Tigro Tile & Grout Restoration Inc.

Our tiles were still fairly new, but the white grout installed by the builder was becoming discoloured and looking dingy. There are small pinwheel tiles in the main bathroom and shower, and small hexagon tiles in the powder room, which means there were a lot of narrow grout lines to address. Another company refused to do the job, stating that it was impossible to change the grout colour in the way I'd requested.
I called TiGro based on the excellent reviews on Homestars. I spoke to Ramiro, the owner, and described the job, texted him some photos of the tile and received his assurance that he could complete the job in one day. He has a busy schedule, but was able to fit in my job within three weeks, which seemed fast to me.
On the day of the work, Ramiro arrived at the time he'd said he would and prepared the areas for cleaning and the grout for recolouring. Since I work from home, he was careful to finish the work on the main bathroom before starting work on the powder room to minimize the time that the washroom was unavailable. Ramiro and Ronal worked quickly and carefully, kept the surrounding areas clean, and were polite and personable, checking details with me as needed to make sure they were correct. They ended up applying a coloured epoxy grout over the existing grout to colour and seal it, and it looks perfect. The small tiles are now more visible and the light grey grout doesn't show dirt from foot traffic in the way the white did. They took care to remove the silicone between the walls and the floor and replaced it with clear instead of the white that had been there, which made an unexpected improvement to the appearance of the shower.
I wouldn't hesitate to hire TiGro again, or to recommend them to friends. The work was excellent, Ramiro and Ronal were friendly, professional and appropriate, and the cost was fair for the scope of work needed. I'm very happy with the results.