How Do You Fit Kitchen Plinths, Cornice and Pelmet Cleanly?

Quick Answer: The plinth (also called kickboard or kicker) is the panel between the cabinet base and the floor, typically 150mm high (sometimes 100 or 200mm). It is clipped to the cabinet legs, not glued or screwed to the cabinet front. Cornice runs across the top of wall cabinets for a finished perimeter; pelmet runs under wall cabinets to hide under-cabinet lights. All three rely on square mitres (45° internal corner, 90° external in line) cut with a mitre saw, glued and pinned, then scribed to the floor or ceiling where surfaces are out of true.

Summary

Plinth, cornice and pelmet are the trim that turns a row of cabinets into a finished kitchen. They are also where second-tier kitchen fitters give themselves away — gaps at floor level, mitre joints that have opened, cornice that drops 5mm at the corner — these tell-tale defects are visible from across the room.

Good fit on these elements depends on disciplined work in order: get the cabinets perfectly level and square first; cut and dry-fit the trim before any glue; scribe to floor/ceiling where required; then fix permanently. Skipping the dry-fit and the scribe is the biggest single cause of poor finish.

Materials vary: vinyl-wrapped MDF (most common for budget kitchens), painted timber (mid range), solid timber (premium), and metal (industrial / professional designs). Painted MDF takes scribing well; vinyl-wrapped MDF chips at the cut edge if not handled correctly.

Key Facts

Quick Reference Table

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Trim Element Standard Height/Profile Function Fixing Method
Plinth (kickboard) 150mm × 18mm Hides cabinet legs, allows toe-space Clip to legs (push-fit)
Cornice 70–90mm × 30–40mm Finishes top of wall cabinets Screw from cabinet top
Pelmet 40–60mm × 30–40mm Hides under-cabinet lights Screw from inside cabinet
Light pelmet 50mm with LED rebate Hides + lights Same as pelmet
Tall unit cornice Matches cabinet width Finish top of tall unit Screwed from top
End panel scribe 18mm × cabinet height Hides cabinet side at end of run Glued + pinned to cabinet side
Service void plinth 200mm with 60mm slot Allows airflow to integrated cooler Clip + slot template

Detailed Guidance

Plinth fitting sequence

Plinth Fit — Step-by-Step
1. Measure each run between fixed obstacles (walls, end panels)
2. Cut plinth to length, leaving 2mm wiggle on internal corners
3. Dry-fit all plinth sections — check overall fit before any cuts
4. Scribe to floor on uneven sections
5. Cut joints (45° mitre on external corners, butt joint on internal)
6. Clip plinth to cabinet legs
7. Fit floor seal strip
8. Final wipe-down

Scribing the plinth to the floor

If the floor is uneven (most UK kitchens have a 5–15mm variation across a run), the plinth needs scribing or the gap shows. Two methods:

Scribed plinths sit on the floor with minimal gap. A 2mm gap is acceptable (covered by the floor seal strip); 5mm+ looks unfinished.

Cutting internal and external corners

Internal corners (where two plinths meet at an internal angle, e.g. an L-shape kitchen):

External corners (e.g. a peninsula where the plinth wraps around):

Floor seal strip

A flexible PVC strip glued or push-fit to the bottom of the plinth, brushes the floor and seals the small gap below. Available in clear, white, brown, and matched-to-plinth colours. Critical in:

Plinth detail around appliances

Where a built-in dishwasher, washing machine or fridge sits at the cabinet line, the plinth is fitted in sections:

Around a built-under oven, where heat is exhausted at the plinth level:

Cornice fitting

The cornice is the perimeter trim across the top of wall cabinets. Three common profile types:

Fitting:

  1. Measure the full run including any return at the end of the cabinet line
  2. Cut cornice to length plus 50mm on the longer runs (final trim happens at fit)
  3. Cut external corner mitres at 45° (verify mitre saw is dead 45°; offcut test first)
  4. Cut internal corners — typically a coped joint where one piece is square-cut and the other coped around the profile (the same as picture rail in joinery)
  5. Dry-fit all sections before any glue
  6. Glue mitre joints with PVA + 23-gauge pin nail; clamp until set
  7. Fix cornice down to the cabinet top with 50mm screws through the cornice into the cabinet carcass — heads countersunk and capped, or hidden by cornice profile

Many modern kitchens use a "shadow gap" detail instead of cornice — a 20mm void at the top of the cabinet line giving a clean modern line without the traditional cornice profile.

Pelmet fitting

The pelmet runs under wall cabinets, hiding under-cabinet lighting and giving a finished bottom edge. Fitted before any lighting is wired:

  1. Cut pelmet to length
  2. Drill clearance holes from inside the cabinet, every 400mm
  3. Offer up pelmet, screw from above into pelmet from inside cabinet
  4. Pelmet typically projects 5–10mm beyond cabinet face for clean line

If pelmet incorporates an LED light strip rebate, the rebate sits behind the pelmet, with diffuser or strip aimed downward at the worktop. Power cable runs above the wall cabinet to a switched fused spur (typically inside an end cabinet or via the kitchen lighting circuit).

End panels

Side panels at the end of a cabinet run (e.g. the visible side of an end-of-island cabinet) are scribed to the wall or floor, glued and pinned to the cabinet carcass:

The end panel must be:

Material handling tips

Frequently Asked Questions

How do I level the plinth on a sloping floor?

Scribe the plinth to the floor profile rather than trying to pack underneath. The cabinets above should already be level on their adjustable legs. The plinth follows the floor's contour, leaving a level top edge to meet the cabinets, with a tapered bottom edge meeting the floor.

Can I glue the plinth in place?

No. Plinths must be removable for cleaning, service access to plumbing, and access to cabinet legs for re-levelling over time. Always use the push-fit clip system supplied with the cabinets. Glued plinths cannot be removed without damage.

What's the difference between cornice and shadow gap?

Cornice is a decorative trim across the top of wall cabinets — traditional / shaker styles. Shadow gap is a 15–25mm void at the top of the cabinets (or under, between cabinet and ceiling), giving a clean modern finish without a moulded profile. Shadow gap is cheaper (less material, less fitting time) but requires the cabinet tops to be clean — no visible carcass.

How tight should the plinth fit to the floor?

Aim for 1–2mm gap, covered by the floor seal strip. Zero-gap fit looks impressive but doesn't allow for floor movement (timber, laminate, engineered wood all move seasonally). The seal strip is forgiving and contains the small gap visually.

Why does my cornice drop at the corner?

Two common causes: (1) the cabinet tops are not level — re-level the cabinets, (2) the corner mitre is slightly out of 45° and the cornice pulls down on the shorter side as it is fixed. Cut all mitres on the same saw setting in one session; check both pieces' angles before joining.

Regulations & Standards