How to Fit Kitchen Units: Step-by-Step Hardware Guide

August 25, 2026

Installing a new kitchen is one of the most rewarding home improvement projects you can undertake. While the carcasses provide the framework, the structural integrity, alignment, and longevity of your kitchen rely heavily on the fittings you choose. Understanding how to fit kitchen units with precision hardware ensures your cabinets remain level, rigid, and safely anchored to the wall for years to come.

Essential Hardware and Tools for the Job

Before you begin, gathering the correct hardware and tools will make the installation process significantly smoother. You will need:

Adjustable cabinet legs: Essential for supporting base units and compensating for uneven floors.
Cabinet connector bolts: Threaded sleeve bolts (usually M4 or M6) used to bind adjacent carcasses tightly together.
Concealed cabinet hanging brackets and wall plates: For suspending and micro-adjusting wall units.
Wall plugs and heavy-duty screws: Matched specifically to your wall type (masonry or plasterboard).
Spirit level: A 1200 mm level is ideal for checking across multiple units.
G-clamps or quick-release clamps: To hold carcasses flush while securing them.

Step 1: Preparing and Setting Out the Room

Never assume your floor is flat or your walls are plumb. Start by finding the highest point of the finished floor along the run of units. Measure up from this point to mark the top line of your base carcasses (typically 870 mm to allow for a standard 900 mm worktop height including a 30 mm worktop).

Use a long spirit level or a laser level to project horizontal datum lines around the entire room for both base and wall cabinets. Check the corners of the room for squareness, as this determines where to place corner base posts and filler panels.

Step 2: Assembling and Levelling Base Units

Fit the adjustable cabinet legs into the mounting blocks on the underside of each base carcass. Standard installations use four legs per cabinet, positioned roughly 50 mm to 70 mm in from the front and back edges.

Position your corner unit first, as this establishes the run in both directions.
Adjust the screw-thread feet on the legs until the top of the carcass aligns perfectly with your datum line.
Use your spirit level across the front, back, and diagonals of the unit.
Position the adjacent base unit, align it to the first, and adjust its legs to match the height.

Step 3: Joining and Securing Base Units

When learning how to fit a kitchen unit alongside another, alignment is critical. Clamp the two side panels together using G-clamps with protective wood blocks to avoid marking the MFC surface.

Drill through the pre-drilled hinge plate holes or create dedicated 5 mm holes through both gables. Insert steel connector bolts and tighten them until the front edges are perfectly flush. Once the entire run is joined and checked for level, anchor the carcasses back into the wall using small L-brackets and appropriate wall fixings to prevent any forward tipping.

Step 4: Installing Wall Units with Hanging Brackets

Wall units carry substantial weight, so secure fixing is paramount. Modern kitchen installations rely on adjustable hanging brackets fitted inside the top rear corners of each wall carcass.

Fix the wall plates or suspension rails: Mark the wall line, drill, and firmly screw heavy-duty steel hanging plates into solid masonry or the timber studs of a stud wall.
Hang the cabinet: Lift the unit onto the plates so the bracket hooks engage firmly.
Adjust for level and depth: Use the two adjustment screws on each bracket. One screw raises or lowers the cabinet, while the other pulls the unit tight against the wall.
Bolt wall units together: Just like base units, clamp adjacent wall cabinets flush and secure them using cabinet connector bolts.

Frequently Asked Questions

What fixings should I use for plasterboard walls?

For stud walls, always try to anchor hanging plates directly into the vertical timber studs. If a fixing must land on hollow plasterboard, use heavy-duty metal cavity anchors or install a continuous timber pattress behind the plasterboard prior to fitting.

How many connector bolts do I need between units?

A standard 720 mm high carcass requires at least two connector bolts—one positioned near the top front edge and one near the bottom front edge. For tall larder units, use four to five bolts evenly spaced along the height.