Stud walls look easy, a frame of timber, plasterboard on both sides, done. But anyone who’s ever had to hang a radiator or align plasterboard joints knows the devil’s in the spacing.
Whether you opt for 400 mm or 600 mm centres, the choice can make the difference between a solid wall and one that flexes, cracks, or simply doesn’t line up.
For UK builders, joiners, and dryliners, getting stud spacing right isn’t just about habit. It affects board fit, acoustic performance, strength, and even compliance.
This guide gets into the reasoning behind common stud layouts, noggin placement, and fixing techniques, from a trade perspective.
Quick answer: In the UK, stud walls are built at 400 mm or 600 mm centres, measured from the centre of one stud to the centre of the next (not the gap between them). 600 mm is fine for a standard partition lined with 12.5 mm or 15 mm plasterboard. Go down to 400 mm if the wall will be tiled over 12.5 mm board, if you are using thinner board, or if you want a stiffer wall for heavy fixings. Both spacings line up with the edges of a standard 1,200 mm wide board.
What A Stud Wall Actually Is?
A stud wall is basically a skeleton made from timber or metal sections that forms the framework for internal walls.
In the UK, timber companies use CLS (Canadian Lumber Standard) timber in sizes like 38×63 mm or 38×89 mm, depending on height and load.
Metal stud walls use C-studs and U-tracks, often seen in commercial fit-outs or lightweight partitions.
Both types are the same principle, vertical studs fixed between a head plate at the top and a sole plate at the bottom, with noggins running horizontally to stiffen the frame.
Not all stud walls are load-bearing. Many are just partitioning, separating rooms or services. But even non-structural walls must withstand the stresses of fixtures, doors, and thermal or acoustic lining.
Standard Stud Spacing In The UK
When someone says “400 mm centres,” they mean the distance from the centre of one stud to the centre of the next, not edge to edge.
That matters because plasterboard sheets (usually 1,200 mm wide) are designed to fit neatly with standard spacing.
In the UK, most walls are framed at either 400 mm or 600 mm centres, occasionally 450 mm for certain board layouts or curved walls.
Those figures aren’t arbitrary; they come from building standards and plasterboard manufacturer recommendations like British Gypsum and Knauf.
At 600 mm centres, a standard 1,200 mm board will fit across three studs, centre, joint, and edge. At 400 mm centres, the board edges will fall on every third stud, giving tighter support and less board deflection.
Accuracy matters here. A few mm out at each stud can throw the whole wall out, and you’ll be fighting gaps when it’s time to board up. Good tradespeople always double-check the spacing from the centre line, not just “by eye”.
400 mm Vs 600 mm Centres: The Trade Off
Here’s where experience comes in. Both spacings have their place, but behave differently on site.
400 mm Centres give a stiffer wall. The studs are closer together, so plasterboard flexes less, perfect for tiled areas, bathrooms, or walls with fixtures like cupboards or sinks.
The tighter spacing also limits movement over time, so you’re less likely to see cracking along joints.
The downside is obvious: more studs means more timber, more time cutting and fixing, and slightly higher material costs. But in areas where rigidity matters, that’s money well spent.
600 mm Centres are lighter and faster to build. You’re saving on timber, screws, and labour, perfect for non-load-bearing partitions or rooms that don’t need reinforcement, like bedrooms or offices.
600 mm spacing with 12.5 mm plasterboard gives decent stiffness for most domestic walls. But on tall partitions or where fixtures are planned, flex can become an issue, especially with thinner boards.
If you’re unsure which to go for, base it on finish and use. Tiled walls, heavy fittings, or high traffic areas?
Go with 400 mm. Lightweight partitions or dry areas? 600 mm is fine, but never at the expense of board support.
