When constructing a kitchen, you can never butt up units that meet in a corner, right up to each other, as you will have problems opening doors or with doors hitting handles and getting damaged. That’s where corner post comes into affect.
The solution to this issue is to fit corner posts in each corner where the units go off at right angles. For example, if you had an L shape kitchen then you would have just the one corner post, if you had a U shape kitchen then you would have 2 corners posts, as shown in the diagrams below.
How big should the corner posts be?
We recommend that your corner post should be at least 40mm x 40mm, although this can increase or decrease depending on the kitchen that you choose to fit. Considerations that will affect the size of the corner posts are:
- The size of the handles and how far the protrude from the doors
- Appliance doors that open downwards
- Door thicknesses
All the corner posts that we sell come in 2 sizes:
- 720mm high by 100mm wide (Cabinet Material)
- 715mm high by 70mm wide (Door Material)
to be cut down as necessary to exactly fit the gap that is left between the units. You can see an example of a base corner post here.
Here is an example of a corner post being fitted. Corner posts can also be constructed from leftover door material, as used in this example.
As you can see in the image above, enough clearance has been given so that when the door is opened, the handle will not collide with the approaching door.
Moving the blanking panel on the corner unit
If you are buying all the pieces required (unit & corner post) then the blanking panel on the corner unit would need “moving” backwards. This is done by undoing the 4 screws that hold the blanking panel on and moving it back as required. (See above image and you can see why a service void is needed to accommodate this as the end of the panel goes into the free space).
Read What is a kitchen unit service void for more information on service voids.
Once the blanking panel has been moved backwards, this allows you to fit in a corner post like the one shown on the page below (Some of these corner posts do come as 2 separate pieces of material that are fitted together to create the right angled corner post).
When you have the units and corner post in position, you then butt the blanking panel back up to the corner post and screw it back in.
Remember, corner units have the blanking panel attached from the inside with 4 screws. This panel is removed and refitted once the corner post is in position.
How not to fit a corner post
The image below shows a corner post that has been fitted but only 1 side of it has been done. Although the door on the left opens, there is only a small 2mm gap between the door and the front of the door on the right. This corner post causes your kitchen to lose symmetry as well as the possibility of trapping your fingers as the door is closed and banging your knees as you have to stand out of the way to actually open this cupboard.
Ideally the handle on this door should really be placed on the other side to allow for easier access.
Straight Corner Base Unit Planning Tips
This is a short kitchen planning video, which explains how to plan your kitchen with a straight corner unit. The video also covers corner posts and service voids, which are essential in the planning of your kitchen, as they all take up space in your kitchen run.
Free Online Kitchen Planner
Download our mobile app
Looking for some kitchen inspiration? Take a look at some of our real customer kitchens, video reviews as well as advice in our mobile app. We’ll also keep you up to date with any new ranges and offers that we have available.
Up to 50% off competitor kitchen prices
At DIY Kitchens, not only do you get a quality rigid built kitchen but you also get it at a fabulous price too! Price your kitchen up on our site and you could see savings of up to 50% off other kitchen quotes that you’ve had.
Take a look at our kitchen price comparison page here.
Real customer kitchens
Get some inspiration for designing your own new kitchen with over 3,000 pictures of our customers’ kitchens that they ordered from us.
Could you do 2 x 150mm open face units (wine rack) instead of a corner piece?
Hi, there is nothing stopping you using a small unit in the corner, instead of a corner post. Some people use tray space units there to really maximise the storage space in the kitchen.
There doesn’t seem to be any blanking panel or brackets in the corner post that arrived with my kitchen, just 2 720mm filler pieces. Is this correct? If so what is the best way of fitting the 2 pieces together? Should there have been brackets or do I cut one to size and then screw through from the other?
Hi, the blanking panel is attached to the corner base unit. A corner post is created on site and attached to your units as you see fit. People tend to use modesty blocks (example here).
The filler panels should be the same height as the doors and the plinth is then returned at the bottom to cover any gap. The recommend size for a corner post is 70mm x 70mm (outside measurement, example here). If you need any further advice with this then our aftersales team will be able to help on 01977 608 418.
How do I fit the two corner post pieces? There are no screw holes. Do I glue one to the standard corner unit? How will the other one be fitted?
Hi, the corner posts are supplied in two separate 100mm pieces to be cut and mitered into an L shape corner post. The size of the corner post depends on the layout of the kitchen but the standard size is 70 x 70. In order to fix the two pieces together, we would recommend them to be screwed together through the back and then use modesty blocks to fix them to the units (example here).
I need a 50mm corner post – can Luca corner posts be easily cut down to this size? will this work even with the gloss finish?
Hi, the Luca corner posts are pre-formed meaning they arrive as a full piece, already pre-mitered. If you need to make modifications then we would recommend purchasing a door and cutting this down on-site, to form the corner post to the dimensions you require.
Buying L shape corner unit , do I need corner posts as well?
also, I wonder if the unit dimension are 900 x 900 what accrual space we need to fit it ?
Hi, no corner post is needed with an L-shaped unit. When you fit a 900×900 unit in the corner, it will stick out 900mm exactly, on each of the 2 walls it butts up against.
