How to Measure Your Cupboard for an Integrated Pull-Out Bin

Key takeaways

• Always measure the clear internal width, depth and height of the cupboard, not the external carcass size printed on plans.
• Leave at least 10–15 mm clearance in width and depth to allow for hinges, runners and slight wonkiness in older cabinets.
• Check for obstructions like pipes, sockets and siphons under the sink and measure around them, not just the widest part of the cabinet.
• Match bin frames to your unit size (300 mm, 400 mm, 500 mm or 600 mm) and use manufacturers’ minimum internal measurements as a hard limit.
• If you decide a built-in solution is not right for you, a simple 50 litre pedal or sensor bin such as the Tower sensor kitchen bin can be an easy alternative.

Understanding your cupboard and door type

Before you pick up a tape measure, it helps to understand what kind of cupboard you have and how the door is mounted. Pull-out bin frames are designed around these details, and choosing the wrong style can mean the door will not open properly or the bin will foul on the hinges.

Start by confirming the nominal width of your unit. This is the size designers talk about: 300 mm, 400 mm, 450 mm, 500 mm or 600 mm. It refers to the outside width of the cabinet, not the usable internal space. Most integrated pull-out bins are marketed as ‘for 300 mm units’ or similar, but the fine print will always give a required internal width that is slightly smaller – that is the crucial number you will be checking against.

Door types: in-frame, overlay and handleless

The way your door is fitted affects both internal space and the type of bin kit you need:

• Overlay (standard) doors – The door sits on the front of the cabinet and covers the carcass edge. This is the most common type in many homes. Hinges are usually standard concealed hinges screwed into the side panel.
• In-frame doors – The door sits inside a visible frame around the opening. The frame slightly reduces the opening width and height, which reduces what you can fit inside.
• Handleless kitchens – These often have a rail or channel above the door for your fingers. Some integrated bins are designed specifically to clear that channel and align properly with the push or pull action.

If you know you have a handleless layout, it is worth reading a focused overview of integrated bins for handleless kitchens so you can cross-check your measurements with the right type of kit.

Tools and preparation

You do not need anything complicated to measure for a pull-out bin, but a few simple tools make it easier and more accurate:

• Metal tape measure (5 m is more than enough)
• Pencil or fine marker
• Paper or notebook for jotting down dimensions
• Small spirit level (optional, but handy if your floor is uneven)
• Masking tape (optional, for mock-lining the footprint of the bin frame)

Empty the cupboard you are measuring and remove any existing freestanding bin, caddy or cleaning products. If it is an under-sink cupboard, clear out bottles and trays so you can clearly see pipework, waste traps and any electrical sockets. Open the door fully, ideally as far as it will naturally go, so you can see where the hinges protrude inside the cabinet.

Tip: Take all your measurements twice – once quickly, once carefully – and write down both. If they differ, measure again and work with the smaller value when checking bin specifications.

Step 1: Measuring internal width (and allowing for hinges)

Internal width is usually the limiting factor when choosing a pull-out bin. A carcass that is sold as 400 mm wide may only have around 362–368 mm of usable internal width once you account for side panel thickness and any internal fittings.

How to measure cupboard width

1. Measure from inside left panel to inside right panel at the front of the cupboard opening (just behind the door frame or carcass edge). Note this as ‘internal width – front’.
2. Measure again across the middle and then at the back of the cupboard. Note these as ‘internal width – middle’ and ‘internal width – back’.
3. If any measurement is smaller than the others, that is the one that matters. Cabinets are rarely perfectly square, and runners need the tightest point to be big enough.

Next, look carefully at your hinges:

• Open the door fully and see how far the hinge arm sticks into the cabinet at the point where your bin frame will sit.
• Measure from the inside of the hinge or hinge plate on one side to the inside panel or hinge on the other. This gives you the clear width between obstructions.

