DCHP-2

backsplit back-split DCHP-2 (October 2016)

• n. & adj. — Construction

  a house with an added level at the back.

  Type: 5. Frequency — Backsplit is highly frequent in Canada, and it may be Canadian in origin. The term preferred in the US appears to be "front-to-back split". According to internet domain searches, the term is almost exclusive to Canada (see Chart 1).
  See also COD-2, s.v. "backsplit", which is marked "Cdn", and OED-3, s.v. "backsplit", which is marked "Canad.".