The tenement flat, the narrow stair, and the closet that was never built.

Nolita and Little Italy are the same street grid read twice. Mulberry, Mott and Elizabeth run the length of both, and the buildings along them were put up in the same decades for the same purpose: five- and six-story walk-up flats, four windows to the street, a rear yard behind. Little Italy holds the older, denser version of it around Mulberry; Nolita, the blocks north toward Houston, holds the version that was renovated first and now carries co-op and condo lines above the shops. What the two share is the closet question, which is really a question of absence. These apartments were not built with closets that anyone would recognise as such. They were built for a wardrobe, a hook rail and a trunk.

The tenement plan explains most of the brief. Old-law buildings from before 1901 run their rooms in a line with no hall — the railroad flat — and light the middle room off an air shaft; the new-law buildings that followed the 1901 code gave slightly better windows and a slightly wider stair, and neither generation gave storage. Add a century of settlement and the walls stop cooperating: party walls that bow over their length, floors that fall an inch toward the street, wood lath under three coats of plaster, and a pressed-tin ceiling that no one wants to touch. Door heads were set by eye and no two openings on a floor match. We stand our casework as furniture on the floor rather than fastening a load into plaster, and we scribe to base and cornice instead of cutting them. It is also the plain argument for made-to-measure here rather than a configured system: a wall that loses three-quarters of an inch over eight feet turns a run of stock panels into a row of tapering gaps, which is why we draw and mill every piece to the room instead of ordering it to a catalogue dimension. The prewar joinery problem is at its most literal in buildings this old and this small.

Then there is the stair, which decides more than clients expect. A six-story walk-up with winders at every landing and a four-foot turn at the top will not accept a fully assembled seven-foot wardrobe, and no one is craning through a Mulberry Street window. So the stair is surveyed with the apartment and the panel sizes are drawn to it — the piece is broken where the turn requires it and joined on site so the seam falls in a shadow line rather than across a door face. Everything is designed in 3D and milled in our own Bronx workshop at 382 Canal Place in Mott Haven, then dry-fit on the bench before it ships, which is what keeps an install in a fifth-floor flat down to days. The crew that measures the apartment is the crew that carries it up and sets it; we have never subcontracted a job, and we have worked this way since 2008. The cabinetry carries a twenty-five-year guarantee. Streets matter too — these are narrow, hydrant-tight blocks, and the week of the San Gennaro feast in September closes Mulberry entirely, so delivery windows get booked around the calendar rather than against it.

What we build in the walk-ups is unglamorous and transformative in about equal measure. Where there is no closet at all, a bedroom wall becomes one: a bank of reach-ins built floor to ceiling, double-hung rails to seven feet, drawers at the bottom for what a household actually folds, and a cabinet band above the doors for luggage and off-season wool. In the railroad plan the joinery does the work a hallway would have done — a shallow depth along the through-wall, so the room still reads as a room. At the entry, where the door opens straight into the kitchen, a coat-and-shoe unit eighteen inches deep changes how the apartment behaves on a wet Tuesday. And in a 550-square-foot flat where someone works from home, a study wall with a desk that stays loaded when it closes is usually a better answer than a desk. This is the whole discipline of small-apartment optimization: find the twenty inches above the door, the eight inches beside the chimney breast, the depth nobody counted.

The other half of the neighborhood is newer than it looks. Nolita has absorbed a generation of small condo buildings — eight and twelve units, one apartment to a floor — along with conversions of commercial and civic stock, the old Police Headquarters on Centre Street among the best known of them. Those apartments give what the tenements withhold: square rooms, drywall on studs, ceilings at ten feet and sometimes higher. The constraint inverts. The rooms are honest and the builder fit-out is thin, usually a single wire shelf and rod at five feet with three feet of dead air above it, so the work is to take the joinery up to the slab and use the height. Where two lines have been combined, or where a loft conversion gives up an interior room with no window, that room becomes a dressing room with an island — a windowless room is a liability as a bedroom and an asset as a wardrobe.

Budgets here follow the apartment, not the address, and the range is wide because the housing stock is. A rebuilt bedroom reach-in in a walk-up starts around $3,500; a full wall of wardrobe with a cabinet band above runs several times that; a dressing room in a combined line or a converted loft reaches into the tens of thousands, and we publish how the pricing works rather than make you ask. The borough page for Manhattan collects the neighboring ground, and the guide to NoHo, Nolita and the Lower East Side covers the wider district this one sits inside. The first conversation is sixty minutes, at the apartment or at the workshop: $350 flat, credited to your project. Bring the floor plan if you have one — and tell us which floor.