EXPERT SPEAK | FROM THE FOUNDER OF THERMALINE
I’ve been in the aluminium fenestration business for close to twenty-eight years now. And if there’s one thing I’ve learnt, it’s that windows don’t always get the attention they deserve when a building is being planned. For me, office window design deserves attention from the very first drawing.
I’ve seen how much thought goes into designing a new office. The entrance has to make an impression. The interiors need to look contemporary. There are discussions about lighting, flooring, furniture, colours and, of course, the view.
All of these are important.
But somewhere in these conversations, the actual performance of the windows can get overlooked.
That’s a little surprising, considering how much we expect from them.
Think about it. We want large glass openings, slim frames, smooth operation, less noise, better insulation and years of trouble-free use. And we want all of this in a country where temperatures, weather and building requirements can vary enormously from one city to another.
That’s quite a lot to ask of a window.
Office Window Design on the 30th Floor Is a Different Proposition
India’s commercial real estate sector is growing rapidly. JLL reported that gross office leasing reached 83.3 million sq. ft. in 2025, up 7.8% from the previous year.
More offices, taller buildings and increasingly ambitious architecture.
It’s exciting to see. But it also means we need to be more particular about what goes into these buildings.
Take a high-rise office, for example.
A sliding window installed on the fourth floor and an identical-looking one on the thirtieth floor may have very different structural requirements.
Wind pressure is influenced by height, exposure, building geometry and location. That’s why standards such as IS 875 (Part 3):2015 exist.
Yet it’s easy to get caught up in how slim a window profile looks or how large the glass panel can be.
My suggestion to architects and developers is simple: ask about wind-load performance before finalising the system. Ask whether the proposed glass size and shutter weight are suitable for that particular building.
These are much easier questions to address on the drawing board than at the installation stage.
We Talk About Air-Conditioning. What About the Heat Coming Through the Windows?
Here’s another area I feel deserves more discussion.
When planning an office, considerable attention goes into selecting air-conditioning systems. Capacity, efficiency, operating costs. Everything is evaluated.
But office window design, as part of the building envelope, can have a significant influence on the cooling load.
According to the Bureau of Energy Efficiency, buildings account for more than 30% of India’s electricity consumption.
In cities like Ahmedabad, Delhi or Hyderabad, summer heat is hardly a minor consideration.
Aluminium is a wonderful material for window systems. It’s strong, versatile and allows considerable design flexibility. But it’s also a good conductor of heat.
That’s where thermal breaks come in.
Put simply, a thermal break is an insulating barrier between the outer and inner aluminium sections. It helps reduce heat travelling through the frame.
Does that mean installing thermally broken windows will automatically reduce an office’s electricity bill? No. That would be an oversimplification.
The glass, the building’s orientation, external shading, air leakage and several other factors matter too.
But it does mean that window specifications deserve a place in the energy-efficiency discussion, not just the architectural one.
Everybody Wants a Bigger View
And I can understand why.
Walk into an office with large glass openings and a clear view of the city, and the space immediately feels different.
Minimal aluminium frames have made it possible to achieve some beautiful results.
But I often feel that the conversation stops at how narrow the frame can be.
What about the weight of the glass?
What about the rollers and tracks that will carry that weight every time someone opens the window?
What about structural deflection, locking arrangements and long-term maintenance?
A large sliding shutter can weigh several hundred kilograms. Making it look effortless is one thing. Making it operate reliably for years is another.
For me, that’s where good engineering really shows.
A Great View Isn’t Much Fun If You Can’t Hear Yourself Think
Consider an office overlooking a busy road in Mumbai or Bengaluru.
The view may be wonderful. But if traffic noise constantly interrupts meetings, the experience changes rather quickly.
Sound insulation deserves a place in office window design before the windows are ordered.
And no, simply choosing thicker glass isn’t always the answer.
Acoustic performance depends on the glass composition, frame, seals, installation and how all these elements work together.
A properly specified system can make a meaningful difference. But it needs to be designed around the actual noise conditions outside the building.
There’s little point discovering an acoustic problem after the office is occupied.
The Real Test Begins After the Office Opens
There’s a tendency to judge building materials by how they look when a project is completed.
I think that’s only half the story.
What matters just as much is how they perform five or ten years later.
Do the shutters still slide smoothly? Are the seals doing their job? Is the hardware accessible for maintenance? Can components be replaced without major disruption?
These may seem like small details during construction. They don’t seem quite so small when an office is fully operational.
For developers and office owners, I would always suggest considering the total cost of ownership rather than looking only at the initial quotation.
A window is not something you want to keep replacing.
Something Worth Thinking About
I’m genuinely encouraged by the direction Indian commercial architecture is taking. We’re seeing better design, more ambitious structures and greater attention to the experience of people using these spaces.
I only hope that the engineering behind the visible design receives the same attention.
The next time you’re reviewing plans for a new office, spend a little more time discussing office window design.
Not just their size, colour or appearance.
Ask what they’re expected to withstand. Ask how they’ll perform in summer. Ask about noise, operation and maintenance.
Because once the office is occupied, nobody really thinks about the windows unless something goes wrong.
And perhaps that’s the best measure of a well-engineered window. You shouldn’t have to think about it at all.
References
- JLL India — India’s Office Market Scales Unprecedented Highs, January 2026.
https://www.jll.com/en-in/newsroom/india-s-office-market-scales-unprecedented-highs-with-gross-leasing-activity-at-83-3-million-sq-ft-for-the-year-2025-jll - Bureau of Energy Efficiency, Government of India — Building energy consumption and efficiency.
Buildings Background — Bureau of Energy Efficiency - Bureau of Indian Standards — IS 875 (Part 3):2015, Wind Loads.
https://www.bis.gov.in/