George Kontaroudis of kw/h architecture argues for material honesty and Passive House design, and shows how listening to contractors let a Greek builder hit airtightness targets using traditional lime plaster instead of imported methods.

George Kontaroudis, Principal Architect, kw/h Architecture

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In this conversation

How a marble-clad villa George passed on his walk home from school taught him to care about material honesty.

Why he detailed a precast brick building as if every brick were laid by hand, and kept big cantilevers in metal.

His warning that retrofits with good windows and insulation but no continuous mechanical ventilation trap humidity and CO2, and that opening windows is never enough.

How a Greek contractor who had never built a Passive House hit the airtightness target using traditional lime plaster instead of a membrane.

His approach to construction administration from Brooklyn: three key details, step-by-step diagrams, and daily photo calls with a local architect.

Why AI massing tools only save time when an experienced architect writes the prompts and judges the output.

I like something that looks like wood to be wood, I like something that looks like stone to be stone.

George Kontaroudis

Chapters

Growing up with an architect father

Stories from the Middle East boom, a pre-Olympics building boom in Athens, and why master plans were not for him.

Wood should be wood

Material honesty, contextual design, and a precast brick building that reads as hand laid.

Buildings and carbon

Why the share of emissions from buildings makes Passive House design a responsibility.

By the numbers

71%

Share of New York City greenhouse gas emissions that come from buildings

George puts the New York figure at about 70%. The City Council's own emissions data puts it at 71%.

Source: New York City Council Data Team, Climate Mobilization Act ↗

The ventilation problem

Why airtight retrofits without mechanical ventilation smell of humidity, and why windows cannot fix it.

Lime plaster in Greece

Listening to contractors, using a traditional material for airtightness, and running the site from Brooklyn.

AI and staying open

Where AI massing tools fall short, and his advice to keep learning and never be stubborn.

Opening a window is never going to be enough.

George Kontaroudis

Takeaways

Kontaroudis says buildings account for about 40% of global CO2 emissions, and around 70% in New York City.

Retrofits that add good windows and insulation without continuous mechanical ventilation trap humidity and CO2, and he says opening windows is never enough.

On a Passive House in Greece, properly mixed lime plaster served as the airtightness barrier, with liquid membrane only in hard-to-reach spots.

He ran construction administration from Brooklyn with three key details, step-by-step diagrams and daily photo calls with a local architect.

He finds AI massing tools only save time when an experienced architect writes the prompts and judges the output.

I can't stress enough how important it is to never think that you know everything.

George Kontaroudis