The loft is the warmest room in the summer and the coldest in the winter. A converted loft space will still have these issues. Below are some tips on keeping your loft conversion cool in summer.
The most important thing for keeping your loft cool is ventilation. When getting a loft conversion, your builder will consider this with the insulation. There are, however, minimum requirements that they must adhere to.
You could consider the colour of your roof tiles, and whilst undertaking the conversion, replace your tiles with lighter ones. The reason for this is that light colours reflect heat, whilst dark colours absorb heat.
The most effective way to ventilate a loft space is through windows. Roof windows are specifically designed to improve airflow as they include ventilation flaps to allow fresh air to circulate even when the window is closed.
An air conditioning unit could also be considered for those days when no matter what you try, the room remains hot.