WDH will replace its fleet with new Citroen Nemo, Berlingo, Dispatch and Relay vans across four years as part of the new deal.
The deliveries will start with 217 vans in 2010, followed by another 130 in 2011 and a final 40 in 2012.
A small number of vans will be ordered in 2013 to meet any other requirements WDH may have, it has been announced.
The larger Berlingo, Dispatch and Relay vans will be used by the WDH trades people, while the more compact Citroen Nemo will be used by supervisors.
They will be used to look after over 31,000 houses in the Wakefield area for one of the largest housing associations in England.
Robert Handyside, Citroën’s Commercial Vehicle Operations Manager, comments: "This major WDH order reflects the benefits of Citroën’s versatile, low emissions, fuel efficient approach to the LCV sector. Across the board, Citroën offers an unrivalled choice of low whole life cost, green business transport solutions."
For example, the Citroen Nemo comes with a choice of two Euro 5-compliant engines. The petrol option is a 75bhp, 1.4-litre engine, while the diesel is a 1.3-litre HDi delivering 75bhp.
In addition, the diesel is fitted with fuel-saving Stop & Start technology and as such, offers CO2 emissions as low as 109g/km.
The figure is of particular interest to fleet operators, who will benefit from lower emissions-based business tax with the Nemo.
The Citroen Nemo van offers a load capacity of up to 2.8 cubic metres and a 2.5 metre long load space. Prices start from £9,165.
The Berlingo van starts at £11,195 and the Dispatch and Relay start from £15,570 and £17,540 respectively.