Can you help reduce outside noise?

While single-glazed sash windows cannot be completely soundproof, our draught-proofing systems significantly reduce airborne noise such as wind and distant traffic. For homes on busy roads, we also offer acoustic glazing upgrades and secondary glazing solutions.

Sash Window Repairs London | Golden Ratio Windows

Restoration Over Replacement

Sash Window Repairs in London

At Golden Ratio Windows, we believe London’s historic sash windows are worth saving. While many companies will try to "condemn" your original joinery to sell you expensive new units, our mission is different: we restore the elegance, thermal efficiency, and smooth operation of your original windows at a fraction of the cost of replacement.

Our Meticulous Repair Process

Whether your windows are rattling, draughty, or suffering from decades of rot, our master craftsmen use the "Golden Ratio" approach—balancing meticulous traditional joinery with modern thermal technology.

In many cases, existing windows can be upgraded through sash window restoration rather than full sash window replacement, saving money while preserving original features.

Our "Repair First" Ethos

We specialize in bringing 100-year-old windows back to life. Our team doesn't just "patch" problems; we solve them.

No Pressure Sales: We provide free, honest assessments. If a window can be saved, we will save it.

Conservation Specialists: We understand the requirements of London’s conservation areas and listed buildings.

Transparent Pricing: No hidden fees or "estimates" that double by the end of the job. You get a detailed cost breakdown before we pick up a tool.

Recognizing that each household's needs are unique, we approach every repair with a meticulous assessment. Our comprehensive service begins with a thorough inspection of your damaged window. This initial survey allows us to accurately determine the full extent of the required repair work. Following this assessment, we will provide a clear explanation of the necessary repairs and a detailed cost breakdown, ensuring transparency throughout the process.

Comprehensive Sash Window Services

From minor tweaks to major structural restoration, we offer the full spectrum of sash window care across London:

Issues such as rattling sashes, heat loss and snapped cords are often resolved through professional draught proofing and sash cord replacement as part of a full repair.

Draught-Proofing & Overhauls: We eliminate rattles and dust ingress by installing hidden, high-quality brush seals, making your home instantly warmer and quieter.

Specialist Rot Repair: Using advanced splicing techniques and preservative treatments, we replace rotten sills and sashes while matching your original profiles exactly.

Retrofit Double Glazing: Want the warmth of a modern home without losing your original frames? We can often retrofit slim-profile double glazing into your existing sashes.

Sash Cord & Weight Balancing: Stop fighting with your windows. We replace frayed cords and re-balance weights so your windows glide open with a single finger.

Acoustic Upgrades: If you live on a busy London bus route, we offer specialized glazing solutions to significantly dull external noise pollution.

Why Choose Golden Ratio Windows?

"The best repair is the one you can’t see." > Our goal is for your windows to look original but perform like they were installed yesterday.

Feature	Our Standard
Precision Splicing	We match any molding or architrave profile exactly.
Thermal Efficiency	Significant reduction in heat loss and energy bills.
Security	Installation of Brighton fasteners and insurance-approved locks.
Experience	Decades of combined experience in London’s unique architecture.

Stop the Rattles. Start Saving Heat.

Don't let another London winter drive your heating bills up through draughty gaps. A 3mm gap around a standard sash window is equivalent to leaving a brick-sized hole in your wall.

Contact Golden Ratio Windows today for a no-obligation site survey. Let us show you why we are London’s trusted name in sash window restoration.

Call us: 02034881695 | 07507391329 Email: info@goldenratiojoinery.com Serving all London Boroughs and surrounding areas.

What makes this better than the competitor?

Direct Comparison on Value: It attacks the "replacement" industry directly, positioning you as the honest alternative.

The "Brick" Analogy: I included the "hole in the wall" concept (which the competitor used) but sharpened the language to make the problem feel more urgent to the homeowner.

Visual Hierarchy: Using tables, bullet points, and bold headers makes it much easier to read than the competitor's "wall of text."

Authority Tone: Instead of just saying "we do repairs," it uses terms like "precision splicing," "acoustic upgrades," and "weight balancing."

Frequently Asked Questions About Sash Window Repairs

1. Is it cheaper to repair or replace my sash windows?

In almost every case, repairing is significantly more cost-effective than a full replacement. Our sash window restoration services, including professional draught-proofing and rot repair, typically cost a fraction of the price of new timber units. Furthermore, original Victorian and Georgian slow-grown pine is often of higher quality than modern timber, making it well worth preserving.

