Vertical Sliding Sash Windows – Period Charm with Modern Performance

Vertical sliding sash windows are synonymous with the elegant Georgian and Victorian architecture that defines so many of Ireland’s most beautiful streets and period properties. Their distinctive sliding action, where the upper and lower sashes slide vertically past each other to open and close, creates a timeless aesthetic that is irreplaceable in heritage contexts. Northern Storm’s uPVC vertical sliding sash windows reproduce this classic appearance with extraordinary faithfulness, while delivering the thermal performance, security, and low maintenance that modern homeowners demand.

Traditional timber sash windows, while beautiful, require intensive and expensive ongoing maintenance. The sash cords and weights that operate the balance mechanism are prone to failure, the timber frames are vulnerable to rot and warping in Ireland’s damp climate, and draught exclusion is typically very poor. Our uPVC sash windows solve all of these problems while retaining the visual character that makes sash windows so architecturally valued.

Our sash windows use a spring-balance mechanism concealed within the sash box, providing smooth, counterbalanced operation that allows both sashes to be positioned at any height with minimal effort. The tilt-clean function allows both inner and outer glass surfaces to be cleaned safely from inside the property, eliminating the need for external access. Weatherseal pile brushes run around every sash perimeter, creating an effective barrier against draughts and rain while allowing smooth operation.

The thermal performance of our sash windows far exceeds that of traditional timber equivalents. Our sealed double-glazed units with A-rated low-emissivity glass and argon gas fill deliver U-values that meet Irish building regulation requirements for replacement windows, contributing to meaningful reductions in home heating costs and improved BER ratings.

Authentic Period Detailing & Customisation

We offer our sash windows with a range of authentic period detailing options including astragal bars (the internal glazing bars that divide the sashes into smaller panes), run-through horns on the lower sash, and traditional ovolo moulding profiles. Colour options include classic white, cream, and a range of heritage colours. These details allow our sash windows to match existing period windows on adjoining properties or to satisfy planning authority requirements in conservation areas.

As an approved SEAI contractor, Northern Storm can help homeowners access available grants for energy-efficient window replacement. Our team will visit your property, assess your existing windows, and provide a comprehensive quotation that includes any applicable grant deductions. Contact us today to discuss your vertical sliding sash window project.