Adding a Floor to a 1965 Office Building with One Stair
In Ramat Gan, a 1965 four-storey office building has 3,200 m² gross floor area, one 1.10 m wide enclosed stair, one 8-person elevator, and no sprinkler system. The owner wants to add a 600 m² fifth floor and renovate all floors. The building is fully occupied during works. The local fire authority has commented that the single stair and the 38 m travel distance from the far corner office do not meet current requirements for a new building. The owner argues that the building was lawful when built and that the existing floors should be grandfathered. The architect proposes a new external stair at the rear, but the plot is only 1.5 m from the rear boundary and the neighbour objects. The project is due for occupancy certificate (Tofes 4) in eight months.
1. Explain how to frame the fire-safety strategy: what triggers upgrade obligations, and what compensatory measures are likely to be accepted if a second stair is impossible.
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The addition of a fifth floor plus a renovation of the whole building is not a purely existing-building situation. The new floor must comply with current fire-safety requirements, and the committee and fire authority will examine whether the existing single stair can serve the enlarged building. Grandfathering is not automatic: it may protect an unaltered existing element, but it does not entitle the owner to add floor area and occupants without upgrading the means of escape. Start with a fire-safety concept prepared by a qualified fire consultant: occupant load, travel distance, stair width, protected lobby, compartmentation, detection, and smoke control. If a second stair is physically impossible, the likely compensatory package is a full sprinkler system, automatic detection, fire-rated compartmentation, protected stair with positive pressure or smoke control, reduced travel distance by re-planning the floor, and a managed evacuation plan with evacuation chairs. The fire authority may accept a performance-based alternative only if it is documented and does not rely on the fire service for rescue. The external stair at 1.5 m from the boundary is unlikely to satisfy protection from fire exposure without a fire-rated wall and consent from the neighbour; test that option early rather than designing around it.
2. Address accessibility: the elevator, entrance, and sanitary facilities. What must be upgraded, and how does the 8-person elevator affect the solution?
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The new floor and the renovation trigger accessibility obligations under SI 1918. The entrance must have a level or ramped accessible route, and the ground-floor lobby must lead to an accessible elevator. An 8-person elevator is often too small for a stretcher and does not provide the clear car dimensions and door width needed for a fully accessible route; the architect must measure the car and door and compare them with the standard. If the existing shaft cannot take a compliant car, options include enlarging the shaft, installing a new accessible elevator, or, only as a last resort, a platform lift where the standard permits it. Accessible sanitary facilities must be provided on each relevant floor, with correct turning circles, grab bars, and door clearances. The fire strategy and accessibility strategy must be coordinated: a refuge area or evacuation chair cannot be placed in a way that blocks the accessible route. Before Tofes 4, the architect should prepare an accessibility checklist, obtain the accessibility consultant's confirmation, and ensure the works are complete, not promised.
3. The owner asks you to sign the completion certificate before the external stair is built, promising to finish it later. What do you do?
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Do not sign. The Tofes 4 confirms that the building is fit for occupancy and complies with the permit and the conditions attached to it. If the external stair is part of the approved fire strategy, signing before it exists is a false certification and exposes the architect to criminal, civil, and disciplinary liability, as well as endangering occupants. Explain to the owner that a partial occupancy certificate may be possible only if the fire authority agrees to a phased strategy with temporary measures, and that this must be approved in advance, not regularised afterwards. Put your refusal in writing, list the outstanding items, and require a reinspection. If the owner pressures you, copy the client's instruction and your response to the project file and seek advice from your professional insurer or legal counsel. The architect's signature is not a commercial favour; it is a regulatory act that depends on verified facts.