A peninsula with stools at a 36 in counter is about 40½ in deep: 24 in cabinets, a 1½ in lip on the work side and 15 in of knee space. Give each stool 24 in of length. Keep a 42 in work aisle on the cooking side and 36 in behind the stools (NKBA). Because it needs no aisle on its attached end, a peninsula fits an L-shaped kitchen in a 12 × 12 ft room, where an island needs about 13 × 13 ft.
What a kitchen peninsula is
An island stands free with floor all around it. A peninsula is joined at one end, either to the end of a counter run or straight to a wall, so you walk around it on three sides only. That one closed end is what makes it fit smaller rooms: it needs no aisle there, and it can carry the plumbing or wiring from the wall instead of through the floor (work for a licensed plumber or electrician).
Most peninsulas turn an L into a U with one open-backed leg, or a U into a G. The cooking side faces the kitchen; the other side faces the dining or living room and takes the stools.
Peninsula size
| Part | Size | Source |
|---|---|---|
| Base cabinets | 24 in deep, 34½ in high | Wolf cabinet spec |
| Counter, no stools | 25½ in deep, like a wall counter: the cabinets plus a 1½ in lip | Caesarstone |
| Knee space at a 36 in counter | 15 in deep, so about 40½ in in all | NKBA |
| Knee space at a 42 in bar | 12 in deep, so about 37½ in in all | NKBA |
| Length per stool | 24 in: 48 in for two, 72 in for three | NKBA |
| Behind the stools | 32 in if nobody passes, 36 in to edge past, 44 in to walk past | NKBA |
| Work aisle on the cooking side | 42 in for one cook, 48 in for two | NKBA |
A cooktop on a peninsula needs counter behind it too: NKBA asks for 9 in behind the cooking surface when the counter is the same height, which a 40½ in seating peninsula has. The overhang itself is covered on countertop overhang.
Peninsula layouts, measured
- Narrowest aisle: 42 in
- Behind the stools: 36 in
- Work triangle: 15 ft 8 in
- Counter: 11 ft 8 in
12 × 12 ft, cooktop on the peninsula: passes
The peninsula is 78 × 40½ in, 42 in across the aisle from the counter, with 36 in behind the stools and a 40½ in walkway past its end. With the cooktop on it, the triangle is 15 ft 8 in, legs of 4 ft, 5 ft 2 in and 6 ft 6 in.
- Works: every NKBA minimum, in a room where an L with an island doesn’t fit.
- Watch: with the range kept on the wall instead, the same room comes up short of counter beside the sink and range, and one triangle leg is under 4 ft: the peninsula’s counter is landing space only for what stands next to it.
- Narrowest aisle: 42 in
- Behind the stools: 48 in
- Work triangle: 17 ft 5 in
- Counter: 13 ft 8 in
13 × 13 ft, sink on the peninsula: passes
Putting the sink on the peninsula lets whoever is washing up face the room. The stools have 48 in behind them, enough to walk past, and the triangle is 17 ft 5 in.
- Watch: a sink in a peninsula needs its drain and supply run through the floor or the attached end: work for a licensed plumber, and a permit in most places.
- Narrowest aisle: 43½ in
- Behind the stools: 48 in
- Work triangle: 17 ft 8 in
- Counter: 15 ft 3 in
The G: a U plus a peninsula
The peninsula sits 43½ in from the back counter and the stools have 48 in behind them. See the U-shaped kitchen for the rest of the U.
Peninsula or island?
Measure the room across the counters. An island needs a 42 in aisle on both sides of the cooking zone and a walkway at each end; a peninsula needs the aisle on one side only and nothing at its attached end.
- L-shaped kitchen, 12 × 12 ft: a peninsula with two stools fits (above); an island doesn’t. After the side counter (25½ in) and the aisle (42 in), 76½ in of floor is left, and an island needs at least 48 in of length plus a 36 in walkway past its far end: 84 in.
- From about 13 × 13 ft: either works. An island is easier to walk around; a peninsula keeps traffic out of the cooking zone. See kitchen layouts with an island.
Questions people ask
What is a kitchen peninsula?
A counter run joined to a wall or to other counters at one end and open on three sides, usually with stools on the outside. An island stands free on all four sides.
How deep should a kitchen peninsula with seating be?
About 40½ in at counter height: 24 in cabinets, a 1½ in lip and NKBA’s 15 in of knee space. At bar height (42 in) the knee space is 12 in, so about 37½ in.
How long should a peninsula be for three stools?
At least 72 in: NKBA gives each diner 24 in of counter.
Can a peninsula be attached to a wall?
Yes. In the G-shaped plan above it runs straight out from the wall. It still needs a 42 in aisle on its cooking side.
Sources
- NKBA’s free Kitchen Planning Guidelines with Access Standards: work aisles (42 in for one cook, 48 in for two), walkways (36 in), the work triangle (each leg 4 to 9 ft, 26 ft in all), landing areas beside the sink, cooktop and fridge, the dishwasher’s place and standing room, and seating clearances. This is the older free edition; the paid 5th edition (June 2026) may change some numbers.
- Wolf Classic Cabinetry product specifications: base cabinets 34½ in high and 24 in deep, stock widths 9 in and 12 to 42 in in 3 in steps (45 and 48 in by special order), wall cabinets 12 in deep
- Caesarstone: the standard depth of kitchen countertops, 25½ in (24 in cabinets plus a 1½ in overhang)
- Samsung “Will it fit” sheets for a counter-depth (28¾ in to the door front) and a standard-depth fridge (34¼ in to the door front); the planner adds 1 in behind, as KitchenAid’s guide asks
- Whirlpool WFES3530R 30 in range dimension guide: 29⅞ in wide, 25 7/16 in deep without the handle
Checked 19 October 2026. The plans are drawn and measured by our planner; room sizes are wall to wall.