Gothic architecture is so last century.

A French architecture firm wants to turn the Notre Dame cathedral’s roof into a giant, sustainable greenhouse.

The new proposal from studio NAB would see the 856-year-old house of worship’s spire replaced with a glass apiary filled with bees and a huge, indoor garden extending along the entire roof.

France is currently debating how best to rebuild the French Gothic cathedral after it was partially destroyed when a massive blaze broke out on April 15 while it was undergoing restoration.

In NAB’s re-imagining, the burnt wooden framework of the attic would be reused to create planters in the greenhouse, and the original silhouette of the building would remain.

But the spire and roof would be replaced with a gold-tone steel structure, covered by giant glass panels.

Honey-producing bees previously lived on the roof in wooden boxes — more than 180,000 of which miraculously survived the fire — and NAB says bees would move back into the new spire, creating “the honey of Notre Dame de Paris.”

The studio said educational workshops could be organized within the greenhouse to “reconnect our children to nature.”

At a press conference in the wake of the blaze, French Prime Minister Edouard Philippe proposed an international architecture competition to redesign the cathedral’s spire, saying the project should be “adapted to issues of our time.”

The cost of repairing the Notre Dame is expected to exceed $1 billion, a spokesperson for the cathedral said.

So far, a staggering $835 million has been pledged towards the reconstruction, with money coming in from both billionaires and schoolchildren.

Architects say it could take decades to repair the extensive damage to the Paris landmark, which is visited by 13 million people each year.

But French President Emmanuel Macron has called for the cathedral to be rebuilt within five years.