Luxury Vinyl Tile (LVT): The Complete UK Guide for Extensions and Kitchens

The flooring choice looks like the easy decision on an extension. It isn't. Pick click LVT for a south-facing kitchen with bifolds and you'll watch the seams tent and lift during the first properly warm summer. Pick the wrong wear layer and the floor around the sink will look tired within five years. LVT is the right material for most kitchen extensions, but the category hides four genuinely different products behind one acronym, and only one is correct for a sunny room with underfloor heating.

What it is and what it's for

Luxury vinyl tile, usually shortened to LVT, is a multi-layer synthetic floor covering. The layers stack from bottom to top as a backing, a core, a printed decor film, and a transparent wear layer. The decor film is what you see (wood grain, stone, concrete, geometric patterns), and the wear layer is what protects it. Change the core material and you change everything else about how the floor behaves: how it installs, how it copes with heat, whether it can go under kitchen units, and how long it lasts.

LVT is warm underfoot, genuinely water-resistant (not the "water-resistant for 12 hours" laminate claim), compatible with underfloor heating, and thin enough to allow step-free transitions between rooms. It's the dominant flooring choice for UK kitchen extensions because it handles everything kitchens throw at it: splashes, chair legs, heavy appliances being dragged in and out, and the thermal cycling from UFH.

The UK standard for installation is BS 8203 (code of practice for installation of resilient floor coverings). It sets the substrate flatness requirement at SR1 (no more than 3mm deviation over a 2-metre straightedge), caps substrate moisture at 75% relative humidity, and is the reference document your installer will cite if anything goes wrong. BS 8203 compliance is also what most manufacturer warranties hang off, so the standard isn't optional even though building control doesn't inspect it directly.

One more thing before the buying decision. "LVT" has become a marketing term rather than a product specification. A product with a 0.2mm wear layer on a foamed WPC core at budget pricing is technically vinyl tile flooring. A 0.7mm-wear-layer Amtico Form glue-down plank at premium pricing is also technically LVT. They will behave nothing like each other in a kitchen. Understanding the format and wear layer matters more than brand.

The four formats: click, glue-down, rigid core SPC, and looselay

Every LVT product sold in the UK is one of four formats. This is the single most important decision on the whole specification, and getting it wrong is how extensions end up with floors that need replacing within two years.

Glue-down LVT

Glue-down, also called dryback LVT, is adhered directly to a prepared substrate using specialist LVT adhesive. The planks are thinner (2-3.5mm) than any other format, which means step-free transitions to adjacent rooms work in most cases without a ramp or threshold strip. The floor does not float, does not need a perimeter expansion gap in the conventional sense, and can run continuously under kitchen base units. For a south-facing kitchen extension with large glazing, glue-down is the correct format. No other format handles the thermal conditions reliably.

Self-levelling compound (SLC) over a feathered screed is almost always needed on a new kitchen extension floor, because even liquid screed finished to SR1 on pour day drifts fractionally during curing. Substrate preparation is where glue-down is unforgiving. SR1 (3mm over 2m) is mandatory. The adhesive itself matters too, and for south-facing rooms a high-temperature formulation is non-negotiable. The three products UK installers name by brand are F Ball Styccobond F48 PLUS, Mapei UltraBond Eco 4 LVT, and Bostik Stix A550 Power Elastic. A standard pressure-sensitive adhesive can soften under direct sunlight, letting the LVT shrink back from its bonded position and create visible gaps at the seams.

Thermal resistance of glue-down LVT is around 0.012 m²K/W, the lowest of any LVT format. This is about a twelfth of the typical UFH manufacturer limit of 0.15 m²K/W for optimal system performance, and well under the 0.25 m²K/W absolute ceiling. Underfloor heating works brilliantly beneath glue-down LVT.

Click-lock (floating) LVT

Click LVT uses a tongue-and-groove profile on each edge that snaps into the next plank. No adhesive is involved. The floor floats over the substrate, relying on a perimeter expansion gap (typically 10mm) to accommodate seasonal movement.

That movement is exactly why click LVT fails in south-facing kitchens. The floor surface temperature in a room with large glazing can reach 40-60°C on a sunny afternoon, which is enough to cause visible expansion in floating vinyl. Planks push against each other at the seams and tent upwards. The perimeter gap compresses and the floor lifts at the base of skirting. And here's the failure mode nobody warns homeowners about: if click LVT runs under kitchen base units, the units pin the floor and prevent the expansion movement. The floor then tears at the seams during the seasonal contraction that follows, splitting the click joints apart.

