Tile Levelling Systems: The UK Guide to Clips, Wedges, and Lippage Control
UK guide to tile levelling systems: clip-and-wedge vs twist-cap, BS 5385-3 lippage tolerance, consumption per m², starter kits from budget to pro, back-buttering pairing.
Your large-format porcelain floor goes in on a Friday. The tiler leaves happy. You walk across the new surface on Saturday morning, barefoot, and catch your toe on a tile edge that's sitting 2mm proud of the tile next to it. Multiply that edge across a 24m² kitchen floor and you've got a trip hazard that no amount of grout will hide. The fix is ripping the floor up and starting again. A single pack of plastic clips and wedges, used properly, is the difference between a floor that looks handmade and a floor that looks like a shopfitter installed it.
What it is and what it's for
A tile levelling system is a two-part plastic jig that holds adjacent tile edges in the same horizontal plane while the adhesive cures. It solves lippage, which is the trade word for the height difference between two neighbouring tiles where one sits higher than the other. On small tiles the eye doesn't catch it. On 600mm porcelain, anything above a hair's breadth is instantly visible and instantly a trip hazard.
The system works with two components. A flat plastic T-clip (also called a base or spacer) slides horizontally between two tiles while they're still being bedded into adhesive. The clip sits under the tile edges with a thin vertical slot poking up above the tile surface. A tapered plastic wedge is then driven through that slot with a pair of locking pliers. As the wedge drives in, it forces downward against both tile surfaces, pulling the clip upward from below and squeezing both tile edges into the same plane. Adhesive cures with the tiles held flat to each other. After cure, you whack the exposed clip with a rubber mallet, it snaps off at a designed break-point just below the tile surface, and the buried stub gets hidden under grout.
Wedges are reusable. You pull them out after each cure cycle, wipe them clean, and they go back in the box. Clips are single-use consumables.
The British Standard that governs acceptable lippage on UK tile installations is BS 5385-3:2024 (the code of practice for floor tiling, updated in May 2024). It sets the maximum tolerance: 1mm of lippage on grout joints less than 6mm wide, 2mm on joints of 6mm or wider (BS 5385-3:2024). That standard isn't automatically a legal requirement on a domestic job, but it becomes the benchmark the moment a dispute goes anywhere near a contract or a court. A levelling system, used properly, keeps you well under that tolerance on any tile up to about 1200x1200mm.
Types, sizes, and specifications
Three system families exist in the UK market. Only two of them belong on a floor.
Clip-and-wedge (the default for floors)
The system described above. A T-shaped plastic clip plus a tapered wedge, driven by hand-operated locking pliers. This is what every professional UK tiler uses on large-format porcelain floors. It's fast, the wedges are reusable, and the clip snaps cleanly at the designed break-point.
UK brands you'll see on merchants' shelves: Raimondi RLS (Italian, the original patent-holder), Peygran Optima (Spanish, popular budget-to-mid), Rubi Delta (Spanish, widely stocked), Perfect Level Master (PLM, British), Pro-Level (budget own-brand through Tile Mountain), Genesis (CTD Trade own-brand), Tuscan SeamClip (American), and No Nonsense (Screwfix own-brand, the cheapest starter kit on the market). Wedges are largely cross-compatible between clip brands, which is why pros keep a single pliers and mix bulk clip packs from whichever retailer is cheapest that week.
Twist-cap (walls only)
A threaded plastic strip slides between the tiles, and a screw cap or spinner is twisted down onto the tile surface by hand. No pliers required. The cap applies downward tension as you screw it, holding the tiles in plane. After cure you spin the cap back off, snap the strip, move on.
On walls this is fine, because you work a section at a time and remove the caps the same day before the adhesive fully sets. On floors it fails, hard. You simply cannot get round a 20m² floor fast enough to remove every cap before the adhesive kicks. Leave a cap in too long and it's locked; the only way out is to destroy it. UK tilers are unanimous on this: one experienced tiler on the UK Tiling Forum put it bluntly: "I've tried the twist ones and they were awful, no idea how you are meant to take them out of floors before the adhesive sets."
UK brands: Rubi Tile Level Quick (the Cyclone system), Twister.
Do not use a twist-cap levelling system on a floor. Clip-and-wedge is the only sensible choice for floor tiles. Twist-cap is acceptable on walls where you remove the caps within hours, same day, before the adhesive fully sets.
Screw-type
A threaded screw mechanism on the clip, driven by a manual or powered screwdriver. Rare on standard domestic jobs. Used mainly on very thick or heavy tiles (12-20mm porcelain slabs, natural stone). Raimondi RLS VITE is the main UK example. You're unlikely to need this on a kitchen floor.
Clip sizes: joint width and tile thickness
Two dimensions matter when you buy clips.
