Sash Window Repairs
We don’t just repair sash windows – we preserve the stories, detail, and design that make them timeless
At GC Doors, we specialise in the meticulous repair, restoration, and long-term preservation of traditional sliding sash windows. With a deep appreciation for period architecture and a commitment to skilled craftsmanship, we breathe new life into these iconic features—enhancing their function, efficiency, and appearance while preserving their original charm.
We work across a wide range of property types, from elegant Georgian townhouses and classic Victorian terraces to Edwardian villas and historically significant commercial buildings. Whether you own a listed residential property, manage a heritage office space, or are responsible for a building in a conservation area, our team brings expert knowledge, traditional techniques, and a respectful approach to every project.
Our goal is simple: to retain the architectural integrity of your property while ensuring your sash windows perform to modern standards. From minor repairs to full sash refurbishments, we deliver thoughtful, reliable solutions tailored to the unique needs of each building we work on.
Sash Windows
Georgian Sash Windows (1714–1830)
Georgian sash windows are prized for their symmetry, proportion, and understated elegance. Typically composed of six-over-six panes with slim glazing bars, these windows are often found in listed buildings and conservation areas.
Crafted from fine, narrow timber sections and designed for graceful vertical movement, Georgian sashes require delicate handling and traditional joinery skills during repair. Our team is well-versed in preserving their refined appearance while discreetly improving performance where possible, such as through draught-proofing or reglazing with heritage-appropriate glass.
Victorian Sash Windows (1837–1901)
During the Victorian era, advances in glass production allowed for fewer panes and more elaborate timberwork. Most Victorian sash windows feature a two-over-two layout, with heavier, more decorative frames and mouldings.
These windows are common in terraced and semi-detached homes throughout London and often include ornate horns and detailing. When repairing Victorian sashes, we carefully match the profile and style of original components, ensuring every repair complements the rich architectural features of the property.
Edwardian Sash Windows (1901–1914)
Edwardian sash windows reflect a blend of earlier styles with a touch of grandeur and spaciousness. You’ll often see larger panes with a mix of multi-pane upper sashes and single-pane lower sashes – such as the classic six-over-two design.
These windows were commonly installed in wide-fronted homes with intricate timber surrounds and deep box frames. Our approach to Edwardian sash repair respects their balance of form and function, restoring their smooth operation and clean aesthetics while addressing issues like timber decay, poor insulation, or failed glazing.
Modern Sliding Sash Windows
We also repair and maintain modern versions of the traditional sash window, including those constructed from timber, uPVC, or aluminium. Whether installed in new-builds or as replacements in older properties, modern sliding sashes still require regular upkeep to perform at their best.
Our team can assist with re-cording, draught-proofing, glazing issues, and functional repairs, all while ensuring any work carried out blends seamlessly with the existing style of your property.
Sash Window Repairs Services
Professional, Period-Sensitive Repairs for Homes and Commercial Properties
At GC Doors, we specialise in the repair and restoration of sliding sash windows across London and the surrounding areas. Whether you’re managing a heritage-listed building or simply want to extend the life of your original timber windows, our team provides expert, tailored solutions that improve performance without compromising on character.
Mechanical Repairs
We address a wide range of functional issues to get your sash windows sliding smoothly again. This includes rebalancing and reweighting sashes, replacing broken or frayed cords, repairing faulty pulleys, and correcting jammed or misaligned sashes.
Whether the problem is minor or more complex, we restore full movement and safety to your windows.
Timber Repairs
Timber decay is common in period properties. We carry out skilled repairs to rotten or damaged sills, sashes, and frames, using traditional joinery techniques and durable hardwoods where needed.
This may include splicing in new sections, full sill or bottom rail replacement, and the restoration of decorative features like horns and mouldings to match the original design.
Security and Hardware Upgrades
We upgrade locks, catches, restrictors, and lifting hardware to ensure your sash windows are safe, secure, and compliant with modern standards.
Whether you’re looking to replace worn-out parts or improve overall security, we’ll recommend hardware that suits both your needs and the style of your property.
Glazing Repairs and Replacement
Cracked or loose panes, failed seals, and outdated glass can all affect performance and appearance.
We replace broken or inefficient glazing with clear, toughened, laminated or heritage glass options, ensuring improved durability and energy efficiency without detracting from the window’s original look.
