Class 5 Building
Overview
This article explains what Class 5 buildings are under the National Construction Code (NCC) and describes when certain professional premises may instead be classified as Class 9a health-care buildings.
Why This Is Important
- Ensures correct building classification for compliance.
- Helps identify when a building is Class 5 versus other classifications like Class 9a.
- Avoids design and approval delays caused by misclassification.
What Are Class 5 Buildings?
- Class 5 buildings are office buildings used for professional or commercial purposes.
- They do not include Class 6, 7, 8, or 9 buildings.
Examples of Class 5 Buildings
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Offices for:
- Lawyers
- Accountants
- General medical practitioners
- Government agencies
- Architects
Special Consideration: Medical Practices
- Generally, a general medical practitioner’s office is classified as a Class 5 building.
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Exception:
- If medical treatment administered leaves patients unconscious or non-ambulatory, the building becomes a health-care building (Class 9a) (e.g., a hospital).
Tips, Best Practices & Troubleshooting
- Confirm the type of professional services delivered before classifying.
- If unsure whether treatment affects a patient’s consciousness or mobility, consult the NCC definitions for health-care buildings.
- Document classification decisions in the project file.
Related Resources
Class 10 Buildings or Structures
Request Engineering (Site Check)
Review & Updates
Version History:
- v1.0 – 03 September 2019
- v2.0 – 31 July 2025
Article Information
- Category: Engineering & Site Specifications
- Target Audience: Franchise Users, Estimators, Sales Coordinators
- Business Owner:
- Version: v2.0
- Last Reviewed: 31 July 2025