Best practice? Component variants/mirrored textures

[kevo]

What's recommended best practice for having variations of an object?

I've got a set of house types modelled that I use to model site plans. Up until now I've just had a single "As handing" component that I flip/mirror as needed, and it's generally been fine.

I've then left the roof plane as default material, which allows me to apply different coloured roof tiles to individual plots. - this also has generally worked fine. Until I come to produce a render.
The process of mirroring blocks is obviously mirroring my materials in the process, which as straight forward textures is ok, but it's doing weird things with displacement/bump maps.

How do I go about having a set of reusable components (that contain lots of sub components) without ending up with lots of 'unique' duplicates for the mirrored versions?

Do I need to delve deeper in to dynamic components, could they help me? Allow me my variation of roof tiles, and more - brick styles, fascia & window frame colours, etc too?

Thanks!

[kevo]

Could a moderator move this

Thanks!