In 1883, a group of Welsh people, formerly slate miners from Blaenau Ffestiniog, arrived in Blackstone to work for Thomas.

Shortly after their arrival, they held a Protestant church service under a mulberry tree on the banks of Bundamba Creek.

The building was painted and new seats were made in 1892, the work supervised by architect George Brockwell Gill who had taken over Shenton's practice.

[1] A number of historic photographs, memorials and memorabilia have been placed on display in the main body of the church and in the rear meeting room.

A cedar fireplace surround from the mansion has been converted into a combined Welsh pioneers/World War II memorial.

Subsequent eisteddfodau were held in the church or in the Ipswich School of Arts as interest in the eisteddfod movement grew.

A front entrance porch with separate gable roof has a decorative fretwork pediment infill.

[1] The interior feature some fine cedar joinery in the sanctuary area and liturgical fitments including a silky oak minister's chair.

A pair of leadlight windows featuring the Welsh dragon are above the doors in the rear wall leading into the vestry/meeting room.

[1] A continuous open-fretwork ventilator runs the full length of the nave walls immediately below the roof springing point.

[1] United Welsh Church, Blackstone was listed on the Queensland Heritage Register on 21 October 1992 having satisfied the following criteria.

The interior contains historic photographs, memorials, plaques and memorabilia and yields information about Welsh customs and culture maintained in an Australian context.

The simple traditional form of the exterior and its associated large camphor laurel tree have landmark qualities near Bundamba Creek at the approach to the suburb of Blackstone.

The simple traditional form of the exterior and its associated large camphor laurel tree have landmark qualities near Bundamba Creek at the approach to the suburb of Blackstone.