Does a corner post always consist of two 70mm pieces for a Malton bespoke corner unit which are included or do I need to get separately?
Hi James, corner posts are supplied with all our corner base units. The Malton corner post measures (715 x 70 x 20mm).
Hi – just planning our kitchen now and wish to have an ICBU-PWS internal curved unit in the corner of our kitchen (very similar to the layout on the front page of your kitchen planner pdf).
Can you advise whether corner posts are required with this? Im assuming not as there is no corner as such since it is taken up by the curved door?
Hi Dave, no corner post is needed with these types of units as the door curves around the area where a corner post would sit.
I’m almost at the ordering stage but one question:
We are having a 950 mm LeMans unit in one corner. Next to that there is approx. 110 mm space before the integrated dishwasher space. We were originally thinking of having a 100 mm corner post and setting the units off the wall by 10 mm.
If instead I put in a 100 mm open base unit (BT10-30) then would I still need a full corner post or could I get away with only one side of a corner post? I can’t see that the 100 mm open unit could cause any issues with the Lemans drawer (though might affect the look).
Hi, good question. I’ve not seen a kitchen with a 100mm open tray space in the corner but it technically it would work. You just need half a corner post the other side, so that the door can open without clashing onto the corner unit but in principle it will work.
Depending on your carcase colour and door colour, you may want to bring the open unit forward so that it lines up with the doors. Obviously, this may look a little strange if you have a white matt carcase and a white gloss door.
Hi, I’m planning an L-shaped bespoke painted kitchen. What material should I choose for the corner post in that case to match the painted doors?
Hi, the corner post will need to be in door material and will be visible on the page below, once you have selected the kitchen style from the top of the website.
I understand the principle of the “corner post”, but I cannot understand why the corner unit blanking plate requires “moving backwards” by 10mm.
Can you clarify this requirement please.
Hi, the blanking panel, in unit material is there to prevent items from falling out of the unit. When you use a corner post, the blanking panel needs taking off and pushing backwards to give space for the corner post to fit into. Once you have the corner post in position, you can then reattach the blanking panel. The 2nd image on the page above shows this. The 2 pieces with the light tops are the corner post being created. The dark bit is where the blanking panel has been pushed back. The amount you move the blanking panel back by will differ depending on the size of the corner post.
When fitting a 600 mm corner wall unit with a blank panel, do you need a corner post? I see with the base corner units the corner post is automatically added but they don’t for the wall unit, nor does the planner cut out of the corner wall unit show a void to allow for the post? Does the other wall unit which fits perpendicular to the wall unit with the blank simple fix to the blank?
Hi, a 30mm filler is required for the unit to correctly match a corner base unit with a corner post. We would advise either using pelmet or a cut down door to create the door finished filler.
we have ordered an inframe kitchen with corner posts but the hinges for both of the highline units are hinged in the corner, hence the handles are not being obstructed. Do we need the corner posts, or will the width of the inframe be enough ?
Hi, when ordering a straight corner unit, you always need a corner post.
The end wall of my U-shaped kitchen is 2360mm wide. I am hoping to fit two Le Mans units in the corners, and a central 600mm oven unit with two 300mm units (with doors), one either side. This adds up to 2320mm leaving only 40mm in total for corner posts. As I don’t have any drawers nearby for opening doors to interfere with, would I be ok to cut the corner posts down to 20mm by 70mm?
Hi, it is really hard to answer this without seeing a plan/sketch of the kitchen. If you can send your plan/sketch with your question on a support ticket below then the sales team will be able to have a look at it for you and get back to you.
Hi there, I’ve got all units, but struggling with corner posts.
Should they be leveled with door units, or with base units?
I do understand that one post goes in the gap which appears when blanking panel is moved,
I don’t understand which to make the second right. Level it with the doors? or not?
The corner post goes level with the doors.
Hi, please could you advise if it is possible to purchase a corner post for your 900mm tall wall units. If not, what is the best way to make one up.
Sorry but there are no corner posts available in that height, you can order an end panel or an extra length of plinth to create one.
I am fitting a hob into the corner using diagonal 900 x 900 corner unit next to a dishwasher on one side and a pull out larder on the other. Do I need to use fillers to allow the door to open, and if so, what type of filler and are they needed on both sides of the unit.
We would advise using a 22 degree corner post but it would be dependent on the kitchen style as to whether this can be made for you.
I’m planning on fitting a Luca Matt White kitchen and have a question regarding the corner post. I know that the corner post in door material comes in at around 700mm by 700mm but the space that I have to fill will be 400×400. Is it ok to cut this corner post down to size as it looks like it’s pre made and stuck together at 90 degrees already? If I did cut it to size, how would I get the outside edges white again as I imagine the wooden interior of the post would show through?
Hi, you are correct the corner posts are already joined. You can order some touch up paint to fix this issue, just add this in the comments section at the checkout.
On your Downloadable kitchen planner the voids are 130mm while on the above picture they are 100mm. Does that mean we can allow a void between those mesures?
