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Keep your original Victorian or Edwardian leaded lights. We encapsulate your stained glass inside energy-efficient double glazing — preserving heritage character with modern performance.
No obligation · Free site survey · Reply within hours
Stained glass encapsulation London is the process of carefully removing your original leaded or stained glass panel, restoring it in our North London workshop, and permanently sealing it inside a new double-glazed unit. The result is a thermally efficient, draught-free window that looks exactly like the original — because it is the original, just protected within modern glazing.
London's period housing stock — Victorian terraces, Edwardian semis, Georgian townhouses — is filled with beautiful leadlight windows that homeowners are reluctant to lose. Encapsulating stained glass double glazing is the only method that lets you keep every piece of original heritage glass while eliminating cold draughts, condensation, and heat loss. Golden Ratio Windows have been carrying out stained glass services across London for over 15 years.
Your original Victorian or Edwardian stained glass remains 100% intact. No reproduction, no substitute — the real thing, protected forever inside modern glazing.
Encapsulated stained glass windows eliminate draughts and heat loss. The sealed double-glazed unit provides a significant improvement in energy efficiency and comfort.
The air gap inside the double-glazed unit also reduces external noise — a major benefit in London's busy streets and urban environments.
We assess your stained glass panels, check for damaged leadwork or broken panes, and provide a free, transparent quote.
Your panel is removed and taken to our London workshop. Damaged lead came is re-soldered, broken glass replaced with period-matched pieces.
The restored panel is sealed inside a new double-glazed unit using warm-edge spacer bar technology, creating an airtight, thermally broken unit.
The finished unit is reinstalled into your sash window or door frame. In most cases the whole process takes just one day on site.
The difference between an encapsulated leadlight and a single-glazed original is invisible to the eye. What is very visible is the improvement in comfort — no more rattling frames in the wind, no cold spots beside the glass in winter, no condensation pooling on the sill each morning.
For period properties across London, stained glass encapsulation is often the single most effective upgrade you can make — combining heritage preservation with genuine energy savings, all without touching the original character of your home.
London has more conservation areas than any other city in the UK — over 1,000 designated zones where altering the external appearance of a property can require planning permission. In many of these areas, removing original stained glass and replacing it with plain double glazing would be refused.
Stained glass encapsulation is widely accepted by local planning authorities precisely because the original glazing is retained entirely. The Historic England guidance on stained glass conservation supports repair and encapsulation over replacement wherever possible. We have completed encapsulation projects in conservation areas across Camden, Westminster, Kensington, Islington, and Hackney without any planning complications.
If you are unsure whether your property requires permission, we can advise. The Glass and Glazing Federation also publishes guidance on glazing in listed buildings and conservation areas.
Stained glass encapsulation prices in London vary depending on the size and number of panels, the complexity of the leadwork, and the condition of the original glass. A panel requiring significant lead restoration before encapsulation will cost more than one in good repair.
£100–£300
Fan lights, small sidelights, narrow transom windows. Single-panel encapsulation with minimal restoration required.
£300–£500
Sash window top lights, door panels, standard leadlight windows. Includes assessment, restoration where needed, and full encapsulation.
POA
Large panels, heavily damaged leadwork, multiple windows, entrance doors with extensive stained glass. Quoted individually after survey.
💡 The most accurate way to price stained glass encapsulation is to see the panels in person. Send us a photo of your windows via email or use the enquiry form below and we will give you an indicative cost within one business day — usually much faster.
A selection of stained glass encapsulation work carried out for London homeowners by our heritage glass team.
Stained glass encapsulation is the process of restoring your original leaded or stained glass panel and permanently sealing it inside a new double-glazed unit. The heritage glass remains completely visible and untouched on both sides, while the sealed air gap between the panes provides modern thermal and acoustic insulation.
Stained glass encapsulation costs in London typically range from £300–£900 per panel, depending on the size, complexity of the leadwork, and condition of the original glass. Panels requiring restoration before encapsulation will cost more than those in good condition. We provide free, no-obligation quotes after a site visit or review of photos sent by email.
Yes — encapsulation is specifically designed for this. Your original Victorian or Edwardian stained glass panel is carefully removed, restored in our London workshop, and then permanently sealed inside a new double-glazed unit. The result looks identical to the original from both inside and outside, with the added benefit of improved energy efficiency.
Yes. Because the original glass and leadwork remain intact and fully visible, encapsulation is widely accepted by London local authorities as a conservation-friendly solution. It is frequently the preferred method in conservation areas across Camden, Westminster, Kensington, Islington, and Hackney, where replacing original glazing would require planning permission or be refused outright.
The process typically takes 2–4 weeks from survey to installation. The panel is removed, any damaged leadwork or broken pieces are repaired in our workshop, the unit is built around it, and it is reinstalled — usually in a single visit. Heavily damaged panels requiring significant restoration may take slightly longer.
Encapsulation preserves your original heritage glass by sealing it inside a new double-glazed unit — nothing is replaced or discarded. Replacement means removing the old glass entirely and fitting a new reproduction. Encapsulation is always preferable for period properties because it retains the authentic patina, hand-made glass irregularities, and historical character that reproductions cannot replicate.
Send us a photo of your stained glass windows or doors. We'll review the panels and come back to you with an honest assessment and free, no-obligation quote for stained glass encapsulation in London.
218 Hornsey Road, London, N7 7LL
Fill in the form and we'll get back to you within one business day — usually much sooner.