Click LVT is the cheapest format to install because it's DIY-accessible. It's also the format marketed hardest at budget end of the market, which is why homeowners end up with it in rooms where it shouldn't be. In a north-facing hallway with no UFH and no built-in furniture on top, click LVT works fine. In a south-facing kitchen extension with bifolds, it's the wrong choice.

Rigid core SPC

SPC (stone polymer composite) is a subtype of click LVT with a dense core made from roughly 70% limestone powder bound by polymer. The core's density gives SPC significantly better dimensional stability than flexible click LVT or WPC (wood polymer composite, its softer cousin). Some manufacturers quote SPC as suitable for temperature swings from 5°C to 45°C.

That makes SPC a viable compromise for rooms with moderate sun exposure, provided two conditions are met: the wear layer is 0.5mm or better (avoid entry-level 0.3mm SPC like Wickes Novocore for kitchens), and solar control glass or blinds are specified on any south-facing glazing to cap the peak floor temperature. The floor still cannot run under kitchen base units. It's still a floating floor that needs freedom to expand.

Thermal resistance of rigid core SPC runs 0.034-0.074 m²K/W depending on the backing, still well under the 0.15 m²K/W UFH threshold. Most SPC products have a 1-2mm foam layer pre-attached to the backing. Adding additional underlay on top of this voids the warranty and pushes the combined thermal resistance towards the UFH limit, so don't do it.

Looselay

Looselay LVT is the least common format in UK kitchens. The planks or tiles are heavy (5-6mm thick flexible PVC) with a friction-grip or glass-fibre backing that holds them to the substrate under their own weight. No adhesive, no click system. Karndean's LooseLay range is the best-known UK product.

The installation speed is the main selling point. A looselay floor can be laid in a morning and pulled up for access to pipework or UFH manifolds below without damaging anything. That makes it useful for rental properties or rooms where floor access matters more than permanence. In a south-facing kitchen extension it's the wrong choice. Without adhesive the floor can still shift or bulge under thermal stress, and without a click system it can't rely on joint integrity either.

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Wear layer: the number that decides lifespan

The wear layer is the clear, scratch-resistant top coat that protects the decor film beneath. It's measured in millimetres in the UK (Europeans use the same) and in mils in North America (1 mil = 0.0254mm, often quoted on American product sheets imported to the UK). The thicker the wear layer, the longer the floor looks good.

The industry consensus for kitchens is 0.55mm minimum. Below that, scratches from chair legs, denting from dropped utensils, and general dulling around the sink and hob show up within five to seven years of active cooking. Above 0.55mm the floor outlasts most kitchen refits. Wickes Novocore at 0.3mm is fine for a utility room or spare bedroom but underspecified for a main kitchen extension, no matter how good the deal looks on the shelf.

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Underfloor heating, thermal resistance, and the Future Homes Standard

LVT is one of the two best floor coverings for underfloor heating alongside porcelain tile. The thermal resistance values cover the whole category comfortably:

• Glue-down LVT (2-3.5mm): 0.012 m²K/W
• Rigid core SPC click (5-8mm): 0.034-0.074 m²K/W
• Add 2-3mm foam underlay on top: another 0.05-0.10 m²K/W

The Future Homes Standard and most UFH manufacturer specifications set a ceiling of 0.15 m²K/W for the floor covering to achieve optimal heat transfer. Some manufacturers allow up to 0.25 m²K/W as an absolute maximum. Glue-down LVT sails under both numbers. Rigid core SPC with its pre-attached backing is still inside the 0.15 limit provided you don't add a second foam underlay on top, which is exactly what some homeowners do to "improve the feel underfoot" without realising they've just cut their UFH output by a third.

BS specifies a maximum surface temperature of 27°C for resilient floor coverings. Your UFH flow temperature should be set to achieve a floor surface of 18-21°C for everyday occupied use, well below the 27°C ceiling. That ceiling applies to all LVT formats without exception.

One sequencing detail that catches people out: glue-down LVT should not be laid while the UFH is running. Switch the heating off 48 hours before laying day, let the floor cool to ambient temperature, lay the floor, and keep the heating off for 48 hours after. Then ramp the temperature back up gradually over several days rather than in one step.

