The trade body has published its latest pay performance leagues showing a slight improvement among all members.
The average time taken to pay bills fell to 43 days from 45 when the first round of statistics were published six months ago.
Four clients – British Land, Landsec, Heathrow and Berkeley Homes – top the payment table all settling bills before an average of 30 days.
Willmott Dixon is the quickest-paying contractor on 32 days.
For a full interactive list of payments speeds by firm click here
Build UK chairman and Mace – who had an average payment time of 34 days – Deputy Chief Operating Officer Mark Castle said “there is still a lot of work to be done.”
Castle said: “These improvements demonstrate the importance of increased transparency on the issue of payment.
“Build UK has held a mirror up to its members who have responded by taking significant steps to review and address performance within their organisations.
“There is still a lot of work to be done – for example, encouraging further transparency around disputed payments – but these results are a clear move in the right direction and show that the industry is serious about tackling this long-standing issue.”