The client calls: "We have an injection-moulding line from 2014. The customer (Tier 1 automotive) wants to double volumes. Do we build new or refit the old one?" This is a decision made in millions of euros and the firm carries the consequences 7–12 years. And it's a decision where "it depends on the situation," while true, is absolutely unusable as an answer.
This article is the decision framework we've applied to ~30 projects in the €0.8–8M CAPEX range over the last 5 years. Five criteria, five concrete numbers — the output is indicative but in 80% of cases gives the client the right answer by the first workshop.
What's hidden behind "refit or greenfield?"
First: what does this actually mean?
Refit (retool, modernisation) — existing line, existing layout, existing buildings + infrastructure. Replace part: key machines (extruder, press, robot), automation (PLC + SCADA + safety), some auxiliary systems. Don't change: building, main media (electrical 1MV / 6kV transformer, water, gas), in 80% of cases not even the layout.
Pretooling (mid-life upgrade) — bigger than refit, smaller than greenfield. A significant share of equipment changes (50–70%), but the layout + building + main media stay. Often part of ramp-up to higher volumes.
Greenfield — a new line on a new plot or in a new hall. Everything from foundations: building, media, equipment, automation, IT/OT.
Brownfield — a new line in an existing hall (after demolition of the old one). Hybrid — uses existing buildings + some media (typically MV grid connection), the rest new.
Clients use these terms interchangeably. The first workshop call: define clearly what we're talking about.
Five criteria — decision tree
Criterion 1 — Installed-base value (what the existing line is actually worth)
Not book value (where the asset has 30% remaining amortisation but is technically worthless). The actually usable value in the new arrangement.
Three layers evaluated separately:
A) Building structures: hall, heating, layout, access. Value: if the hall is 15+ years old and building standards were 2008, a reassessment for the current code is needed (fire protection, evacuation, OHS planning). Often: 70–90% of value.
B) Main media: electrical (transformer, main switchboards), air (compressors, distribution), water (cooling tower, deionised water plant), gas (natural gas distribution), waste (waste water treatment). Value: if < 12 years, sized for the new volumes, 80–95% usable. If over-committed (needs upgrade for 2× volumes), either upgrade or refit isn't enough.
C) Equipment (machines): press, extruder, robot, conveyor. Value: drops rapidly with age + technological obsolescence. A 5-year Engel injection-moulding press has 60–70% of its original value. A 10-year-old has 30–40%. A 15+ year-old is "either working or for scrap."
Rule: if A + B sum ≥ 50% of total project CAPEX, refit/pretooling is mathematically more favourable. Below 30%, greenfield.
Criterion 2 — Downtime cost during refit
This is the line item that most often kills the refit business case. Refit means production loss — 2–12 weeks depending on scope. Greenfield within existing operations means zero loss (parallel build, switchover after commissioning).
Calculation:
Downtime_cost = (lost annual production) × (margin per product) × (months of refit / 12)A concrete example — injection moulding for automotive interior trim: - Annual production: 4.2M units - Margin per unit: €1.80 - Refit length: 10 weeks = 2.5 months - Downtime cost: 4.2M × €1.80 × (2.5/12) = €1.575M
This is an opportunity cost that's added to the refit CAPEX. Greenfield with parallel ramp-up doesn't have this cost (but has higher CAPEX). Compare:
- Refit: €1.8M CAPEX + €1.575M downtime = €3.375M total
- Greenfield: €3.2M CAPEX + €0M downtime = €3.2M total
Here greenfield wins. This is where the client most often goes wrong — they compare CAPEX vs CAPEX and ignore opportunity cost.
Exceptions: - The client has two redundant plants / lines → the downtime of one can be shifted to the other → opportunity cost drops to 0–30% - Refit is done during a shut-down period (summer break, Christmas) → real opportunity cost drops to 20–40% - Customer accepts inventory buy-ahead → 4–8 weeks of production is pushed to stock before refit → opportunity cost drops to 40–60%
Criterion 3 — Regulatory upgrades triggered by the refit
For refits in the EU: if a modification of equipment exceeds the substantial change threshold, a new CE marking under Machinery Directive 2006/42/EC (or the new Machinery Regulation EU 2023/1230, effective 2027-01) is required.
Substantial change criteria (EU Blue Guide 2022): - Adding a new function or mode - Change of risk profile (new mechanical / electrical / chemical hazard) - Change of performance characteristics by > 20% (speed, force, temperature) - Substantial replacement of equipment (> 30% of components)
If the refit crosses the threshold, you need: - New Risk Assessment (EN ISO 12100) - New Safety Validation under EN ISO 13849-1 (PL category) or IEC 62061 (SIL) - New EC Declaration of Conformity - New technical documentation (technical file) - Re-validation training for operators
Real cost of recertification: €40–120k per machine, €15–35k for testing and documentation, €8–20k for training. For a whole line with 4–8 machines: €200–600k.
This is always underestimated in the initial refit budget. For greenfield this is already counted in the base CAPEX.