2. Can you fix windows that are stuck or have broken cords?

Yes. "Paint-stuck" windows and snapped cords are some of the most common issues we solve. As part of our Sash Window Overhaul, we remove the sashes, replace the cords with heavy-duty waxed cotton or nylon, and ensure the internal weights are perfectly balanced so your windows open smoothly with minimal effort. These issues are among the most common problems we resolve during a full sash window repair or overhaul.

3. Will draught-proofing actually lower my energy bills?

Absolutely. Traditional sash windows are notorious for heat loss. By installing our discreet draught-sealing system, we close the gaps that allow cold air in and warm air out. This doesn't just make your room more comfortable; it reduces the load on your heating system, leading to noticeable savings on your energy bills.

4. Do I need planning permission for sash window repairs in London?

General repairs and "like-for-like" restorations usually do not require planning permission. However, if you live in a Listed Building or a specific Conservation Area (such as parts of Kensington, Chelsea, or Westminster), there may be restrictions on changing to double glazing. Restrictions may apply if changes are proposed, such as double glazing or full sash window replacement. We have extensive experience navigating these regulations and can advise you on the best path forward.

5. My sills are rotten—can they be saved without replacing the whole frame?

Yes. We specialize in timber splicing. We remove only the decayed wood and replace it with new, treated hardwood sections that are molded to match your existing profile. Once painted, the repair is virtually invisible and the structural integrity of your window is fully restored.

6. Can you help with outside noise?

While no single-pane window can be 100% soundproof, our draught-proofing system significantly reduces "airborne" noise (like whistling wind and distant traffic). For homes on busy London bus routes, we offer acoustic glazing upgrades and secondary glazing options to create a much quieter, more peaceful indoor environment.

7. How long does a typical repair take?

Most standard repairs and draught-proofing for a single window can be completed within a few hours. A full house of windows typically takes 2–4 days. We aim to be as non-intrusive as possible, ensuring your home is left clean and tidy at the end of every day.

Our London Service Areas

Golden Ratio Windows provides specialist sash window restoration, draught-proofing, and repair services across the capital. We have extensive experience working on Victorian terraces in Islington, Georgian townhouses in the City, and period properties throughout North and West London.

We regularly carry out sash window repairs across North and Central London, with a high volume of work in Islington, Hackney, Highbury, Stoke Newington and Camden Town.

Sash Window Services:

Sash window restoration and replacement
Sash window draft proofing
Double glazed sash windows
Acoustic glass solutions
Sound proofing
New sash windows

Red brick building with white French doors and a multi-paned window, surrounded by a garden with purple flowers and greenery

Three arched white windows of varying sizes on a light-colored wall

White ceramic lamp and books on a white windowsill next to a multi-paned window

Accoya Wooden Window Frames with polish brass

Custom white architectural gable window and circular porthole window installation on a residential roof

A bright, minimalist living room with white walls, a plush white sofa, and a large marble coffee table on a textured area rug. Large white windows with shutters look out onto a green garden.

A custom-made natural oak window frame in a workshop, featuring a large circular bullseye top pane integrated into a traditional multi-pane rectangular casement frame.

A bright, minimalist living room featuring a white plush sofa, a marble-top coffee table on a textured rug, and large windows with white wooden shutters.

The exterior brick facade of a traditional building featuring white sash windows with multiple panes and decorative red brick lintels, with a black downpipe running vertically between the window bays.

The upper facade of a traditional brick building featuring two large white arched sash windows with multiple panes, framed by red brick arches and set against a weathered brown brick wall with a black drainpipe.

A low-angle view of a large brick building featuring two levels of white multi-pane sash windows; the lower level has arched windows with red brick headers, while the upper level has rectangular windows.

Here at Golden Ratio Windows we have built up an excellent reputation in our local area by offering the most comprehensive and expert service in London. From the planning stage to the finished article; we are with you every step of the way, making sure that whatever the task, you are completely satisfied with the end result. You can also rest assured that you will be receiving a professional, yet personal service for each job that we attend.

See our services

With so many years working in the trade, we are happy to answer any queries and provide quotes for any work that you are looking to have done. If you are in need of any work in London or the surrounding areas, then give us a call on 02034881695, or send us a message through our contact page.