Standard Kitchen Unit Measurements & Hardware Fit

August 25, 2026

Whether you are building a new kitchen from scratch or replacing worn components in an existing layout, understanding standard kitchen unit measurements is essential. Cabinet carcasses across the UK generally adhere to modular industry standards, which makes sourcing and replacing hardware straightforward once you know the core dimensions to look out for.

UK Base and Wall Unit Dimensions

In standard UK kitchen joinery, base units typically stand at a carcass height of 720 mm, supported by adjustable cabinet legs ranging from 100 mm to 150 mm. This creates an overall worktop height of roughly 870 mm to 910 mm. Base cabinet depths usually measure 560 mm to 570 mm to allow for a rear service void behind the back panel, covered by a 600 mm deep worktop.

Wall units tend to be shallower, with standard depths ranging between 300 mm and 350 mm, allowing sufficient clearance over the work surface. Carcass widths across both base and wall cabinets follow standard modular increments: 300 mm, 400 mm, 450 mm, 500 mm, 600 mm, 800 mm, 900 mm, and 1000 mm.

Choosing the Right Drawer Runners

Selecting the correct drawer runners depends entirely on the internal depth of your base unit carcass. While the exterior depth is usually around 560 mm, the internal usable space is often closer to 500 mm to 520 mm once the back panel and service void are accounted for.

Runner Lengths: Standard bottom-mount and ball-bearing side-mount runners are commonly fitted in 450 mm or 500 mm lengths for standard base units.
Internal Width Calculation: Always subtract the carcass wall thickness (typically 18 mm on both sides, totalling 36 mm) before sizing your drawer box and choosing between side-mounted or concealed undermount runners.
Load Ratings: Standard cutlery drawers perform well with 25 kg to 30 kg rated runners, whereas deep pan drawers benefit from heavy-duty 45 kg to 50 kg full-extension runners.

Hinges and Cabinet Door Compatibility

Standard kitchen doors are manufactured 4 mm narrower and shorter than the nominal carcass dimensions (for example, a 716 mm x 596 mm door for a 720 mm x 600 mm carcass) to maintain a consistent 2 mm reveal around the perimeter.

The standard fitting for these doors is the 35 mm concealed hinge, often referred to as a cup hinge. Key points to remember include:

Cup Drilling: The standard cup hole diameter is 35 mm, drilled to a depth of approximately 11.5 mm to 12.5 mm, located 4 mm to 6 mm from the door edge.
Cranking: Full overlay hinges are the standard choice for single-door units and outer ends, while half-overlay hinges are used where two adjoining doors share a central 18 mm partition wall.
Fixing Grid: Mounting plates follow the standard 32 mm system, lining up with the pre-drilled vertical hole rows found in flat-pack carcasses.

Fitting Internal Wirework and Pull-Out Storage

Pull-out larders, corner carousels, and base unit wire baskets are manufactured to fit specific external cabinet widths. However, because carcass board thickness varies between 15 mm and 18 mm in the UK, measuring internal clearance is vital.

Blind Corner Units: Internal pull-out mechanisms generally require a minimum door aperture width (typically 400 mm or 450 mm) and an uninterrupted depth of at least 500 mm.
Larder Units: Tall larder carcasses are normally 1970 mm or 2150 mm high; matching multi-tier pull-out frames require precise vertical alignment between top and bottom heavy-duty runners.