Residential-to-Clinic Conversion with a Single Stair in Isfahan
A four-storey residential building in Isfahan, built in 2001, is being converted into a private day clinic. Each floor is 300 m²; the total is 1,200 m². The building has one internal reinforced concrete stair 1.20 m wide, no elevator, a 1.0 m wide entrance door, and a 3.0 m wide street frontage with no off-street parking. The owner proposes to keep the single stair, convert the ground floor to a reception and imaging suite, and use the upper floors for examination rooms and a small operating room. The clinic expects 25 staff and up to 90 patients per day, with peak occupancy of 60 on the ground floor. The municipality has not yet approved the change of use, but the owner has asked the architect to sign the drawings so that construction can start immediately. The fire department has issued a preliminary note requiring a protected second means of escape for clinic floors, citing occupant load and travel distance. The architect must decide what to certify, what to redesign, and how to advise the client on approvals.
1. Identify the approvals and code reviews triggered by the change of use. What should the architect do before signing any drawing?
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The change from residential to clinic triggers a change-of-use permit, a fire-safety review, health-department licensing, and a fresh accessibility check. The architect should not sign the drawings before these approvals, because the seal certifies compliance with the approved use. I would prepare a code analysis under the national building code: occupant load per floor, egress width and travel distance, fire resistance of the floor and stair enclosure, compartmentation around the imaging suite and operating room, ventilation, medical gas, and accessible WC. The 1.0 m entrance door is below the clear width needed for a stretcher and for the calculated occupant load; the single 1.2 m stair may be adequate in width but not necessarily as the only means of escape. The 300 m² floor area is not itself decisive; the clinic's non-ambulatory patients and the travel distance are. The architect should request the fire department's preliminary note in writing, confirm the occupant load, and produce a code-compliance drawing set before signing anything.
2. Evaluate the single stair and egress strategy. If a second means of escape is required, propose a compliant concept.
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First calculate the occupant load: 60 on the ground floor and, say, 30 on each upper floor. A 1.2 m stair gives about 1,200 mm of width; at 5 mm per person that is capacity for 240 people, so width is not the problem. The problem is the single means of escape. If the fire department requires two independent exits, the existing stair cannot be the only one. I would add an external steel stair at the rear, 1.2 m wide, with two-hour separation from the building, protected landings, and direct discharge to the street; or enclose a second stair within the building if area permits. The ground-floor reception must have a clear escape route that does not pass through the imaging suite. The entrance door should be widened to 1.2 m clear. The operating room needs a separate protected route and a stretcher-sized door. If a second stair cannot be fitted, reduce the clinic to the ground floor only, or relocate to a building with two stairs.
3. The client wants to start construction immediately. What are the architect's professional responsibilities, and what should be documented?
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The architect must not sign drawings for a use that has not been approved, and must not let the client start construction on the basis of a preliminary sketch. The seal is a professional certification; signing early exposes the architect to disciplinary action and liability if a life-safety defect occurs. I would write to the client: the drawings are for preliminary review only, not for construction; no building permit has been issued; the fire department's note is unresolved. I would document the client's instruction to proceed, issue a formal refusal to certify, and notify the municipality if unauthorized work starts. The architect can offer a fast-track path: submit the change-of-use application, obtain the fire note, complete the code analysis, then sign a coordinated set. If the client insists on construction, the architect should withdraw from supervision rather than inspect non-compliant work, and should keep a written record of the withdrawal and the reasons.