More on KentOnline
Co-owner Terry Casey is already looking into the possibility of further expansion at the Gallagher Stadium - with the help of FA Cup earnings.
Maidstone have only just raised capacity to 3,000 after winning the Ryman League.
But with Jay Saunders’ side third in National League South, the club can’t ignore the potential for another promotion.
They would need to increase capacity to 4,000 for the National League and are exploring options.
Mr Casey said: “The FA Cup money is being used to pay off the summer building works.
“We’re just spending a little bit on the feasibility study of increasing to 4,000.
“Everything we’ve done, we’ve used our own money and I don’t want to get in a situation where we have to borrow.
“The cup run wasn’t crucial but it’s helping and if win on Sunday that will be another £18,000.
“You’re on a merry-go-round and you can’t get off, can you?
“You can’t say ‘let’s go down to Concord and lose 1-0 because we can’t afford to go up.’
“It’s going to cost at least another £500,000 and probably £750,000 to £1million.
“The feasibility study is looking at all the different options.”