We get called to a lot of bathrooms and kitchens where the first question is simple: can this be regrouted, or does it need retiling? It matters because the wrong choice wastes money. Regrouting sound tiles can freshen a shower for a fraction of the cost, but regrouting loose tiles is just dressing up a failure that will come back.
In London flats, especially older Victorian and Edwardian conversions, tiled walls are often hiding uneven plaster, old adhesive, timber movement, and the odd repair from a previous leak. If water has already got behind the tiles, new grout will not make the wall sound again.
The sensible answer comes from checking the tile bed, the grout, the silicone, and any signs of water damage nearby. Below is how we judge regrouting vs retiling on site, and where a homeowner or landlord should stop and bring in a professional.
Why Failed Grout and Failed Tiles Are Different Problems
Grout is the hard material between tiles. Its job is to fill the joints, keep dirt out, and help shed water from the surface. It is not meant to hold the tiles to the wall, and it is not a proper waterproofing system by itself.
Tiles are held by adhesive onto plaster, tile backer board, cement board, or an existing tiled surface if it has been over-tiled. When the adhesive bond fails, the tile can sound hollow, move under pressure, or crack at the edges. Regrouting will not fix that because the problem is behind the face of the tile.
Bathrooms in Kensington and Chelsea properties often have extra quirks. We see shower walls built on old plasterboard, tiles laid over flexible timber floors, and period walls that are nowhere near flat. Small movement opens grout lines, water gets in, and the damage spreads quietly before anyone sees a stain on the ceiling below.
Inspect the Grout Lines First
Start by looking closely at the grout, not from the doorway but from a few inches away. If it is stained, powdery, cracked in hairline patches, or missing in short runs, regrouting may be enough if the tiles themselves are solid.
Use a blunt plastic scraper or an old toothbrush handle to test the surface. Grout that flakes out like chalk usually needs raking out and replacing, while grout that is only discoloured may clean up with a proper mould remover and ventilation fix.
As a rough London price guide, a small shower enclosure regrout often falls around £220 to £450 depending on access, grout depth, and whether old silicone needs cutting out. A larger bathroom floor may be closer to £300 to £650 if furniture and awkward edges slow the job down.
Test Each Tile for Movement
Tap the tiles gently with the plastic handle of a screwdriver or similar light tool. A solid tile gives a firm, dull sound, while a hollow tile often sounds sharper or drum-like. One hollow tile may be a local fault, but several hollow tiles together usually point to failed adhesive or movement in the background.
Press carefully on suspect tiles, especially around showers, baths, splashbacks, and floor edges. If a tile shifts, clicks, or flexes, regrouting is not the correct repair. The tile needs removing and the surface behind it needs checking before anything is reinstated.
On floors, pay attention to cracks running across grout and tiles in straight lines. That can mean movement in floorboards, poor boarding, or missing decoupling matting. Retiling without sorting the floor structure first usually leads to the same cracks coming back.
Check Behind the Silicone and Edges
Silicone at the bath, shower tray, worktop, and internal corners fails before many people notice. Black staining, gaps, lifting edges, or soft silicone can let water track behind tiles even when the grout still looks tidy.
Cutting out and replacing silicone is often a small job, typically around £90 to £180 for a straightforward bath or shower seal, but it only works if the joint is dry and stable. If the silicone is hiding blown plasterboard, swollen timber, or loose bottom-row tiles, the repair becomes bigger.
In rented properties, we always advise landlords not to ignore failed silicone. A small bead failure around a shower can become a leak claim, damaged ceiling, or mould complaint. Good maintenance is cheaper than a full strip-out after months of water ingress.
Look for Water Damage Outside the Tiled Area
Check the room below, the other side of the wall, skirting boards, boxing-in, and nearby cupboards. Brown staining, peeling paint, swollen MDF, a damp smell, or mould patches can all suggest water has travelled behind the tiled face.
If there is a stain on a ceiling below a shower or bath, do not assume the grout is the only issue. It might be a failed waste trap, leaking pipe, cracked shower tray, poor sealant, or water running through failed tile joints. At that point, a professional inspection is sensible because guessing can mean repairing the wrong thing.
Where plumbing is involved, we would usually isolate the cause before touching the tiles. Our plumbing services team can check traps, pipework, shower valves, and bath wastes so the tiling repair is not covering an active leak.
Choose Regrouting Only When the Tiles Are Sound
Regrouting is the right route when the tiles are well bonded, the background is dry, and the issue is mainly worn, cracked, or dirty grout. The old grout should be raked out to a proper depth rather than skimmed over. A thin smear of new grout over old grout rarely lasts.
