What Size Computer Desk Do You Need for an Under-Stairs Space?

For most under stairs spaces in UK homes, a computer desk between 80cm and 120cm wide and around 45cm to 60cm deep is the size that works. The width is set by the section of the stairs where you can still sit upright, not by the full length of the void, and the depth is limited by how far the desk can project before it starts to narrow the hallway. A laptop user can manage with 80cm by 45cm. Someone using a monitor and keyboard will be more comfortable with at least 100cm by 55cm.

Those figures are a starting point. The shape of every staircase is different, so careful measuring matters more than any rule of thumb. Our range of modern computer desks UK sale includes compact and slim designs suited to these awkward spaces, and the steps below will help you find the right dimensions before you choose.

Why Under Stairs Spaces Are Tricky to Measure

An under stairs space is not a simple rectangle. The ceiling slopes, so the usable height changes along its length. The tall end, usually nearest the front door or the bottom step, may give you full standing height, while the far end drops to a few centimetres. On top of that, the void often contains a meter, a consumer unit, pipes or a radiator, and many under stairs areas open directly onto a hallway that people walk through all day.

The result is that the space looks larger than it is. Measuring only the floor footprint tends to lead to a desk that technically fits but leaves you sitting with your head against the stairs. The aim is to identify the comfortable working zone within the space. It also helps to look at the desk as part of a small working kit, alongside a compact chair and some storage, and our wider home office furniture UK collection groups these pieces together.

How to Measure Step by Step

1. Find the seated height line. Sit on a chair at the open end of the space and slide slowly towards the low end. Mark the point on the floor where the underside of the stairs is roughly 15cm to 20cm above the top of your head. That mark is the furthest your seated position can go.
2. Measure the desk width. Measure from the open side wall to a point a little beyond your mark. The desk surface can extend under the lower part of the slope, because only your head needs the height. Your legs and the desktop sit lower down.
3. Measure the depth. Measure from the back wall to the edge of the hallway or the line you want to keep clear. Then decide how much of that depth can be given to the desk.
4. Check the walkway. Hallways in many UK homes are narrow, so decide how much clear width you need to keep for people, pushchairs and shopping bags to pass the desk comfortably.
5. Note obstacles. Mark the positions of sockets, meters, switches, skirting boards and any radiators, as these affect both placement and access.

Write all of these figures down and sketch the space from the side. A simple drawing showing the slope and your seated mark makes it much easier to compare against desk dimensions.

Typical Sizes for Common Setups

Laptop only

A desk of 80cm to 90cm wide and 45cm to 50cm deep gives enough room for a laptop, a mouse and a notebook. This is often the most realistic option in a terraced house or a flat with a short staircase.

Laptop with external monitor

Allow 100cm to 110cm in width and around 55cm in depth. A monitor arm can free up surface space and lets you push the screen back against the wall.

Desktop computer and monitor

A full desktop setup is harder to fit. You will usually need 110cm to 120cm of width and 60cm of depth, plus space for the tower, which can sit on the floor at the low end of the slope where you would not sit anyway.

The Chair Matters as Much as the Desk

Chair clearance is the measurement most often overlooked. When seated, you need room behind the desk edge to push your chair back. In a hallway, that space is shared with anyone walking past, so a large office chair can easily become an obstacle.

A compact chair without wide armrests, or one that tucks fully under the desk when not in use, keeps the hallway clear. Swivel bases help in tight spaces because you can turn to stand up rather than rolling backwards. Our selection of home office chairs UK includes smaller designs that work well in compact workspaces.

Desk Styles That Tend to Work Under Stairs

Slim rectangular desks with simple legs are the most adaptable. They sit flush against the back wall and make it easy to see and clean underneath. Open frames feel lighter in a space that is already enclosed.

Desks with built in shelving or a hutch can be useful, but check the overall height against the slope. A shelf above the desk needs to sit below the underside of the stairs, which limits you to the taller end of the space.

Fitted or bespoke solutions follow the slope exactly, but a well chosen freestanding desk combined with shelves cut to the stair angle can achieve a similar result while remaining easy to move if you change the layout later.

Storage That Uses the Low End

The lowest part of an under stairs space is rarely useful for sitting, but it is valuable for storage. Low shelving, baskets or a small cabinet can sit in the area beneath the steepest part of the slope, keeping files, printer paper and equipment out of the way. Our modern shelving units and storage UK range includes compact pieces that fit tight spaces.

Vertical storage on the open side wall also helps. Wall shelves, hooks or a pegboard keep the desktop clear and make use of height where it is available.

Light, Power and Air

Under stairs spaces are usually dark, as they rarely have a window. A combination of a ceiling or wall light and a dedicated task lamp makes the area pleasant to work in. LED strip lighting fixed beneath the stair stringer can wash light down onto the desk without taking up space.

Power is often limited to a single socket, if any. An extension lead with surge protection can serve a laptop, monitor and lamp, but avoid running cables across the hallway floor. If you are planning a long term workspace, it may be worth having an electrician add a socket.

Ventilation is easy to forget. Computers generate heat, and a small enclosed space can become warm and stuffy. Leaving the space open rather than fitting doors, or using doors with a gap at the base, helps air move.

Keeping the Space Feeling Open

A desk tucked under the stairs can feel claustrophobic if the area is dark and cluttered. Lighter colours on the walls and the underside of the stairs reflect light and make the space feel larger. A light wood or white desk keeps the area visually calm. Leave some wall space empty rather than covering every surface with shelves.

It is also worth thinking about how the space looks from the hallway. A neat desk with a closed drawer or storage box for work items keeps the entrance of your home feeling welcoming. If you are unsure how much room your hallway really offers, our guide to average UK hallway sizes by property type is a helpful reference, and our article on hallway furniture depth and corridor clearance in UK homes explains how much clear width to keep for comfortable movement.

Living With an Under Stairs Office Day to Day

Once the desk is in place, a few habits make the space far easier to live with. Because the area is so close to the front door, it tends to attract keys, post, bags and shoes. Give those items their own home nearby, such as a hook rail or a small console, so the desk stays a desk rather than a drop zone.

Noise is another consideration. An under stairs workspace sits at the heart of the house, so footsteps on the stairs and the front door opening will be part of your working day. A pair of comfortable headphones helps for calls, and a soft rug under the chair reduces echo on hard floors.

Think about privacy on video calls too. The background behind you is likely to be the hallway, so a tidy view, a plant or a piece of artwork on the opposite wall gives a calmer impression. If several people in the household will use the desk, agree a simple rule about clearing the surface at the end of each session so the next person can start without moving someone else’s work.

Finding Your Size

The right desk for an under stairs space comes from the seated height line, the depth you can spare from the hallway and the room your chair needs to move. Measure in that order, sketch the slope and compare it against the desk dimensions before you choose. You can explore compact computer desks, chairs and storage at Furniture in Fashion.

Frequently Asked Questions

What is the smallest desk that works under the stairs?

A desk of around 80cm wide and 45cm deep is usually the smallest practical size for a laptop, a mouse and a notebook.

Can I fit a full desktop computer under the stairs?

Often yes, if you have at least 110cm of usable width and around 60cm of depth. The tower can sit at the low end of the slope where you would not sit anyway.

How much headroom do I need when seated?

Aim for at least 15cm to 20cm of space between the top of your head and the underside of the stairs when sitting at the desk.

Is it safe to work in an under stairs cupboard with a meter?

Keep meters and consumer units accessible and clear of furniture, and avoid covering them with shelving. If in doubt, ask a qualified electrician before setting up.