Had a bit of a look at the "very low income" area of Surrey. Seems like this is mostly "McMansions", often 4000+ sf homes, built about <25 years ago and worth about $700,000-$1,100,000.
However, if you look at the actually census data you start to understand. Ex this section of the neighbourhood:
https://www.google.ca/maps/@49.12920...7i13312!8i6656
Bound by 70a Ave, 127a St, 68a Ave and 126 St.
If you count the number of houses on google maps, there's 99 of them. However, according to census data, this area contains 272 dwelling units, of which 246 are occupied, with a total of 1046 residents. So in other words, the typical house is actually a triplex or at the very least a duplex (avg 2.75 units/house) and is home to an average of 10.6 residents.
The census data also reports that this neighbourhood contains no single family homes, only duplexes (8% of units) and low rise apartments in buildings with 3+ units (92% of units).