Draught-Proofing and Energy Efficiency
To help improve the comfort and efficiency of your property, we offer professional draught-proofing services. We install discreet brush seals and carry out precision adjustments to eliminate rattling, block cold draughts, and reduce noise.
Where appropriate, we can also retrofit slimline double-glazed sashes into your existing frames, offering enhanced insulation with minimal impact on appearance.
Surface Preparation and Finishing
A clean, well-finished sash window not only looks better but lasts longer. We offer complete refurbishment services, including paint stripping, sanding, priming, and repainting using breathable, high-quality finishes.
Where staining or polishing is preferred, we colour-match and restore timber surfaces to a consistent and polished standard.
Upgrade Options Available
Combining Traditional Style with Modern Performance
While many sash windows can be repaired and restored, some may be too damaged for practical repair—or you may simply want to improve how your windows perform in terms of energy efficiency, soundproofing, or ease of use. At GC Doors, we offer a range of carefully considered upgrade options that preserve the visual integrity of your property while enhancing comfort and functionality for everyday living.
Custom-Built Timber Sash Replacements
When the original sashes are beyond repair, we provide beautifully crafted timber replacements made to measure. Each sash is designed to replicate the original proportions, mouldings, and architectural features, ensuring it blends seamlessly with the rest of your property.
Whether you require one sash or a full set, our replacements are constructed using durable, sustainably sourced hardwoods and traditional joinery techniques, offering long-lasting quality and timeless aesthetics.
Full Window Refurbishments and Replacements
In situations where both the sashes and frames have deteriorated or where a full upgrade is the preferred route, we offer complete window refurbishment and replacement services.
Our full replacements are designed to mirror the original window style with absolute precision while integrating modern materials, high-performance glazing, and improved security features. Whether you’re undertaking a property renovation or future-proofing your home, we’ll deliver a finished product that elevates both function and appearance.
Professional Sash Window Repair Services in London
Schedule an Inspection
Before starting any job involving the installation, repair, or upgrade of windows and doors, we perform a thorough initial inspection visit. This preliminary step is fundamental to ensuring that each project is executed smoothly and efficiently.
An initial inspection visit provides a critical foundation, allowing us to gather essential information, identify potential issues, and develop a comprehensive plan tailored to your specific needs. Inspection Visits are more than just a formality; they are key to ensuring a well-planned and tailored approach.
Our Customer Promise
Your trust means everything to us — and we work hard to earn it, keep it, and honour it in everything we do. That’s our promise.
At GC Doors, we don’t just supply, install and repair windows and doors — we create experiences that are smooth, reliable, and built on trust. From first enquiry to final sign-off, we’re committed to making your journey with us as straightforward and stress-free as possible.
We understand that every project, whether large or small, represents a meaningful investment. That’s why we treat every customer with respect, listen carefully to your needs, and tailor our approach to meet your goals.
Clear and Honest Communication
We believe in transparency from day one. You’ll always know what to expect — from timelines and pricing to next steps and project updates. We keep you informed at every stage and are always available to answer questions, offer guidance, and provide honest advice.
Professionalism at Every Step
Our team shows up on time, treats your space with care, and works efficiently to get the job done right. We hold ourselves to high standards — not just in our work, but in how we carry ourselves, how we communicate, and how we follow through.
Tailored Advice and Smart Solutions
We take the time to understand your needs and recommend the best products and approaches to suit your space, style and budget. Whether you’re after sleek Sicilian aluminium frames or a reliable repair, we’ll help you make informed decisions with confidence.
Precision and Quality Craftsmanship
Every detail matters. From the accuracy of our measurements to the finish of each installation, we take pride in delivering results that not only look great but perform exceptionally for years to come.
No Surprises – Just Fair, Transparent Pricing
We provide clear, detailed estimates with no hidden costs. We respect your budget and work with you to find the right balance between quality, performance, and affordability.
Ongoing Support and Aftercare
Our service doesn’t end when the job is done. If you have a question, concern, or need support after installation, we’re just a call away. We stand behind our work and are committed to your long-term satisfaction.
Reviews
Leading experts in window and door installation and repairs in London and surrounding areas — but don’t just take our word for it. Read our reviews from satisfied customers who trust us for their window and door installations and repairs. We are committed to providing quality service and ensuring your home or business is secure, functional, and aesthetically enhanced.