[1] In January 1848, Benjamin Glennie arrived in Sydney in the party of Dr William Tyrrell, first Bishop of Newcastle (whose diocese included all of present-day Queensland).

On 20 August 1848, Glennie presided over the first service of the Church of England on the Darling Downs at the Royal Bull's Head Inn at the town Drayton (now a suburb of Toowoomba).

[2] By the end of 1850, Glennie had built a slab hut with a shingle roof as his parsonage at Drayton with two of the rooms being used for the church.

[6] Lange Powell died before the job was completed and construction was then supervised by Dods and Thorpe Architects of Brisbane.

[1] St Mark's Anglican Church is a sandstone building located on the intersection of Grafton and Albion Streets, Warwick.

The building conforms to a traditional cruciform plan, with additions in the corners of the chancel and transepts, and a tower abutting the western end of the nave, adjacent to the entrance.

Tripartite elongated rectangular window openings are found on the upper, cement rendered, section of the tower.

[1] The north and south elevations of the church consist of the transepts with small entrance porches and the nave and 1939 chancel extensions.

The 1939 extension of the western, entrance end is distinguishable by squared headed window openings and wider buttress spacing.

[1] The chancel, which is housed in a gabled section of lower height than the body of the church, has a ceiling lined with timber rafters which are supported on simple sandstone corbels.

Lining the lower part of this rear wall is a stained timber reredos, with panels of pointed arches and carved trefoil and quatrefoil motif.

High level openings, which are now generally of glass louvres, were previously filled with timber panels, operable from inside the church, allowing light and ventilation.

A vestry, in the addition between the south transept and chancel, has rendered walls and a plaster ceiling, with sandstone quoining around the openings.

[1] A particularly noteworthy feature of the interior are the stained glass lancet panels, paired in the nave and, singularly in the transepts of the church.

These William Bustard designed panels are very finely worked with figures housed in Gothic inspired architectonic forms.

[1] The church has associations with prominent early Brisbane architect, Richard George Suter, and with the first Rector of Warwick, Benjamin Glennie.

St Mark's is of considerable aesthetic value; it is a well composed building on a prominent site, which is an important element of the surrounding streetscape.

The building contains many finely crafted elements including internal joinery such as the ceiling and roof trusses, reredos and seating pews; glazing and stonework.

The William Bustard stained glass windows of St Mark's are of considerable creative and technical achievement.