Members of Shropshire's Islamic Foundation need to raise around £1.5m to create a mosque complex.
They have bought the former Territorial Army building in Wellington, Telford and have planning permission to convert it to a mosque.
Saleh Laher, a member of the foundation, said it hoped to have the building ready for use in the next 18 months.
He said the aim was to restore the building to its original condition.
The new mosque would not have a dome or a Minaret, said Mr Saleh.
He said it would look more like a Northern African mosque with a castle frontage and was to be created out of the four existing buildings in the complex.
There will be separate prayer facilities for women, a room for funerals, a community hall and classes for children to learn Arabic and Koran reading.
Mr Saleh said the group would ask the local community for cash, then the Muslim Council of Britain, Islamic Aid and Muslim Aid.
They also plan to approach international bodies based in Saudi Arabia and Kuwait which set aside funding to help build mosques throughout the world.
He added they would also be applying to English Heritage and other similar organisations for help with the cost of restoring the 1950s building.
It is hoped that work on the conversion will start in the first quarter of next year.