Richmondtown’s Q3 2026 median rose 20.4% on PropertyShark while Redfin’s fell 7.9%, so an ADU decision should start with the lot and not a headline number.
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Joseph Ranola is a real estate broker and not an architect or expediter. An architect or expediter files the Department of Buildings application for an accessory dwelling unit, and this page covers the brokerage side: what a Richmondtown house is worth and how an ADU affects a sale.
PropertyShark reports a Richmond Town median sale price of $900,000 for Q3 2026, up 20.4% year over year, from 21 sales, with houses at a $942,000 median ($531 per square foot) on 20 sales. Redfin, measuring the three months ending August 2026, reports $937,000, down 7.9% year over year, with 14 sales in August and a median of 34 days on the market. The two sources point in opposite directions, and 21 sales is a small quarterly sample, so Joseph Ranola prices a Richmondtown house from its own comparable sales.
PropertyShark’s housing-stock table counts 2,373 single-family homes, 445 two-to-four family buildings and 97 condo units among 2,915 residential units. That is a large pool of one- and two-family lots, which are the lots the ADU rules are written for.
Generally yes, if the lot qualifies. The NYC Department of Buildings defines an accessory dwelling unit as an additional, self-sufficient dwelling unit not exceeding 800 square feet, allows one on a zoning lot with a one- or two-family building, and requires that the zoning lot be the primary residence of an owner when the unit is first occupied. ADU applications are filed through DOB NOW, and Local Laws 126 and 127 took effect on June 16, 2025.
Basement, cellar and backyard ADUs are prohibited in the 10-year rainfall flood risk area, the coastal flood risk area and special flood hazard areas, and other ADUs in flood areas face added elevation requirements. This page has not verified the zoning district or any landmark status of a particular Richmondtown lot, so an architect or expediter should confirm both before a plan is drawn.
For most Richmondtown buildings the PropertyShark data shows little flood exposure. PropertyShark’s risk table lists 1 flood-zone building and no hurricane-evacuation-zone buildings among 2,820 Richmond Town residential buildings, and the one flood-zone building is a condo building. Single-family and two-to-four family buildings show zero in both categories.
A building-count table is not a flood determination for your lot. Joseph Ranola recommends checking your exact address on the city’s flood maps and asking the architect to confirm which ADU types are allowed on it.
A permitted ADU helps only when its paperwork is complete, and an unpermitted unit becomes a problem in the buyer’s due diligence. DOB states that the certificate of occupancy must identify the unit as an ADU, and adding an ADU to a two-family home can change the building’s classification so that the Multiple Dwelling Law applies, which affects what a buyer and lender will accept.
Joseph Ranola advises owners to pull the filing history and certificate of occupancy before listing, and to market a legal ADU as documented rental income and not as a promise.
Joseph Ranola explains what a Richmondtown house sells for today, what a legal ADU could change, and who must be hired to file it, without overstating either. Joseph Ranola serves every neighborhood across Staten Island and Brooklyn, from Tottenville to Williamsburg.
“I buy & sell properties frequently. Joseph Ranola is great to work with. I have used his firm on a few projects. The team is eager to help & always available.” — Joe Obrien, verified Google review
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