Declines were registered in all segments of Ottawa's housing market as overall starts fell to 336 this year, from 583 last March.
Single-detached homes fell by 47 per cent, to 74 starts, while multiple-family housing fell 41 per cent, to 262 starts.
Semi-detached and apartment housing starts each fell by more than 60 per cent, while townhomes moderated less at just under 12 per cent.
Nepean and Gloucester saw the most construction activity that month, with slowdowns registered in Cumberland, west Kanata and Goulbourn.
On a year-to-date basis, the national capital saw a 3.5-per-cent increase as starts increased to 1,134 from 1,096 last year.