AI investment pushes London fit-out costs into the world's top two

The figures from Turner & Townsend are alongside CoStar leasing data showing that AI companies took more than 450,000 sq ft of London office space in April 2026, compared with a monthly average of 40,000 sq ft across 2025. This shift in the market is being seen as a gradual change rather than a blip.

What the survey shows

T&T’s “Global Office Fit-Out Cost Guide” puts London in second place for the cost of delivering high-grade office space. The guide identifies AI-driven climate control and lighting systems as a specific contributor, alongside broader pressures on labour and materials.

This data frames the demand as international competition for talent and investment: occupiers across financial services, professional services, legal, and the larger technology firms are all looking for top-quality space at a moment when stock is running short.

JLL's parallel 2026 fit-out guide fleshes out the story even more. Copper prices are up 26-30% year-on-year, feeding directly into cabling, switchgear, transformers, and HVAC. Semiconductor shortages are pushing up the price of smart building controls, VRF air conditioning, BMS equipment, and electrical switchgear. The same components that a financial services tenant might have specified in 2023 are now both harder to source and materially more expensive.

What this means for AI Growth Zones

The government's AI Growth Zone programme asks public sector property teams to bring AI-ready space forward at pace, in locations including South Wales, Northeast England, and parts of the Midlands. This market context changes the cost of delivering "AI-ready" spaces, which is also compounded by the specifications of each element still in flux.

This is the gap that consultancy can fill. The technical detail of AI-ready specifications, the cost intelligence to scrutinise contractor pricing, and the delivery of the procurement strategy do not sit naturally within estate managers’ remits.

What to watch for next

The next quarter's leasing data will show whether April's volumes hold, decrease, or accelerate further. The more useful indicator will be where outside London this pattern repeats. AI Growth Zone locations should see a second wave; whether they do, and on what timetable, will tell the property market more than any survey.

If you would like to discuss AI Growth Zone delivery, fit-out cost intelligence, or any of our service lines, complete the form below, and a member of the BTG Eddisons team will be in touch.