Bosses at Inspire Suffolk are making a final appeal for votes in the last week of a competition.
The sports and education charity has plans to overhaul its Ipswich venue and make it more accessible, but needs funds.
Persimmon Homes launched its Healthy Communities scheme with the aim of giving £615,000 to support amateur youth sport in England, Scotland and Wales.
Thirty finalists nationally are now competing for the top prize with the winner to be announced at a gala dinner at York Racecourse on March 22.
One group will scoop £200,000, while two runners-up will win £50,000 each. Each of the remaining 27 finalists will win £5,000 each.
Voting is open until March 16.Inspire Suffolk hopes to invest the money in revamping its sports dome in Lindbergh Road, which is used by numerous sports and community groups within the area.
The charity has plans to make the changing rooms accessible; install a lift to the first floor viewing gallery; build a dedicated referee changing room; create a secure reception and entrance area; install seating for the viewing gallery, remove all asbestos and install energy efficient heating and lighting systems.
Terry Baxter, chief executive of Inspire Suffolk said: “We are urging people to back us and take the time to vote, as such a large amount of money would be a real game changer for everyone who benefits from Inspire Suffolk’s services and premises.
“At Inspire Suffolk we deliver multi-sports and disability sports sessions develop technical skills, confidence, self-esteem and motivation, which the money will really benefit, as well as other members in the community which use our venue.
“Winning the £200,000 would enable our charity to make vital improvements to our venue to ensure the charity can continue to support the community.
“It has been great to see the community support so far and we want a big driving force with everyone getting behind us for the last week.”
Inspire Suffolk provides sporting opportunities to people from all walks of life across the county, including some free sessions for children.
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