Grout is the unsung hero of the tiled bathroom — but it doesn’t last forever. Cracking, shrinking, staining, mould and discolouration all happen over time, particularly in wet rooms and around baths and shower trays. Here’s a practical guide to bathroom tile grout repair and regrouting, and how to know which option is right for your situation.
Signs That Your Grout Needs Attention
- Grout lines that have cracked or crumbled
- Grout that has shrunk back from the tile edges, creating a gap
- Persistent dark staining or black mould that won’t clean off
- Grout that has completely fallen out in sections
- Discolouration that doesn’t respond to cleaning products
- Water getting behind tiles — which may indicate failed grout at the junctions
Grout Repair vs Full Regrouting
Localised Grout Repair
If just a few grout lines have cracked or fallen out — typically around the bath surround, shower tray perimeter, or at tile junctions — targeted repair is the right approach. Old grout is raked out, the joint cleaned, and new grout applied and finished. The challenge is colour-matching: new grout often looks slightly different from aged surrounding grout until it’s cleaned and sealed.
Full Regrouting
Where grout is failing across the whole tiled area — or where staining is too widespread to resolve by cleaning — full regrouting involves removing all existing grout, cleaning the tile joints thoroughly, and applying fresh grout throughout. This is more disruptive and expensive than localised repair but gives a uniform, fresh result.
The Silicone Joint: Often Confused with Grout
The joint at the base of the bath, around the shower tray perimeter, and at the corners of a shower are typically silicone — not grout. These are movement joints that allow the bath or tray to flex without cracking the surrounding tiles. Failed silicone looks similar to failed grout but requires a different repair approach: the old silicone is stripped out and a fresh bead applied and tooled smooth.
Many bathroom problems attributed to grout are actually silicone joint failure — and resolving it is much faster and cheaper than a full regrout.
How Long Does Grout Last?
Well-applied, properly sealed grout in a domestic bathroom typically lasts ten to fifteen years before showing significant deterioration. In wet rooms and steam showers, deterioration is faster. Regular application of grout sealer (every one to two years) extends grout life significantly by reducing water penetration.
Get a Quote for Grout Repair
Send us photographs of the grout damage — including wide shots of the tiled area and close-ups of the failing grout — for a free, no-obligation estimate. We cover the whole of the UK.
