Rafter spacing
Standard roof window sizes are designed around typical rafter spacing, though non-standard spacing can usually be accommodated with some extra work.
Roof pitch
Most roof windows work across a range of pitches, but very shallow or very steep roofs may need a specific product suited to that angle.
What's happening below
Where the window sits relative to the room layout below matters as much as where it fits structurally — a survey looks at both.
Any planning considerations
Most roof windows fall under permitted development, but certain properties or areas may have specific requirements worth checking first.
A quick survey from our team will confirm what's possible for your specific roof.