How Kitchen Cabinets Should Be Installed
Levelling, Fixing & Sealing On Site (2026)

Why the installation matters as much as the board

Custom cabinets arrive from the factory square and true. The kitchen they go into rarely is: floors slope towards the floor trap, walls bow, corners are out of square and the tiler may have left a lip at the wet kitchen. The installer's job is to absorb all of that so the finished run is level, straight and firm, and then to seal the kitchen against the water it will see every day.

When that is done badly, the symptoms show up months later: a stone top that cracks over a low spot, drawers that drift open, a gap opening between the top and the wall, and the particleboard under the sink going soft. ClickBina's custom kitchen cabinet process guide covers the ordering, deposit and timeline; this page covers what should happen on site.

Before the installer arrives

• Wet works finished: tiling, screeding and waterproofing done and cured, and the floor cleaned.
• Points in the right place: water, waste, sockets, hood power and gas positions match the approved drawing.
• Walls checked: brick or block where heavy wall cabinets go, or plywood backing already built into a drywall.
• Painting done up to the cabinet line, so the wall behind is sealed and the painter is not working around new doors.
• Access and protection: lift booking in a condo, and floor and door protection along the delivery route.

Drywall and gypsum partitions cannot take wall cabinets on ordinary plugs. If your kitchen has one, confirm that backing was built in or that the fixings are rated for that wall; our wall plugs and anchors guide explains the options.

The installation order

Levelling the base run

Everything else depends on the base run. A good installer finds the highest point of the floor along the run and sets every carcass to the same level line from there, adjusting each leg or packing the plinth. The run is then checked in both directions, front to back and along its length, with the doors off. A level base is what lets a stone top sit flat without rocking and lets the sink and hob cut-outs line up.

In a Malaysian wet kitchen, where the floor is washed, many owners prefer a raised concrete or tiled plinth rather than legs, so that mopping water never reaches the carcass bottom. Either way, the base panel of the carcass should never sit directly on a floor that gets wet.

Fixing carcasses to each other and to the wall

Adjacent carcasses should be screwed together through their sides so the run behaves as one unit, and the run fixed back to the wall so it cannot be pulled forward. Wall cabinets carry the most load for the fixing: plates, a filled cabinet and someone leaning on an open door. They should hang from a steel rail or adjustable hanging brackets fixed into masonry with plugs and screws suited to that wall, or into backing built into a drywall, never into bare gypsum.

Check the bottoms of the wall cabinets with a straightedge. A run that steps up and down by a few millimetres at every joint is a sign each cabinet was hung to its own mark rather than to one line.

Cut-outs for sink, hob, hood and sockets

Pipes and cables pass through the back and base panels of the carcasses. Those holes should be cut neatly to size, not smashed through, and the raw board edge around each one sealed, because a leaking waste or a dripping trap will otherwise soak straight into the core. Leave access to the angle valves, the gas valve and the waste trap; a sink base with a fixed back panel over the valves is a problem the day something leaks.

The hood needs a clear, short duct route through the cabinet above it, and the hob cut-out must follow the hob maker's instructions. Plumbing and electrical connections themselves are separate trades; coordinate them so the plumber and electrician come at the right point in the sequence.

Sealing: the step that decides how long it lasts

• Top to wall: a continuous sanitary silicone bead where the countertop meets the wall or backsplash.
• Sink: sealant around an undermount or inset sink, and the cut edge of the top or board sealed.
• Cut edges: every site-cut edge of particleboard, MDF or plywood edged or sealed, especially in the sink base.
• Plinth to floor: sealed, so mopping water cannot run behind the plinth.
• End panels and fillers: scribed tight to walls and sealed where they meet a wet area.

Most swollen sink bases trace back to an unsealed cut edge or a missing bead at the back of the sink. ClickBina's kitchen cabinet water damage guide shows what happens when these steps are missed.

What the cabinets cost, by carcass and door

Installation is normally part of the cabinet price per foot run. Indicative Klang Valley figures from ClickBina's cabinet process guide (2026):

Stone tops, the sink, tap, hob and hood, and the plumbing and electrical connections are usually priced separately. Ask for installation, levelling legs or plinth, fillers, end panels and sealing to be named in the quotation.

Your handover checklist

1. Put a spirit level on the countertop in several places, along and across.
2. Open and close every door and drawer; gaps should be even and doors should close flush without rubbing.
3. Look along the bottoms of the wall cabinets for a straight line.
4. Push gently on a wall cabinet; it should not move.
5. Look under the sink: valves reachable, holes neat and sealed, no raw board edges.
6. Check the sealant lines at the back of the top and around the sink are continuous.
7. Run water in the sink and check the trap and connections stay dry.
8. Check plinths and end panels meet the floor and walls without open gaps.

Installation mistakes that show up later

• Levelling each cabinet to the floor instead of to one line, so the top rocks or cracks.
• Wall cabinets on plugs in gypsum, which pull out under load.
• Carcass bottoms sitting on a wet floor with no legs or plinth.
• Service holes smashed through and left raw in the sink base.
• No sealant behind the top, so water from the backsplash runs down behind the run.
• Doors not adjusted at handover, leaving uneven gaps that owners live with for years.

How ClickBina can help

Kitchen cabinet jobs are quoted per project. WhatsApp us your job details for a quote: the kitchen layout, the rough length of the runs and the carcass and door material you are considering. ClickBina is an experienced KL & Selangor contractor for whole-house refurbishment and trade coordination, so the wet works, points and cabinets can be planned in the right order. We reply within the hour, the price we agree is a flat price with no hidden charges, and a site visit is RM150, waived if you go ahead.

Sources & methodology

• ClickBina custom kitchen cabinet process guide — per-foot-run rates by material, MR upgrade, typical set price, installation order.
• ClickBina kitchen cabinet water damage guide — failure points at the sink base.
• ClickBina wall plugs and anchors guide — fixings for masonry and drywall.

How we estimated prices: every RM figure on this page is quoted unchanged from the ClickBina guide named above; they are indicative Klang Valley ranges for 2026, not a price for your kitchen. The installation steps describe general good practice; the cabinet and appliance makers' instructions take priority where they differ.