Crews rushed to the Cartridge World shop in George Place, Bathgate, following a call received shortly after 9am this morning.
The blaze was tackled by dozens of fighters using hose and breathing apparatus.
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Hide AdRoad closures were put in place, at Glasgow Road and the junction of Whitburn Road and the Fairway hotel.
Firefighters - who were joined at the scene by senior officers - described the building was “well alight”. At around 10.50am, crews managed to gain access to the store’s roof space, which was checked for fire spread.
Staff in a neighbouring property were also evacuated, but it is understood they have been allowed to re-enter.
There were no reports of casualties.