When people ask me why we chased an IGBC Gold rating for a 1.8 lakh sq ft mixed-use building instead of simply putting up walls and a roof, I tell them the truth: the building had a job to do beyond sheltering people. It had to pay for compassion.

Housed within it is a special school. Around that school sit corporate offices, an auditorium, and learning centres. About half the space is leased to corporates, and together with the income from the auditorium, this became our main source of revenue. The arithmetic of the project was unusual and, to me, deeply motivating. Every rupee we saved on running the building was a rupee that could go toward keeping the school alive and well, and toward welcoming more special children through its doors. So this was never really about earning a green plaque. It was about optimising expenses so that the savings could quietly underwrite a mission. As the project manager, and as a civil engineer who has seen a fair number of sites, I made it a personal rule that every penny would be put to the right use.

This was my second green building. The first taught me the grammar. This one asked me to write a sentence worth reading.

It had to pay for compassion.

A mandate, not a marketing line

The land belonged to the DDA and was leased to the Trust, which gave the whole endeavour a sense of stewardship rather than speculation. Located in New Delhi's Qutub Institutional Area, the building took shape over three years from 2015, longer than planned, mostly because the design kept evolving. ISAP came in as working architects, Hafeez Contractor shaped the façade, and R&G Architects eventually carried the design forward while holding on to the original space planning. The final project cost was around ₹65 crore, of which roughly 8–10% was the “green premium.”

That 8–10% is the number sceptics fixate on. What they miss is everything it buys back.

The systems beneath the skin

A green building is mostly invisible. What you feel is comfort; what you don't see is the engineering that produces it quietly and cheaply.

For energy, we started with the envelope, external double walls and a ventilated stone façade, glazed with high-performance double-glazed units from Saint-Gobain, a layered skin that keeps the sun's heat at the surface rather than in the rooms. Cooling runs on a Trane chilled-water system with variable-frequency drives on the pumps and is supported by geothermal heat pumps, so the plant only works as hard as the moment demands. LED lighting throughout keeps the electrical load lean, and a Siemens building management system keeps watch over all of it. On the roof, an 80 kWp Canadian Solar array, later joined by another 100 kWp of Canadian Solar panels on micro-inverters, does something I still find satisfying to say out loud, it supplies close to half the building's electricity. We squeezed the rest by tuning chiller set points and running the plant on timed operations rather than brute force. The school, in particular, was planned around a treated fresh air (TFA) system, drawing in filtered, conditioned outdoor air so that the children always breathe clean, a detail that matters more in a special school than almost anywhere else. We later optimised that system to function fully as the air conditioning too, so a single set of equipment now does the work of two: ventilating and cooling at once.

For water, the building harvests rainwater, treats its own sewage and water on site, and uses low-flow fixtures throughout, the unglamorous backbone of any serious sustainability claim. Permeable paving across the driveways and walkways lets rain drain naturally back into the ground, while drip irrigation keeps the landscape green on a fraction of the water it would otherwise drink.

For materials, we used fly ash, recycled and locally sourced content, low-VOC paints, and certified eco-friendly plywood and adhesives. These choices rarely make it into the brochure, but they are what make a building honest.

The parts I'm proud of

The external double walls with a ventilated stone facade, which shoulder the worst of Delhi's heat so the building stays cool on far less air-conditioning, and far less energy. The terrazzo flooring, which is both beautiful and built to outlast trends. The immense green cover that softens the whole site. And the in-house composting, which closes a loop most buildings never bother to.

Together they produced an outcome I didn't fully expect: for much of the year, the building simply stays cool on its own. Occupants noticed it before any meter did, comfortable spaces, often without the air-conditioning working overtime. That is the quiet dividend of getting the envelope right.

What it actually took

I won't pretend it was effortless. The hardest part wasn't the technology or the documentation, the IGBC certification process itself was refreshingly straightforward, ably assisted by EDS Delhi. The hardest part was people. Convincing contractors and suppliers to actually follow green compliances, day after day, on a real site with real deadlines, took persistence. Green building is as much a discipline of habit as it is of design.

And not every ambition survived. We had hoped to install a heat recovery wheel and, in the end, couldn't. I've made peace with it. Sustainability isn't about a perfect scorecard; it's about doing the most you responsibly can with what you have, and being clear-eyed about the rest.

Why the Gold mattered

When the IGBC Gold rating finally came through, it felt like a quiet satisfaction, not because of the certificate, but because of what it represented. We had come within just a few points of Platinum, the tier above, and I will admit those points still nag at me a little. But Gold, earned honestly on a real, working building, was recognition of exactly the right kind. The project was managed well, with many hands contributing to its success, directly and indirectly. It kept faith with the Trust's mission and produced something that would go on funding a school through its own efficiency for years to come. Roughly half the electricity from sunlight, a building that cools itself, water it recycles, waste it composts, and a special school steadily supported by the savings.

And a green building is never finished on handover day. For more than five years afterwards I stayed on as the estate manager, because a rating is only as good as the way a building is run. That work was continuous: training and motivating a team to treat efficiency as a daily habit, watching the meters, tuning the systems, and making sure the savings we had designed for actually showed up, year after year. A building does not stay green on its own; people keep it that way.

That is the kind of building I want to keep making, and keep running: one that earns its keep, and then some.