How much should I budget for tile waste and extra materials on an Ottawa renovation project?

You should budget 10 to 15 percent extra tile beyond your measured square footage for a standard rectangular room with a straightforward layout, and 15 to 20 percent extra for rooms with diagonal patterns, herringbone layouts, lots of cuts around obstacles, or complex shapes. For natural stone tile where colour and veining vary between boxes, bump that up to 15 to 25 percent to ensure consistent appearance across the entire installation.

This is not just about accounting for breakage during cutting — though that does happen, especially with brittle materials like glass mosaic and some natural stones. The bigger reason is that tile installation inevitably produces offcuts that are too small to use elsewhere, and layouts rarely work out to perfectly whole tiles in every direction. A skilled installer will plan the layout to minimize waste by centring the tile pattern in the room and avoiding thin slivers at edges, but some waste is unavoidable regardless of how carefully you plan.

In Ottawa specifically, there is an additional reason to order extra tile: replacement availability is not guaranteed. Tile styles, colours, and even production runs change constantly. If you need to replace a cracked tile three years from now and your exact tile has been discontinued — which happens more often than you would think — you are stuck with a mismatched patch or a full retile. Keeping a box or two of spare tiles stored flat in a dry area is cheap insurance against this problem. Ottawa's smaller tile market means fewer local suppliers carry deep back-stock compared to Toronto, so special-order tiles are particularly risky to buy with no surplus.

For materials beyond the tile itself, budget for thinset mortar (one 50-pound bag covers roughly 60 to 80 square feet depending on trowel size and tile format), grout (coverage varies widely by joint width and tile size — your supplier can calculate this), waterproofing membrane if applicable, backer board for wet areas, and spacers and leveling clips for larger format tile. These ancillary materials typically add $2 to $5 per square foot on top of the tile cost, and running short mid-project means a trip to the supplier and a delay while adhesive from the previous day's work may have already set up.

The golden rule is that buying 15 percent more tile upfront costs far less than the headache of being short by even a few square feet during installation.

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