For a shower, we normally remove loose grout, vacuum the joints, wipe down the surface, and allow it to dry before applying suitable grout. In wet areas, a mould-resistant flexible grout may be more appropriate than a basic powdered grout, especially where minor movement is expected.
After grouting, the joints need proper cleaning and curing time before the shower is used. Many grouts need at least 24 hours before light use, and some need longer depending on the product and room conditions. Rushing this stage is one reason new grout fails early.
Retile When the Surface Has Failed
Retiling is needed when tiles are loose, cracked because of movement, sitting on damp plasterboard, or fixed to a surface that is breaking down. It is also the better choice when the layout has many failed patch repairs and the finished surface will never look right with grout alone.
A proper retiling job normally means stripping the affected area, checking the substrate, replacing damaged boards, and using the correct adhesive and grout for the location. In showers, we often recommend tile backer board or tanking where appropriate, rather than tiling straight back onto old plasterboard in a wet zone.
Typical tiling labour in London can sit around £80 to £150 per square metre depending on tile size, pattern, preparation, and access. Tiles themselves may be £20 to £80 per square metre for common ranges, with specialist porcelain, marble, or handmade tiles costing more. A small bathroom wall repair might be £600 to £1,200, while a more involved shower or part-bathroom retile can easily run from £1,800 to £4,500 once boards, trims, adhesives, grout, and waste disposal are included.
Protect Electrics, Heating and Hidden Services Before Removing Tiles
Tile removal is noisy and can disturb more than the visible wall finish. Bathrooms and kitchens often have cables, shaver points, sockets, extractor fans, underfloor heating mats, and pipework close to the tiled surface.
Any electrical work in a bathroom or around special locations must be treated carefully under Part P of the Building Regulations, and installations should comply with BS 7671. If there is underfloor heating, damaged cable, a loose electric shower, or a socket affected by water, stop and get a qualified electrician to inspect it.
We also see older flats where pipework runs in strange routes behind boxed sections or tiled bath panels. If a tile will not come away cleanly or the wall sounds hollow around pipework, forced DIY removal can turn a tiling job into an emergency leak.
Plan the Timing, Mess and Access Properly
Regrouting is usually a one-day job for a modest shower or splashback, plus curing time before the area is used. Retiling takes longer because stripping, drying, boarding, adhesive curing, grouting, and silicone all need their own time. A shower may be out of use for several days if the backing needs replacing.
Think about access in London properties. Top-floor mansion blocks, basement flats, controlled parking, lift restrictions, and communal hallways all affect how materials and waste are handled. Good protection on floors and shared areas is not optional, especially in leasehold buildings with managing agents.
For DIY, keep it to small areas where the tiles are fixed firmly, there is no damp smell, and you are not working near electrics or active leaks. Call a professional if you find loose tiles, swollen boards, repeated mould, cracked grout returning after previous repairs, water stains below, or any sign that the problem is structural rather than cosmetic. Kensington Maintenance Services Ltd handles this kind of repair through our handyman services, tiling, plumbing, and finishing trades, so the cause and finish can be dealt with together.
Frequently Asked Questions
Q1: Can I regrout over old grout?
No, not properly. Old grout should be raked out to a suitable depth so the new grout has enough body to bond and last.
Q2: How do I know if my shower needs retiling rather than regrouting?
If tiles are loose, hollow, cracked, or the wall behind feels soft or damp, retiling is usually the safer option. Regrouting only works when the tile bed is sound.
Q3: How long should I avoid using the shower after regrouting?
Most showers should be left for at least 24 hours, but some products and room conditions need longer. Always follow the grout manufacturer’s curing instructions.
Q4: Is black grout mould a sign of a leak?
Not always. It can be poor ventilation and surface mould, but if it comes with gaps, loose silicone, damp smells, or staining nearby, the area should be checked for water ingress.
Q5: Is retiling worth it before selling or renting a property?
It can be, especially if the existing tiles look tired or show obvious failure. For rentals, sound waterproofing and safe finishes matter more than cosmetic patching.
The simple rule is this: regrout when the grout has failed but the tiles and background are solid, and retile when the surface behind the tiles has moved, softened, leaked, or broken down. If you are unsure, it is cheaper to have it checked before the wrong repair traps moisture or fails again, so get a quote from Kensington Maintenance Services Ltd or contact our team for a proper assessment, clear pricing, and contact us for professional services.