The value of building permits fell 21.1 per cent to $5.3-billion in April after increases in February and March.
Statistics Canada reports the non-residential and residential sectors both declined in April, with Ontario posting the largest decrease.
The value of non-residential permits fell 33.2 per cent to $1.9-billion, due primarily to lower construction intentions for institutional buildings in Ontario.
Residential permits came in at $3.5-billion, down 12.6 per cent from March.
StatsCan blamed the decrease mainly on a drop in Ontario's multi-family component.
The total value of permits fell in seven provinces, with Alberta, New Brunswick and Newfoundland and Labrador posting gains.