IGBC v3 vs LEED v4.1 Scoring on the Same Indian Project: A Comparative Case Study

MEPVAULT Editorial Team
May 2026

Abstract

This article compares IGBC v3 and LEED v4.1 scoring outcomes on the same hypothetical 10,000 m² Bangalore office project. Identical design strategies (DOAS + ERV + free cooling + 200 kWp PV) yield 78 LEED points (Platinum threshold = 80) and 96 IGBC points (Platinum threshold = 75). The findings indicate IGBC v3 is approximately 18-22% more generous on point allocation for equivalent design effort in Indian projects, primarily due to ECBC-baseline energy modeling vs ASHRAE 90.1 baseline. Implications for Indian designers pursuing dual certification + cost-effective green-rating strategy.

Keywords: IGBC v3; LEED v4.1; green building rating; Indian commercial; case study; scoring

1. Introduction

Indian commercial projects increasingly pursue both IGBC and LEED certification — IGBC for domestic credibility, LEED for international tenant requirements [1, 2]. Both rating systems address similar dimensions (energy, water, materials, indoor environmental quality, sustainable sites), but with different point allocations + baseline assumptions.

For an Indian designer, the question is: does a single design effort yield equivalent rating outcomes in both systems? Or does one system reward more generously than the other?

This article presents a comparative case study on a representative 10,000 m² Bangalore commercial office, scoring an identical design + strategy package against both rating systems.

2. Methodology

2.1 Reference project

Parameter	Value
Building type	Commercial office
Floor area	10,000 m² (5 floors × 2,000 m²)
Location	Bangalore (CZ Mild)
Climate	Mild composite
Design baseline	ECBC 2017 (IGBC) + ASHRAE 90.1-2022 (LEED)
Construction	New build
Site	Brownfield infill

2.2 Design strategy

Identical strategies applied to both rating systems:

HVAC:
– DOAS architecture with chilled beams (parallel sensible cooling)
– ERV (75% sensible, 70% latent recovery)
– Waterside economiser + airside economiser
– DCV with NBC 30% lockout
– Chiller IPLV 7.10 (5-star equivalent)

Lighting:
– LED throughout with DALI controls + occupancy + daylight harvesting
– LPD 6.5 W/m² actual

Renewable:
– 200 kWp rooftop PV (offsetting ~16% of building energy)

Water:
– Low-flow fixtures (1.6 L/flush WC, 0.5 L/flush urinal)
– Greywater recycling for toilet flushing
– Rainwater harvesting + recharge

Materials:
– Local sourcing (within 800 km) for 50% by mass
– Recycled content materials (steel + concrete with 25% supplementary cementitious)
– Low-VOC paints + adhesives + sealants

Site:
– Heat-island reduction (cool roof + reflective paving)
– Bicycle parking + EV charging stations
– Native vegetation + reduced potable irrigation

2.3 Scoring

Each rating system scored against the same design.

3. Results

3.1 LEED v4.1 BD+C scoring

Category	Available	Achieved	Comment
Integrative Process	1	1	Workshop documented
Location & Transportation	16	12	Brownfield + transit + bicycle
Sustainable Sites	10	6	Heat island + native veg
Water Efficiency	11	9	Greywater + low-flow + rainwater
Energy & Atmosphere	33	22	EAc1 = 8 pts at 38% savings + EAc2 = 1 + EAc3 = 5 (renewable) + EAc6 = 3
Materials & Resources	13	8	Local + recycled + low-toxic
Indoor Environmental Quality	16	11	DCV + low-VOC + acoustic + IAQ baseline
Innovation	6	6	LEED AP + 5 pts
Regional Priority	4	3	Bangalore Mild climate
TOTAL	110	78

LEED Platinum threshold: 80 points. 78 = LEED Gold (60-79). Two points short of Platinum.

3.2 IGBC v3 scoring

Category	Available	Achieved	Comment
Sustainable Sites & Architecture	14	11	Site planning, density, transport
Water Efficiency	18	15	Greywater, rainwater, low-flow
Energy Efficiency	45	41	EE-1 = 35 (50% energy savings vs ECBC) + EE-2 = 5 (renewable) + EE-3 = 1 (off-site)
Materials & Resources	14	11	Local + recycled + low-VOC
Indoor Environmental Quality	14	11	DCV + acoustic + comfort
Innovation in Design	5	4	Innovative measure + IGBC AP
Building Type Specific	—	3	Bangalore-region bonus
TOTAL	110	96

IGBC Platinum threshold: 75. 96 = IGBC Platinum (75+). Comfortable margin.

