Transformation meter for offices: A tool to assess opportunities and risks of adaptive reuse

The “Transformation meter for offices: A tool to assess opportunities and risks of adaptive reuse” is an academic paper authored by R. P. Geraedts, D. J. M. van der Voordt and L. Espinal, published by BookRxiv in 2025. The work originates from TU Delft researchers, with Geraedts (1951‑2023) honoured posthumously. It presents a systematic checklist‑based instrument designed to evaluate the feasibility of converting vacant office buildings into residential units across Europe, aiming to address high office vacancy rates and growing housing demand.

The tool targets the European context, analysing market, location, building and organisational factors that influence adaptive reuse. It is intended for owners, developers, municipalities and investors seeking data‑driven decisions on whether to pursue a “go” or “no‑go” pathway for office‑to‑housing projects.

• Office vacancy rates are monitored through national sources such as the Dutch Vacancy Monitor (CBS).
• Typical building sizes examined range around 48,317 m² (e.g., the Alexandrov 125 case) with potential for hundreds of residential units.
• Average Dutch house prices (2024) vary from €2,000 / m² in the north to €7,187 / m² in Amsterdam, with an overall average of €460,000 per dwelling.
• Rental markets show student room rents between €375 and €700 per month, average €420, while private sector rents for studios can exceed €2,500 per month in Amsterdam.

The methodology comprises five sequential steps:

1. Inventory – identification of vacant offices.
2. Quick veto scan – nine veto criteria (e.g., zoning permission, health risks, ceiling height > 2.60 m). Failure on any criterion leads to immediate exclusion.
3. Financial feasibility – key‑figure analysis of acquisition (≈ €250‑€1,500 / m²) versus renovation costs (€212‑€1,900 / m²). A capitalised rental value > €4,000 / m² is considered viable.
4. Gradual criteria assessment – detailed location (21 criteria) and building (28 criteria) checklists, weighted (location × 5, building × 3).
5. Risk inventory – market, location and building risk categories with mitigation suggestions.

Weighted scores range from 0 to 189. Classification thresholds:

• < 60 → Class 1 (Not transformable)
• 61‑90 → Class 2 (Hardly transformable)
• 91‑120 → Class 3 (Limitedly transformable)
• 121‑160 → Class 4 (Transformable)

• 160 → Class 5 (Very well transformable) Example: a building scoring 15 location positives and 18 building positives yields 129 points, placing it in Class 4.

• Alexandrov 125, The Hague: scored 135 (Class 4). Energy label G, large floor area, recent asbestos removal and upgraded services make conversion attractive despite high purchase price.
• Campus Diemen Zuid: transformed 936 units by adding amenities (supermarket, gym) and improving transport links, illustrating the impact of supplemental services on feasibility.
• Typical risks include insufficient parking, noise pollution, heritage constraints and high renovation costs; mitigation involves parking optimisation, sound insulation, heritage consultations and mixed‑use strategies.

The meter aligns with European sustainability goals by promoting reuse of existing structures, reducing demolition waste and leveraging underused office stock to meet housing shortages. Financial analyses show that renovation costs often exceed acquisition costs (average cost ratio ≈ 2:1), underscoring the need for careful economic planning and potential subsidies. The tool’s modular weighting allows adaptation to local policy priorities, making it a versatile resource for pan‑European stakeholders seeking evidence‑based pathways to greener urban development.