In a trading update for 17 June 2018 to 3 November 2018, the FTSE 250-listed firm said its total revenue from its UK depots' increased by 7.5%, with a 6.1% rise on a like-for-like basis.
The group said the increase in revenue was driven mainly by volume growth, with its gross margin performance during the period in line with management expectations.
Howdens said it expects to add a total of about 33 depots in the UK in 2018, taking the total number of depots in the UK to around 694.
The group expects an incremental cost in the second half from the increase to its previously announced depot rollout programme, and sees an additional working capital outflow at the end of financial year 2018 of up to £50mln.
The company said it remains on track to meet the board's expectations for the full year and added it expects to release its 2018 preliminary results on 28 February 2019.
In late morning trading, Howden’s shares were 2.7% higher at 484.40p.