Overview
ISO 11863:2011 - Buildings and building‑related facilities - Functional and user requirements and performance - Tools for assessment and comparison - provides a structured method to define, measure and compare functional performance requirements (demand) and the capability (supply) of buildings and related facilities. The standard specifies how to set levels of demand and supply, determine relative importance, establish threshold (critical) levels, and evaluate gaps between required and provided performance. It is applicable to any asset scale - from a single component to a multi‑site portfolio - and across the whole life of an asset.
Key topics and technical requirements
- Demand and supply scales: Use calibrated demand scales to state required levels of functionality and supply scales to record levels of serviceability (capability). Each scale contains discrete, calibrated statements from “no requirement” (level 0) to the highest requirement.
- Levels and profiles: Define levels of functionality, levels of serviceability and assemble them into profiles (required vs provided) for topics, systems or whole assets.
- Relative importance and thresholds: Assign relative importance to topics and identify threshold/critical levels where failure to meet a level would significantly impair users’ operations.
- Calibration and normalization: Calibrate scales to ensure consistent intervals and enable meaningful comparisons and replicable ratings.
- Gap analysis and comparison: Evaluate the gap between demand and supply, and assess the significance of differences for decision‑making (maintenance, retrofit, procurement).
- Special topics: Guidance on complex topics with multiple functions, cultural applicability, consistency of responses, and integration across the whole life of a facility.
- BIM integration: The standard explicitly addresses inclusion in Building Information Modelling (BIM) workflows for assessment and documentation.
Applications (practical value)
- Asset and portfolio benchmarking and comparison across sites and asset types
- Pre‑design requirement setting and validation of design against stakeholder needs
- Condition surveys, performance audits and gap analysis for maintenance or retrofit prioritization
- Procurement and tender evaluation: comparing candidate designs or products against standardized demand scales
- Supporting whole‑life planning and service life assessment by linking functional requirements to serviceability over time
Who should use ISO 11863:2011
- Building owners, facility managers and asset portfolio managers
- Architects, designers and engineers validating design performance
- Occupants, tenants and stakeholder groups contributing requirement profiles
- Surveyors, auditors and asset analysts conducting performance assessments
- Clients and procuring authorities seeking consistent comparison criteria
Related standards
- ISO 6707‑1 - Building and civil engineering - Vocabulary (general terms) - normative reference for definitions
- ISO 15686‑10 - Service life planning - When to assess functional performance - referenced for timing of assessments
ISO 11863:2011 is a practical tool for consistent, repeatable assessment and comparison of building functionality and serviceability, enabling transparent decisions across design, operation and whole‑life asset management.