Office Refurbishment Cost London 2025 — CAT A to CAT B Fit-Out Guide

Office Refurbishment Costs in London 2025

London commercial fit-out costs vary significantly depending on the category of works and the specification. Here are genuine 2025 benchmarks from SuperBuilder's commercial division.

CAT A — Shell and Core (£35–£65/m²)

Basic fabric works only: raised access floors, suspended ceilings, basic lighting, HVAC distribution, and blank wall finishes. The building is made habitable but neutral — ready for a tenant to CAT B fit-out to their own specification. This is typically done by a landlord or developer.

CAT A+ (£60–£100/m²)

CAT A with basic furniture, meeting rooms, and breakout spaces added — increasingly popular for co-working and short-lease spaces where tenants want to move in immediately with minimal additional works.

CAT B — Occupier Fit-Out (£75–£150/m² and upward)

Full occupier fit-out to a specific business's requirements. Includes partitioning, meeting rooms, AV, data cabling (CAT 5e/6), bespoke joinery, kitchen and welfare facilities, branded finishes, specialist lighting, and acoustic treatment. This is what most businesses mean when they say "office refurbishment."

High-Specification CAT B (£150–£300/m²)

Premium-grade fit-out for professional services, financial services, or design-led businesses. Feature staircases, bespoke reception joinery, exposed concrete or Venetian plaster finishes, high-end carpet or engineered hardwood, full AV and VC integration.

Programme Timescales

A 500m² basic CAT B fit-out typically runs 10–14 weeks from appointment to handover. A 2,000m² premium fit-out: 20–28 weeks. SuperBuilder works directly with landlords, design and build contractors, and occupiers.

Contact us on 0800 530 0853 for a commercial enquiry.