The joint width is the space the clip creates between two tiles. Standard widths on UK clips are 1mm, 1.5mm, 2mm, and 3mm. Match this to the grout joint you want, or better, go one size smaller (see the buying advice below).
The tile thickness range the clip is designed for. Most standard clips cover tiles 3-12mm thick, which is everything from a thin wall tile up to a standard porcelain floor tile. For 12-20mm porcelain slabs (kitchen extension slabs or outdoor paving) you need oversize clips designed for that thickness.
| System type | Where it works | Speed | Best for | Avoid for |
|---|---|---|---|---|
| Clip-and-wedge | Floors and walls | Fast on large areas | All large-format floors, porcelain, any job over 5m² | Nothing, this is the default |
| Twist-cap | Walls only | Slow per tile | Vertical work where you remove caps same day | Any floor, any large area |
| Screw-type | Thick tile slabs | Slow | 12-20mm porcelain slabs, heavy natural stone | Standard 6-10mm tiles, everyday floor work |
How to work with it
The system is simple to use and easy to misuse. Most of the skill is in knowing when to stop driving the wedge.
Step by step
Spread adhesive on the substrate with a notched trowel. For any tile 600mm or larger, back-butter the tile too (skim a thin layer of adhesive on the tile back with the flat edge of the trowel). Place the first tile into the adhesive bed and bed it down firmly with a twisting motion to collapse the combed ridges.
Slide a clip horizontally under the edge of the tile where the next tile will meet it. The flat part of the T goes under the tile; the vertical slot stays above the surface. On a 600mm tile edge, place two clips roughly 50-100mm from each corner. For edges longer than 600mm, add a third clip mid-edge. Don't place clips right at corners, the tile can chip when you snap them off.
Lay the next tile, butting its edge against the clip bases. The clips now sit between the two tiles, acting as both spacers (keeping the grout joint uniform) and levellers (pulling the tile edges into plane).
Take your pliers and drive the wedge into the clip slot. The pliers have one jaw that pushes the wedge and another that pushes against the tile surface. Squeeze progressively, checking with your fingertips across the joint. Stop the moment both tile surfaces feel flush. You're squeezing tile edges into plane, not crushing the tile into the adhesive.
Repeat for every joint as you lay. Keep your grout lines clear of adhesive squeeze-out as you go. A dab of adhesive oozing up into the joint around the clip base is the single most common reason clips fail to snap cleanly at removal.
Leave the clips in place for the full adhesive cure window. Standard cement adhesive at 20°C typically needs 24 hours before clips can come out. Rapid-set adhesive might allow clip removal much sooner. Always check the adhesive manufacturer's data sheet; the clip is not the clock, the adhesive is.
After cure, strike each exposed clip stem with a rubber mallet, aiming parallel to the grout joint (not perpendicular, not at an angle). The clip breaks at the designed notch below tile level. Sweep up the fragments, pull out the wedges, wipe them, and put them aside for reuse. Grout can go in straight after.
Pairing with back-buttering
This is the pairing that separates a professional installation from a DIY one. Back-buttering means applying a thin skim of adhesive to the back of the tile, not just to the substrate. On a 600mm or larger porcelain tile, combing the substrate alone gives you significantly less than the full coverage required under BS 5385-3:2024 for floors. Back-buttering lifts that to near-100%. BS 5385-1:2018 effectively demands full-coverage bedding on tiles over 0.1m² (anything over 316mm square) and on all wet-area floors.
Why this matters when you're using a levelling system: driving a wedge into a clip squeezes the tile downward. If there's a hollow beneath the tile because the adhesive bed was thin or combed-only, you can actually lift the opposite edge of the tile out of the adhesive as the wedge tightens. You end up with tiles perfectly flush to each other at the joint and a drum-hollow tile that rings when you tap it. The hollow cracks the first time something heavy gets dropped on it.
Back-butter every tile 600mm or larger. Comb the substrate with the right notch trowel. Use the levelling system. All three together.
When you're buying clips, buy them one size smaller than your actual grout joint width. A 1.5mm clip in a 2mm joint removes cleanly without chipping tile edges. A 2mm clip in a 2mm joint jams tight, and when you mallet it off the plastic takes a crumb of porcelain with it. Use separate 2mm tile spacers alongside the undersized clips to set your actual joint width. This is a UK trade tiler's trick that retailer guides don't mention. Note that BS 5385-1:2018 specifies a minimum 3 mm joint for 600×600mm tiles: 2mm is common trade practice but sits below the standard.
Tools and handling
You need three tools: a pack of clips, a pack of wedges, and a pair of tile-levelling pliers. That's it. Budget pliers sit at the low end of the pricing range; pros pay more for Raimondi or Rubi ergonomic versions if they're using them all week. For removal, a white rubber mallet (the soft kind that won't mark the tile surface) is the right tool. Standard builder's rubber mallet will also work.
