During COVID-19 lockdowns in England, 'key workers' including factory workers, carers and cleaners had to continue to travel to workplaces. Those in key worker jobs were often from more marginalised communities, including migrant workers in precarious employment. Recognising space as materially and socially produced, this qualitative study explores migrant workers' experiences of navigating COVID-19 risks at work and its impacts on their home spaces. Migrant workers in precarious employment often described workplace COVID-19 protection measures as inadequate. They experienced work space COVID-19 risks as extending far beyond physical work boundaries. They developed their own protection measures to try to avoid infection and to keep the virus away from family members. Their protection measures included disinfecting uniforms, restricting leisure activities and physically separating themselves from their families. Inadequate workplace COVID-19 protection measures limited workers' ability to reduce risks. In future outbreaks, support for workers in precarious jobs should include free testing, paid sick leave and accommodation to allow for self-isolation to help reduce risks to workers' families. Work environments should not be viewed as discrete risk spaces when planning response measures; responses and risk reduction approaches must also take into account impacts on workers' lives beyond the workplace.