2.5 for four (also the default when bedrooms are not stated) and 3.0 for five, with each unit of a two-family dwelling at the single-family values, and reviewers may allow fewer. In R-4, § 35-11.2b.9 requires the First Avenue building's first floor to "provide an interior parking area for at least two motor vehicles." The borough's own Schedule II still reads "2 for every dwelling unit" for single and two-family dwellings (§ 35-13.4), and the Planning Board treated "two spaces per dwelling" as required when it heard the 65 Beachfront and 62 First Avenue rebuild on 9-1-2026, accepting one garage space plus the apron; because N.J.A.C. 5:21-1.5(b) makes RSIS "the maximum that may be required in connection with residential development," a bedroom-based figure controls where Schedule II asks for more. Spaces must be on the same lot (§ 35-13.2a) and each lot gets one curb cut (§ 35-7.7d).

Both routes are administrative. An affordable accessory apartment is permitted outright in every zone by § 35-36f.2(b); applicants "shall submit plans of building(s) showing layout of accessory apartment and principal building, entry location, and elevations," plus a site development plan "to demonstrate compliance with zoning and parking regulations" (f.2(j)), and the Borough's administrative agent (CGP&H, retained for 2026 at the 1-5-2026 reorganization) runs the subsidy agreement and deed restriction under the Accessory Apartment Program Manual adopted by Res. 147-2026 on 6-1-2026; no Planning Board hearing is described. A conforming R-4 garage apartment needs only a zoning permit from the Zoning Officer ($325 for a new residential home) and a construction permit (§ 14-1.4a), because one- and two-family structures "permitted as a right" are exempt from site plan review (§ 35-18.4a); the Planning Board is involved only for variances, as on the substandard 25-foot lot at 65 Beachfront and 62 First Avenue (bulk relief granted 5-3 on 9-1-2026). Any other second unit is a use the zone does not permit and needs a d(1) use variance from the Planning Board, which exercises the dissolved Zoning Board's powers (§ 31-15) with the Class I and III members excluded from d-variance votes (§ 31-8c); N.J.S.A. 40:55D-70(d) requires "affirmative vote of at least five members," and the application fee is $700 plus a $1,700 initial escrow deposit (§ 16-1.1, entry 31-19).

§ 35-36f.2(h)(1) requires that "at the time of initial occupancy of the unit and for at least 10 years thereafter, the accessory apartment shall be rented only to income eligible households," with rents set by the affordable-rental methodology and a recorded deed or declaration "limiting its subsequent rental for the duration of the control period" (h)(2) and (3); the Borough pays $25,000 (moderate), $35,000 (low) or $50,000 (very low income) toward creation or reduced rents (f.2(i)(3)). Tenants must qualify at 80, 50 or 30 percent of regional median income and rent generally may not exceed 35 percent of household income (§ 35-36r), and leases must be written with add-on fees limited (§ 35-36q); the section's general rule that "each restricted rental unit shall remain subject to the requirements of this section for a period of at least 40 years" (§ 35-36p.2) sits uneasily beside the program's 10-year term. For every rental, Chapter 15 requires the owner to apply to the Code Enforcement Official within 10 days of signing a lease, with a copy or abstract of it, and to pass an inspection; summer permits run May 1 to September 30, a lease between October 1 and May 1 needs its own permit, and other permits last until the tenant changes or three years (§§ 15-1.1, 15-1.2, 15-1.4), at $175 per summer or winter rental and $200 for an annual one (§ 16-1.1), with a posted Rental Certificate of Occupancy stating maximum occupancy (§ 15-1.7) and a lead-safe certification for pre-1978 units (§§ 13-8.2, 13-9.4). A landlord of a seasonal rental (any term under a year that includes part of May 15 to September 15) can be ordered to post a $500 to $5,000 bond after three substantiated disorderly-conduct convictions in a year (§§ 15-2.2, 15-2.3). The code has no short-term rental ordinance, registry or minimum stay: quoted searches for "short-term rental(s)," "short term rental(s)" and "Airbnb" return nothing.