Leonard Mead seems to celebrate his 'deviant' behavior of evening walks by mocking the houses and their inhabitants as he walks past,
"Hello in there," he whispered to every house on every side as he moved. "What's up tonight on Channel 4, Channel 7....." (first page).
There is an implication that the houses are rather nondescript if not homogeneous, which adds to the sombre, depressing mood. This is reinforced through the metaphor of walking through the neighbourhoods as being equal to walking through a graveyard, which further adds a sinister edge to the mood. Details given of the houses being shrouded in darkness, flickering lights creating gray phantoms on inner walls, low murmuring noises and the buildings being "tomb like" all contribute to this particular mood being created. So too does a description of the streets being in an advanced state of urban decay with uneven and broken up sidewalks.
Television is of course the preoccupation within each house, and its pervasive, dominant influence has evidently pulled a dark and sterile pall over this future-time city.