Weather doesn't affect the clips themselves, but adhesive cure time does. Cold substrates slow the cure and stretch your removal window. Hot, dry rooms shorten it. Plan removal around the adhesive, not the calendar.
How much do you need
Consumption depends on tile size. The rule of thumb for the common sizes:
For 600x600mm tiles, allow roughly 6 clips per tile, which works out to approximately 17 clips per m² (2.78 tiles per m² × 6 clips per tile = 16.68). Add a 10-15% buffer for breakage and awkward cuts, and order 18-20 clips per m².
For 600x1200mm and 900x900mm tiles, allow 8 clips per tile, giving roughly 12-13 clips per m². Add the same buffer.
For 1200x1200mm tiles, allow 10-12 clips per tile (the long edges need more intermediate support to control tile bow, which is a real problem at this size). You're looking at roughly 8-9 clips per m² with buffer.
A worked example for a 24m² kitchen floor using 600x600mm porcelain tiles:
- 24m² × 17 clips per m² = 408 clips
- Add 15% buffer for breakage and offcuts = 470 clips
- Round up to the nearest bulk pack size = 500 clips
That's one 500-clip bulk pack. On the same floor you'll need around 50-80 wedges total (they're reusable and rotate round the job as you lay and remove). A 100-pack of wedges is plenty, and you'll have the spare stock for the next job.
Clips only go on joints between tiles. You don't place clips along walls or where tiles meet a finished edge trim. So perimeter tiles use fewer clips than centre tiles, and the 17 per m² figure is an average that already accounts for this.
Cost and where to buy
UK pricing splits cleanly between budget own-brand kits, established brand kits, and bulk consumable packs for pros. All prices below captured from UK retailer listings April 2026; check current prices before buying.
Starter kits
| Kit | System | Contents | Joint width | Price inc VAT | Retailer |
|---|---|---|---|---|---|
| No Nonsense Tile Levelling System Kit | Clip-and-wedge | 100 clips + 100 wedges + pliers | 2mm | £13.99 | Screwfix |
| Raimondi RLS Starter Kit | Clip-and-wedge | 250 clips + 250 wedges + pliers | 1.5mm | £35.00 | Ceramic Tiling Tools |
| Peygran Large Kit 400-piece | Clip-and-wedge | Pliers + 200 clips + 200 wedges | 1-3mm options | ~£45 (Amazon UK) | Pro Tiler Tools, Amazon UK |
| Rubi Tile Level Quick Kit | Twist-cap (walls only) | 100 strips + 100 caps + pliers | Various | £44.99 | Pro Tiler Tools |
The No Nonsense kit is by some distance the cheapest starter option. It's Screwfix's own-brand, 2mm joint width, tile thickness 4-10mm. For a one-off domestic job on standard porcelain it's perfectly adequate. The clip plastic is softer than the name-brand equivalents, so you'll see a few more failed snaps, but the price absorbs the waste.
The Raimondi RLS starter kit is the industry default. Better plastic, tighter tolerance on the snap break-point, and the pliers are considerably better than the Screwfix set. If you're tiling more than one floor, this is the one to buy.
The Rubi Tile Level Quick kit is a twist-cap system. As noted, not for floors.
Bulk packs for larger jobs
Once you're past a single bathroom floor, buying a starter kit and topping up with bulk consumables works out much cheaper per clip. Typical per-unit economics from UK specialist retailers in April 2026 land between 6p and 10p per clip in bulk packs, with wedges sold in 100-packs and 200-packs separately.
| Product | Pack size | Price inc VAT | Per unit | Retailer |
|---|---|---|---|---|
| Rubi 2mm clips | 400-pack | £25.03 | ~6p per clip | Tile Mountain |
| Pro-Level 2mm clips | 500-pack | £39.99 | ~8p per clip | Tile Mountain |
| Raimondi 1mm clips | 500-pack | £40.73 | ~8p per clip | Ceramic Tiling Tools |
| Peygran 3mm clips | 300-pack | £28.99 | ~10p per clip | Tile Emporium via Pro Tiler Tools |
| Rubi wedges | 200-pack | £17.01 | ~9p per wedge | Tile Mountain |
| Raimondi wedges | 100-pack | £13.60 | ~14p per wedge | Ceramic Tiling Tools |
For the 24m² kitchen floor example needing 500 clips, total consumable spend lands in the range of a typical restaurant meal for two. It's a small fraction of what you'll spend on tile adhesive and the tiles themselves for the same floor, and it's cheap insurance against a failed installation.
Where to buy
Screwfix and Toolstation stock their own-brand starter kits plus Mapei and some Ardex. Wickes carries own-brand and limited range. For the full Raimondi, Rubi, Peygran, and PLM ranges, specialist online retailers are better: Pro Tiler Tools, Tile Mountain, Tile Fix Direct, Ceramic Tiling Tools, European Heritage. Topps Tiles and CTD Trade will order any brand but the shelf selection is thinner. Amazon UK stocks most brands but prices swing wildly, so check against specialist retailers before buying.
