Reducing child exposure to secondhand smoke (SHS) is a public health priority in Scotland, posing a particular challenge for children in disadvantaged homes. This study will examine home smoking restrictions in disadvantaged communities during children’s first 18 months. Research suggests restrictions ease as babies develop and become mobile, yet no study has identified the timing or reasons for such changes, making developing and delivering effective interventions challenging. NHS Lothian has invested in protecting children from SHS and would greatly benefit from the information on barriers and levers to creating smokefree homes this study contributes. Findings will be discussed with key stakeholders to help develop effective interventions to create smokefree homes for young children in disadvantaged households throughout Scotland.