Strange DPC situation

[RainbowMe]

We have lived in our house for a good few years now with no obvious issues, but this has worried me since I noticed last year...

The house is on a slight slope and the driveway to the side is higher than the inside floor level. In the pic, the red line shows where the DPC is on three sides of the house (and where the front door threshold/floor level is), but as you can see, the driveway is three courses higher than this. The DPC along that side is also higher than on the other three walls, 2 courses above the driveway, so the DPC isn't breached yet it is higher than the floor level inside. Surely that can't be right? We did have a homebuyers survey which did not throw up any issues with this. We are the second owners and the house is 15 years old. Am I right to be concerned?

If the driveway is original, this all suggests that the extra dpc is actually a tray to direct the water outwards above the drive level, and the courses below that are outside the damp proof layer. So it's probably not an issue.

Thanks @johnd2 - the driveway is original yes. Is this something the surveyor should have flagged up do you think, or could cause issues when we sell? It does worry me as I don't really understand why they didn't just leave a channel down the side of the house, like they have with others on the estate (well, apart from one across the road that seems to have been done the same as ours).

Maybe the others were built first and the didn't think about the levels, but by the time they realised it wasn't too late to put in the extra dpc tray needed to keep the water off.
I don't expect you will have any problems due to it.

Thanks @johnd2, that is quite reassuring. If for any reason the extra trays aren't in there and one day we started getting damp problems, would it be possible to fix? I'd imagine the driveway could also be cut away to leave a channel, but it's shared and not all that wide so there could be issues with the neighbours. I also worry that the DPC would still be too high if there isn't another one at the same height as the other three walls. I am such a worrier, on the verge of getting a surveyor round to put my mind at rest but husband won't let me as he thinks I'm being ridiculous

your dpc may be staggered look where it is on the wall attached/next to the driveway??

my house is built on slope & surveyor says that having staggered damp proof course on different walls at different heights is ok

That's reassuring @mumwon thank you. It does seem to be staggered as in higher at the side next to the driveway and lower everywhere else. Is your highest DPC higher than the internal floor though? That's my main worry - it seems like most other houses built on a slope are designed so that the floor level / door thresholds are always above ground all the way round.