The figures have been gathered in a Freedom Of Information (FOI) request to Transport for London (TfL).
It follows a major delay to the completion of the flyover reconstruction, which was initially intended to only take up to the end of September.
Works have now entered the 200-day mark, and could potentially continue for another five months up to the end of spring.
We asked TfL to confirm the hours worked by its contractors, Costain, and how many of them were working at the Gallows Corner site from June 23, the date the major roundabout and flyover were fully closed to motorists.
This data reaches only to the beginning of September 2025.
In the first week of Gallows Corner closures, 38 contractors were recorded to have worked a ten-hour shift each on Monday – Friday.
This number dipped to just ten contractors on site over the first weekend, on June 28 and 29.
According to TfL, the average hours worked in this initial week racked up to 2,100.
In June, the number of contractors working on the site between Monday and Friday was increased to 60 staff members working ten-hours a day.
The level of weekend workers remained consistent at ten.
Productivity appears to have increased, with the average hours in the first week of July reported at around 2,600 hours.
For the next three weeks up to July 27, TfL recorded an average of 3,200 hours worked a week.
These hours then fell at the end of July entering into August, down by an average of 80 hours to 3,120.
Twelve contractors were recorded at the site on the first Saturday in August, though there were no workers present on Sunday, August 3.
The first full week of August welcomed with it the highest recorded average hours in the summer, with TfL reporting these recordings at 4,260 hours.
This may be explained by the high staffing levels seen from Monday, August 4, to Sunday, August 10.
During this week, staffing levels were upped to 78 workers per day on Monday to Friday, and weekend workers were increased to 18 staff per day.
These numbers remained consistent until Sunday, August 17, when there were no staff on site.
A TfL spokesperson has advised that on the Sunday weekend shifts in August where contracted staff were not recorded to have worked, a traffic management team remained on site.
The average of hours worked was recorded to have dipped down to 4,080.
Average work hours continued to fall the following week commencing August 18.
According to TfL, 62 Costain workers worked on the site between August 18 and August 22.
Twelve people were recorded as working on the site on Saturday, August 23, with again no contractors working a Sunday for the remainder of the month.
The average recorded hours this week fell by 860 hours to 3,220.
No contractors worked on the bank holiday in August, with 57 workers returning to the site on August 26.
On August 27 TfL confirmed to this paper that works were not running on time to complete in September, just one week after the organisation provided an update in which it claimed the project was “on track”.
On Saturday, August 30, 11 staff worked, with the weekly average hours falling again to 2,390.
The delay was pinned down to “unforeseen problems”, “principally” to do with ground conditions and pockets of shale around a water main, which were discovered during works that were agreed with Essex & Suffolk Water.
A TfL spokesperson said: “The contractors were working seven days a week during the majority of the specified period. This consisted of a day and a night shift as required.
“The schedule will vary dependent on the stage of the works and restrictions that are in place around times that noisy works can take place.”
“Since these issues were encountered, we have been working at pace alongside ESW and Costain (our principal contractor) to finalise a revised integrated programme for the works.
“This delay was a result of unforeseeable complications, including the complex interdependencies between the water main and flyover works, highly challenging ground conditions and the discovery of two uncharted gas mains, which both projects are required to work around.”
