What to do. If you think you or someone else has broken their leg, go immediately to your nearest accident and emergency (A&E) department. Call 999 for an ambulance if the injury seems severe or you're not able to get to A&E quickly. While you make your way to A&E or wait for an ambulance:
A venting skylight usually costs between $300 and $600 for a manual version, and between $650 and $1,000 for an electric version with a remote control. Installation can run $300â$2,000 or more, depending on the size and complexity of the project.
Since we subtract the cost of building a shaft, your total cost will be about $750 less than adding new skylights to a roof with full attic. Thus, adding a new skylight to a cathedral ceiling roof should cost about $2000-3800 depending on the details.