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Restored timber sash window with brass sash lifts and clean painted timber sill

Sash Window Double Glazing Upgrade in London , Westminster

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Local Area Service Serving London & Westminster
Local South London Specialists

Preserving London period properties with double glazing

Eden Sash Windows provides specialist sash window double glazing upgrades across London and the surrounding 15-mile radius. Director Charlie Burgess leads our efforts to modernise historic windows while maintaining the architectural character that defines Victorian, Georgian, and Edwardian homes. We focus on integrating A-rated, argon-filled units into your existing box frames or newly manufactured timber sashes, ensuring that the finished product satisfies strict conservation requirements while significantly boosting thermal efficiency and noise reduction.

Direct Line • South London
020 7046 0157

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Westminster

Sash Window Double Glazing Upgrade in London And Across Westminster

Ashford Banstead Borehamwood Caterham Chigwell City Of London City Of Westminster Epsom Esher Ewell Leatherhead London Sunbury-On-Thames Swanley Walton-On-Thames Warlingham Weybridge
Bespoke Sash Installation by Eden Sash Windows
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Bespoke Sash Installation

Handcrafted replacement timber sash windows manufactured to exact period profiles. Fully FENSA certified, fitted with A-rated glazing, and backed by our comprehensive 10-year guarantee.

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Sash Window Restoration by Eden Sash Windows
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Sash Window Restoration

Preserve authentic architectural joinery across Victorian and Georgian properties. We splice durable seasoned timber into decayed sills, repair box frames, and restore structural integrity.

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Draught-Proofing & Overhaul by Eden Sash Windows
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Draught-Proofing & Overhaul

Concealed perimeter brush seal systems machined directly into staff and parting beads. Eliminate rattles, block cold air, and renew sash cords and counterweights for a smooth, balanced glide.

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Why Choose Eden Sash Windows

Preserving Heritage Character With Double Glazing.

Slimline double glazed timber sash window meeting rail with brass fastener
FENSA Registered Joinery A-rated double-glazed units engineered to preserve authentic period sightlines across Westminster and London.
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How we maintain authentic sightlines in Westminster

Traditional timber sashes are often compromised by bulky modern glazing beads. Our approach uses bespoke double-glazed units specifically designed to replicate the elegant, narrow profile of original single-glazed panes. By using low-emissivity glass and warm-edge spacers, we achieve superior insulation without the visual thickness that can ruin the appearance of a period facade. This attention to detail is essential for properties within conservation areas where maintaining the correct aesthetic is a priority.

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Combining thermal efficiency with effective draught-proofing

A successful sash window upgrade involves more than just swapping the glass. To truly address heat loss and street noise, we incorporate a comprehensive draught-proofing system alongside our double-glazing installations. We machine hidden brush seals into the staff and parting beads, which effectively closes the gaps around the sash while ensuring the windows continue to glide smoothly. This combination eliminates rattles and cold spots, making your home noticeably more comfortable throughout the year.

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Do you need planning permission for sash upgrades?

Many homeowners in London are concerned about local planning authority restrictions when improving their windows. While replacing an entire frame may trigger requirements for planning consent or compliance with Article 4 directions, upgrading existing timber sashes with double-glazed units is often a more straightforward process. We advise on the specific conservation requirements for your property, ensuring that all work meets local standards. As a FENSA-registered specialist, we also provide the necessary documentation for your window installations.

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Our professional commitment to your home

We operate with a commitment to quality joinery and transparent service. Every project begins with a physical assessment of your frames, weights, and sills, followed by a clear, fixed written quotation. We take pride in our clean working practices and our ability to salvage existing timber whenever possible through skilled splicing and repair. Every new bespoke timber window installation we perform is covered by a 10-year guarantee to provide you with lasting peace of mind.

Heritage Joinery Standards

Why Choose Eden Sash Windows?

Directed by Charlie Burgess, we deliver bespoke double glazing upgrades and timber sash restorations that eliminate draughts and traffic noise while safeguarding authentic period sightlines across Westminster and London.

Westminster & London Heritage

Deep practical knowledge of Georgian townhouses and Victorian terraces, managing conservation requirements and sensitive street-facing facades with precision.

Authentic Double Glazing

Bespoke double-glazed units incorporating low-E glass, argon gas fill, and warm-edge spacers to maintain delicate historic glazing bars and true putty lines.

Box Frame Preservation

We preserve original timber box frames behind brick reveals, splicing rotted sills with seasoned timber to retain structural character and protect interior plasterwork.

FENSA Registered & Guaranteed

Every bespoke installation is FENSA certified, covered by £2m public liability insurance, and backed by a comprehensive 10-year guarantee on new timber windows.

Restored white timber sash window with brass sash lifts and slimline double glazing in a period home

Book your sash window survey today

If you are ready to improve the comfort and efficiency of your home while respecting its heritage, we are here to help. Whether you are dealing with misted glass or simply looking to reduce your energy bills, we provide expert guidance tailored to your specific window style. Book your free sash window survey with Charlie Burgess today by calling 020 7046 0157 or requesting a written quote online for your property in London.

