Question 1

What is the difference between ceramic and porcelain tiles?

Accepted Answer

Both are made from clay fired in a kiln, but porcelain is fired at higher temperatures (1200-1400°C vs 900-1100°C) using finer clay. This produces a denser, harder, less porous tile. Porcelain has a water absorption rate below 0.5%, making it frost-proof and suitable for outdoor use. Ceramic tiles absorb more water (3-10%) and are not frost-proof. Porcelain is generally more durable and suitable for floor and wall applications, while ceramic is lighter, easier to cut, and more affordable for wall-only use. For bathroom and kitchen floors, porcelain is the superior choice.

Question 2

What size tiles should I use in a small bathroom?

Accepted Answer

Contrary to common belief, larger tiles can make small bathrooms feel bigger by creating fewer grout lines and a more continuous surface. Tiles of 30x60cm or 60x60cm are popular for small bathroom walls and floors. Alternatively, small mosaic tiles (2.5x2.5cm or 5x5cm) create visual texture and interest. Avoid medium tiles (20x20cm) in small spaces as they can make the room feel cluttered. Light-coloured tiles in any size reflect more light and enhance the sense of space. Using the same tile on both walls and floor creates seamless continuity.

Question 3

How do I choose grout colour?

Accepted Answer

Matching grout to the tile colour creates a seamless, continuous surface that makes rooms feel larger — this is the most popular contemporary approach. Contrasting grout (e.g. dark grout with light tiles) highlights the tile pattern and creates a graphic, geometric effect. Mid-tone grey grout is a versatile choice that works with most tile colours and is more practical than white (which shows dirt). For wet areas, use an epoxy or cement-polymer grout with anti-mould additives. For natural stone, use grout specifically formulated for stone to prevent staining.

Question 4

Do I need to seal natural stone tiles?

Accepted Answer

Yes. Most natural stone tiles (marble, limestone, travertine, sandstone) are porous and must be sealed before grouting and periodically thereafter to prevent staining and water damage. Apply an impregnating sealer that penetrates the stone without changing its appearance. Reapply annually in high-use areas (kitchen floors, bathroom walls) and every 2-3 years in lower-use areas. Granite and slate are less porous and may only need minimal sealing. Always follow the stone supplier's specific sealing recommendations.

Question 5

Can I tile over existing tiles?

Accepted Answer

Yes, in many cases. The existing tiles must be firmly bonded to the wall or floor, clean, and free of damage. Lightly sand the surface to create a key for the adhesive, and use a flexible, high-bond adhesive designed for tile-over-tile application. This approach avoids the dust, time, and cost of removing existing tiles. However, it raises the floor level by approximately 10-15mm (affecting door clearance) and adds weight to the wall. For wet areas, ensure waterproofing is still intact. If the existing tiles are hollow-sounding, loose, or on a weak substrate, they should be removed rather than tiled over.

Question 6

How much does it cost to tile a bathroom in the UK?

Accepted Answer

For a standard family bathroom (approximately 8-12m² of wall and floor area), tiles cost £300-£600 at the budget level, £600-£1,500 mid-range, or £1,500-£3,000+ for premium tiles. Professional tiling labour adds £300-£700 for a standard bathroom, depending on complexity and tile format. Total tile-only cost (supply and fit) for a bathroom: £600-£1,200 budget, £1,200-£2,500 mid-range, or £2,500-£5,000+ premium. Large-format tiles and complex patterns (herringbone, chevron) cost more to install due to the greater precision required. Preparation work (tanking, levelling) may add £200-£500. Get quotes from verified tile suppliers and tilers on HouseJester.

Question 7

What are the best tiles for a kitchen floor?

Accepted Answer

Porcelain tiles are the best all-round choice for kitchen floors. They are extremely durable (PEI rating 4 or 5), water-resistant (absorption rate under 0.5%), stain-resistant, and available in finishes that replicate wood, stone, concrete, and terrazzo. Choose a matt or textured finish with an anti-slip rating of R10 or R11 for safety — polished porcelain can be slippery when wet. Large-format porcelain (60x60cm or 60x120cm) creates a clean, modern look with minimal grout lines. Natural stone (limestone, slate) is also excellent for kitchen floors but requires sealing. Avoid unglazed ceramic tiles on kitchen floors as they stain more easily.

Question 8

What does the PEI rating on tiles mean?

Accepted Answer

PEI (Porcelain Enamel Institute) rating indicates a tile's resistance to surface wear and abrasion, rated 0-5. PEI 0: wall tiles only, unsuitable for foot traffic. PEI 1: light foot traffic (en-suite bathrooms). PEI 2: moderate traffic (residential bathrooms, bedrooms). PEI 3: medium traffic (all residential areas including kitchens). PEI 4: high traffic (hallways, kitchens, conservatories). PEI 5: very heavy traffic (commercial applications). For residential floor tiles, PEI 3 is the minimum recommendation, with PEI 4 preferred for kitchens and hallways. Wall tiles do not need a PEI rating. Always check the PEI rating before using a tile in a floor application.

Question 9

How do I calculate how many tiles I need?

Accepted Answer

Measure the length and width of each surface to be tiled in metres. Multiply to get the area in square metres. Add a waste allowance: 5-10% for standard brick-bond or grid patterns, 10-15% for diagonal, herringbone, or chevron patterns. Divide the total area by the coverage per box (stated on the packaging) to determine the number of boxes needed, rounding up. For wall tiles, subtract the area of windows and doors but do not subtract for small obstacles (pipes, sockets) as cuts around these create waste. Always buy from the same batch to ensure colour consistency. Order slightly more than calculated — tiles from different batches may have slight colour variations if replacements are needed later.

