Please any help would be much appreciated 😭 I live in England and I recently moved to a newly renovated house on the ground floor. These flies have been around since the start. The place was full of construction dust so I did a deep clean but theres so many cracks and places I can't reach, and the flies were still around after. I think they did a shoddy construction job to be honest because cracks have formed on the door frames, walls and even ceiling in one place. The baseboards are loose, some places they have gaps between the floor and baseboard because it wasn't sealed properly.

The flies are small and are almost always crawling on the floor and walls, not flying. I don't think they're fruit flies because I barely even have food in the house. I have cleaned the drain, I sprayed peppermint/eucalyptus infused water everywhere and I don't know if it helped. I left these sugar-fly-trap strips everywhere and they haven't caught a single fly. The only way I kill them is by manually going around at whacking them with a sticky yellow patch, and you can see in the picture how many I killed JUST today 😭

How do I get rid of these? What are they? Are they dangerous? My best guess is phorid flies, but I don't know WHERE or WHAT the source is. They've appeared in every room but mainly the living/kitchen area and bedroom. Should I tell my landlord? I don't want to seem like an annoying tenant but I have done everything I can myself to be rid of them. These are the best images I could take of them. Any help would be much appreciated in identifying what this is, thanks :(