Quick reference: which stud centres to use
| Situation | Stud centres | Notes |
|---|---|---|
| Standard partition, 12.5 mm or 15 mm plasterboard, painted finish | 600 mm | British Gypsum timber stud partitions use 600 mm maximum centres |
| Tiled wall, 12.5 mm plasterboard on timber studs | 400 mm | British Gypsum White Book tiling guidance |
| Tiled wall, 15 mm plasterboard on timber studs | 600 mm | Same guidance; check the weight of tile plus adhesive bed |
| Both sides tiled, or not sure which side will be tiled | 400 mm | Work to the stricter spacing |
| Heavy items (wall-hung basin, radiator, TV bracket, kitchen units) | 400 or 600 mm plus noggins | Fix into timber, not into the board alone |
Screws go in at a maximum of 300 mm centres along each stud, and no closer than 13 mm to a cut edge or 10 mm to a bound (paper-covered) edge. Set your drill clutch so the heads sit just below the surface without tearing the paper.
Noggins And Their Placement Rules
Noggins are the heroes of every stud wall. These short horizontal blocks between studs stop twisting, add strength, and support plasterboard edges. Without them, a tall wall can feel hollow or unstable.
There’s no one rule for spacing noggins, but a good rule of thumb is to fit them about halfway up the wall, about 1.2m from the floor on a standard 2.4m high wall.
For taller partitions, two rows may be needed. Many plasterboard manufacturers recommend that horizontal joints between boards align directly over noggins to prevent cracking.
When fixing them, staggering their position between studs makes screwing easier and stops the frame from bowing.
For walls with fixtures like basins, radiators, or shelving, additional noggins should be planned behind those zones before boarding.
Metal stud systems achieve the same effect using punch-out cross braces or horizontal channels rather than timber blocks, keeping the frame light while still resisting twist.
How many noggins does a stud wall need?
For a typical 2.4 m wall boarded with full-height sheets, one row of noggins at around mid-height (roughly 1.2 m) is the usual minimum to stop studs twisting. Add a noggin wherever two boards meet horizontally, because every board edge needs timber behind it to screw into, and add extra noggins or blocking at the height of anything heavy you plan to hang. Noggins are normally cut from the same timber as the studs, so with 38 mm studs a noggin is about 362 mm long at 400 mm centres and about 562 mm long at 600 mm centres.
Fixings, Bracing & Best Practice
A stud wall’s strength isn’t only about the timber layout, it’s also about how it’s fixed together and lined.
For timber, screws or nails can be used, but most trades favour screws for precision and less vibration. Use drywall or wood screws long enough to bite securely into the studs. With metal studs, self-drilling Tek screws are the go-to choice.
Plasterboards can be installed horizontally or vertically, depending on the height and layout. Horizontal boarding is common in domestic settings because it reduces visible joint lines and uses full board widths efficiently.
Fix screws roughly every 200–250 mm along edges and 300 mm within the field. Keep at least 10–15 mm away from board edges to prevent breakout.
Acoustic and insulation layers also play a part. Denser boards and mineral wool infill work better with tighter stud spacing.
Wider centres (600 mm) can slightly reduce sound insulation performance, as there’s more open space for vibration.
For bathroom or kitchen partitions, a moisture-resistant board (often green-faced) should be combined with a vapour barrier, especially on external walls. The tighter 400 mm spacing helps keep these boards firm under tile loads.
And always check for straightness before boarding. Even a slight bow in a stud will show once plastered, especially across longer runs.
Stud Spacing And Plasterboard Compatibility
Most UK plasterboard is 1,200 mm wide, so spacing your studs correctly ensures the edges land cleanly on a stud.
At 600 mm centres, you’ll get a board joint every second stud, while 400 mm centres give a joint every third one.
That extra contact helps avoid cracking and edge movement. Misaligned centres, even by 10–15 mm, can lead to awkward gaps or boards hanging unsupported at edges, which later translate into cracked joints or weak fixings.
A quick calculation makes the difference clear. A 2.4 m wall at 600 mm centres needs five studs. The same wall at 400 mm centres takes seven.
Two extra studs might not sound much, but it’s what keeps walls feeling solid, especially once fixtures go on.
