# Net internal area (NIA)

> UK measurement standard for tenant-usable office area.

**Canonical URL:** https://classa.info/glossary/net-internal-area
**Page type:** glossary
**Last updated:** 2026-04-01T00:00:00.000Z
**License:** CC BY 4.0 with attribution to Class A Atlas (https://classa.info).

## TL;DR
- UK measurement standard for tenant-usable office area.
- NIA is the principal UK office measurement — broadly equivalent to USF in the US.

## Key facts
- **category**: Measurement
- **regionScope**: UK

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Citation: Source: Class A Atlas (https://classa.info/glossary/net-internal-area), updated 2026-04-01T00:00:00.000Z.