Assessment of tile work offer. Are surcharges justified?

Had the same topic this year, also compared externally. What I remember from that: 1. As soon as more tilers are needed, it becomes significantly more expensive. (Depending on the size of the tile.) 2. Floor tiles on the wall are also more expensive (I don’t remember the exact reason anymore, but this was the case with both the general contractor and external tilers). 3. Various things like end profiles were more expensive than we expected. Overall, the general contractor was about on par with the external tilers for us – probably also because we didn’t get credited the full price for the samples. I don’t remember expansion joint profiles, we didn’t have rectified tiles or sloped tile floors. The rest strongly resembles our prices.

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Gluing floor tiles to the wall is a higher effort, that is definitely true and in principle every tile is therefore a wall and floor tile. In this respect, the surcharge is probably justified.

That contradicts itself. Or at least one does not follow from the other. Actually, there are floor tiles that do not absorb water and are specifically made for that. They are more laborious to lay on the wall. Then there are tiles that are not suitable for the floor (too thin or too smooth). There are tiles that are probably too thick for the wall (terrace tiles) and would then slip down again due to the too high own weight. But nowadays you basically only see wall and floor tiles, and not only at DIY stores but also at specialist dealers. Then one could say there are more openings and not straight cuts on the wall, but then you could also calculate those separately. And otherwise, I would even describe tiling on the floor as more laborious (higher requirement for flatness/full-surface adhesive bonding is more important, as hollow spaces would be immediately detectable when stepping on them. Expansion joints are required on the floor, higher requirements for waterproofing in the shower. Tiled surface is not directly walkable, so more precise laying is required). Therefore, if these are not actually explicit floor tiles, I would reject a surcharge for that. But it is also true that you probably have no choice.

That contradicts itself. Or at least one does not follow from the other. (...)

No. With the appropriate additional effort, you can stick any tile on the floor or on the wall. It has one or the other disadvantage, which you have to point out to the customer or create a notice of concerns and have it signed. Then it’s fine. If someone really wants a wall tile on the floor, they just end up constantly falling on their face when it’s wet. I told the customer that and he signed that he still wants it. Please. Maybe he wants a slide, I’m not in a position to judge that.

You can, with the corresponding effort, also mount an indoor light outside. You can also install an outdoor light inside. Only it’s more expensive because with the indoor light outside you have to do additional work and with the outdoor light inside you pay the manufacturer’s extra cost that you don’t actually need inside...

That’s the point. It’s more expensive because it’s more effort.