Work is underway to clear the former site of Target Ford in Stafferton Way in Maidenhead ahead of building work to construct a Lidl supermarket and Lok'nStore storage facility.
The derelict garage has been demolished and workmen are preparing the land for the £4.5m project to bring the firms to Maidenhead.
A spokesman for Lidl said work was on track ready for an opening in spring or summer next year.
Planning permission for the development was granted in 2011.
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The Met Office has issued a yellow alert for Windsor and Maidenhead, Slough and Wokingham, warning that rain moving eastwards across the south of the country may turn to snow in some places.