Substrate preparation and the anhydrite screed problem

Adhesive failure and surface imperfections telegraphing through the floor are the two biggest causes of LVT problems, and both come back to the substrate. LVT is thin. There is no compressible layer to absorb irregularities the way carpet forgives them. A bump from a screw head or a 2mm dip in the screed is visible underfoot within days of laying and impossible to fix without lifting the affected area.

SR1 flatness

BS 8203 requires SR1: no more than 3mm deviation under a 2-metre straightedge, and no abrupt level changes exceeding 1mm. Check with a 2m aluminium straightedge and a set of feeler gauges. Any deviation over 3mm needs self-levelling compound. New cement screeds usually need a feathered SLC application even when poured to SR1, because drying shrinkage pulls the surface out of true during the first month of curing.

Moisture testing

Substrate relative humidity must not exceed 75% RH measured by an in-situ hygrometer sleeve (sensor embedded in the screed for at least 72 hours). Surface moisture meters are not accepted by manufacturer warranty suppliers, only the hygrometer method. Compare this 75% ceiling against the 65% RH limit for engineered wood and wood block flooring: LVT is a lot more tolerant of residual moisture, which is part of why it's the dominant choice for new extensions where the screed may only have been down for six to eight weeks.

Anhydrite screeds typically dry at 1mm/day at 20°C in still air. A 65mm liquid screed pour needs roughly 65 days to hit 75% RH, longer if the weather's cold or the extension isn't heated.

The anhydrite screed laitance problem

Anhydrite (calcium sulphate) screeds develop a surface layer of fine dust called laitance during curing. This layer is not bondable. Any adhesive or self-levelling compound applied directly on top of laitance will fail within weeks of the floor being put to use.

The fix is mechanical grinding. Your flooring contractor should bring a planetary floor grinder, take the laitance off the surface, vacuum up the dust, and then prime the ground screed before applying SLC or adhesive. This step is routinely skipped by general builders unfamiliar with anhydrite screeds, and it's one of the most expensive mistakes on a kitchen extension. If the grinding hasn't been specified in your builder's quote and your screed is anhydrite, raise it before the flooring is ordered. Grinding adds a line item to the programme and modest per-m² cost, factor it into your quote comparisons. Not grinding adds the full cost of lifting and re-laying the floor.

Primer and SLC

Porous concrete and screed substrates need priming before glue-down LVT. The primer seals the surface, prevents adhesive from being rapidly absorbed into the pores, and extends the adhesive's working time. Common primers include Ardex P51, F Ball Styccobond F78, and the proprietary primers supplied by Karndean and Amtico with their adhesive systems.

Self-levelling compound is feathered across the primed substrate to achieve SR1 flatness. Fibre-reinforced SLC from Ardex, Mapei, or Weber is the trade-standard product. Apply as per manufacturer instructions, give it 24-48 hours to cure before LVT laying, and check the flatness again before proceeding.

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Installation sequence: floor or kitchen first?

This is the question every installer and every forum thread disagrees on, and the answer depends entirely on which LVT format you've chosen.

Click LVT: kitchen first, then flooring cut around it. Always. The floor needs freedom to expand, and pinning it under base units destroys that. Fit the kitchen, install the appliances, then bring the flooring contractor in to cut the LVT around units, plinths, and integrated appliances.

Glue-down LVT: floor first is the better sequence. The floor runs continuously under base units. Future kitchen refits don't need the floor lifted or cut. The continuous surface looks cleaner, and there are no visible cut edges under kickboards. The catch is that the floor has to be protected during kitchen fitting. Heavy felt pads, hardboard protection sheets, or 3mm polythene dust sheets taped down must cover the LVT while units are being installed, because a base cabinet dropped from waist height onto a freshly laid Amtico Spacia plank will dent it permanently.

Rigid core SPC: kitchen first, like click. Same logic. It's still a floating floor.

Looselay: either works. Looselay is thick enough to tolerate impact during kitchen fitting, and the friction backing means you can lift an affected plank and replace it if needed.

There's a harder edge case: extensions with open-plan kitchen-diner layouts where the LVT runs into a living area without units. For a glue-down floor the sequence doesn't matter so much. For a click floor, the kitchen-first rule still applies, and the perimeter gap at the edge of the base units is important. Your installer should be running the gap right up to the kickboard line, not to the wall behind the units.

