The pianist and singer will play on top of the Shelter homelessness charity HQ in Old Street, London, on Tuesday, May 21.
The lunchtime show will also be streamed and fans can make requests on Twitter, the day after he releases new album Momentum.
Shelter chief executive Campbell Robb said: "This is the first time we've ever had someone perform live at our offices, let alone on our roof.
"It's great to have Jamie's support and we're really looking forward to hearing the new album."
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Expanding your horizons isn't possible right now. There are lots of mundane responsibilities that require your attention. Neglecting these duties will create enemies. People are relying on you to pull your weight. The sooner you tackle your work, the faster you will be able to enjoy some leisure time. Catching up on your reading, playing a sport or watching a movie will help you wind down. There are worse things than being held captive by a regular routine.More