---
title: "Cat B — Class A Atlas glossary"
description: "Tenant-funded interior fit-out — partitions, finishes, furniture, AV."
canonical: https://classa.info/glossary/cat-b
pageType: glossary
lastUpdated: 2026-04-01T00:00:00.000Z
license: "CC BY 4.0 with attribution to Class A Atlas (https://classa.info)."
---

> Tenant-funded interior fit-out — partitions, finishes, furniture, AV.

## TL;DR

- Tenant-funded interior fit-out — partitions, finishes, furniture, AV.
- Cat B is the tenant's interior build — workplace strategy, partitions, finishes, joinery, AV, security, and furniture.

# Cat B

*Construction · UK*

## Short definition

Tenant-funded interior [fit-out](/topics/fit-out-capex)">fit-out — partitions, finishes, furniture, AV.

## Full definition

Cat B is the tenant's interior build — [workplace strategy](/glossary/workplace-strategy), partitions, finishes, joinery, AV, security, and furniture. Per-sqft Cat B budgets in 2026 range from £80 (basic) to £400+ (trophy) in London [Class A](/glossary/class-a).

## Why this matters for Class A leasing

Cat B is part of the construction vocabulary that institutional Class A occupiers, landlords, and advisers use across UK markets. Understanding it correctly affects how you read lease documents, model occupancy economics, and benchmark deal terms across cities. Class A Atlas tracks the UK definition alongside the global standard so [cross-border](/topics/cross-border-expansion) occupiers can translate quickly.

## See also

- [Cat A](/glossary/cat-a)
- [Fit-out](/glossary/fit-out)
- [Tenant improvement allowance (TI / TIA)](/glossary/tenant-improvement-allowance)

## Related guides

- [Fit-out budgeting: a five-tier framework](/guides/fit-out-budgeting-the-five-tier-framework)

---

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