Acclimatisation and layout rules

LVT planks must acclimatise in the installation room for 48-72 hours at 18-24°C before laying. Cold planks laid in a warming room will expand beyond the planned perimeter gap. Hot planks laid in a cool room will shrink back and create visible gaps at the seams. Stack the boxes flat in the middle of the room where the temperature is uniform.

For click formats, a 10mm expansion gap around the perimeter is the baseline requirement. Some manufacturers specify 5-10mm depending on room size. Use perimeter spacers during laying, then remove them before the skirting goes back on. For glue-down, the gap is smaller (2-3mm) and is filled with colour-matched silicone (matched to the floor, not the wall, so the silicone moves with the floor during any thermal drift).

For click LVT, wait 24-48 hours after laying before applying perimeter silicone. The floor needs time to settle and complete any acclimatisation expansion. Seal too soon and the silicone forms a rigid boundary that the floor then fights against.

Cost and where to buy

LVT pricing splits into three clear tiers, but the wear layer and format drive the cost more than the brand name.

The baseline LVT supply cost across UK retailers sits at £15 – £60 per m² for most mid-range products. Glue-down LVT labour sits somewhat above click-LVT labour because of substrate prep, and rapid self-levelling prep adds another line item before the first tile goes down. Herringbone, chevron, borders, and intricate cuts around island units and dog-leg walls push labour well above straightforward rectangular layouts. Substrate preparation (primer, SLC, grinding for anhydrite) is not usually quoted separately on a supply-and-fit invoice, which is why the headline price can look low until the final bill arrives.

Fully installed including prep, a 50m² kitchen extension runs £2,500-4,500 for a mid-range glue-down specification. The same floor in Amtico Signature with professional prep: a premium LVT spec installed across a full kitchen extension can push well into four figures. Sitting at the installed total: £50 – £75 per m² is the range to budget against for mid-range products.

Where to buy

Karndean and Amtico are sold through authorised retailers rather than direct, and neither publishes per-m² prices openly. You have to request a quote, which most homeowners find frustrating. The trade route is more efficient: any kitchen fitter or tiling contractor with an Amtico account can quote supply-and-fit in a single number, and the margin between that and direct retail is usually small.

Karndean Van Gogh and Art Select are most widely stocked through Storiesflooring, Grosvenor Flooring, and specialist flooring showrooms. Amtico Spacia, Form, and Signature are sold through Amtico Design Partners (a network of approved retailers who also handle fitting). Wickes, Travis Perkins, and Screwfix carry mid-range own-brand and Quickstep Livyn for the budget-to-mid segment. Moduleo is widely available through Flooring Hut, Best4Flooring, and specialist online merchants.

For bulk orders on a large extension, builders' merchant accounts typically save 10-15% over retail pricing. But the specialist flooring retailers often have better technical advice on format selection, adhesive specification, and substrate prep, which on a south-facing extension is worth more than the discount.

Warranties: what they cover and the sunlight loophole

Headline LVT warranties look reassuring on the brochure. Amtico Signature carries a lifetime residential warranty (capped at 35 years, transferable). Amtico Form is 30 years, Spacia 25 years, Click Smart 20 years, First 15 years. Karndean Van Gogh, Art Select, and Opus carry a transferable lifetime residential warranty. Quickstep Livyn is typically 20-25 years.

The catch is in the conditions. Every major warranty requires installation by a competent fitter following manufacturer guidelines, properly prepared subfloor, appropriate adhesive (for glue-down collections), UFH surface temperature not exceeding 27°C, and adherence to "operating conditions the manufacturer specifies." That last phrase is where the sunlight gap lives.

No brand's warranty document explicitly lists "direct sunlight" as a headline void condition. The exclusion comes through the maintenance guidance (which advises protection from prolonged sunlight with drapes or blinds) combined with the warranty's requirement to follow that guidance. A click LVT floor that buckles in a sunny extension faces a high practical risk of warranty rejection on grounds of "failure to follow care guidelines." The theoretical coverage exists; the practical coverage is ambiguous.

The cleanest defence is specification. Glue-down format with a high-temperature adhesive is designed for the conditions in a south-facing room with glazing. If that floor later fails, the claim is far harder to contest.

LVT vs engineered wood, porcelain, and the alternatives

LVT is the dominant kitchen extension flooring for good reasons, but it isn't the only choice. The decision against each main alternative comes down to specific trade-offs.

