Business Details
20 Years
experience
Expert Sash Window Repair & Replacement in Twickenham
SashWise is a family-run business established in 2006, specialising in the restoration, repair, and replacement of timber sash and casement windows across West London. Our team brings over 25 years of combined experience, utilising traditional craftsmanship alongside modern techniques to preserve the architectural heritage of period properties while enhancing energy efficiency and functionality. We prioritise quality materials, including sustainably sourced Accoya timber, and offer tailored solutions for draught-proofing, double glazing, and full window restoration.Our commitment to customer satisfaction is reflected in our local workshop in Twickenham, hands-on approach, and dedication to maintaining the historical character of homes. We serve areas such as Richmond, Kingston, and Wimbledon, ensuring each project aligns with the unique needs of the property and its owners.
Services
Sash Window Repair
Draught-Proofing
Double Glazing Upgrades
Full Window Restoration
Accoya Timber Windows
Aluminium Window Installation
Rot Repair
Security Enhancements
Glazing Options
Door Installation
Details
- Year established: 2006
Highlights and features
- We have over 25 years of combined experience in sash window restoration.
- Our team prioritises quality materials like sustainably sourced Accoya timber.
- We offer 0% VAT on all draught-proofing work.
- Local workshop in Twickenham ensures prompt, tailored service.
- We match original window designs to preserve period character.
Associations and certifications
- Forest Stewardship Council (FSC)
What people say
Proactive and professional
Delighted with windows
Faultless installation
Excellent communication
Preserved original character
Services
Sash Window Repair
We repair and restore timber sash windows, addressing rot, broken cords, and draughts while preserving historical integrity. Our methods combine traditional techniques with modern materials to ensure durability and energy efficiency. Ideal for Victorian, Edwardian, and Georgian properties seeking to retain their architectural charm.
Draught-Proofing
Our draught-proofing service eliminates cold air infiltration by installing discreet seals, enhancing comfort and reducing energy bills. This solution maintains the aesthetic of original windows while improving thermal performance. Suitable for both period and modern homes across West London.
Double Glazing Upgrades
We upgrade sash windows with double glazing, including Fineo vacuum units, to improve insulation without altering period aesthetics. This service enhances noise reduction and energy efficiency, ideal for listed buildings and conservation areas requiring sympathetic renovations.
Accoya Timber Windows
We craft windows from Accoya timber, a durable, FSC-certified material with enhanced stability and longevity. These windows resist warping and decay, offering a sustainable choice for replacements that align with environmental goals and historical preservation standards.
Aluminium Window Installation
We install aluminium windows designed for slim sightlines and heritage compatibility, combining modern efficiency with traditional aesthetics. These low-maintenance windows suit both period properties and contemporary homes, available in a range of powder-coated finishes.
People
Dan Johnston
Owner and Managing Director
Dan leads SashWise with over 17 years of hands-on experience, overseeing daily operations and on-site installations. A passionate advocate for preserving architectural heritage, he ensures every project reflects the company's commitment to quality and customer satisfaction.
Melissa
Office Manager
Melissa manages client relationships, marketing, and administrative operations, ensuring seamless communication and project coordination. Her organisational skills and dedication to customer service make her the first point of contact for SashWise clients.
Tim
Senior Window Fitter
Tim specialises in on-site installation and restoration, bringing expertise in traditional window techniques. His attention to detail and commitment to craftsmanship ensure every project meets SashWise's high standards for quality and durability.
Jay
Senior Window Fitter
Jay handles complex installations and repairs, combining technical skill with a deep understanding of period architecture. His work ensures clients receive functional, aesthetically authentic window solutions tailored to their properties.
Thomas
Trainee Window Fitter
Thomas is learning all aspects of window fitting and restoration, demonstrating enthusiasm and a keen eye for detail. His training ensures the continuation of SashWise's tradition of skilled craftsmanship and customer-focused service.
Questions
What areas do SashWise serve?
We operate across West London, including Twickenham, Richmond, Kingston, Wimbledon, Kew, and surrounding areas, offering tailored window solutions for period and modern properties.
Do SashWise services include draught-proofing?
Yes, we provide draught-proofing solutions that enhance energy efficiency while preserving the original appearance of your windows, with 0% VAT on all related work.
What materials do you use for window replacements?
We use sustainably sourced Accoya timber and FSC-certified materials, ensuring durability and environmental responsibility. We also offer aluminium windows for modern efficiency.
Can you restore historic sash windows?
Yes, our restoration service sympathetically repairs and rejuvenates historic windows, retaining their character while improving functionality and longevity using traditional methods.
Are your window installations energy efficient?
Our double glazing upgrades, including Fineo vacuum units, significantly improve thermal performance and noise reduction, meeting modern energy standards without compromising aesthetics.
How does SashWise support sustainability?
We partner with Ecologi to plant a tree per order, use recyclable materials, and prioritise sustainable practices, including a paperless workflow and waste recycling.
