Tesco PLC and J Sainsbury PLC are benefiting from a marked deceleration in store expansion by discount rivals Aldi and Lidl, according to recent analysis from UBS. The investment bank described the current trading environment as supportive for the established supermarket operators, with discounter growth rates falling to multi-year lows.
Data from the UBS Evidence Lab, which employs geospatial analysis techniques, indicates that industry-wide retail space growth is currently running at approximately 1.0%. This represents a substantial decline from the pre-pandemic average of 2.6%, suggesting a broader slowdown in physical retail expansion across the sector.
The expansion pace of discount operators has notably moderated. Lidl recorded space growth of 1.7% during the third quarter of 2025, whilst Aldi achieved 2.6% over the same period. Both figures represent multi-year lows for the respective retailers, marking a significant shift from the aggressive growth strategies that characterised previous years.
UBS analysts highlighted specific expansion plans that underscore this slower trajectory. Aldi has announced intentions to open 80 stores over a two-year period, whilst Lidl recently secured financing for 17 new UK locations. Both plans fall below the historical average rate of store openings for these operators, suggesting a more cautious approach to physical expansion.
The research note identified increasing network cannibalisation as a constraint on further discounter growth. Aldi’s store network now exhibits 87% cannibalisation, with Lidl’s reaching 85%. These elevated levels indicate that new store openings are increasingly drawing sales from existing locations rather than capturing genuinely incremental market share, thereby reducing the economic attractiveness of additional expansion.
Meanwhile, the incumbent supermarket chains appear to be strengthening their competitive position. Both Tesco and Sainsbury’s have maintained or improved key consumer satisfaction metrics, according to UBS. The expansion of Aldi price-match schemes has played a role in this performance, with Tesco now covering approximately 650 items and Sainsbury’s extending the programme to around 800 products. These initiatives appear to be supporting customer retention and satisfaction levels.
UBS also noted that structural developments in online retail could present additional headwinds for the discount operators. The discounters have historically relied on low-cost physical store formats, and any acceleration in the shift towards online grocery shopping may disproportionately favour established players with more developed digital infrastructure.
The analysis suggests that the competitive landscape in UK grocery retail may be entering a new phase. After years of intense pressure from rapidly expanding discounters, the traditional supermarket operators appear to have gained some respite. Whether this proves a temporary pause or a more lasting shift in market dynamics will depend on how the discounters respond to their slowing growth rates and whether Tesco and Sainsbury’s can capitalise on the more favourable environment.