The takeaway: stud spacing should follow the board, not the other way around. Always check manufacturer data sheets, they specify maximum spacing for each board type and thickness.
Common Mistakes And How To Avoid Them
A few classic errors come up time and again on site. The first is guessing stud centres without marking them out accurately.
That usually ends with plasterboard joints floating between studs, a guaranteed crack point later.
Another is forgetting noggins behind load zones. Once the wall’s boarded and skimmed, it’s too late to reinforce for a basin or wall unit. Always plan the service and fixing layout before closing the wall.
Using undersized timber is another culprit. A 38×63 mm stud might seem fine for a quick partition, but on anything over 2.4 m high or carrying heavy finishes, it’ll flex. Upgrading to 38×89 mm gives noticeably better rigidity.
And finally, rushing boarding or over-screwing edges weakens plasterboard. Let the screws pull the board tight, don’t bury them. It’s small details like these that separate a decent wall from one that squeaks or cracks six months later.
When To Use Metal Stud Systems
Metal studwork has become standard in commercial fit-outs and multi-unit housing for good reason.
It’s light, perfectly straight, and faster to install than timber. Standard metal stud walls are built at 600 mm centres, though tighter spacing can be used for double-layer boards or acoustic-rated systems.
They’re not ideal for carrying heavy loads unless reinforced with timber inserts or specialised fixings.
But for drylining, office partitions, or large residential projects, metal studs save time and weight. Installation uses self-tapping screws rather than nails or wood screws, keeping everything neat and uniform.
The only real limitation? Metal studs transmit sound more readily and can feel less “solid” under impact, something to consider in domestic settings where tactile strength matters.
Stud wall spacing FAQs
Should a stud wall be 400 or 600 centres?
Use 600 mm for an ordinary partition lined with 12.5 mm or 15 mm plasterboard. Use 400 mm if the wall will be tiled over 12.5 mm board, if both sides will be tiled, or if you want a stiffer wall that takes fixings more easily.
How far apart are studs in the UK?
Usually 400 mm or 600 mm centres. Both divide evenly into a 1,200 mm plasterboard sheet, so every board edge lands on a stud.
What does 400 mm centres mean?
It means the distance from the centre of one stud to the centre of the next is 400 mm. With 38 mm wide studs, the clear gap between them is about 362 mm.
How far apart should noggins be in a stud wall?
There is no single fixed distance. Fit a row at about mid-height on a standard 2.4 m wall, a row wherever boards join horizontally, and extra rows where heavy items will be fixed. Taller walls usually need two or more rows.
What size timber should I use for a stud wall?
38 x 63 mm CLS suits most lightweight internal partitions. Step up to 38 x 89 mm CLS for taller walls, deeper insulation or more room for pipes and cables. Use the same section for the noggins.
Do internal stud walls need sound insulation?
In a new home, Approved Document E expects internal walls between a bedroom or a room with a WC and other rooms to achieve at least 40 dB (Rw). Walls with a door in them and en-suite walls to the bedroom they serve are excluded. Acoustic roll in the cavity is the simplest way to get there.
Can I tile straight onto a stud wall?
Yes, onto unskimmed plasterboard or a tile backer board, as long as the studs are at the right centres for the board you have used. Do not skim plasterboard that you plan to tile, and in showers or wet rooms tank the wall before tiling.
Final Thoughts
Stud spacing might seem like a small detail, but it sets the foundation for how every other part of a wall performs.
Whether you’re framing a quick partition or lining out a tiled bathroom, consistency, precision, and proper bracing make all the difference.
For tradespeople who want to refine their technique without wasting materials or risking site mistakes, Tradefox offers realistic simulations of tasks like stud layout, fixing patterns, and sequencing, a smart way to sharpen your workflow off-site.
In the end, the right spacing isn’t about theory, it’s about purpose. 400 mm for strength, 600 mm for efficiency. A few extra studs today often save a lot of call-backs tomorrow.
