Cumberland planners present housing study and estimate up to a dozen ADUs a year
Loading...
Summary
Planning staff presented a housing needs assessment and accessory dwelling unit (ADU) analysis, concluding the town could see roughly 9–12 ADUs built per year and that ADUs alone will not solve a larger housing shortage. Councilors raised concerns about infrastructure, walkability and affordability.
The Cumberland planning department on April 16 presented a housing needs assessment and analysis of accessory dwelling unit (ADU) policy, concluding that ADUs would likely be a limited, distributed housing response and would not by themselves solve the region’s housing shortfall.
Planning staff said the town’s housing stock is aging and housing construction has dropped sharply since 2008, and that local incomes and home values have risen faster than statewide figures. Roman Lombardo of the planning department said estimates based on comparable state-level legislation and local population share suggest Cumberland could add roughly 9 to 12 ADUs per year, or about 45 to 60 units over five years.
The study matter-of-factly framed ADUs as a “tool in the toolbox,” not a comprehensive remedy. Lombardo said ADU construction is constrained because most town parcels cannot support detached ADUs; his parcel analysis found roughly 69.6% of Cumberland parcels would not be suitable for a detached ADU. He also reported that Cumberland had received six ADU permit requests since the Rhode Island law took effect in July.
Councilors asked for more detail on the estimates and on where ADUs were already occurring statewide. Lombardo said much ADU activity in Rhode Island has clustered around the University of Rhode Island in South Kingstown and near Narragansett. He explained his 9–12 per year estimate by proportional scaling from Massachusetts’s recent ADU estimate and the relative population share of Cumberland in Rhode Island.
Several councilors and members of the public pressed planning staff on practical constraints. Councilor Boyle said Cumberland lacks walkability, transit and piped water capacity in parts of town, and warned that adding ADUs without infrastructure improvements could shift costs to ratepayers. Boyle said Lippitt Estates, for example, has aging 2‑inch water mains and that extending more units there could raise residents’ water bills to pay for upgrades. Councilor Boyle also noted state ADU legislation does not require units to be affordable.
Planning staff acknowledged such constraints and said the ADU policy would likely produce “gentle” density spread across the town rather than concentrated redevelopment. Staff flagged the town’s median structure year (1969), an above‑state median household income, rising rents and a decline in annual housing production as background variables that shaped their findings.
The presentation included comparisons to Portland, Ore.; California; and Boston. Staff noted that in Portland ADUs account for about 2.2% of households despite permissive rules, and that in California many ADUs are garage conversions rather than new detached buildings. Boston’s pilot programs were cited for pairing technical assistance and small interest‑free loans to help homeowners create ADUs.
Councilors requested follow‑up: clearer estimates of likely rents for ADUs, closer attention to parcel‑level constraints, and modeling of where infrastructure investments would be required. Roman Lombardo and planning staff said they would provide more granular data and follow up with council members.
The presentation closed with the planning department offering to return the draft ordinance for further council review and possible amendments to reflect local concerns about infrastructure and affordability.
Lombardo summarized the department’s assessment: ADUs can add modest, town‑wide housing capacity without dramatically changing character, but they are not a panacea for the broader housing shortage and their local impacts depend on infrastructure and market conditions.
