SashWise Limited

SashWise Limited are a trusted name in timber sash and casement window replacement and repair across West London. Based in Twickenham, we are a family-owned and operated business that has proudly served the local community since 2006. With nearly two decades of experience and a reputation for excellence, we take immense pride in preserving the charm and character of period properties through our expert craftsmanship.

At SashWise, we are more than just a business – we are a team of passionate artisans and craftsmen dedicated to preserving a vital part of Britain’s architectural heritage: timber sash windows. Founded by Dan Johnston, who leads a dedicated team of highly skilled window fitters, our company operates with a strong ethos of quality, transparency, and customer satisfaction.

Our team collectively brings over 25 years of experience to every project. Whether working on a stately Georgian home, a quintessential Victorian terrace, or an elegant Edwardian villa, we approach every job with the same meticulous attention to detail that has earned us our stellar reputation.