Kitchen Measuring Questions

Sketch the room, then measure each wall corner-to-corner, mark every window, door, outlet and plumbing/gas/HVAC point, check the corners for square, and compare against standard cabinet sizes.

Always in inches (write 42″, not 3′6″). It eliminates conversion errors and matches how cabinets are sized.

Measure each wall at three heights and use the smallest reading, then check the corner with the diagonal test. If the diagonals differ, the room is out of square — plan a scribe and filler on that side.

Yes — most homeowners do. A second person to hold the tape and double-check numbers improves accuracy, especially in corners, but it is not required.

Measure to the finished drywall surface, because that is what the cabinets sit against. Note stud locations separately for the install.

Leave about 1½″ at the end of a run against a wall, and more in out-of-square corners. Fillers are scribed to fit the real (often uneven) wall during install.

Base cabinets are 24″ deep and 34½″ high (about 36″ with counter); wall cabinets are 12″ deep and 30/36/42″ high; tall cabinets are 24″ deep and 84–96″ high. Widths run 9–48″ in 3″ steps.

Standard is the bottom of the wall cabinets 54″ off the finished floor, leaving a 15–18″ gap above a 36″ countertop.

Most fridge cabinets are 36″ wide to match a standard fridge opening (add fillers to reach about 37″ of clearance). Depth is a choice: a 12″ cabinet is cheapest and stores plenty, while a 24″-deep one sits flush with the fridge front for a built-in look but needs a side panel or wall to support it. Leave roughly 1″ of wiggle room around the fridge.

A sink base is usually 30″ or 36″ wide — the bowl has to fit between the side panels with room to spare. For an undermount sink, keep the sink’s outside width about 3″ under the cabinet’s inside width so there is room for the mounting clips and a support rail; a 36″ base comfortably takes a 30–33″ sink.

Letters are the type, numbers are the size in inches. B = base, W = wall, SB = sink base, DB = drawer base, BBC/WBC = blind corner, TP = tall pantry. Base and tall codes carry only the width, because height and depth are standard — B18 is an 18″ base. Wall codes carry width then height — W3030 is 30″ wide by 30″ high. Anything non-standard gets spelled out on the end.

It depends entirely which way, and the two directions are not equal. Measuring short — the wall is actually wider than you wrote — is survivable: a slightly wider filler absorbs it and nobody will ever see it. Measuring long is the expensive one: the run does not fit, and you are either pulling a cabinet out of the plan or re-ordering. That asymmetry is the entire reason for the round-down rule and for keeping a filler at each end of every run. Caught before ordering, re-measure. Caught after delivery, change the plan before you cut anything — swapping a 24″ cabinet for an 18″ plus filler is a two-minute redraw in the planner.

Measure now and again after demolition. The first set tells you what fits and lets you plan; the second is the truth, because the old cabinets were hiding bulges, patched drywall and out-of-plumb corners. Order from numbers taken off a bare wall wherever the schedule allows it.

Measure the ceiling height at every corner and at the middle of each run, and design to the lowest reading. A ceiling that drops an inch across a room will not stop 42″ uppers going in, but it will leave a wedge of daylight above them — which is exactly what crown moulding or a scribed filler strip is for. Decide which before you order the trim.

Three options: work under it with 30″ uppers, trim up to it so it reads as intentional, or take it out and run cabinets to the ceiling. Before you swing a hammer, know what is inside: soffits routinely hide ducts, plumbing stacks and wiring, and finding out mid-demolition changes the project.

Record four numbers: sill height from the floor, window width including the casing, how far the trim projects from the wall, and the distance from the window to each corner. A sill lower than about 36″ means no standard base run under it, and a faucet in front of a window needs room to swing up — measure the tap you intend to buy, not a generic one.

Measure its full width, height and how far it stands off the wall, and mark it on your plan like an appliance. Heaters need air: boxing one into a base cabinet is both ineffective and a real risk, so the usual answers are to leave that stretch open, relocate it with a licensed trade, or fit a toe-kick heater that lives inside the 4½″ kick space.

From the highest point of the floor, which is the same datum your cabinets will be set to. Measuring from a low spot flatters the room by an inch and is how a 96″ tall cabinet ends up not clearing the ceiling. Find the high point first, then measure up from there in several places.

Walk the room in one direction — clockwise from a corner — and record each wall as a run: overall length at three heights, then every feature in order with a start and end distance from the same corner. Add ceiling height, floor high point, and the position of every service. Our printable worksheet has all of it laid out so nothing is left to memory.

To the casing, because that is what a cabinet actually runs into. Note how far the casing stands proud of the wall too, since a base cabinet cannot sit tight against a projecting trim and a door needs somewhere to swing. Where it is tight, a filler at that end is the usual answer — it looks deliberate and saves the whole run.