Realistically any further expansion to the overall network will need an increase to the depot capacity. I think it’ll be incredibly difficult for any expansion to happen anytime soon.
Looking at expansions to the pure tram network in Sheffield (as opposed to tram-train suggestions like Barrow Hill, Don Valley or all the way to Doncaster and DSA), there are somewhat-realistic plans for a "Second City Crossing" similar to Manchester's project of the same name (
previous discussion here).
The council's
City Centre Access and Movement Plan, which was approved in December 2025, has this to say:
Support the development of a second Supertram route within the city centre that connects key growth areas and destinations, including Royal Hallamshire Hospital and Moorfoot.
This proposed loop will enhance the operational resilience of the network by ensuring that disruptions in the city centre do not impact the entire Supertram system.
It will also create opportunities for future extensions to additional destinations, subject to further study by SYMCA.
and includes this as
Figure 8: Supertram Second City Crossing search area
Likewise the
SYPN "Vision Doc" includes roughly the same alignment as a "Route under investigation" in the long-term map, although nothing specifically mentioned in the text.
Somewhat speculating at this stage, but it's fairly safe to guess this would involve extending the current line from West Street up Glossop Road to the RHH (which has been talked about for decades at this point), and then a line down either via the Inner Ring Road or Fitzwilliam Street to Moorfoot and then continuing to meet the current line somewhere south of the station.
There's a bit of a hint in
the outline proposals for the Moorfoot regeneration area, which shows a tram line passing through the centre along Cumberland Street and continuing east to the south of the IRR.
Notably the realistic plans quite deliberately doesn't show anything to the northwest, although the sketch drawing does show it connecting to Fitzwilliam Street.
Take it all with a grain of salt, especially the Moorfoot plans, but it's fairly clear that any expansion of the tram network is going to focus on these areas rather than entire new branches in the suburbs.