Criterion 4 — Physical footprint changes
A refit works if the new line fits into the original footprint. As soon as internal walls have to move, media have to reroute, utilities have to relocate, the refit price climbs exponentially.
Triggers that destroy the refit business case: - Capacity uplift > 50% → need for another machine → need for more footprint - Adding a new process (e.g. surface coating to a moulding line) → another environment, more media - Compliance upgrade (e.g. cleanroom requirement, ATEX zone reclassification) → rebuild a building element
Rule: if the refit needs construction work over €150k (new floor layers, internal walls, ventilation, fire suppression), greenfield is probably worthwhile. Construction work in an existing hall with running production costs 2–3× more than in a greenfield environment (extra protection, working hours outside production, multiple mobilisations).
Criterion 5 — Workforce reskilling cost
This aspect is always underestimated. A refit with a new PLC, new HMI, new robotic cell means retraining the existing team. Greenfield usually offers the option of hiring new people with the right skill set from the start.
Real reskilling cost per technician: - Operator reskill (HMI faceplate, basic recipe management): €1,500–3,000 + 80 h productivity loss - Maintenance reskill (PLC troubleshooting, safety system, motion control): €4,000–12,000 + 160 h productivity loss - Process engineer reskill (recipe optimisation, statistical process control, MES integration): €8,000–25,000 + 240 h productivity loss
For a plant with 12 operators + 5 technicians + 2 engineers: total reskill cost €150–280k. Plus 6–12 months until the reskilled team reaches pre-refit productivity.
Greenfield: doesn't need to reskill the existing team (it can stay on the existing line), the new team is hired with the requested skill set. Cost: hire + onboard 12 new people ~€80–120k + 3–4 months of ramp-up.
In some cases (existing team has high loyalty, low turnover, unique process knowledge) reskilling is an INVESTMENT, not a cost. In others (high turnover, burned-out team, unwillingness to change) reskilling is practically infeasible and the refit fails for operational reasons.
A real example — an injection moulding refit that won
Client: interior trim supplier for Volkswagen SK. Line from 2014, two Engel duo presses 500T + 800T, manual loading, OEE 71%. The customer wants to double volumes in 2027 — capacity uplift 60%.
- Refit: robot cell loading, Cognex visual inspection, Engel press refurbish, new Siemens S7-1500 + WinCC. CAPEX €1.8M, downtime 8 weeks split 4+4 (one line ran while the other was being refitted).
- Greenfield: two new Engel e-motion lines in a parallel hall. CAPEX €3.2M, downtime 0.
Applying the 5 criteria:
- 1.Installed-base value: hall 11 years old, MV transformer over-sized to 2.5× current load, equipment valuation €380k. Reusable €1.78M = 56% of refit CAPEX. Refit favoured.
- 2.Downtime cost: 0.95M units × €1.80 margin × (4/12) = €570k added to refit.
- 3.Regulatory: refit crosses the substantial change threshold → recertification €120k.
- 4.Footprint: new cells fit into the existing dimensions with margin. Construction work < €40k.
- 5.Reskilling: 18 operators + 4 technicians × €5,200 average = €94k + 6 months ramp-up.
Final: Refit €1.8M + €570k + €120k + €94k = €2.584M. Greenfield €3.2M + €120k hire/onboard = €3.32M. Refit won by €736k.
The real driver: the line fitted into the original footprint, infrastructure was over-sized, the team was strong and willing to reskill. Without any of these three factors the arithmetic would have flipped. Post-implementation (2026-Q1): the line is running, OEE 84% after 4 months of ramp-up.
When refit loses
Five situations where a refit business case fails:
- 1.Hall / infrastructure is end-of-life (25+ year structure, undersized electricals) — refit becomes "upgrade halfway, not enough."
- 2.Compliance landscape has shifted (Machinery Regulation 2027, AI Act 2026-08) — on refit it all triggers; on greenfield the process is upfront-by-design.
- 3.Workforce isn't willing to reskill — high average age, low engagement, history of failed change. Refit drags on and doesn't reach planned OEE.
- 4.Customer demands a fundamentally different product — different materials, different process. Existing machines can't adapt.
- 5.Volume uplift > 100% — refit can add 30–60% capacity through OEE + de-bottlenecking. Above 100% another line is needed.
A practical playbook — first workshop
About 2 weeks of work, €8–15k of consulting: (1) inventory of the existing line + valuation, (2) customer demand analysis, (3) workshop on the 5 criteria with quantification, (4) preliminary CAPEX estimate for both variants, (5) site survey + media audit for the refit variant, (6) detailed CAPEX + opportunity cost calculation, (7) final decision workshop with management. Output: a defendable decision with 80%+ accuracy against final CAPEX.
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*We run refit / greenfield decision workshops for production sites in SR/CZ/AT. The first consultation (90 min) walks through the 5 criteria on your specific project and gives you indicative CAPEX ranges for both variants before you commit to one or the other.*