Measure the Corner Before You Buy Anything
Nook furniture fails on clearances. These are the numbers that decide it.
The numbers that come up most
- Bench seat height 17 to 19 in, paired with a table at 28 to 30 in (JJones)
- Walkway behind a seated diner: 36 in minimum, 42 in for comfort (JJones)
- Desk work surface 28 to 30 in high, depths 20 to 36 in (Dimensions.com)
- A corner buys you space because two sides sit against walls, so the walk-past clearance disappears on both
Why measuring is the whole problem
Almost nothing sold as nook furniture fails because it looks wrong. It fails because the bench is two inches too tall for the table, or the walkway drops below thirty inches and the kitchen stops working, or the seat is so deep that shorter people cannot reach their plate without perching on the front edge.
None of that is visible in a product photo, and most listings publish the outside dimensions rather than the ones that matter. A bench listing will tell you it is 60 inches wide. It will rarely tell you the seat height, and seat height is the number that decides whether you can eat at it.
So these guides work the other way round. They start from the clearances a room has to give you, and they end at the furniture that fits inside them.
The guides
Seat height, depth, back height, cushion thickness, the gap to the table, knee clearance and how much bench each person needs. The most-referenced set of numbers in the niche.
How much space a nook actually needs, built from clearances rather than the unsourced five-foot square that gets repeated everywhere.
The 30-40-50 diagonal check, why most corners are not square, and how to measure around skirting boards before anything gets cut or ordered.
Perch depth against lounge depth, seat height, cushion range, and the bedroom egress requirement almost every window seat guide leaves out.
Why foam density beats thickness, the compression arithmetic for seat height, and how to measure a corner bench so two cushions meet without a gap.
Measuring a bay, why the angles come before the lengths, and when made to measure is the only honest answer.
Why the corner of an L-shaped desk is unreachable, what that dead space is good for, and why run length makes no difference to any of it.
Air care guides
Two guides live on this path and cover a different subject: the air in the room rather than the furniture in it. They follow the same sourcing rules.
What each one actually does to the air, what neither can do, and which machine fits which problem.
Part numbers by model straight from the manuals, replacement intervals, and the parts you currently cannot buy in the US at all.
How the numbers here are sourced
Every measurement here links to where I found it, and each page carries a sources block at the foot. Where a figure is calculated rather than published, the page says so and shows the method.
The references that come up most often are the NKBA kitchen planning guidelines, Dimensions.com, Fine Homebuilding, and trade sources for banquette and contract seating. Manufacturer documentation gets used for specific models and is labelled as such, because a manufacturer describing its own product is a different kind of source from an independent one.
The full standard is on the methodology page, including what gets rejected and what this site cannot tell you.
Before you measure anything
Check whether the corner is actually square. Mark 30 inches along one wall and 40 along the other, then measure between the marks. It should come to 50. In most houses it does not, and a built-in cut to a square assumption will show a gap along one wall.
Measure at floor level rather than at waist height. Skirting boards eat one to two inches, and a corner piece touches two walls instead of one, so the error doubles.
Questions
Where do I start if I am building a breakfast nook?
Seat height and table height first, because they have to pair. Everything else follows from those two.
Do I need different numbers for a built-in than for a freestanding set?
The clearances are identical. A freestanding set has already made the height decisions for you, which is its main advantage and the reason it suits rented rooms and out-of-square walls.
Are these US or metric figures?
Inches, because the sources publish in inches. Where a source gives both, both are quoted on the page.
How these numbers get checked: methodology.