Is grout required behind shower knob trim plate?
Not a big problem, easier to fix it yourself than to hassle with the builder. Remove the caulk and the inter-tile spacer(s). Buy a small pot of prepared grout (same color), and fill in the empty spaces between the tiles. This is easy to do, just use a flexible spatula to push the grout paste into the spaces to fill &amp; then remove the excess (with same spatula). Then wipe the new grout line lightly with a moist fingertip to smooth the surface. Let it dry, then re-attach the cover plate and re-caulk it.