Have you considered keeping the house plan and site plan in the same plan?
You can set project north in:
Options > Project Preferences >Levels and Project North
Turn the compassy thingy
This way you still work straight with plan north being in any direction.
There is also 'Oriented View' allowing you to work on two different project grids so one could be set parallel to the house, the other parallel to project north, should you need to. Look it up in Help while your looking up hotlinking.
AC 6-26 - Intel i9-9900K - RTX3090 - Windows 10 - 64GB RAM