How to Install Custom Cabinets: Essential Hardware Guide

August 25, 2026

Fitting bespoke joinery requires precise planning, the correct tools, and reliable furniture fittings. Whether you are fitting out a newly renovated kitchen, utility room, or living room alcove, knowing the core fittings required makes the entire process smoother and ensures your units remain level and sturdy for years to come. When you are installing custom cabinets, success relies on using the right hardware for levelling, mounting, and joining individual carcasses.

1. Base Units: Adjustable Legs and Plinth Clips

Uneven floors are standard in UK homes, whether you are dealing with modern concrete screeds or older timber floorboards. For this reason, base units should never sit directly onto the subfloor.

Adjustable Cabinet Legs: Heavy-duty plastic or steel cabinet legs screw directly into the base of the carcass. Most designs allow for height adjustments between 100 mm and 150 mm, letting you level the run perfectly using a spirit level or laser level before fixing anything to the wall.
Plinth Clips: These clip directly onto the legs and screw into the back of your kickboard, allowing you to conceal the gap underneath neatly while keeping the plinth easily removable for service access.

2. Wall Units: Cabinet Suspension Brackets and Hanging Rails

When installing custom cabinets at height, support hardware must bear significant weight from both the carcass and its contents.

Concealed Suspension Brackets: Fitted inside the upper corners of the carcass, these brackets hook onto a metal hanging rail fixed to the masonry or stud wall.
Adjustment Screws: Quality brackets feature internal adjustment screws. Once the unit is hooked onto the wall rail, you can turn these screws to adjust the height (vertical) and depth (horizontal) to draw the unit flush against the wall and align adjacent carcasses seamlessly.
Wall Fixings: Always ensure you use suitable wall plugs for solid brick or specialist hollow-wall anchors if fixing into plasterboard partitions.

3. Joining Carcasses: Connecting Screws and Sleeve Bolts

Individual cabinets need to be bound together to create a rigid, single structure. Relying purely on standard wood screws can cause panels to bulge or split.

Cabinet Connecting Bolts: Also known as male/female connector screws, these require drilling a 5 mm or 8 mm hole through two adjoining side panels. Tightening the threaded sleeve pulls the panels tight against one another without damaging the timber.
Clamping First: Always use G-clamps or quick-release F-clamps to hold the cabinet faces perfectly flush before drilling and tightening your connecting bolts.

4. Fitting Doors: Concealed Hinges and Mounting Plates

Once the carcasses are fixed to the wall and joined together, you can hang the doors. Most modern custom builds use European-style 35 mm concealed hinges.

Mounting Plates: These are fixed to the internal cabinet walls, often aligned with the standard 32 mm system drilling holes. Choose cross-shaped or inline mounting plates depending on your internal layout.
Hinge Adjustability: Modern clip-on hinges feature three-way adjustment (side-to-side, height, and depth). This lets you fine-tune the door reveals so all gaps around your custom doors are uniform.
Soft-Close Mechanisms: Integrated soft-close dampers prevent doors from slamming against the cabinet face frame or edge banding.

FAQ

How many connecting bolts should I use per cabinet joint?

For standard 720 mm high base or wall units, two connecting bolts (one near the top and one near the bottom, set behind the hinge line) are usually sufficient. For taller larder or utility units, use three to four bolts evenly spaced.

What is the benefit of a hanging rail over direct screw fixing?

A hanging rail spreads the load horizontally across multiple wall studs or masonry fixings. It also allows you to slide the cabinet along the rail into position before final tightening and micro-adjustments.