Introduction – Uncontrolled asthma is common in children and is associated with a decline in lung function. Repeated personalised assessments of the reasons for inadequate control should including evaluations of the patients’ surroundings. This can be support by Indoor Environmental Advisors (IEAs). This cohort study aimed to assess the impact on asthma control of routine assessment of children’s home by IEAs. Methods – Children aged 4 to 18 years who had asthma severity grades of 3 to 5 according to Global Initiative for Asthma guidelines were enrolled. Asthma control was evaluated using the standardized Asthma Control Test (ACT) before and 3 months after the IEA visit. Results – We enrolled 15 children with moderate-to-severe asthma. Asthma control improved significantly after the IEA visit (p=0.004). The percentage of children with uncontrolled asthma decreased from 64.3% before IEA visit to 27.3% at 3 months, and none of the patients had 2 exacerbations or more within the 3 months after the visit. IEA identified environmental issues whose remediation could likely contribute to improve asthma control. However, there are still barriers to the implementation of IEA that would be beneficial to remove. Conclusion – Our results support the inclusion of IEA interventions as part of the standard care pathway for children with asthma.