The main station was extended about eastwards; additional shops and offices were constructed east of the new train shed up to the parish boundary with Bishopsgate-Street Without. A new roof was built over the new construction. The outer wall was constructed with Staffordshire blue brick and Ruabon bricks. The four train shed roofs were carried out by Messrs. Handyside and Co., supervised by a Mr Sherlock, the resident engineer; all the foundations, earthwork and brickwork were carried out by Mowlem & Co. Electric power (for lighting) was supplied from an engine house north of the station. Additional civil works included three iron bridges carrying road traffic over the railway on Skinner, Primrose and Worship Streets. The bridge ironwork was supplied and erected by the Horseley Company. John Wilson was chief engineer, with W. N. Ashbee as architect. As part of the works, the GER was obliged by Parliament to rehouse all tenants displaced by the works, with 137 put into existing property and the remaining 600 into tenements constructed at the company's expense.