It looks like a case of extreme home renovation - a man risks death by clinging to the edge of a 12th floor balcony with one hand while he drills a window frame with the other.

The bizarre DIY attempt was filmed by a curious neighbor in the Siberian city of Tyumen, after they spotted a man fitting a window on the 12th floor of a residential building without any safety harness.

In the short video, the workman can be seen standing precariously on a brickwork ledge while holding what appears to be an electric drill.

Despite being one wrong foot away from a horrific fall, the handyman can be seen calmly working away while a second person assists him from the safer confines of the apartment balcony.

Tyumen has a population of around 744,000 people. It was the first Russian settlement in Siberia.

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