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Sash window installation Services Across South London: 020 7046 0157

Local Reputation

Client Feedback on Our Timber Sash Joinery

Read genuine homeowner experiences across Battersea, Wandsworth, Clapham, and South West London. Charlie Burgess oversees every timber sash restoration, draught-proofing project, and bespoke FENSA-certified installation to ensure historical fidelity and thermal performance.

Verified Client

"Charlie replaced some of the wooden frames in our porch which were rotten. He did an excellent job and we are extremely happy with the result. He ands his apprentice were very friendly polite and tidy. It was difficult conditions as it was raining but they were great. Would definitely recommend"

Jane Scoon

Google Verified Review
Verified Client

"We are very happy with Eden Joinery's work: we had a completely new sash fitted, and four sashes fitted into our existing frames. Our windows look fantastic - and no more draughts! Terry and son were courteous, tidy, with competitive rates, and took obvious pride in their work. They went the extra mile to fix a problem with one of our frames, and all windows were finished to a high standard. We would not hesitate to recommend them."

Julie Clayton

Google Verified Review
Verified Client

"Terry and his team did a great job fitting two new sash windows in our house. The windows and work done was all to a high standard, on time and reasonably priced."

Angela Sherratt

Google Verified Review
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Double Glazing & Restoration Guidance

Frequently Asked Questions

Practical guidance from Charlie Burgess on upgrading your timber sashes with double glazing, satisfying conservation standards, and draught-proofing period homes across South London.

Can you double glaze my existing original sash boxes?

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In many cases, yes. If your original box frames are in good structural condition, we can manufacture new timber sashes fitted with double glazing that sit directly into the existing frames. This avoids the need for major structural work and preserves your interior architraves and plasterwork. During the survey, Charlie will check for any rot in the sills or pulley stiles that may need splicing before the new sashes are fitted.

Will I need planning permission for double glazing in a conservation area?

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Like-for-like timber repairs often do not require formal planning permission, but installing double glazing in a conservation area or a listed building can be more complex. Many councils in Wandsworth, Lambeth, and Richmond now look favourably on timber units that match the original profiles. We can advise you on the specific requirements for your local authority to ensure your upgrade is compliant.

How much of a difference does draught proofing make?

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Draught proofing is one of the most cost-effective ways to improve a period home. By installing hidden brush seals, we close the gaps that allow heat to escape and cold air to whistle through. When combined with our double glazing, it can significantly lower your heating bills and almost entirely eliminate the rattles common with older Victorian windows.

What is the benefit of double-glazed units over standard double glazing?

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Standard double-glazed units are typically 20mm to 24mm thick, which requires very chunky timber frames that look out of place on a period property. Our double-glazed units use advanced thermal technology to provide similar insulation levels in a much thinner profile. This allows us to maintain the authentic "sightlines" of your windows, ensuring they look like the original single-glazed sashes while providing modern A-rated thermal performance.

How long does the installation process take?

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The timeline depends on the number of windows, but a standard room can often be completed in a day or two. We work cleanly and efficiently, ensuring your home is secure at the end of every working day. Because we are based in Battersea, we are local to South West London and Surrey, which allows us to manage logistics and site visits effectively without long delays.

Still have questions? Speak directly with our South London Sash window installation team today.

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Service Territory

Specialist Timber Sash Window Services Across South West London & Surrey

Based in Battersea (SW8), Director Charlie Burgess delivers bespoke timber sash window installation, heritage restoration, draught-proofing, and double glazing within a 15-mile radius across South West London and Surrey.

Key Local Catchment Areas

Battersea & Wandsworth

  • SW8 & SW11: Battersea Park, Shaftesbury Estate
  • SW4 & SW12: Clapham Common, Balham, Nightingale
  • SW18: Wandsworth Town, Southfields, Earlsfield
  • SW17: Tooting Bec, Tooting Broadway, Furzedown
  • SW15: Putney, Roehampton, Putney Heath
  • + All Wandsworth Article 4 conservation zones

Lambeth, Richmond & Surrey

  • Lambeth: Kennington, Stockwell & Brixton
  • Richmond: Richmond Green, Kew & Twickenham
  • Merton: Wimbledon Village, Raynes Park
  • Kingston: Surbiton, Coombe & New Malden
  • Surrey: Esher, Thames Ditton, Long Ditton
  • + All areas within 15 miles of SW8 base

Heritage Joinery Standards

  • Authentic Victorian & Georgian sightlines
  • A-rated double-glazed units
  • Concealed perimeter draught-proofing
  • Durable sill splicing & box frame restoration
  • FENSA registered with a 10-year guarantee
Detailed Sash Survey

Book with Charlie Burgess

Arrange a comprehensive inspection written quotation for sash repair, restoration, or bespoke installation.

Call: +442070460157

Working cleanly within Controlled Parking Zones and conservation areas across South West London and Surrey. For emergency sash repairs or broken glass, call 020 7046 0157 (Mon–Sat, 08:00–18:00).

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London

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Phone Directly 020 7046 0157
Email Inquiry info@edensashwindows.co.uk