Modular Data Centre Design:
Pre-Engineered vs Purpose-Built
for the Indian Market

India added more data centre capacity in 2024 than in the previous five years combined. The clients commissioning this capacity — hyperscalers, domestic cloud operators, financial institutions, and enterprise IT departments — share a common requirement: they need the capacity online as fast as possible. Construction timelines that were acceptable in a slower market have become commercial liabilities in an environment where AI workload demand is growing faster than traditional design-build programmes can deliver.

This commercial pressure has made modular data centre design a mainstream delivery model in India — no longer an edge case or temporary solution, but a legitimate alternative to purpose-built construction that requires rigorous engineering evaluation rather than reflexive preference for either approach. The answer to “modular or purpose-built?” is always context-dependent, and the contexts that favour each approach are well-defined. This article provides that framework.

Taxonomy: What “Modular” Actually Means

The term modular is applied to a wide spectrum of data centre delivery approaches. Understanding the specific type of modularity being proposed is the prerequisite for any meaningful evaluation.

The Timeline Case for Pre-Engineered Modular

The primary argument for modular pre-engineered data centres is schedule compression. In the Indian market, where land acquisition, statutory approvals, and construction labour coordination can each independently add months to a programme, the ability to move MEP procurement and factory assembly in parallel with civil construction is a significant commercial advantage.

// Delivery timeline comparison — 5 MW data centre, India

// PURPOSE-BUILT (conventional design-build)
Concept and brief         : Month 1–2
Detailed design            : Month 3–8    (6 months — MEP, structural, fire)
Statutory approvals        : Month 6–12   (overlapping; DISCOM, NBC, fire NOC)
Civil construction         : Month 10–20  (10 months — structure, finishes)
MEP procurement & install  : Month 16–26  (sequential after civil)
Commissioning & testing    : Month 25–30
Total                      : ~30 months  (25–36 months typical range)

// PRE-ENGINEERED MODULAR (Type 2 — pre-fab MEP in permanent building)
Concept and module selection: Month 1–2
Building design             : Month 2–5   (simplified — modules define space)
Statutory approvals         : Month 4–10  (overlapping)
Civil construction          : Month 6–14  (8 months — structure only)
Factory module assembly     : Month 4–12  (PARALLEL with civil)
Module installation         : Month 13–16
Commissioning & testing     : Month 16–18
Total                       : ~18 months  (14–22 months typical range)

// Schedule saving: 10–15 months — commercially significant at Indian DC leasing rates
// Revenue impact: 5 MW at ₹6 Cr/MW/year = ₹30 Cr/year — 12 months = ₹30 Cr saved

Pre-Engineered vs Purpose-Built: Full Comparison

India-Specific Constraints on Modular Deployment

Several factors specific to the Indian regulatory and commercial environment significantly affect the modular versus purpose-built decision — factors that are absent from European or North American evaluations of the same question.

• 01

  Basic Customs Duty on Imported MEP Equipment

  Pre-engineered modular data centres from major vendors (Vertiv, Schneider Electric, Huawei, ABB) are predominantly manufactured outside India. The Basic Customs Duty (BCD) on imported electrical equipment — UPS, switchgear, transformers, CRAC units — ranges from 7.5% to 28% depending on HS code classification, plus GST at 18%. On a ₹50 Cr MEP module procurement, this adds ₹8–15 Cr of import cost that is entirely avoidable by specifying equivalent locally manufactured equipment in a purpose-built design. Make in India specifications and PLI (Production Linked Incentive) scheme participation by Indian equipment manufacturers are further reducing the competitiveness of imported modular solutions.

• 02

  NBC 2016 and Local Fire NOC Requirements

  India’s National Building Code 2016 and the fire NOC process administered by state fire departments require compliance with specific Indian standards for fire detection, suppression, compartmentation, and emergency egress — not the NFPA or EN codes to which most foreign modular solutions are designed. Each module installation requires a site-specific fire NOC application demonstrating equivalence or compliance. This process adds 3–6 months to the approval timeline and is sometimes misrepresented by modular vendors as “already approved” when in fact only a generic factory design has been certified, not the specific site installation.

• 03

  DISCOM Transformer and Connection Standards

  The HV/LV transformer and switchgear interface with the DISCOM supply must comply with the relevant State Electricity Regulatory Commission (SERC) technical standards and the specific requirements of the local DISCOM. Foreign modular solutions often include transformers designed to IEC standards that differ from IS 2026 in testing requirements, oil specification, and protection relay settings. The DISCOM’s electrical inspection team may require additional testing, documentation, or modification before accepting connection — adding cost and delay that must be factored into the modular project schedule.

• 04

  Seismic Zone Compliance

  Significant portions of India are in seismic zones III, IV, and V per IS 1893. Modular units designed for seismic zone 1 or 2 (typical for European or Gulf market) may not meet the structural requirements for Indian sites. Seismic qualification of pre-engineered modules — particularly tall rack-mounted UPS and battery systems — requires documentation that vendors rarely have readily available for Indian seismic standards. Verify seismic certification for the applicable Indian zone before procurement, not after modules arrive on site.

Decision Framework: When to Choose Each Approach

The Hybrid Approach: Permanent Structure, Pre-Fabricated MEP

The emerging consensus among Indian data centre developers — particularly those delivering 10–50 MW facilities for enterprise or colo clients — is a hybrid approach that captures the schedule advantage of modular without accepting its full cost and flexibility penalties. The hybrid model has three elements:

Technical Specification Requirements for Modular Solutions

When specifying or evaluating a pre-engineered modular data centre for India, the following parameters must be explicitly documented and verified — they are frequently omitted from vendor proposals and discovered as issues during installation or regulatory approval.

Conclusion: The Right Tool for the Right Project

Modular pre-engineered data centres have earned their place in the Indian market as a legitimate delivery strategy for specific project contexts — particularly where speed-to-market drives the commercial decision and where the load profile and density requirements are within the range that modular products address well.

They are not the right answer for AI-density facilities, for large campuses where the lifecycle economics strongly favour conventional construction, or for clients whose requirements are sufficiently bespoke that a fixed-format module cannot accommodate them without expensive customisation that erodes the cost and schedule advantage.

The engineers and developers who navigate this decision well are those who define the project requirements precisely — commissioning date, power density, redundancy level, operational life, and expansion plan — and then evaluate both approaches against those requirements with India-specific cost, duty, and regulatory inputs. The approach that wins that evaluation is the right one for that project, regardless of what the same decision produced on the last project.

India’s data centre market is growing fast enough that both modular and purpose-built approaches will find abundant project contexts that suit them. The engineering discipline is matching each approach to its optimal context — not picking a favourite and applying it universally.