[@TheHangedMan]

Pretty darn high, it'd seem.

I'd say that up until about a mile from the house, there's no longer a road or path - they've been intentionally covered up as well as nature taking over the untended. The house is still a house, so it'd be visible from higher peaks in the mountains or from airplanes and such, but people simply can't find a way to get there by path, and going off the path is dangerous anyway.

If determined, one could get there. Or if wounded and wandering around, I guess... So accidental would mean just ditching any clear path.