On Teardown Ground
What the Lot Allows
B&Co. Design | Build · November 11, 2026 · 6 min read
A teardown is usually discussed as a house decision. The schedules say it is a land decision first: the lot's floor, its envelope and its ceiling are set by code before any plan is drawn.
When a house is bought to be replaced, the conversation usually starts with the house that will come next — its size, its style, its cost. The first document that governs the project says nothing about any of that. It is the municipality's schedule of area and bulk regulations: a table, printed in the zoning code, that sets the smallest lot the district recognises, how much of that lot may be covered, how far a building must sit from its lines, and how tall and how large it may be. Seventeen Bergen County towns publish seventeen versions of that table, and the firm's side-by-side read of their minimum lot sizes shows floors running from three acres to a city lot 25 feet wide. A teardown begins there, whether the parties read the table first or meet it later.
The floor: area and width, together
The schedule's first test is a pair, not a number. In Alpine's R-A and R-R districts the minimum lot is 87,120 square feet — two acres exactly — with 250 feet of width; in Saddle River's R-1 and R-3 districts the same 87,120 square feet comes with 200 feet of frontage and 200 feet of width, and a corner lot there needs 250 feet of both. A parcel can pass the area test and fail the width test: enough square feet in the wrong shape is not a conforming lot, and it will not carry the envelope the raw acreage seems to promise. The shape of the land is in the code before it is in any surveyor's drawing.
The floor also moves with facts that are not visible in a listing. Franklin Lakes sizes its largest district, A-130, by services: a lot with neither sanitary sewer nor public water must be 130,000 square feet, about three acres; with one of the two, 80,000; with both, 40,000 — and back up to 80,000 where the average grade is 16 percent or more. Closter draws a different line again: an existing lot may stand at 15,000 or 12,500 square feet, but a lot created by subdivision must be at least 43,560 square feet, a full acre. The same ground can be a conforming lot, a lot that cannot be divided, or a lot short of its district's floor, depending on its services, its slope and how it was created.
The envelope: yards, coverage and height
Past the floor, the schedule draws the envelope — the part of the lot a building may actually occupy. Saddle River's Schedule B, Chapter 210 of the Borough Code, works the arithmetic for its two-acre district: the front yard is 125 feet, measured from the center line of the street; the side yards are 40 feet each and the rear yard 50. Total improved coverage — house, drive, terraces, pool and every other improved surface together — is capped at 21 percent of the lot, which on 87,120 square feet is 18,295 square feet for everything. The principal building itself is held to 7 percent of the lot for a two-story house, about 6,098 square feet of footprint, under a height limit of 35 feet and two and a half stories. Two acres, read through the schedule, is a large lot with a precisely bounded building inside it.
The percentages are not flat, either. Englewood Cliffs' Schedule A sets lot coverage at 32 percent on a minimum lot and steps it down as the parcel grows; in Closter, Old Tappan and Haworth the floor-area ratios step down as lot area rises. The pattern is deliberate and it is consistent: the code gives a larger lot more house than a smaller one, but not proportionally more. Doubling the land does not double the building, and a price paid for acreage on the assumption that it does will meet the schedule eventually.
The schedule does not ask what anyone wants to build. It states what the lot can hold — and the land price, the plan and the budget all have to fit inside that answer.
The ceiling: floor-area ratio
Tenafly names its districts for their lots — R-40, R-20, R-10, R-9, R-7.5 — and then decides the house by a second, quieter number: the floor-area ratio. In R-40, on a minimum lot of 40,000 square feet, the ratio is 18.75 percent, so the total floor area of the house is capped at 7,500 square feet, and building coverage of 12.5 percent holds its footprint to 5,000. In R-10 the lot is 10,625 square feet and the ratio is 30 percent — about 3,188 square feet of floor area in total. The district's name tells a buyer how much land there is. The ratio tells the builder how much house the land will carry, and the two numbers together, not either one alone, are the lot's real specification.
Read the lot before pricing it
The working order follows from the tables. First, the district: which zone the parcel sits in is read from the municipality's zoning map, not from the neighbouring houses. Second, the floor: the lot's area and its width against that district's minimums, with its services, slope and history taken into account. Third, the envelope: yards, coverage, height and floor-area ratio turned into the largest house the lot will hold. Only then does pricing make sense — because land bought for a teardown is not priced for the house standing on it, or for the house imagined for it, but for the house the schedule allows.
One caution belongs in every such read. A minimum is a floor for a conforming lot; it does not by itself make an existing smaller lot unbuildable — each code carries its own provisions for lots that pre-date it, and whether a particular parcel conforms, and what its district permits, is a determination for the municipality's zoning officer and the owner's own professionals, not an assumption either side of a sale should make for the other. What the schedules offer is not a verdict but a starting point that never changes with the negotiation: seventeen public tables, printed in advance, waiting to be read in the right order.
