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To examine inter-rater, intra-rater and test-re-test reliability of the Community Balance and Mobility Scale (CBM) and compare reliability in live vs videotape rating contexts for children with acquired brain injury (ABI).Repeated measures design.Seven physiotherapists (PTs) were trained as assessors. The primary assessor administered and scored baseline CBM while the second assessor observed and scored independently (inter-rater reliability). Re-assessment occurred 3-10 days later by primary assessor (test-re-test reliability). Assessments were videotaped.There were 32 participants with ABI (mean age = 14 years 1 month (SD = 2 years 1 month)). Baseline mean scores were 67.4% (18.2) and 66.7% (18.3) for primary and second assessor, respectively. Primary assessors' re-test mean score was 69.3%. Inter-rater reliability ICC was 0.93 (95% confidence interval (CI) = 0.87-0.97). Test-re-test ICC was 0.90 (95%CI = 0.81-0.95) and Bland-Altman plot indicated greatest test-re-test differences for mid-range CBM scores. Minimum detectable change (MDC₉₀) was 13.5% points.The CBM showed excellent reliability in youth. Reliability was comparable for live and videotape rating approaches, meaning that the easier and less expensive live-rating can be recommended. Future work should focus on evaluation of responsiveness to change in rehabilitation centre and community intervention contexts.