Width tolerances and example measurements

Most pull-out bin frames are 10–20 mm narrower than the nominal unit size. As a rough guide (your specific product will give exact figures):

• For a 300 mm unit, you might need a minimum internal width of around 262–270 mm.
• For a 400 mm unit, typical minimum internal width is around 362–370 mm.
• For a 500 mm unit, expect a minimum internal width of somewhere around 462–470 mm.
• For a 600 mm unit, minimum internal width is often around 562–570 mm.

To avoid headaches during installation, try to leave at least 10–15 mm of spare width beyond the quoted minimum whenever possible. For example, if your 400 mm unit measures 370 mm clear between hinges, a bin that needs 362 mm should fit comfortably.

Step 2: Measuring depth and plinth clearance

Depth is the distance from the very front inside edge of the cabinet to the back panel (or to the obstruction that reduces depth, such as pipework or a socket). Pull-out runners need enough depth to screw securely into the base of the cabinet, and the bin buckets themselves must not collide with the back wall or pipes when fully extended.

How to measure cupboard depth

1. Place the end of the tape against the inside front edge of the cupboard base, just behind the door.
2. Extend the tape straight to the back panel at floor level and note this as ‘total internal depth’.
3. If you have a service void (a gap between the back of the cabinet and the wall), measure to the inside of the cabinet back, not to the wall.

Now check for anything that sticks out inside the cupboard:

• Waste pipes or traps under the sink
• Water supply pipes
• External socket boxes or isolation switches
• The base of the sink bowl hanging down

Measure from the front inside edge to the point where the obstruction first intrudes, and then from the obstruction to the back. If the obstruction is low down, it may interfere with the runners; if it is higher, it may only affect bucket height (we will cover that in the next step).

Depth tolerances and real-world examples

Standard kitchen cabinets are usually around 560–580 mm deep externally, giving an internal depth in the region of 500–520 mm. Many bin frames are designed for a minimum depth of 480–500 mm. As a safe rule:

• Leave at least 10 mm spare beyond the manufacturer’s minimum depth if you can.
• Where pipes are positioned towards the back, aim for a clear depth of 480 mm in front of them for the bin frame and buckets.

If your cupboard is shallower (for example, due to a double-thickness back or a large void), look specifically for ‘short-depth’ or ‘slim’ pull-out bins that list a smaller minimum depth. In extreme cases, if depth is very tight and you cannot find a suitable pull-out unit, a freestanding option such as a compact 50 litre pedal bin may actually be more practical.

Step 3: Measuring height and checking for sinks and shelves

Height is where under-sink bins most often run into trouble. The bin buckets need enough vertical room to slide in and out without hitting the underside of the sink, any low shelves or the horizontal rails of an in-frame cabinet.

How to measure cupboard height

1. Measure from the top surface of the cupboard base to the underside of the worktop or the underside of the sink bowl or shelf, whichever is lowest at the point where the bin frame will sit.
2. If there is a shelf that could be removed, measure both with and without it so you know your options.
3. For in-frame doors, measure from the base to the bottom of the frame opening, as the frame usually reduces the usable height compared to a standard overlay door.

Height tolerances and typical bin sizes

Pull-out bin frames and buckets come in lots of different heights. As a rough sense-check:

• Shallow, multi-bucket under-sink systems might need around 350–450 mm of clear height.
• Larger, deeper buckets for bigger units may need 450–550 mm or more.

Manufacturers usually give a minimum internal height. Try to have at least 20–30 mm of extra clearance beyond that so the lids, handles or bag overhangs do not scrape the sink or shelf when you pull them out.

If your measurements are tight under the sink, consider a lower-profile system or splitting your waste with smaller multiple buckets rather than forcing one tall bin into a cramped space.

Step 4: Allowing for runners, doors and plinths

Pull-out bin kits rely on runners that fix either to the base or the sides of the cabinet, or to a metal frame that then fixes down. While the runners themselves are usually accounted for in product dimensions, there are a few extra clearances to keep in mind.

