'New builds', if the builders are worth there salt, they should be allowing for alarms, if they are not then the architect is imho at fault-not rocket science is it, allow for sky, BT, data network etc etc for your multi engineered home-ahhhhh- what about an alarm to protect all this high tech stuff.........ooops...to late.
I'd rather do mini trunking/blaze on top of skirting, it can be easily 'caulked' and blend in once painted, you'd have to look closely to spot the 'addition', protected, easily accessed in the future if required for further cables etc, no realistic chance of damage without obvious signs of such.
Wasn't me, just said there are other ways.
Lol.