PURPOSE: to measure noise levels and investigate the perception of nursing professionals and users' health at a reference high-risk pregnancy maternity hospital in the city of Curitiba-PR. METHODS: crosscut, quantitative study, held at a public hospital rooming-in, where 19 professionals and 77 users' perception was collected by means of interviews, while noise was assessed through an Integrating Bruel and Kjaer 2230 Meter, compensation A calibrated. RESULTS: noise levels in all areas of the rooming-in are above the recommended in literature. (35 a 45 dB(A) to the hospital). The higher levels were 67,7dB(A) at the nursing station and 65,3 dB(A) at the visitors' room. Users and nursing professionals are exposed to nose sources from health team's work process, users and health team's behavior, and maternity external noise. Strategies to minimize noise levels and enhance rooming-in ambience are related to actions of the health team's work process, comfort and management. CONCLUSION: noise levels in the rooming-in are above the recommended. Nursing professionals perceive more external noise, while users perceive more internal noise. It was evidenced that high noise levels interfere with the rooming-in ambience and affect daily activities.