Alternatives
There isn't a direct substitute for a tile levelling system on large-format floors. The alternatives are either doing without or compensating with better technique elsewhere.
A skilled tiler with 20+ years of experience on a flat SR1-tolerance substrate can achieve sub-1mm lippage on 600x600mm tiles without clips, using nothing but a long spirit level, the palm of one hand, and a pair of tile nippers for fine adjustment. Most UK community debate on this topic circles back to the same point: the 40-year pros don't need clips, but they also won't let you watch them work. For anyone else, including competent DIY tilers, the system is cheap insurance against the one mistake that ruins a floor.
Better substrate preparation reduces the work the levelling system has to do. A perfectly flat anhydrite liquid screed laid to SR1 tolerance (3mm under a 2m straightedge per BS 8204) gives the system a fair starting point. A wavy sand-cement screed forces the clips to fight against the substrate, and you can lose tiles to hollows even with the clips in place.
Smaller tiles remove the need entirely. 300x300mm ceramic floor tiles on a flat screed don't need a levelling system. The tile body itself has enough flex and the eye doesn't catch sub-1mm lippage on small tiles. This isn't really an alternative to the system, it's a reminder that the system solves a problem only large-format tiles create.
Decoupling membranes (Schluter DITRA and equivalents) help with substrate movement but don't help with lippage. They're a different tool solving a different problem.
Better substrate preparation can also mean applying a self-levelling compound over a wavy screed before tiling. Fix the substrate first, then tile.
Where you'll need this
- Tiling, used on every large-format porcelain floor installation, especially over underfloor heating where rigid alignment matters most
- Flooring, used when laying 600mm+ porcelain floor tiles or wood-effect plank tiles in offset-bond patterns
Tile levelling systems appear across any extension or renovation project where large-format floor tiles are specified. The bigger the tile, the more essential the system.
Common mistakes
Using the system to rescue a bad substrate. The clip only controls tile-to-tile height at each joint. It does not flatten the floor. A 10mm dip across 1m of screed will produce a tiled floor with perfect joints and a 10mm dip in it. Fix the substrate first with a self-levelling compound, then tile.
Over-driving the wedge. Squeezing the pliers until they won't close any further doesn't make the tiles flatter, it pulls them out of the adhesive bed. You get tiles perfectly flush at the joint and a hollow void beneath. The tile rings when you tap it, cracks the first time something heavy lands on it. Drive the wedge until the tile surfaces feel flush, then stop. Your fingertips across the joint are the gauge.
Leaving clips in too long. Leave clips in past the adhesive manufacturer's removal window and the adhesive over-cures around the buried clip base. When you come to mallet the clip off, it won't break at the designed notch, it'll stay locked in the adhesive and snap somewhere unpredictable or simply refuse to move. Either use a rapid-set adhesive (allowing clip removal inside the manufacturer's stated window) or plan removal inside the adhesive manufacturer's stated window for standard cement adhesive.
Adhesive squeeze-out into grout lines. As you press each tile down and drive the wedge, a small bead of adhesive will ooze up into the grout joint around the clip base. If you let that set, it cements the clip in place and prevents the clean snap. Wipe every grout line clear with a finger or a wet sponge as you go. This is the single most reported clip failure mode on UK tiling forums.
Wrong clip width for the joint. Buying 3mm clips for a 2mm grout joint jams the clip tight between the tiles. When you mallet the clip off, the plastic can't flex away cleanly and takes a crumb of porcelain edge with it. Buy clips one size smaller than your grout joint and use tile spacers alongside to set the actual joint width.
Twist-cap systems on floors. As covered above, cap-based systems don't give you time to remove caps on a floor before the adhesive sets. You end up with caps embedded in the floor and a destructive removal job. Clip-and-wedge only for floors.
Too few clips on long edges. A single clip per edge on a 900mm tile lets the middle of the tile sit proud. Two clips per 600mm edge, three per 900mm or longer edge, placed 50-100mm from each corner with the third at mid-edge.
Never grout until every clip has been removed. Grout sets hard against the exposed clip stem, locks it in place, and you have no way to get it out without chipping the surrounding tiles. After adhesive cures, mallet every clip off, sweep up the fragments, and only then mix grout.
Expecting the system to make the floor level. The system makes adjacent tiles coplanar with each other. It does not make the overall floor level. If the adhesive bed gets thicker as you work across the room, the whole area of tiles will be coplanar with each other but the floor itself will slope. Check overall level with a 2m spirit level every few square metres as you lay. The clips hold the tiles together. You hold the floor level.