Karori could lose the site for its planned event centre if $500,000 is not raised by June.
The Karori Community Hall Trust has been leased a building site by Wellington City Council in the "heart of Karori", an area which includes the library, youth and recreation centres.
Trust chairman Wallace Simmers said $4 million had to be raised for the centre by May 2015, or the lease on the land would lapse.
He said $330,000 had been raised, but another $500,000 was needed in pledged donations by June or the project would be abandoned.
The amount was enough to show the community was behind the project and the trust could then appeal to charities for more funding.
Mr Simmers said the people of Karori were capable of raising such funds.
"Masses of people say it's a good idea, but that's easy to say," Mr Simmers said.
The Karori Community Hall Trust was formed in 2007 and has been planning a new centre to replace the former St John's Church, which is now being used as the community hall.
The hall has 30,000 users a year, but is earthquake prone and its facilities need to be upgraded.
Mr Simmers said the council was unable to fund improvements and the trust feared Karori could be left without a hall if the event centre did not go ahead.
Many other community spaces in Karori were running at capacity, including the community recreation and youth centres.
- The Wellingtonian