The east Londoners are widely considered to have done some of the best business of the summer overall.
Left-back Stephen Hendrie, goalkeeper Darren Randolph midfielders Pedro Obiang, Martin Samuelsen, Manuel Lanzini and Dimitri Payet and defensive reinforcements Angelo Ogbonna and Carl Jenkinson were all recruited over the summer.
That was before a quite memorable deadline day in east London where no less than a further four players were brought in.
Hull City striker Nikica Jelavic, Barcelona midfielder Alex Song, Chelsea star Victor Moses and Nottingham Forest's exciting and powerful winger Michail Antonio all signed up as the deadline day headlines were dominated by the Hammers.
With the signings being announced on deadline day, to the outside world it may have looked like the East Londoners were panic buying.
'Deadline day? It was a breeze'
But Bilic has told West Ham's official website that deadline day itself was the easiest of the entire summer for him as the deals were already in the bag.
"I think we did well with our business around the deadline," Bilic told whufc.com.
"I think we've done a good job – that's what we wanted and it looks like the last day was a hectic day, but really the deals were done a few days ago and we just needed the papers.
"We knew from the start what we wanted and for a few players we waited until the end because it was impossible to get them done earlier because of their clubs."
The Hammers needed strengthening before letting nine players leave either permanently or on loan this summer.
Strikers Carlton Cole and Modibo Maiga, right back Guy Demel, captain Kevin Nolan and 'keeper Jussi Jaaskelainen were released while star midfielder Stewart Downing was sold to Championship promotion hopefuls Middlesbrough.
Matt Jarvis has departed on loan to fellow Premier League side Norwich City. Meanwhile, youngsters Diego Poyet and Reece Burke have also been sent out on loan to MK Dons and Bradford City.
But the Hammers have undoubtedly strengthened overall with a net spend of around £25-30 million including loan fees.