The minimum service void that we used to recommend was 100mm, that would give a corner post of 40mm. But, we have since updated our recommendation to leaving a service void of 130mm to give a corner post of 70mm to ensure that handles on doors do not clatter when opened. The corner post can then shorten if necessary to allow the kitchen run to fit from left to right.
I prepared 100mm service void for 1000mm corner unit and It is NOT possible to get 40mm space. Once I moved the unit to 120mm I got it. Unless Im doing something wrong, and corners should be attached to line up doors, not units…
The service void will grow and contract based on the space that you have available in your kitchen run. The corner post is then cut down to suit.
I am doing a makeover of my kitchen units, already got the tops, and now changing all the doors to a different colour (white). As the blanking panel on my base unit is same colour as the doors now ( wood effect) will I able to get a white blanking panel without buying a base unit?
You can buy end panels from the page below.
Please note that for NEW kitchen orders, we do have a minimum order value of £750 as advised on the page below.
When fitting a 1000 base corner unit I need to leave a 100mm void at the corner (so effectively a 1100mm unit) so how can the 1000mm wall unit that is to be fitted above the corner unit be made to line up so wall and base doors line up vertically unless a 100mm filler piece is attached to the side of the wall unit going to the corner ? Have I answered my own question ? Bob.
A good question. Hopefully the page below will answer your question.
You may also find this page useful as well.
Hi, that’s a great help and had I looked harder would have found these answers were already available. Its going to be tight as the width of the kitchen is 1782mm and with the 600 and 1000 wall units plus a 150mm wine rack allowing 30mm for corner post will leave me 2mm. Walls are never plumb in an old cottage is there any way I can squeeze a few mm in my favour on the corner post ? If not will have to scrap the wine rack and infill the difference. Thanks for your prompt reply to my original question. Bob.
A good kitchen fitter can usually make things fit but I would be unable to comment as to whether you should remove the 150mm wine rack. It might be a good idea to get your kitchen fitter to have a look inside the kitchen first and see what they think to be 100% sure. Apologies that I could not help you any further.
As the blanking panel on a corner base needs to be “moved backwards” to fit the corner post, and then screwed back in after the corner post is fitted do I need to order a Corner Base ‘dry assembled’ or is the blanking panel already fitted without glue?
Hi, the blanking panel is just screwed in, no glue.
I am looking at ordering a kitchen but have a question about the corner posts. It looks like we are 15mm short of being able to fit a 70mm Door material corner post. It says above:
715mm high by 70mm wide (Door Material)
to be cut down as necessary to exactly fit the gap that is left between the units.
How do you cut this down without leaving a rough edge? Do they come in 2 pieces of door material that you cut down then screw together in an L shape? Would I be better off buying another door and cutting that down instead to make a corner post?
The corner post comes in two pieces, so that you can cut them to size and hide any rough edges so that they face inwards and will never been seen.
I’ve a technical question regarding corner posts that I hope you can assist me with.
I’ve been trying to measure up my kitchen but always get stuck when it comes to how much clearance to leave for the corner post. After researching this on your site and visiting many stores. I’m trying to find out if I have understood this correctly, so that I can size up and order a kitchen.
If I have understood it correctly; fitting a corner post is to facilitate the easy opening of doors on both sides of a corner, allowing for handles etc, so these will determine the actual size of the post.
Secondly, the corner post can be made up to be the same colour and flush with the carcase doors or it can be the carcase colour and flush with the carcase, am I correct?
The reason for my question is, I have been measuring up using your 900 highline base unit and I noticed that it has a 400mm door and a fixed 500mm panel.
Would the 500mm panel require reducing so that one side of the corner post would be flush with the 400mm door?
Maybe I’m just not seeing it, but it would appear that this would be the only way that the corner post (when made up), would be flush with the 400mm door.Obviously if this is the case then I would have to order a dry assembled carcase.
I’m afraid this issue has had me puzzled for some time and when viewing your diagram showing the side and service void. It appears that one section of the corner post is set into the corner carcase, therefore this would require the fixed panel to be reduced.
Many thanks for any assistance you can give me on this subject.
I’ll try answer each individual question separately.
(1) You are correct that the corner post is needed to facilitate the opening of doors in the corner area and at least 4cm is recommended for the corner post.
(2) The corner post can be made of carcase or door material if they are both a similar match. If you were having a high gloss door on your kitchen units then you would need to use door material for your corner post so that the post blends in.
(3) A very, very good question as there is more than one way of making a corner post.
The page below shows an example where 2 parts of the corner post were hand cut from door material and the 500mm panel set back to accommodate the 2 cut pieces, which might be confusing matters for you.
If you are buying all the pieces required (unit & corner post) then the 500mm blanking panel on the 900mm unit would need “moving” backwards. This is done by undoing the 4 screws that hold the blanking panel on and moving it back as required. (See above image and you can see why a service void is needed to accommodate this).
Once the 500mm blanking panel has been moved backwards, this allows you to fit in a corner post like the one shown on the page below (Some of these corner posts do come as 2 separate pieces of material that are fitted together to create the right angled corner post).
When you have the units and corner post in position, you then butt the 500mm blanking panel back up to the corner post and screw it back in.
I hope this makes things a little clearer. It racked my brains a little thinking about this one!