Side runner clearances

If the bin system fixes to the sides of the cabinet, the given minimum internal width already includes the space for runners. Still, it is smart to:

• Make sure the sides are flat and clear where the runners will sit, with no internal battens or corner posts in the way.
• Check that hinge plates are not exactly where runner screws need to go; if they are, you may need to adjust hinge placement or choose a base-fix bin.

Door movement and plinth clearance

Think about how the door moves and what sits below it:

• For kits that attach the door to the front of the pull-out, ensure there is enough space for the door to swing slightly on its hinges as the runners move.
• Check that the plinth (kickboard) below the cabinet does not interfere with the bottom front of the bin frame or with the bin bucket when pulled out. There is usually a recessed area built into the frame, but low or proud plinths may still be an issue.
• If your floor is not perfectly level, leave a few millimetres of vertical wiggle room so you can adjust the frame and door alignment.

Step 5: Accounting for pipework, traps and cables

Under-sink cupboards often appear spacious at first glance but are interrupted by waste traps, water pipes and cables. Measuring only the widest point will give you an unrealistic idea of what will actually fit.

How to map obstructions inside the cupboard

1. Identify the main obstruction (often the waste trap or the underside of the sink bowl).
2. Measure from the left internal panel to the near edge of the obstruction, then from the right panel to the near edge. This tells you if the obstruction is centred or offset.
3. Measure from the front inside edge of the base to the near edge of the obstruction. This is where the front of your bin frame will sit relative to it.
4. Measure the height of the obstruction from the base. For example, the bottom of the sink bowl may be 300 mm above the base at the front and 260 mm at the back.

Visualise the bin buckets as rectangles within this space. The front part of the cabinet is usually clear and ideal for the taller part of the bin, while the area directly under the sink bowl may only suit a shorter bucket or nothing at all.

If pipes are badly in the way, it can be cheaper and easier to choose a narrower or shorter bin system than to pay for alterations to the plumbing.

Step 6: Matching bin frames to 300, 400, 500 and 600 mm units

Once you have width, depth and height measurements (including any obstruction limits), you can start to match them to suitable bin systems. Most manufacturers clearly label kits for specific unit widths, but always verify the fine-print internal dimensions.

300 mm units

These are narrow and best suited to smaller bins or two modest buckets rather than large-capacity solutions. In many 300 mm cupboards, under-sink pipework or a drawer above reduces height even further. Look for:

• Compact pull-out frames with one or two small buckets
• Systems advertised for internal widths around 260–270 mm
• Shorter bucket heights if installed under a sink

400 mm units

These are a common sweet spot for pull-out bins, especially in smaller kitchens. You can typically fit:

• Two moderate buckets for rubbish and recycling
• Or one main bucket and a smaller caddy for food waste

Check that your internal width matches the bin’s stated minimum (often around 362–370 mm). If your kitchen is particularly compact and you are struggling with space, it may also be worth reading about the best under counter bins for small kitchens to see how others make 400 mm units work hard.

500 mm units

These offer a generous amount of space, so you can usually fit larger bins or more compartments for detailed recycling. Common configurations include:

• Two larger buckets side by side
• Or three to four smaller buckets for separating glass, paper, plastics and general waste

Internal width requirements will typically fall in the 462–470 mm range, with standard full-depth runners requiring at least 480–500 mm internal depth.

600 mm units

These are ideal if you want generous capacity or lots of recycling compartments. A 600 mm unit will usually accommodate:

• Very large main waste buckets
• Multiple smaller caddies for recycling and food waste

Internal width is usually around 562–570 mm or more. Height under the worktop is usually ample unless you are dealing with a very deep sink or a drawer-line cabinet with an internal rails layout.

How much clearance is really needed?

People often ask how precise you must be with measurements. While the exact tolerance depends on the specific bin kit, a few rules of thumb are helpful:

• Width: Aim to have at least 10–15 mm more than the manufacturer’s minimum internal width, especially in older or less-square cabinets.
• Depth: Leave 10 mm beyond the minimum, and more if the back panel is not perfectly straight or if there is a slight lip at the front of the base.
• Height: Give yourself 20–30 mm extra above the minimum height for comfortable operation and to allow for bag overhang or lids.

