The mosque in Sussex, the Masjid Noor Mosque, had its opening ceremony on Saturday to mark the end of eight months of renovation work.
The building, in Langley Drive, was previously used by the Elim Pentecostal Church and internal and external redecoration has taken place.
The association's regional president Ahsan Ahmedi said: "We have built a small extension and installed a minaret (a spire which provides a visual focal point) as well as redecorating inside and out.
"The renovations in total cost more than £100,000, all paid for by our community."
About 500 people attended on the day, including 180 who were not part of the Muslim faith.
Mr Ahmedi added: "We want to reach out to the larger public in Crawley.
"Any person of any faith is welcome to come inside the mosque and pray. There are no restrictions.
"During the opening a Roman Catholic and a Protestant both offered their prayers inside the mosque with us.
"This is one of the main purposes of our mosque. As well as being a centre for education and prayer it is a place where we can integrate with the whole Crawley community."
The mosque has a capacity of 250 people.
The mosque will also attract people who live in Brighton, Eastbourne and Haywards Heath, as well as Gatwick Airport workers.
Crawley's Muslim community also plans to use the mosque to help people in need across the town.
Mr Ahmedi added: "We want this to become a centre for the homeless and there are plans to set up a weekly coffee morning.
"This will be for people who are struggling and would like a free cup of coffee or tea."
The building was sold to the association in March 2012, with the church congregation moving services to Ifield.
Steps were taken by the community to avoid any ill feeling over the change of use.
Mr Ahmedi said: "When we bought the mosque we undertook a condition to make sure there would be no objection from the church and this was put in writing.
"If there had been any objection we would not have moved forward with this. We wanted to make sure the local community was not aggrieved."
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