How to choose a corner wall unit


When designing your new kitchen, the corner can be one of the most difficult areas to plan, especially when it comes to which corner wall unit to use and how it will fit in with the units next to it and corner posts.

The article below will give you a few options to choose from, as well as considerations to make before deciding upon the corner wall unit that is right for your new kitchen layout.

Standard corner wall units

If you are using one of the standard corner wall units, where a 300mm blanking panel is used to butt up against the unit on the adjacent run then you are going to need a 30 x 30mm wall corner post to cover the gap left in the corner, after you have placed the unit 30mm from the wall, to allow the door on the corner wall unit to open.

30mm x 30mm wall corner post required

The 30mm gap from the wall  also allows your wall units to line up with the 70 x 70mm corner post that is required for the corner base unit below it.

A few useful bits of information to remember here are:

  • A corner wall unit blanking panel is always 300mm wide
  • A corner base unit blanking panel is always 500mm wide.

The 2 images below show examples of a wall corner post that has been used to fill the gap between 2 wall units. The wall corner post is made using cut down bits of filler panels in door material.

Corner Wall Unit

Corner Wall Unit With Corner Post

L-shaped or angled/curved corner wall units

When using an l-shaped corner wall unit (600mm x 600mm), no wall corner post is required, as the doors open up in the area where the corner post would be.

Corner Wall Unit Corner Wall Unit Corner Wall Unit Corner Wall Unit

Some people use angled or l-shaped corner wall units to negate the need for a wall corner post but using these units would require that your service void on your corner base unit be reduced to 100mm from 130mm, to give a 40 x 40mm corner post on the base unit, so that 600mm was achieved to keep the wall and base units lined up. A base unit is 560mm deep + 40mm corner post = 600mm (the same size as the l-shaped corner wall unit 600mm x 600mm).

If you had a 70mm x 70mm base unit corner post then it would be 30mm too wide for the wall unit to line up, as shown below.

40mm x 40mm base corner post

When using an l-shaped corner wall unit, in order to get the corner base unit to line up below it, so that the doors are directly in line with each other, the corner post for the base unit below it needs to be 40mm x 40mm. Please be aware that a smaller corner post can increase the possibility of handles clashing.

If using an l-shaped 600mm x 600mm corner wall unit, to help keep base units lined up below, it would be ideal to use a 900mm x 900mm l-shaped corner base unit as well, as shown below.

L shaped corner wall unit and base unit

All the corner wall units available to buy for your new kitchen can be found here.


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9 thoughts on “How to choose a corner wall unit”
  • Simon says:

    How wide are the corner doors that are L shaped

    February 15, 2024 at 7:28 am
    • DIY Kitchens says:

      Hi Simon, the sizes for the doors are shown below.

      L shape corner base unit have two 715mm x 314mm doors
      900mm high corner wall units have two 895mm x 297mm doors
      700mm high corner wall units have two 715mm x 297mm doors

      February 15, 2024 at 2:27 pm
  • elizabeth murdoch says:

    I have a very small kitchen. Is it possible to install a ceramic hob half (300mm) of which is over an L-shaped corner unit, and half (300mm) of which is over a 300mm drawer unit? Straddling the two . .

    January 8, 2022 at 5:49 pm
    • DIY Kitchens says:

      Hi, the hob actually fits into the worktop and can protrude slightly into the units below, if the hob is bigger in depth. You just need access to a plug socket and for the wire to reach it. If the hob is deep then you may need to trim some off the top of the side of a unit, if the bottom of the hob was going to hit it.

      January 11, 2022 at 8:40 am
  • Phil C says:

    On your corner wall unit the door is mounted to the blank panel, so when the unit is mounted 30mm from the wall the door then has to be mounted on the corner post to fit. Do you realise that this the case as the hinge mountings have to be moved and fitted to the corner post??

    March 1, 2020 at 11:38 pm
    • Diy Kitchens says:

      Hi Phil, the doors and hinges for our straight corner wall units are hinged on the centre panel, this is not hinged on the corner post or blanking panel. If you need any further assistance with this question then our aftersales team will be happy to help on 01977 608 418.

      March 2, 2020 at 2:21 pm
  • Phil says:

    I have an L shaped kitchen that butts up to walls at either end. We opted for a corner base unit and used laminate worktops. It wasn’t until I came to fit them that I realised you cannot join the two worktop pieces with a mason’s mitre because the corner base unit has a solid top, so no access underneath to tighten the clamps that hold the joint tight. Because of the sizes and the walls at each end, I didn’t have the option to join them and install them after joining either. We ended up having to use a joint strip, which wasn’t ideal. Something to bear in mind.

    February 11, 2019 at 10:05 am
  • Mike I says:


    I’m currently designing my kitchen, which is U-shaped, so it will have two corners. It seems that using L-shaped corner base and wall units is much simpler than using standard corner units. Are then any down sides to using L-shaped corner units?


    December 5, 2018 at 12:11 pm
    • Diy Kitchens says:

      Hi Mike, L-shaped corner units negate the need for a corner post and planning can be much easier with them. The only issue you’ll have is that all the units will have to fit perfectly from wall to wall, otherwise any space left will have to be filled with a filler panel, somewhere in the run. If you were using a corner post then the post could grow or contract slightly to absorb the space left. I hope this helps.

      December 5, 2018 at 1:49 pm
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