Cupboard Knobs Explained: Sizes, Fixings, Styles and Finishes

Supplied by Trade Door Handles, trusted UK supplier of architectural ironmongery since 1976, with quick nationwide delivery.

At Trade Door Handles we supply a large range of architectural ironmongery and hardware for the home, workplace, schools, colleges and other commercial settings. As part of T.H. Wiggans Ironmongery Ltd, we have supplied the trade and the public since 1976, with trade counters in Kendal and Carlisle and large display areas where local people and tradespeople can see the products in person. We stock and supply a huge range of cupboard knobs in every popular size, finish and style, from leading names such as Carlisle Brass, Zoo Hardware, Heritage Brass and From The Anvil, alongside British makers like Samuel Heath, Frank Allart, Croft Hardware and Kirkpatrick.

Cupboard knobs are one of the simplest and most versatile fittings you can buy, yet the right knob completely changes the character of a kitchen or a piece of furniture. This guide explains what cupboard knobs are, the sizes and fixings you need to know, the styles and finishes available, and the suppliers we trust.

A cupboard knob is a single-point handle, gripped between finger and thumb, that lets you open a cabinet door or drawer. Also known as cabinet knobs, they are the classic choice for shaker, country, Georgian and traditional kitchens, and they suit almost any style of furniture. Because a cupboard knob fixes at a single point, it is quick to fit and easy to live with.

These knobs do two jobs at once. They are functional, giving you a comfortable grip, and they are decorative, acting as the jewellery of a room. Swapping tired knobs for a fresh set is one of the quickest and most affordable ways to update a kitchen, and it is a job most people can do with a screwdriver.

Most cabinet knobs are made from solid metal for strength and a quality feel, then plated or lacquered in a chosen finish. Common materials include:

• Solid brass - a premium, hard-wearing base used for satin brass, antique brass and polished brass finishes.
• Stainless steel and zinc alloy - durable, cost-effective options for modern schemes.
• Iron and pewter - favoured for traditional, rustic and period styles.
• Ceramic, porcelain and wood - decorative knobs for country, shaker and vintage kitchens; ceramic often has a painted or patterned face, while turned wooden knobs add a warm, natural touch.

Popular finishes include satin brass, polished chrome, satin nickel, matt black, antique brass and pewter. Choosing one finish and carrying it across your knobs and handles gives a co-ordinated, considered look.

Cabinet knobs are measured by the diameter of the knob. The three most popular sizes are 25mm, 32mm and 38mm, which suit the majority of kitchen and cabinet doors and drawers. As a rough guide, smaller 25mm knobs suit small doors and delicate furniture, 32mm is the all-rounder, and 38mm gives a bolder, more substantial look on larger doors and pan drawers.

You are not limited to those sizes, though. They are available over 50mm in diameter for statement pieces, larger furniture and feature cabinets. If you are mixing knobs across a kitchen, it often looks best to keep one size on the doors and step up a size on the drawers.

Almost every cupboard knob fixes with a single threaded bolt that passes through the door from the back and screws into the knob. That threaded bolt is usually an M4 size, which is the industry standard for cabinet knobs across the vast majority of UK brands.

Most cabinet knobs are designed to fit standard 18mm to 20mm thick cabinet doors. Here is the practical bit worth knowing: some manufacturers supply their knobs with a choice of bolt lengths to suit different door thicknesses, while others include only a single length. If the supplied bolt is too short for a thicker door, it is an easy fix - we can offer longer M4 threaded bolts so you can fit the knob to almost any thickness.

Yes, and it is a very popular thing to do. Fitting a cabinet knob to a full-size door gives you a neat knob to pull the door open, and it is especially common on newly fitted wardrobe doors. The key is bolt length: most internal doors are around 35mm thick, so the standard cabinet bolt will be too short and you will need a longer M4 bolt to reach through. It is also worth sizing up - a small knob can look a little lost on a full-size door, so we would suggest fitting a larger cabinet knob of 38mm or more so it stays in proportion.

Beyond size and finish, they come in several distinct styles. The four we are asked about most are:

A knob on a rose sits on a small round backplate (the rose) that covers the fixing area and gives a neat, finished look. It is the most common modern format and works in almost any setting.

A knob on a longer or decorative backplate adds a more traditional, period feel and covers a larger area of the door - useful on older doors or where you want a more decorative statement.

Ceramic knobs bring colour, pattern and a soft, tactile finish. They are a favourite for country, shaker and cottage kitchens, and pair beautifully with brass or pewter bases.

Knurled knobs feature a fine, cross-hatched texture that has become hugely popular in contemporary kitchens. The knurling adds grip and a premium, tactile detail, and looks especially good in brass, black and chrome.

Yes, some ranges do - though it is worth knowing that many do not. Where a range offers matching knobs, bar handles and cup pulls in the same finish and style, you can mix formats without breaking the look, and a common approach is knobs on the wall cabinets and doors with pull handles on the deeper drawers. If a fully co-ordinated set matters to you, it is worth checking the range before you buy, as not every design comes in every format. Browse our full range of Kitchen and Cabinet Pull Handles to pair with your knobs.

It is a common myth that these are only for kitchens. In practice, cupboard knobs work almost anywhere you have a door or a drawer:

• Bathroom cabinets and vanity units
• Bedroom furniture, dressers and chests of drawers
• Fitted and freestanding wardrobes
• Sideboards, dressers and display cabinets
• Home office and utility units

There is also one thing well worth knowing when you order a new kitchen: you do not have to take the standard knobs offered by the kitchen supplier. Fitting your own choice of cupboard knobs is one of the simplest ways to make a mass-produced kitchen feel unique and bespoke, and it usually gives you far more choice and better value than the supplier's upgrade option. Explore our full range of Kitchen and Cabinet Knobs to find a style that is yours.

Because a cupboard knob fixes with a single bolt, it is one of the easiest ways to transform a piece of furniture, whether new or old. Swapping the cupboard knobs on a tired dresser, wardrobe, sideboard or chest of drawers instantly updates it, and it is a favourite trick for breathing new life into a second-hand or auction find. A characterful set of knobs can turn a plain or dated piece into something that looks bespoke, at a fraction of the cost of replacing the furniture.

The finish you choose sets the tone:

• Ceramic and wooden knobs add warmth and character, ideal for painted furniture, country pieces and vintage restorations.
• Lacquered brass keeps its bright, polished shine with almost no upkeep, so it stays looking the same for years.
• Unlacquered and burnished brass is left to age naturally, developing a living patina that suits period and rustic furniture.
• Satin nickel pairs neatly with satin stainless steel kitchen appliances, tying your knobs in with your oven, fridge or extractor for a co-ordinated look.

Mixing a modern finish on an old piece, or a traditional knob on a new unit, is a simple way to make a space feel considered and unique.

We supply knobs from some of the leading suppliers in the country, so you can choose from budget-friendly ranges right up to premium, handmade pieces.

Carlisle Brass has two of the largest ranges of cabinet hardware in the country. Finger Tip Design, also known as FTD, offers an enormous choice of knobs across traditional and contemporary styles, while Alexander and Wilks is a strong choice for on-trend designs including knurled knobs in fashionable finishes.

From The Anvil is the go-to for rustic, blacksmith-style hardware, with beautifully made iron, pewter and aged finishes ideal for country and period homes.

Heritage Brass, by M. Marcus, offers a refined range of solid brass knobs in a wide spread of classic and modern finishes.

For a premium option, the Hoxton range is known for its high-quality knurled cupboard knobs and designer finishes, perfect when you want a statement.