When I said house to house I meant localized. For example a section of Paris. But I don't know what the security forces require other than I presume they want more people, more technology, more freedom from some laws that restrict them and more freedom from protests because they are infringing on our current rights.If we could search every house in the UK, it wouldn't help. There's not enough manpower.
As difficult as it is, the only real solution is better / more accurate targeting of specific individuals.
It makes much more sense to relinquish freedoms for those under specific investigation - phone taps, internet monitoring, surveillance etc than for a carte blanche approach that we all have to give up privacy so random checks can be made. If random checks are the answer, we're asking the wrong questions to start with.
As I said way back it's a danger to give them too much trust but I wonder if we have to.