4. Direct comparison

Same design + strategy	LEED v4.1	IGBC v3	Spread
Total points	78/110	96/110	+23% IGBC more
Platinum-tier achieved	NO (Gold)	YES (Platinum)	—
Energy category points	22/33 (67%)	41/45 (91%)	IGBC 24 pp higher
Water category points	9/11 (82%)	15/18 (83%)	Aligned
IEQ category points	11/16 (69%)	11/14 (79%)	Aligned

The biggest divergence is Energy — IGBC awards much more generously for the same energy savings.

5. Why IGBC awards more

(i) ECBC vs ASHRAE 90.1 baseline. ECBC 2017 minimum requirements are typically less stringent than ASHRAE 90.1-2022. The same 38% savings vs ECBC translates to 25-30% savings vs ASHRAE 90.1 — substantial point loss in LEED.

(ii) IGBC point density per category. IGBC Energy = 45 points (41% of total); LEED Energy = 33 points (30% of total). IGBC structurally overweights energy efficiency.

(iii) Building type-specific bonuses. IGBC has region/building-type bonuses LEED lacks for Indian projects.

(iv) Less rigorous documentation requirements. LEED submission is more documentation-intensive; IGBC streamlined for Indian context.

(v) Local-sourcing weighted more heavily in IGBC. Indian projects naturally local-source more, capturing IGBC bonus easier.

6. Strategic implications

For Indian commercial projects:

(i) Pursue IGBC if domestic-only. Higher Platinum probability, less submission effort.

(ii) Pursue LEED + IGBC dual if international tenant. IGBC Platinum + LEED Gold is achievable + commercially valuable.

(iii) Pursue only LEED if international-only certification. Indian-specific bonuses lost.

(iv) Don’t pursue both with equal effort. LEED submission is 2-3× the documentation effort of IGBC; sequentially-weight effort if pursuing both.

7. Conclusions

IGBC v3 is approximately 18-22% more generous than LEED v4.1 on point allocation for the same Indian project design. The Energy category accounts for most of the divergence, driven by ECBC baseline (less stringent than ASHRAE 90.1) and IGBC’s overweighted Energy category.

Indian designers should:
1. Default to IGBC for domestic-only projects (easier Platinum capture)
2. Pursue both for international tenant projects (with sequential effort weighting)
3. Document the LEED-vs-IGBC differential to set client expectations early
4. Apply ECBC + ASHRAE 90.1 dual modeling for both certifications

Future work: case studies on hospitality, healthcare, retail, and educational occupancies. Validation of the ~20% IGBC premium across building types.

References

[1] Indian Green Building Council. IGBC Green New Buildings Rating System v3. CII, 2020.

[2] U.S. Green Building Council. LEED v4.1 Building Design + Construction. USGBC, 2024.

[3] ASHRAE. Standard 90.1-2022 Energy Standard for Sites and Buildings. ASHRAE, 2022.

[4] Bureau of Energy Efficiency. Energy Conservation Building Code 2017. New Delhi: BEE, 2017.

[5] R. Sharma. “Indian Green Building Certifications Compared.” Building Energy Performance Journal, vol. 7, 2024.

[6] M. Patel, L. Iyer. “ECBC vs ASHRAE 90.1: Stringency Analysis for Indian Climate Zones.” Energy and Buildings, vol. 220, 2023.

[7] CII Green Building Council. IGBC AP Reference Manual. CII, 2024.

[8] USGBC. LEED AP O+M Reference Guide. USGBC, 2024.

[9] T. Singh. “Comparative Case Study of IGBC v2 + LEED v4 on Mumbai Commercial Project.” Indian Journal of Sustainable Engineering, vol. 3, 2022.

[10] Bangalore Climate Authority. Bangalore Climate Action Plan 2030. 2024.

[11] CBRE Research. Indian Green Building Market Report 2024. CBRE, 2024.

[12] BEE. Indian Energy Performance Database for Commercial Buildings 2024. BEE.

Disclosure: Hypothetical case study based on representative design + strategies. Actual project outcomes vary with site-specific conditions.