About Us

Poly Passive Mouldings, trading as Passive Sills, is the leading specialist provider of super lightweight, thermally efficient, and cost-effective window sills, oversills, and insulated thresholds, compliant with current Irish and UK building regulations and energy efficiency standards. We design, fabricate, and supply our products to commercial and residential projects internationally from our manufacturing facility in Ireland.

Our products are recommended by leading architects, engineers, and construction professionals. The Passive Sills product range is used extensively by construction developers, building firms, and Local Authorities in private and social public housing, as well as in commercial developments.

For home energy efficiency improvements, whether you are self-building or a small contractor, your project will be future-proofed when you include Passive Sills products.

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Meet the team


Patrick Beausang

CEO and Founder of Passive Sills

+353 21 201 9056

Adam McCarthy

Head of Marketing

+353 21 201 9056

Aileen Beausang

Management Team

+353 21 201 9056

Henrietta Szemmelroth

Sales and Administration

+353 21 201 9056

Sophie Carey

Accounts and Administration

+353 21 201 9056