The object of research is multi-storey residential building made of steel modular units. The purpose of this work is to develop constructive and architectural solutions for residential multi-storey steel modular building considering fire safety requirements. Method. Space-planning solutions are developed using Autodesk Revit software for 3D modeling. Structural solutions are developed using Tekla Structures software. LIRA 10 and IDEA StatiCa software is used for structural analysis. Smoke propagation is modeled using Sigma FS software that applicates methods of computational fluid dynamics (CFD). Results. Architectural (layouts, facades, types of blocks) and structural solutions (sections of load-bearing elements, types of frames, block junctions) for a building made of steel modular structures were developed. The results obtained can be used as initial parameters in the design of modular buildings. Fire safety features of modular building were also considered. The escape route blocking time is in the range of 54-18 seconds for a gap size of 1-30 mm respectively. The smoke detector response time is in the range of 47-28 seconds for a gap size of 1-30 mm respectively. Poor-quality installation of fire barriers is critical – even a very small gap leads to a quick blocking of the evacuation route (the time for evacuating people from a floor is 30 seconds). Installation of fire barriers should compensate defects during the installation of blocks and provide complete sealing of intermodular cavities. The results of calculating the response time of the detector can be used to calculate the start time of the evacuation.