The number moves while you build.
You split €16,500 across five categories: Contractors, Tiles, Fixtures and fittings, Materials and Contingency. The app counts each one down as the expenses land, and says what is left to allocate. Right now €0.
The contractors have taken €6,850 of their €7,500, tiles €2,480 of €2,800. The bathroom as a whole sits at 80%, and that is a number you see before the next order rather than after it.