Tile and window repair

Whether you are dealing with a "blown" double-glazing unit or a cracked bathroom floor tile, professional repairs restore the aesthetic and protective seal of your home. This guide covers everything you need to know about the process, costs, and regulations for tile and window maintenance.

What Does the Work Involve?

• Assessment: Inspecting the damage to determine if a simple repair is possible or if a full replacement of the tile or glass unit is required.
• Site Preparation: Protecting surrounding surfaces and, for windows, ensuring the area is safe from falling glass or debris.
• Tile Removal: Carefully raking out old grout and using specialized tools to remove broken tiles without damaging the underlying substrate.
• Glazing Removal: Removing beads or putty to extract failed or cracked glass units and cleaning the frame rebate.
• Installation: Bedding new tiles with appropriate adhesive or fitting new vacuum-sealed double-glazing units.
• Finishing: Applying matching grout and silicone sealant for tiles, or replacing window beads and seals to ensure a weatherproof finish.

Typical Costs

Repair costs vary significantly based on your location in the UK (with London and the SE commanding a premium) and the specific materials required. High-end porcelain tiles or bespoke toughened glass will increase the total price.

Pro Tip: Always keep a spare box of tiles in the loft. Finding an exact match for discontinued tile ranges years later is one of the most difficult parts of a repair job.

How Long Does It Take?

• Single tile replacement: 1–2 hours (plus drying time for adhesive before grouting).
• Replacing a misted glazing unit: 45–90 minutes once the new unit has been manufactured.
• Re-grouting a shower cubicle: 3–5 hours depending on the hardness of the old grout.
• Window hardware repair (hinges/locks): 1 hour per window.

DIY or Professional?

Basic tile repairs are manageable for a confident DIYer with the right tools, such as a grout rake and tile nippers. However, achieving a level finish that matches the existing layout requires a steady hand and experience.

Window repairs, particularly glass replacement, should generally be left to professionals. Handling large shards of glass is hazardous, and incorrect installation can lead to draughts, leaks, or even voiding your home insurance if safety glass regulations (Part K) are not met.

Choosing the Right Tradesperson

When looking for a tiler or a window specialist, focus on those who specialize in "remedial" work rather than just large-scale installations. Many large firms avoid small repair jobs, so local independent tradespeople are often your best bet.

• Check Credentials: For windows, look for FENSA or CERTASS registered installers, though these are more relevant for full frame replacements.
• Insurance: Ensure they hold valid Public Liability Insurance (minimum £1 million).
• Waste Disposal: Ask if they will take away the old glass and broken tiles, as glass cannot be put in standard household recycling.

Questions to ask:

• Do you have experience matching old grout colours?
• Is the replacement glass "Low-E" to match modern thermal standards?
• Will you be using a waterproof tanking membrane for bathroom tile repairs?
• How long do I need to wait before using the area (drying times)?

UK Regulations

• Building Regulations Part L: Replacement glazing must meet specific thermal efficiency (U-values) to comply with UK energy standards.
• Building Regulations Part K (and Part N): Safety glass (toughened or laminated) must be used in "critical locations," such as doors, windows next to doors, or any glazing below 800mm from the floor.
• British Standard BS 5385: The code of practice for wall and floor tiling, which professionals should follow to ensure durability and water resistance.

Common Problems

• Mismatched Grout: New grout often looks brighter than old, weathered grout. A professional may suggest "cleaning" the old grout to help it blend.
• Blown Seals: If a window is "foggy" inside, the seal has failed. This cannot be repaired; the entire glass unit must be replaced.
• Substrate Failure: Tiles often crack because the floor underneath is moving. Simply replacing the tile won't fix the underlying structural issue.
• Blown Plaster: Removing old wall tiles can often pull chunks of plaster off the wall, requiring extra "patching" time and cost.

Frequently Asked Questions

Can you repair a single cracked tile without removing the whole floor?

Yes, individual tiles can be replaced. The tradesperson will carefully rake out the surrounding grout and use a hammer and chisel (or oscillating tool) to break the tile from the centre outwards to avoid chipping neighbours.

Why is my double glazing misted up inside the panes?

This is known as a "blown" unit. The perimeter seal has failed, allowing moisture to enter the gap between the glass. The only permanent solution is to replace the glass unit itself, though the frame can usually stay.

Do I need safety glass for my window repair?

If the window is within 800mm of the floor or located in a door or side panel, UK Building Regulations require toughened or laminated safety glass to prevent injury if it breaks.

How do I find an exact match for a 10-year-old tile?

It is difficult. If you don't have spares, a specialist can try to match the size and colour at a tile merchant, but "batch variations" mean it may never be a 100% perfect match.

Can you grout over old grout to freshen it up?

No, this is a common mistake. New grout will not bond well to old grout and will quickly peel away. At least 2-3mm of the old grout must be removed first to allow the new grout to "key" into the joint.