A modular desk is the right answer when the room keeps changing its mind
Summary: A modular desk is useful when a room changes jobs over time. The parts need real reusable connectors, practical depth and height options, and layouts that can move from straight to L-shaped without buying a new desk.
The first time I put together a modular desk, I did it wrong twice and then a third time. The room was a 2.6 by 3.1 m bedroom corner that had been a bedroom corner, then a covid-era office, then half-bedroom half-office, then a baby's nap zone for about four months, and then back to office once the baby got promoted to her own room. Every six to eight months the furniture had to move. A fixed desk would've meant buying and selling a desk three times. A modular one meant unscrewing four bolts and putting the same panels back in a different shape.
That's really what modular desk furniture is for. Not for showing off in a magazine. For rooms that won't stay one thing.
What modular actually means here
The word gets thrown around. People sell a desk with a single drawer attached and call it modular. It isn't.
A useful definition: a modular desk is one where the worktop, leg system, drawer units, and any add-ons (return wing, monitor shelf, side cabinet) can be unbolted and reattached in a different layout without buying new parts. The minimum you should expect is two top configurations (straight or L-shaped) and at least two leg positions per top. Anything less and you've bought a sectional desk, not a modular one.
The give-away is the connector hardware. Real modular desks use cam locks, M6 bolts, or threaded inserts that can be undone and redone twenty times without chewing the wood. A particleboard desk that uses Confirmat screws straight into MDF will hold for one rebuild, maybe two, then the holes go soft and you're filling with toothpicks and glue. Ask, before you buy, what the connector type is. If the answer is "wood screws", it isn't modular. It's a desk that came in a box.
The shapes that actually work
Most home offices end up needing one of four layouts, and a good modular system covers all four with the same panels.
Straight, against a wall. 1.4 to 1.8 m of top, depth around 70 cm, two legs or a trestle. The default for anyone who works on one screen.
L-shaped, in a corner. A 1.4 m main top with a 90 cm to 1.2 m return at 90 degrees. The return is where the printer, the second monitor, or the notepad lives. You need at least 60 cm of depth on the return for it to be useful for anything but a lamp.
Parallel, against opposing walls. Two tops, one for the computer, one for the messy stuff (paper, soldering, sewing machine, sourdough starter, pick your hobby). Workable in rooms 2.4 m wide and up. Below that, the chair can't pivot.
Standing-and-sitting, side by side. A standing top of about 1 m width and an adjacent sitting top of 1.2 m. Lets you switch posture without rearranging the keyboard. This one's underrated. Most people who get a standing desk and a sitting desk in the same room end up using whichever one isn't covered in stuff, and that varies daily.
A modular system worth the name lets you go from any of these to any other with the panels you already own. You buy maybe one extra leg or one extra cross-brace in year two.
Heights, depths, and the bit nobody publishes
Standard desk height is 74 to 76 cm. Almost everyone uses one. Almost nobody should.
If you're under 1.7 m, you want about 68 to 71 cm at the top of the desk, with your elbows at 90 degrees when your hands are on the keyboard. If you're over 1.85 m, you want 77 to 80 cm. Most modular legs come in two heights: the catalogue 74 and a "tall" 76. That's it. If you want anything outside that, the legs need to be cuttable (steel ones aren't, usually) or come with a height-adjust mechanism.
Adjustable-height legs add roughly 200 to 350 euros per pair to a modular desk. They're worth it if you share the desk, or if you ever sit and stand at the same workstation. Not worth it if you're the only user and your height is stable, which, statistically, after about age 30, it is, until it isn't.
Depth: 70 cm is the modern minimum if you have any monitor over 24 inches. 60 cm is what you get by default. The gap matters. A 27 inch monitor on a 60 cm desk sits about 35 cm from your face, which is too close to read all day. The same monitor on a 70 cm desk sits at 45 cm, which is right. The difference is 10 cm of plywood and your eyes for the next decade.
Apron clearance, which is the gap between the underside of the top and your knees, should be at least 24 cm and ideally 27 cm. Most modular systems hide a cross-brace under the top right where your knees go. Check the drawing before you buy. The cross-brace is fine on a corner desk where the legs are diagonal from where you sit. On a straight desk it's a knee-bruiser.
Costs, in plain numbers
Rough numbers from desks I've actually bought or quoted in the last two years. EU prices, for context.
A pre-cut modular desk in 25 mm oak-veneered ply with a steel frame, sized to a specific room and configurable into two layouts, runs around 450 to 800 euros for a 1.6 m by 70 cm main top with a 90 cm return wing. Add 80 to 150 for a small drawer pedestal that hangs on the underside.
A name-brand modular system (the ones with their own catalogue and an online configurator that can't quite handle your wall) runs 1,400 to 2,800 for the same footprint. The wood is fine. The price is most of the brand and the showroom that you don't visit.
A carpenter-built equivalent in solid oak is 2,200 to 4,500 euros, with a four to ten week lead time, and the modularity is whatever the carpenter says it is. Usually that means "I left the cross-brace bolted not glued, so good luck".
The pre-cut middle option is where the maths works for most people.
What I'd ask before ordering
Connector type. Cam locks or threaded inserts, not wood screws into MDF.
Depth options. 700 minimum if you have any monitor bigger than 24 inches.
Height options. If you share the desk or want to stand sometimes, get adjustable. Otherwise pick the right fixed height for you, not the catalogue default.
Reconfigurability promise. Specifically: can the same parts go from straight to L-shaped without buying new ones? Get this in writing.
Cable management. A modular desk that doesn't think about cables ends up with a power strip on the floor and a permanent rat's nest. Look for a cable tray as a stock add-on, not an afterthought.
If your office corner is going to keep changing shape, a modular desk built to your room's actual numbers is the kind of problem knuslabs.com was built to solve.
If you're planning the same kind of project, start with custom TV unit concepts or compare it with modular conference table concepts. For adjacent planning detail, read Modular rattan garden furniture, and the gap that nobody fills and Modular bathroom furniture is just storage that fits around plumbing.