Getting your loft design right will not only mean a wonderful new room, it will also add many thousands of pounds onto the value of your home. So its worth doing right. Loft conversions can be built fairly quickly and with the minimum of disruption so your new room can rapidly make the transition from paper to reality.
Once you have established that your roof space is suitable for conversion you will want to begin drawing out (mentally if not actually on paper!) your project outline. You may consider a:
Bedroom with or without en-suite
A Bathroom
Living room
Home office
Children's playroom or teenager's chill-out room
Modellers loft or hobby room
Simple storage solution