Sash Window Conservation are a specialist heritage window and door restoration and manufacturing, working with architects, main contractors and conservation professionals across the UK. Established over 20 years ago to meet the growing demand for high-quality, conservation-led solutions, we provide a comprehensive service for the repair, refurbishment and manufacture of traditional timber sash and casement windows and doors.

Our in-house team of skilled joiners, technicians, and site operatives operates from our dedicated joinery workshop and factory in Kent, allowing us to produce bespoke, performance-led products at scale.

We design and manufacture fully bespoke windows and doors that maintain the architectural integrity of period buildings while meeting modern standards for energy efficiency, acoustic performance, and security.

Our philosophy is simple: respect the past, embrace the future. All of our products can incorporate draught proofing, compliant U- and G-values, and meet ISO 9001 quality standards. We also offer acoustic-rated windows to BS717-12:2013 and our own enhanced security solution – the Sash Secure 240 anti-attack window.

We work collaboratively with specifiers at every stage, offering full surveys, technical reporting, and detailed restoration or replacement strategies. Whether it is a sensitive repair, conservation-grade replication, or high-performance new joinery, we deliver solutions with integrity, craftsmanship and proven long-term value.

PAS 24 - Vertical Sliding Sash Window