The mobility of a hemiplegic patient is an interaction between their functional ability and external factors. The "Life Space Assessment" (LSA) questionnaire is a tool that assesses their mobility on 5 levels. Objective: To validate the LSA in a population of stroke survivors in physical therapy at a rehabilitation center, correlating it with measures of physical performance. Method: Instruments used in concurrent validation: Timed Up and Go Test (TUG), Postural Assessment Scale (PASS), Rivermead Mobility Index. Statistics: Descriptive, Spearman Index and Intra Class Correlation (ICC). Results: Thirty hemiplegic patients were assessed (73% male, mean age 58.6 years, mean time since injury 1.9 years). The LSA correlated significantly (p < 0.01) with age, TUG, PASS, and Rivermead. Inter-rater agreement: ICC 0.941 Intra-rater agreement 0.981. Conclusion: The LSA was valid in a population of chronic stroke survivors, with excellent intra and inter-rater correlation measures, correlating significantly with measurements of body structure, function, and motor activities (TUG, PASS, and Rivermead).