Do we have to pay for our new stand up front? What if we are waiting for grant money?

Our standard spectator stand payment terms are 20% of contract value as deposit with order, followed by 35% on commencement on site, 35% on erection of steel frame and terracing, and 10% on completion. We understand that sometimes grants take a while to apply for and we are always happy to discuss the best way forward with each individual club.