Flush Casement vs Standard Casement

A standard stormproof casement has a sash that sits proud of the frame, giving that familiar stepped shadow line. A flush casement closes into the frame so the outer face is one clean plane, like a traditional joinery window.

Both are good windows. The choice is mostly about the age of the building and how much the frontage matters to you.

How they look

On a period cottage or a Victorian terrace, the flush profile reads correctly because it copies the original joinery. On a nineteen eighties estate house, a stormproof casement looks entirely at home and nobody would call it wrong.

Weather performance

The stormproof overlap exists for a reason: it sheds driving rain very effectively, which matters on exposed coastal and moorland elevations. Modern flush systems use multiple gaskets to match that performance, and on a properly fitted unit the difference in real use is negligible.

Cost and planning

• Flush casements typically carry a premium of around fifteen to twenty five per cent
• Flush profiles are far more likely to be accepted in a conservation area
• Heritage colours and astragal or Georgian bars suit flush frames better
• Standard casements offer the widest choice of budget hardware

How we usually advise

If the elevation is visible from the street on a period property, spend the extra on flush. If it is a rear elevation, a modern build or a rental, a good stormproof casement is the better use of the budget.

Questions people ask