Loft conversions have four window options and the right one depends on planning, roof geometry and how you'll use the space.
The easiest and cheapest option — fitted between existing rafters, minimal structural impact, permitted development in most cases. Best where the roof pitch is between 15° and 90° and daylight from above is enough. Downside: no side views, high sun-gain in summer if unshaded.
A dormer is a box-out from the roof plane, creating standing headroom and a vertical window. Rear dormers usually fall under permitted development (subject to size limits). Front dormers usually need planning. Dormers deliver much more usable floor area than rooflights but require a structural project — worth it for main-bedroom loft conversions.
If your loft conversion touches a gable end, a big triangular gable window transforms the space. It's cost-effective (no structural roof work), delivers a stunning view and doubles as an emergency egress. Almost always worth including if the geometry allows.
A Juliet balcony is a French door with a decorative external railing — no actual balcony, just the doors opening onto a rail. It gives you full-height openable glass in a loft without the planning complexity of a real balcony. Popular in rear-facing loft conversions overlooking gardens.
Every loft bedroom needs a compliant fire escape route. Either a fire-rated stair down (which is what most loft conversions do) or an egress window: minimum 450mm × 450mm openable area, at least 800mm × 800mm clear opening area (Building Regs Part B). Check with the loft conversion company at design stage.
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