Supply chain you can audit. Systems that hold.
Castle Windows manufactures aluminium and UPVC systems from UK-based production with European profile sourcing. Every stage is documented. No thermal compromise, no ambiguity at despatch.
Controlled from extrusion to despatch
Profile extrusion begins with European-sourced billets held to dimensional tolerance. UK fabrication converts certified profiles into installation-ready geometry. Despatch checks confirm load-tested longevity before anything leaves the facility.
Profile extrusion
UK fabrication
Despatch verification
Every order checked against the project specification before release. Transparent technical data included with each consignment.
Dimensional accuracy verified against section drawings before profiles enter stock. Tolerances recorded per batch.
Corner joints, gasket seating, and hardware prep completed in-house. No third-party interpretation of spec.
Engineers in the supply relationship, not behind a helpdesk
From initial specification through to on-site sign-off, Castle engineers are available to verify system suitability, confirm thermal ratings, and resolve installation geometry before it becomes a programme delay.