Engineered wood flooring (engineered-wood-flooring) is natural timber rather than printed vinyl. In the right light it looks markedly better than even premium LVT, the surface can be sanded and refinished two to four times over a 30-40 year life, and it ages in a way LVT can't imitate. The cost is UFH compatibility (thermal resistance is higher, roughly 0.06-0.12 m²K/W for engineered oak), moisture tolerance (65% RH limit vs 75% for LVT), and cost. Engineered oak supply runs £40-80/m2, similar to mid-to-premium LVT, but installed cost including UFH-compatible underlay can exceed premium LVT.

Porcelain floor tiles (porcelain-floor-tiles) are harder, more heat-conductive, and essentially indestructible. UFH responds faster through porcelain than any LVT. The downsides are cold underfoot when the heating is off, unforgiving to dropped crockery, noisy underfoot without a softer finish, and installation cost is higher, installed mid-range porcelain costs several times more per square metre than an equivalent LVT job.

Laminate is the budget alternative, but the water resistance gap is what kills it. Laminate swells and delaminates from standing moisture; LVT doesn't. In a kitchen, laminate is the wrong choice regardless of price.

Glue-down LVT with a 0.55mm or 0.7mm wear layer hits the sweet spot for most kitchen extensions: warm, water-resistant, UFH-compatible, and priced between laminate and porcelain. The fact that it can run under kitchen base units and isn't vulnerable to south-facing sun exposure is what tips the decision against click LVT on anything but a very tight budget.

For edge cases where two different flooring materials meet (LVT transitioning into a tiled utility room, or LVT meeting carpet at a living room boundary), a transition-strip handles the joint. Glue-down LVT can often transition flush to adjacent floors because of its thin profile; click LVT usually needs a small threshold because of its thickness.

Common mistakes

Click LVT in a south-facing kitchen extension. The most expensive single mistake on this topic. Thermal expansion exceeds the perimeter gap, planks buckle at the seams, and if the floor runs under kitchen units it tears apart during winter contraction. The fix is relaying the whole floor in glue-down format, at full cost.

Cheap "LVT" that's really WPC with a 0.2mm wear layer. Many budget online products label themselves LVT but use a foamed wood-polymer composite core with a thin wear layer. In a kitchen they scratch and dull within two to three years. Always check the wear layer figure on the product data sheet before buying. Buying sub-0.55mm wear-layer LVT for a kitchen, see the Wear Layer section.

Skipping anhydrite screed laitance grinding. A flooring contractor who says "the screed looks fine, we'll just prime it" does not understand anhydrite. The laitance looks fine to the eye. The adhesive bond fails regardless. Grinding is non-negotiable.

Not testing substrate moisture. The construction industry's 28-day rule for concrete drying is unrelated to the 75% RH test. A slab can feel dry to the touch at 20 days and still read 85% RH. Lay LVT over that and adhesive failure, lifting, and cupping follow within months. Budget for hygrometer testing before adhesive ordering.

Not acclimatising planks before laying. Laying without acclimatisation in the room for 48-72 hours (see Acclimatisation).

Running click LVT under kitchen base units. Covered above, still the most common field failure. If the floor is click, the kitchen goes in first. Without exception.

Adding foam underlay over SPC with pre-attached backing. Doubles thermal resistance, voids the warranty, and the extra compressibility stresses the click joints. The factory backing is the underlay. Don't add another.

Confusing SPC with WPC. WPC (wood polymer composite) is warmer and quieter underfoot but a lot more vulnerable to dents from furniture legs and thermal expansion under sunlight. For a kitchen where appliances and furniture sit directly on the floor, SPC (stone polymer composite) is the correct rigid-core choice. Check the data sheet. If the core is described as foamed, layered, or wood-based, it's WPC.

Laying heavy furniture on pressure-sensitive adhesive before it has fully cured (see Laying section, wait 24-48 hours).

Where you'll need this

• Flooring - LVT is the dominant kitchen extension flooring choice, specified during second-fix after screed has fully cured and UFH has been commissioned
• Second-fix plumbing - glue-down LVT is laid before kitchen base units and appliance installation; click LVT is laid after

These installation sequences apply across any extension or renovation project, not just kitchens. The same LVT format rules govern flooring choice in loft conversions with south-facing roof lights, garden rooms with full-height glazing, and any open-plan space where direct sunlight on the floor can reach summer peaks of 40°C or more.