capital premium for Tier IV (fault-tolerant) over Tier III (concurrently maintainable) — construction + fit-out
~25–40% facilityestimate
| Value kind | estimate — Interpret this value according to its displayed kind, scope, source, and as-of date. |
|---|---|
| Scope | Secondary-source whole-facility planning estimate quoted by Savills in May 2024; no disclosed estimating population or method. No universal multiplier follows from Uptime Tier criteria. |
| Caveat | Single-source planning heuristic: Savills (May 2024) attributes it to Dgtl Infra, which publishes no sample, geography, density or estimating method. The older ~10–25% inverts a McKinsey 2011 statement (10–20% saving moving Tier IV→III). Uptime Tiers are outcome-based, so no universal cost multiplier follows from the standard; re-estimate against the actual design. |
| As of | 2024-05 |
| Source | Savills Research, European Data Centres, May 2024; publisher report. Quoted secondary estimate; not measured project evidence. · Costs On The Rise, printed page 22 (PDF page 11), 25% to 40% attributed to Dgtl Infra. |
| Review | checking…review by 2026-11-01 · standard cadence |
| Recorded changes | last 2026-09-16 · 12 revisions tracked |
| Claim id | capital-premium-for-tier-iv-fault-tolerant-over |
Where the guide uses it
- 0.3 Vocabulary, Mental Models & the Metric Stack
- 0.5 Reliability, Redundancy & Availability: The Design-Basis Primer
- 1.7 The Requirements-and-Consequences Matrix
- 12.1 Resilience Standards, Redundancy Topologies & Fault-Domain Engineering
- 12.2 The AI-Cluster Reliability Rethink: Goodput vs Facility Availability
- 13.1 Commissioning Fundamentals, Levels & Program Governance
- C Decision Tables & Calculators
← Full numbers register — every date-stamped figure in the guide, with revision history.