Cracked sink: when a repair is suitable and when to replace it

First establish where the water is coming from

Water underneath a sink can come from a tap connection, waste fitting, trap, seal or the sink itself. A visible crack is important, but it is not proof that every drip comes through it. From a dry, safe position, note where moisture appears and whether it occurs during use or while the sink is idle.

Stop using the fixture if water is escaping. Isolate the relevant supply if it can be done safely and is necessary to control the leak. Keep water away from electrical equipment and protect the cupboard contents. Do not repeatedly fill the sink just to demonstrate a fault.

Identify the material and extent of damage

Ceramic, composite, stainless steel and other materials have different repair options. Look for a maker's label, product paperwork or the original installation invoice. Take an overall photograph and a closer view of the damage without pressing on the cracked area.

Describe whether the crack is on the rim, bowl or around the waste, whether pieces are loose and whether it has grown. A hairline mark and a crack through the structure are different problems. Avoid relying on a photograph alone to decide that a damaged fixture is safe to keep using.

Why a cosmetic patch may not solve the problem

A repair kit may be intended for surface chips rather than a crack through the sink. Compatibility, preparation, curing and permitted use depend on the product and sink manufacturer. A filler covering the mark does not necessarily restore structural strength or seal a hidden path for water.

Ask the sink manufacturer or a suitable repair specialist whether the particular defect is repairable. If the fixture is leaking, unstable or has sharp damaged edges, replacement may be more appropriate. Avoid recommending a universal glue or sealant without knowing the material and damage.

What affects a replacement quote?

Replacement involves more than buying a similar-looking bowl. Dimensions, mounting style, worktop opening, tap holes, waste and overflow connections, and support all affect compatibility. An undermounted sink can require different access and work from an inset model.

Ask whether the quote covers removing the old fixture, disposing of it, reconnecting taps and waste, sealing and testing. Establish whether worktop alteration or other trades are needed. Keep the existing model details available so replacement options can be checked before ordering.

Useful details to send before a visit

1. Photograph the entire sink, the damage and accessible connections below it.
2. Provide the brand, material and model if known, plus approximate dimensions.
3. Explain whether water is escaping and how the fixture is mounted.
4. Mention a waste disposal unit, unusual tap arrangement or limited cupboard access.
5. Give your postcode, floor and parking or entry arrangements, and confirm who can authorise work.

After repair or replacement

Ask for the care instructions and any curing period before use. Keep product and warranty information. Once the fixture is ready for use, follow the agreed checks and report any moisture promptly rather than continuing to use a leaking installation.

In rented accommodation, notify the landlord or agent and retain photographs and correspondence. In an Edinburgh flat, explain if leakage may affect the property below so access and investigation can be coordinated. Damage alone does not establish responsibility; keep the discussion focused on observations and the required work.