Aim: This study analysed the impact that COVID-19 and the response measures implemented by the Spanish Government have had on families of individuals with intellectual and developmental disabilities. Method: Data on 323 family members (M = 52.3 years old; SD = 10.5) were collected through an online survey, which was focused on analysing difficulties experienced and service provision during lockdown. Results: Many families (66.3%) have seen their level of stress increased during lockdown because of, among other reasons, a greater burden of care. Difficulties were associated with the closure and changes in disability-related services. Families of people with extensive support needs have generally experienced greater difficulties. Conclusion: Support services should have been considered essential services during lockdown. The failure to receive support has resulted in excessive burden on families, who had to assume a multitude of roles to support their family member with intellectual and developmental disability.