You can put together a home office for £300. Not a showroom one — no solid walnut riser desk, no chair with twelve levers and a headrest you will never adjust — but a setup you can sit at for a full working day without your shoulders creeping up towards your ears and your lower back filing a complaint.

The difference between a cheap office that works and one that quietly ruins your afternoons is rarely the budget. It is the order you spend it in. Most people buy the desk first, because it is the biggest and most visible thing, then discover they have £60 left for a chair. Do it the other way round.

Spend in order, not all at once

Work down this list and stop when the money runs out. If you have to use the kitchen table for a fortnight while you wait for the right chair to appear, that is a better outcome than buying everything in one Saturday and regretting half of it.

1. Chair — roughly £80–£120. The one thing you should not buy blind, and the one thing worth travelling for.
2. Desk — roughly £60–£100. Sturdy and dull beats stylish and wobbly every time.
3. Lighting — roughly £30–£50. Two light sources, not one. More on this below.
4. Storage and cables — roughly £25–£40. Somewhere for paper to live that is not your keyboard.
5. Whatever is left. Footrest, mouse mat, a monitor stand made of books. Expect one forgotten item; leave room for it.

Treat those figures as proportions rather than fixed targets. Prices swing wildly depending on where you live, what time of year it is, and whether a local office has just been stripped out. The second-hand market is your friend here: charity furniture shops, ex-office clearance sellers, university surplus sales, local auction houses, and the usual online marketplaces. Set up saved searches and be patient. Finding the right chair at the right price is a waiting game, not a shopping trip.

The chair is the one thing not to buy blind

A bad chair makes everything else irrelevant. You will not care about your lighting or your storage if your back aches by three o'clock. A second-hand proper office chair — the kind that was designed for eight-hour days — is almost always a better buy than a new budget chair at the same price.

What to check before you hand over money

• The gas lift. Push the chair down hard. If it sinks on its own, walk away.
• Seat depth. You want a couple of fingers' width between the back of your knees and the front edge of the seat.
• Adjustability. Seat height is non-negotiable. A backrest that moves up and down is a strong bonus.
• Armrests. Ideally removable, so you can tuck the chair under the desk. Fixed armrests that hit the desk edge are worse than none.
• The base and castors. Five legs, no cracks. Hard castors will scratch wooden floors — swap them for soft ones or add a cheap mat.

Sit in it for ten minutes, not ten seconds. Take a book. If you feel pressure behind the knees or a hard bar across your shoulder blades, that feeling does not improve with familiarity.

If you already have a back, neck or shoulder condition, get advice from a physiotherapist or your GP about what will suit you before you buy. General ergonomic advice is a starting point, not a diagnosis.

Desks: boring and solid wins

You do not need a desk. You need a flat, stable surface at roughly the right height. That opens up options a furniture shop will not show you:

• A second-hand dining table, which is often cheaper and far sturdier than a flat-pack desk.
• A kitchen worktop offcut cut to size and sat on two adjustable trestle legs. Ask a local kitchen fitter about offcuts; they are frequently disposed of.
• An ex-office desk from a clearance seller — usually ugly, almost always indestructible.

Two measurements matter. Height should let your elbows sit at about ninety degrees with your shoulders relaxed, not lifted. Depth should be at least 60cm, and 70–80cm is better if you want a monitor a sensible distance from your face. If you are much shorter or taller than average, an adjustable desk or adjustable legs plus a footrest will make far more difference than any other upgrade.

What to avoid: thin-topped flat-pack desks. They flex when you type, and flex is what makes a cheap setup feel cheap. Put your hands on it and press. If it moves, keep looking.

Lighting: you want two sources, not one

A single ceiling light is the worst possible setup. It puts you in your own shadow and leaves the wall behind your screen far brighter or far darker than the screen itself, which is tiring over a long day.

Buy a task lamp with an adjustable arm and place it to the side of your writing hand, so your hand does not shadow the keyboard or the page. If you are right-handed, that means the lamp goes on the left. Then add a second, softer light — a floor lamp, a small shelf lamp, or a cheap bias light behind the monitor — to lift the wall behind the screen.

Position the desk so daylight falls across it rather than onto your screen or into your eyes. Sitting with a bright window directly behind your monitor is the fastest way to give yourself a headache.

Storage and cable control on a shoestring

You do not need a filing cabinet. You need somewhere for the paper, cables and random objects that would otherwise colonise your desk surface.

A single drawer unit on castors that slides under the desk does most of the work. Add a wall shelf or a rail with a few pots above the desk if you have the space. For cables, a pack of velcro ties, a power strip mounted under the desk rather than trailing across the floor, and a roll of masking tape for labelling chargers will tidy a whole room for very little. Unplugging the right charger without checking the plug is a small daily irritation you can delete permanently.

The rule that keeps a budget desk usable: nothing lives on the surface that you do not touch at least once a week.

Finishing touches for the last thirty pounds

Once the chair, desk and light are sorted, spend what remains on the things you will notice every day. A footrest — or a sturdy box file — if your chair will not go low enough for your feet to rest flat. A stack of books under the monitor to bring the top of the screen level with, or slightly below, your eyes. A plain mouse mat rather than a gel wrist rest, which some people find presses uncomfortably on the wrist. If you ever get numbness or tingling in your hands, stop and speak to a health professional rather than buying more accessories.

A realistic weekend plan

Measure your space first, and note where the daylight comes from. Then start hunting for the chair, because that search takes longest. Buy it, take it home, and work from it for a few days before you spend another penny — you will learn more about what you need in three days of real use than in an hour of browsing.

Then buy the desk, set both to roughly the right heights, and only afterwards sort out lighting, storage and cables. Check return policies on anything new, and keep receipts for the first month. If money is tight, spread the purchases across two or three months rather than settling for a chair you will replace by spring. A £300 office built in the right order will comfortably outlast a £600 one assembled in a panic.