Call Us: 020 7046 0157
Rotten timber sash window sill and corner box frame damage being cleared for repair
Timber Sash Window Restoration Specialists

Rotten Sill Repair & Splice Joinery Across
Westminster & South West London

Where original Georgian and Victorian timber has decayed, we cut away wet rot and splice in durable Accoya sills rather than tearing out historic box frames. Led by Charlie Burgess, preserving your original brick reveals, plasterwork, and authentic profiles.

Durable Accoya Splices
FENSA Registered Specialist
£2m Public Liability
★ 10
10-year guarantee on all new bespoke timber installations

Book a Sash Survey & Quote

Speak directly with Charlie Burgess to arrange a thorough on-site survey and a clear, fixed written quotation for your timber sash windows.

1 Timber, sill, pulley, and box frame inspection
2 Heritage-compliant repair or replacement plan
3 Fixed quotation with no hidden costs
Call Charlie Burgess +442070460157
→
55 Emu Road, London, SW8 3PQ Find Us

Emergency Broken Glass, Dropped Sash, or Snapped Cord?

Same-day emergency timber sash securing and glazing repairs available across Westminster and South West London (Mon–Sat, 08:00–18:00).

Call for Emergency Repair
Local South London Specialists

Specialist Rotten Sash Window Sill Repair in Westminster

Decaying timber sills are a common challenge for owners of period properties across Westminster and wider London. Over time, exposure to the elements and the natural wicking of moisture into end-grain timber can leave window sills soft, brittle, or completely hollow. At Eden Sash Windows, Director Charlie Burgess leads a focus on repair over total replacement. We believe that original box frames often hold decades of life still, and we use precise timber splicing to restore structural integrity without the need to disturb interior plaster or historic masonry.

Direct Line • South London
020 7046 0157

Get An Estimate

Complete the form below for a free quote.

No Obligation • 100% Free Survey
Westminster Sill Restoration

Preserving Original Joinery With Durable Accoya Splices.

Spliced timber repair on a period sash window box frame and sill
Conservation-Compliant Repairs Rebuilding decayed timber sills and lower box frames without disturbing historic interior plaster.
01

How we use timber splicing to restore decayed frames

Our approach to sill restoration relies on a technical process known as timber splicing. Rather than patching rot with temporary fillers, we carefully remove the compromised sections of the sill and the base of the pulley stiles. We then install a replacement section crafted from seasoned hardwood or high-performance Accoya, a material chosen for its exceptional stability and resistance to decay. By using marine-grade epoxy resins that bond with the existing timber, we create a seamless, weather-proof join that expands and contracts alongside your original window frame. This method is far superior to standard fillers, which typically crack and shrink under the pressure of the London climate.

02

Conservation area compliance and heritage preservation

For residents in Westminster conservation areas or those living in listed properties, the requirement for like-for-like repairs is often a priority. Because our restoration work focuses on maintaining the original box frame and sightlines, it is typically permitted under standard conservation guidelines. By choosing to splice and repair, you preserve the authentic period character of your home while effectively sealing the joinery against water ingress. Our work includes re-instating traditional putty lines and ensuring that all profiles match the surrounding architecture, keeping your property compliant with planning requirements.

03

Can a rotten sill be repaired instead of replacing the window?

In the vast majority of cases, yes. Sills and the lower sections of the box frame are the most vulnerable parts of any sash window, yet they rarely dictate the health of the entire unit. We conduct a thorough physical survey to assess the depth of the decay, checking the weight pockets and sills for structural stability. If the frame remains sound, splicing allows us to restore the window to full working order with a 10-year guarantee on our new timber work. This keeps your costs manageable while avoiding the waste and logistical disruption of full window replacement.

04

Arrange your sash window survey with Charlie Burgess

We are FENSA registered and hold 2m in public liability insurance, providing full peace of mind for all your sash restoration needs. Every project begins with a detailed assessment to identify the root cause of the rot, whether it stems from blocked drainage or failed paint systems. Once the work is complete, your windows will be correctly balanced, draught-proofed, and primed for a durable finish. If a rotten sill has led to a dropped sash, stuck pulley, or broken glass, we are also available for same-day emergency repairs to secure your home. Book your detailed sash sill survey with Charlie Burgess today. Call 020 7046 0157 or request a written quotation online.

Heritage Joinery Standards

Why Choose Eden Sash Windows?

Led by Charlie Burgess, we provide architectural-grade timber sash repairs across Westminster and London, restoring decayed sills through authentic timber splicing rather than unnecessary box frame replacement.

Westminster Heritage Insight

Deep practical expertise in Georgian townhouses and Victorian terraces across Westminster, navigating strict conservation guidelines and protecting original brick reveals.

Durable Timber Splicing

We excise rotten wood and splice in rot-resistant Accoya and seasoned hardwood, preserving your original box frames and avoiding disturbance to interior plaster or shutters.

FENSA Registered & Insured

FENSA registered with £2m public liability insurance, paired with an industry-backed 10-year guarantee on all newly manufactured timber sash window installations.

Survey Quotations

Clear, honest advice directly from Charlie Burgess. We provide thorough assessments and fixed written joinery quotes before any restoration work commences.

Restored timber sash window with brass sash lifts and clean painted timber sill
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Sash window installation Services Across South London: 020 7046 0157

Westminster Coverage

Rotten Sill Repair in London And Across Westminster

Select your local area or district below to arrange an on-site sash window survey with Charlie Burgess and review specialist timber sill repair options.

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
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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Rotten Sill Restoration Inquiries

Rotten Sash Window Sill Repair FAQs

Clear guidance from Charlie Burgess on durable timber sill splicing, box frame repairs, and conservation compliance for period properties across South London.

Why do my sash window sills keep rotting despite being painted?

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Sills usually rot because of "ponding," where water sits on the flat surface rather than running off. If the paint develops even a tiny hairline crack, moisture gets trapped against the timber. In many London properties, previous repairs may have used poor-quality softwoods or standard fillers that trap moisture rather than sealing it out. We use durable timbers like Accoya and specialist resins to prevent this cycle of decay.

Can a rotten sill be repaired without replacing the whole window?

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In the vast majority of cases, yes. As long as the upper parts of the box frame are structurally sound, we can perform a sill splice. This involves removing the bottom 6 to 10 inches of the frame and the entire sill, then fitting new timber. It is a much more cost-effective and less intrusive way to maintain your period home compared to a full replacement.

What materials do you use for sill repairs in London period homes?

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We prefer to use Accoya or high-quality seasoned hardwood for sill replacements. Accoya is particularly effective for properties in areas like Westminster or Richmond because it is incredibly stable and does not rot. We finish the repair with traditional putty lines and professional-grade primers to ensure the new timber is fully weather-proofed before we leave the site.

Will repairing the sill help with draughts and street noise?

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A rotten sill often creates gaps where the bottom rail of the sash meets the frame, letting in cold air and noise from busy South West London roads. While we are repairing the sill, we can also install our draught-proofing system. This involves machining hidden brush seals into the beads, which closes the gaps and makes your Victorian or Georgian home much quieter and warmer.

Do I need planning permission for sill repairs in a conservation area?

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General repairs and timber splicing are usually considered "like-for-like" maintenance and do not typically require planning permission, even in strict Article 4 areas of Wandsworth or Lambeth. However, if you are looking to upgrade to double glazing at the same time, Charlie Burgess can advise you on local heritage requirements to make sure your windows remain compliant with conservation guidelines.

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).

Interactive Coverage Map

Durable Timber Splicing & Sill Repairs

Book Your Detailed Sash Survey
Specialist Rotten Sill Restoration & Sash window installation in South London

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