What Is A Kitchen Corner Post? – (And Do You Need One?)

Often overlooked and easily forgotten, the kitchen corner post is a surprisingly integral element in both the design and installation of your kitchen.

In this post, I’ll explain what a kitchen corner post is and why you might need one as well as answer some popular questions on the topic.

Let’s get into it!

You May Also Like
The Best Corner Cupboard Storage Solutions For Your Kitchen

What Is A Kitchen Corner Post?

A kitchen corner post, also known as a corner filler or spacer, is a vertical piece of trim that is installed in a corner between two cabinets that are at a right angle to one another.

Its purpose is to create a small spacing and offset the two cabinets so that any doors and drawers can open freely without obstruction.

A corner post is either constructed out of two strips of cabinet material that are attached at a ninety-degree angle or it will come as a single moulded corner post piece.

One side of the post is attached to the end of one corner cabinet, while the other side is fixed to the face of the adjoining corner cabinet. (See image below ๐Ÿ‘‡)

This arrangement creates a hidden void between the two cabinets and along the wall behind them, which is concealed once the countertop is installed.

Some kitchen cabinets may be sold with the corner post attached to one of the corner cupboards.

Others require you to order one as a separate item or they may include materials to make a corner post up on-site yourself.

Kitchen corner post on blind corner cabinet
Single piece corner post on blind corner cabinet

Do You Need A Corner Post? (Yes, You Probably Do!)

A kitchen corner post provides a little bit of space and separation so that cabinet doors and drawers can open without bumping into the knobs or handles of the cabinet on the other side of the corner.

For instance: If you have a drawer in the corner and a cabinet facing it, the drawer won’t be able to open fully as it will hit the other door’s handle. (Example below๐Ÿ‘‡)

Since the corner post is constructed from the same material as the rest of the cabinetry, it looks like it belongs there. You likely have one in your kitchen and never noticed its existence

Besides its functional role, the corner post is integral to the overall design of the kitchen. It ensures that all adjoining units fit together seamlessly, contributing to the visual continuity and stability of the cabinetry.

If you decide to skip using a corner post, you will likely spend years complaining about doors or drawers that don’t work correctly.

Trust me, you need a corner post!

Cabinet drawer hitting oven handle and stopping it from fully opening. Kitchen design mistake
This is what happens when you don’t fit a corner post.

You May Also Like
What Is An Upstand? (And Do You Need One In Your Kitchen?)

How Big Should A Corner Post Be?

A standard corner post included in many self-install cabinets measures between 50 – 75mm wide (around 3 inches).

However, the size of a kitchen corner post typically depends on the specific requirements of your kitchen cabinetry and the design of the corner where it is to be installed.

The corner post will usually be the same height as your cabinet doors, so everything lines up and blends in.

If you are building a custom corner post, the width will depend on the door thickness and handle depth used on your cabinets.

Measure the depth of the hardware and add a few more millimetres for wiggle room. That is the width you need for one side of the corner post.

The other half of the corner post determines how big the void will be located behind the straight corner cabinet. This void can be useful for running pipes or hiding a crooked wall angle often found in older homes.

Remember that you will need to include the void in your calculations to determine the total length of your countertops.

Blind corner cabinet showing corner post and service void

You May Also Like
What Are Kitchen Corbels? (And Do You Need Them?)

Which Type Of Corner Cabinets Need A Corner Post?

The most common type of corner cabinet that needs a corner post is the blind corner cabinet. This is true for both base and wall cabinet versions.

The other scenario is if you have two sets of cabinets coming together at a right angle but choose not to put a corner cabinet in the space where they meet, you’ll still need a corner post.

Again, the corner post gives enough clearance for doors and drawers on both sets of cabinets to open and close easily without hitting each other, especially if you have handles on them.

As well as for structural support, helping in securely attaching the two sets of cabinets, ensuring they stay aligned and sturdy.

So, even without a corner cabinet, a corner post is important for both the functionality and stability of your kitchen cabinets where they meet at a right angle.

There is no need for a corner post if you have an L-shaped corner cabinet, an angled corner cabinet or a corner drawer cabinet.

You May Also Like
The Complete Guide To Standard Kitchen Cabinet Dimensions

Final Thoughts…

There you have it! Everything you need to know about kitchen corner posts.

While it may not be the most glamorous of kitchen design topics, it is an important one!

Ignore the corner post and you’ll have a poorly functioning corner cabinet in your kitchen. Or one that just straight-up doesn’t work! ๐Ÿ˜‚

Taking a minute to understand how they work and why you need one will mean your kitchen design can be fully functional. ๐Ÿ‘



Michael from

Michael is a kitchen designer from the UK. He's been designing and project managing new kitchen installations for over 10 years. Before that, he was an electrician and part of a team that fitted kitchens. He created Kitchinsider in early 2019 to help give people advice when it comes to getting a new kitchen.