They're on a free standing trellis that doesn't touch the house.
Two actually, a vertical mesh straight up from the garden bed adjacent to the brick paved verandah, and another that's almost horizontal with a slight slope away from the house.
Most of the summer growth is dense on the horizontal (like an awning) with grape bunches developing and hanging down for easy picking when rips.
English ivy (hedera helix) can damage mortar, but grape vines don't have holdfast structures like hedera that can sink into mortar. Plus, hedera helix is so dense that rotting vegetation and sheltered animals can also cause problems. Grapevines have tendrils that grab onto and twine around something like wires or a trellis.
Vitis vinifera has a deep vertical root that can fit in even narrow places and don't causes a lot of trouble. Climbing roses can vary, some are huge and they trow a lot of garbage, but short climbers normally are manageable. If they grow too much, you can just prune it to a desired size
Ivy or Wisteria are a different question. The first will damage walls and the second can crush anything like a vegetable python
Most vines, including Ivy don’t damage bricks walls that are build well. I don’t know about grapes but most ivy uses “suction cups” to trap on directly to the bricks. I think the misconception that they damage mortar might come from the moisture the plants can trap which can then damage the masonry. Or maybe it’s because the plants hide damage until it gets serious Mortar doesn’t last forever after all. Anyway, if you build your house or wall properly you can grow stuff on it with basically no downsides outside of having more bugs (and the things that eat them) on your wall that you might want.
It might not work so well on the Lego brick walls that are glued onto the front of concrete these days, but that would just be a guess.
