The shed is the result of four years of work by members and government and community donations of about $750,000.
Chairman Geoff Wiltshire said the members were proud of their achievement.
�From an idea in late 2010 through to now, the members have remained optimistic that a good outcome was possible and the end result certainly vindicates that confidence,� Mr Wiltshire said.
�With a current membership of 170 and a diverse range of activities available for members, the Gosnells shed is probably one of the better facilities of its type in the state.�
Mr Wiltshire thanked sponsors for their contributions, including Lotterywest, Amaroo Caring Services, the Rotary Club of Southern Districts for initiating the project and the City of Gosnells.
Amaroo leased its Lewis Homestead property in Gosnells while the main shed was built, the Rotary Club of Southern Districts initiated the project and provided seed funding and the City also provided seed funding.
Lotterywest contributed more than $500,000 in funding.
�Members have contributed immensely to the success of this project through sheer hard work, innovative thinking and persistence and thoroughly deserve the facility they have finished up with,� Mr Wiltshire said.
�It was great day for us having the Premier and Minister responsible for Lotterywest visit and see the result.�
Mr Barnett said the shed was a great example of community collaboration.
�This is a place for men of all ages to share and develop skills as well as socialise, find support and participate in community life,� Mr Barnett said.
Guests included Gosnells Mayor Dave Griffiths, councillors, Planning Minister John Day, Mental Health Minister Helen Morton, other members of parliament and representatives of the Rotary Club of Southern Districts, Amaroo, Lotterywest, other men�s sheds and local businesses.