If your measurements are only just at or even a millimetre under the minimum, treat that as a warning sign. In those cases, either choose a more compact bin system or be prepared to adjust the cabinet (for example, trimming a false back or removing a thin shelf) if you are confident and competent to do so.

What to do if pipes or obstacles are in the way

Under-sink pipework is one of the most common reasons people end up abandoning an integrated bin and going back to a freestanding model. However, there are usually a few strategies worth trying before you give up.

• Shift the bin forwards: Many pull-out frames allow you to position them towards the front of the cabinet so the tall part of the bin clears the pipes at the back.
• Choose a staggered-height system: Some multi-bucket kits have lower buckets at the back and taller ones at the front, making them perfect for awkward sinks.
• Use a narrower frame: If a central waste trap blocks the middle, a slimmer 300 mm or 400 mm system installed off-centre in a wider cupboard can work well.

If none of those options work and altering the plumbing is not appealing, it might be simpler to choose a quality freestanding bin that can live elsewhere in the kitchen. A robust pedal design like the Addis 50 litre kitchen bin or a lidded 50 litre sensor model such as the Tower sensor bin can be an effective and mess-free alternative.

Choosing how large a bin will actually fit

Once you know that a given bin frame will physically fit inside your cupboard, the next question is: how much capacity is practical for your household? Bigger is not always better if it leads to overfilled bags or smells.

• Small households or frequent emptying: Two smaller buckets (for example, 2 × 15–20 litres) can be more than enough and are easier to lift out.
• Family homes: In a 500 mm or 600 mm unit, many people find that a paired system of around 30–40 litres for general waste plus 20–30 litres for recycling strikes a good balance.
• Recycling-heavy households: Look for triple or quadruple-bucket setups and consider keeping food waste separate in a caddy or a compact freestanding bin for hygiene.

It can help to compare the capacity of your planned integrated bin with your existing freestanding one. If you are used to a 50 litre pedal bin like the Songmics soft-close kitchen bin, you may want a combined pull-out capacity that is similar or only slightly smaller so your bin-emptying routine does not change dramatically.

Double-checking your measurements before you buy

Before you commit to a particular pull-out bin, it is worth taking a few minutes to cross-check your numbers against the product data.

1. Confirm the unit size: Make sure the bin is designed for your cupboard width (300, 400, 500 or 600 mm).
2. Compare all three dimensions: Check your smallest internal width and depth and your lowest usable height against the product’s minimums.
3. Allow tolerances: Ensure you have a bit of spare space in each direction (ideally 10–15 mm width/depth, 20–30 mm height).
4. Visualise the movement: Think about how the frame will slide out, what the door does, and whether anything might clash as you pull the unit to its full extension.

If you are still deciding between a built-in pull-out and a simpler freestanding solution under the sink, it can help to read a direct comparison of pull-out versus freestanding under-sink bins to see which matches your kitchen and habits best.

Conclusion

Getting an integrated pull-out bin to fit smoothly is all about measuring carefully and thinking in three dimensions. Once you know your true internal width, depth and height – and how far hinges, pipes and sink bowls intrude – it becomes much easier to choose a bin kit that will glide in and out without knocking into anything.

For many cupboards, especially 400 mm and 600 mm units, there is a wide choice of pull-out systems that can turn an untidy under-sink space into a neat, organised recycling station. For others, particularly where pipework dominates or cabinets are unusually shallow, it is sometimes more practical to choose a well-made freestanding bin, such as a lidded pedal or sensor model like the Addis utility bin or the Tower sensor bin.

Whichever route you choose, a few extra minutes with a tape measure now will save you the frustration of a bin that almost fits but not quite – and help you enjoy a kitchen that works the way you want it to every day.