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Jul 14, 2026
Accurate door furniture measurements are essential for smoother installations, ensuring compatibility with both the door and its hardware. By taking these measurements before purchasing, you can help avoid returns and ensure the door and its furniture function correctly.
Correct door thickness measurements are essential for ensuring door furniture fits securely and operates smoothly. This measurement can be obtained by measuring from one side of the door to the other. It's particularly important when fitting door handles and door knobs, ensuring they fit properly on both sides of the door.
The industry standard thickness for most internal doors is 35mm, while exterior doors and FD30 fire doors often have a thickness of 44mm. More specialist doors, such as modern uPVC and heavy-duty insulated doors, are often thicker and may require door furniture that accommodates greater door depths.
The majority of doors are likely to fit within these standard measurements, but it’s still important to measure your door thickness before purchasing door furniture to ensure compatibility and reduce the risk of installation issues.
Door stile width refers to the width of the vertical sections of the door located on the outside edges. This consists of the hinge stile on one side of the door and the lock stile on the side where the door lock or latch is fitted. Properly measuring the door stile width helps determine which types of door furniture, including hinges, locks, latches, and door handles, are suitable for your door.
The stile width of a door is measured from the edge of the door to any moulding or panelling fitted to the surface. If the stile width is too narrow, the type of fixtures that can be installed is limited. When installing door knobs, positioning them in the mid rail section of the door proves an alternative if the stile width does not allow standard placement.
Door stiles are commonly around 95mm wide, but some specific doors can have stiles as narrow as 70mm, which is why it’s important to always measure your door stiles before purchasing any door furniture.
A backset measurement is the distance between the edge of the door to the centre of the spindle hole, keyhole, or lock cylinder. It's important to take accurate backset measurements when selecting door locks, latches, and door furniture.
Common backset measurements include:
When choosing door furniture with an appropriate lock or latch backset, the type of door and the hardware being installed should be considered. Glazed doors may require a shorter backset to help prevent the latch mechanism coming into contact with the rebate of the glass.
When fitting a door knob, a longer backset is often recommended to ensure the knob is fitted far enough from the door surface. Doing so will provide enough space to operate the door knob comfortably.
Measuring lock centres involves calculating the distance between the centre of the spindle hole and the centre of the lock hole. Different lock types require different centre measurements due to their design and configuration, so it’s important to complete this measurement before purchasing door handles, locks, or other door furniture.
The common centre measurements for popular lock types include:
Choosing compatible door furniture, including door handles, knobs, locks, and hinges, can transform the look and functionality of any door. The right furniture for your door will depend on factors such as the door type, measurements, and the aesthetic you want to achieve.
For example, traditional wooden doors with standard measurements are likely to be well suited to a wide range of classic door furniture styles, whereas modern or more specialist doors may require hardware designed to accommodate specific sizes or configurations. By evaluating your door and taking accurate measurements, you can outfit your door with compatible and suitable door furniture, avoiding unnecessary costs and reducing installation issues.
You’re now aware of the key measurements needed before fitting door furniture. Once these have been taken, you’ll have everything you need to purchase compatible furniture for your door. At IronmongeryDirect, we’ve been supplying our trade and DIY customers with a range of quality door furniture for years, helping to achieve reliable, professional installations.
No, while many UK doors follow standard sizes, they are not all the same size. Specialist doors, such as modern uPVC and heavy-duty insulated doors, can vary in size and thickness, so taking accurate measurements before purchasing is important.
To measure door backset size, measure the distance from the edge of the door to the centre of the spindle hole, keyhole, or lock cylinder. Taking this measurement accurately helps ensure the door furniture and locking components fitted are compatible and operate correctly.
Popular hardware finishes, such as matt black and antique brass, continue to be in style. Matt black is likely to remain a popular finish for modern environments, whereas antique brass offers a timeless and classic addition to traditional interiors.
No, all door handles do not fit every door, which is why it’s important to measure door thickness, stile width, backset, and centre-to-centre measurements before purchasing. Doing so helps ensure door furniture, such as door handles, are compatible with your door, fitting correctly and operating smoothly.
Door hinges do not have to match door handles, but matching finishes helps create a cohesive appearance. For example, matt black door handles are likely to create a more uniform look alongside hinges in the same finish rather than contrasting finishes such as antique brass.