Question 10

What is the best adhesive for wall and floor tiles?

Accepted Answer

For walls: a standard cement-based adhesive (powdered, mixed with water) is suitable for most ceramic wall tiles in dry areas. For wet areas (showers, behind baths), use a flexible rapid-set adhesive rated for wet area use. For large-format wall tiles (larger than 30x60cm), use a gel adhesive or rapid-set adhesive that prevents tiles from slipping before the adhesive cures. For floors: a flexible floor adhesive accommodates slight subfloor movement without cracking. For underfloor heating: a flexible adhesive rated for use with underfloor heating systems (S1 or S2 classification). For tile-over-tile: a high-bond flexible adhesive. Always use the adhesive recommended by the tile manufacturer.

Question 11

Should I use large or small format tiles?

Accepted Answer

Large-format tiles (60x60cm and above, up to 120x260cm slabs) create a seamless, contemporary look with minimal grout lines, making rooms feel larger and more open. They suit modern interiors and are excellent for bathrooms, kitchens, and open-plan spaces. However, they require a perfectly level substrate, are heavier to handle, and cost more to install. Small-format tiles (5x5cm to 20x20cm) add texture, pattern, and character — particularly effective for feature walls, splashbacks, and shower niches. Medium tiles (30x60cm) are the most versatile and popular format, suitable for virtually any application. Metro tiles (7.5x15cm or 10x20cm) remain hugely popular for kitchen and bathroom walls.

Question 12

How do I prevent tiles from cracking?

Accepted Answer

Tiles crack due to substrate movement, not tile failure. Ensure the substrate (wall or floor) is solid, stable, and properly prepared. On timber floors, use a tile backer board (cement-based board screwed to the joists) to create a rigid, stable surface. Use flexible adhesive (S1 or S2 classification) which absorbs minor movement without transferring stress to the tile. Include movement joints (filled with silicone, not grout) at changes of plane (where walls meet floors), around the room perimeter, and at intervals of 6-8 metres on large floor areas. Never tile onto fresh plaster or concrete without allowing adequate drying time (4 weeks minimum for plaster, 6 weeks for concrete screed). Underfloor heating should be commissioned and run through a full heat cycle before tiling.

Question 13

What is the difference between polished, matt, and textured tile finishes?

Accepted Answer

Polished (lapped) finishes have a high shine that reflects light, creating a bright, luxurious look. They show the tile's colour and veining most vividly but can be slippery when wet — not recommended for bathroom or kitchen floors. Matt finishes have no shine, are anti-slip, and hide marks and dirt better than polished surfaces — the most practical choice for floors. Textured (structured) finishes replicate the surface feel of natural materials (wood grain, stone texture) and provide excellent grip — ideal for wet areas and outdoor use. Satin finishes fall between matt and polished, offering a subtle sheen with better slip resistance than polished tiles.

Question 14

How do I clean and maintain tiled surfaces?

Accepted Answer

For glazed ceramic and porcelain: sweep or vacuum regularly to remove grit, then mop with warm water and a pH-neutral tile cleaner. Avoid acidic cleaners (vinegar, lemon) on natural stone and cementitious grout. For natural stone: use only stone-specific cleaners; acidic or alkaline products can etch the surface. Seal natural stone annually. For grout: apply grout sealant after installation to prevent staining. Clean discoloured grout with a grout-specific cleaner and a stiff brush. Epoxy grout is virtually maintenance-free and stain-proof. For textured tiles: use a stiff brush or steam cleaner to clean dirt from textured surfaces. Avoid leaving standing water on any tiled floor — it can penetrate grout joints over time.

Question 15

Can tiles be used outdoors in the UK?

Accepted Answer

Yes, but only frost-proof tiles with a water absorption rate below 0.5% (porcelain, some dense natural stones). Standard ceramic tiles will crack when water absorbed into the body freezes and expands. For outdoor floors, choose tiles with an anti-slip rating of R11 or R12 and a textured or structured finish for safety in wet conditions. 20mm-thick outdoor porcelain pavers are designed specifically for garden use — they can be laid on pedestals, sand, or adhesive. Natural stone (granite, sandstone, slate) is also suitable but requires sealing. Ensure outdoor tiling has adequate drainage gradient (1:80 minimum fall) to prevent standing water and ice formation.

Tile Type	Budget	Mid-range	Premium
Ceramic wall tiles	£10 – £25/m²	£25 – £50/m²	£50 – £100+/m²
Porcelain floor tiles	£20 – £40/m²	£40 – £80/m²	£80 – £150+/m²
Natural stone	£40 – £80/m²	£80 – £150/m²	£150 – £300+/m²
Mosaic tiles	£30 – £60/m²	£60 – £120/m²	£120 – £300+/m²
Encaustic/cement tiles	£40 – £70/m²	£70 – £120/m²	£120 – £250+/m²

Tile Type	Budget	Mid-range	Premium
Ceramic wall tiles	£10 – £25/m²	£25 – £50/m²	£50 – £100+/m²
Porcelain floor tiles	£20 – £40/m²	£40 – £80/m²	£80 – £150+/m²
Natural stone	£40 – £80/m²	£80 – £150/m²	£150 – £300+/m²
Mosaic tiles	£30 – £60/m²	£60 – £120/m²	£120 – £300+/m²
Encaustic/cement tiles	£40 – £70/m²	£70 – £120/m²	£120 – £250+/m²

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