Can I change my grout colour from white to grey without retiling in my Ottawa bathroom?

Yes, you can absolutely change your grout colour from white to grey without retiling, and it is one of the most dramatic low-cost bathroom refreshes you can do. There are two main approaches: grout colourant (the easier option) or full regrouting (the more permanent option).

Grout colourant — sometimes marketed as grout paint, grout stain, or grout renew — is a pigmented topical coating that you brush or roll directly onto existing grout lines. It bonds to the grout surface and covers the old colour completely. Going from white to grey is one of the easiest colour changes because you are going darker, which requires fewer coats and covers imperfections more readily than going lighter. Quality grout colourant products from brands like Polyblend, Mapei, and Grout Renew cost roughly $15 to $30 per container and cover 50 to 150 square feet depending on joint width. For a standard Ottawa bathroom, materials run $20 to $50.

The application process is straightforward but requires patience and clean lines. Start by cleaning the grout thoroughly — any dirt, soap residue, or sealer residue will prevent the colourant from adhering properly. Strip any existing grout sealer using a sealer stripper product and let the grout dry completely. Then apply the colourant with a small foam brush or the applicator included with the product, working in small sections and wiping excess off the tile face immediately with a damp cloth. Most products require two coats with a drying period between them. The whole project takes a weekend for a typical bathroom and is well within DIY territory.

The limitation of grout colourant is durability. On wall tile and backsplash grout that rarely gets scrubbed or walked on, it can last three to five years or longer. On floor grout in a high-traffic bathroom, expect two to four years before you notice wear, particularly in front of the vanity and toilet where foot traffic concentrates. It is a cosmetic solution, not a structural one.

Full regrouting is the permanent solution. This involves removing the old white grout to a depth of at least two-thirds of the tile thickness and replacing it with new grey grout. The result is genuinely new grout that will perform and look like an original installation. For a standard Ottawa bathroom, professional regrouting costs $300 to $800, or you can tackle it as a more ambitious DIY project with a grout removal tool ($30 to $80) and a bag of grey grout ($15 to $25).

One practical tip: if you go the regrouting route, consider upgrading to epoxy grout in grey. It costs more upfront but it will never stain, never need sealing, and maintain that fresh grey colour indefinitely — meaning you will never face this decision again. Ottawa's humidity swings and the moisture exposure in a bathroom make epoxy particularly worthwhile for shower and floor applications.

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Looking for experienced contractors? The Ottawa Construction Network connects Ottawa homeowners with qualified professionals:

• 613Bins
• JC Carpentry
• Rrenovatios
• Titley Construction
• Speedy Pete's Inc