Make sure the Velux rooflights above your staircase are the electric version so you can pull through natural ventilation and help temper the space during the warmer months. The inbuilt rain sensor means they automatically shut when it rains which removes any ongoing thought for them.
If only we had the budget to spec those - the skylights will be fixed frame in this case but the big Velux windows in the main room will be triple glazed with a heat reflective coating to try and mitigate the heat build up in the summer.
Make sure the Velux rooflights above your staircase are the electric version so you can pull through natural ventilation and help temper the space during the warmer months. The inbuilt rain sensor means they automatically shut when it rains which removes any ongoing thought for them.