Glass Link Extensions

Glazed corridors and link structures connecting existing buildings to new additions — a sensitive, architect-specified solution favoured by conservation officers for heritage properties.

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Planning and Conservation Considerations

For listed buildings, a glass link extension requires listed building consent (LBC) in addition to planning permission. Both applications can typically be submitted simultaneously, and we recommend engaging with your local planning authority at pre-application stage to establish the principle of a glass link before committing to detailed design work.

Within conservation areas, a glass link must respect the special architectural and historic character that led to the area's designation. Conservation officers may request adjustments to the link's position, scale, proportions or glazing specification to ensure it sits comfortably within its context. The inherent transparency of a glass link — and its clearly contemporary character — generally makes it more acceptable than solid-walled alternatives.

We have experience working within conservation area requirements and can advise on the appropriate design approach during your initial consultation. Where required, we can recommend heritage architects and planning consultants who specialise in listed building and conservation area applications.

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Technical Specifications

Technical Specifications

Parameter Specification
Structure Minimal aluminium frame with structural silicone bonded glass
Glass Walls Double or triple glazed units, Low-E coated, argon filled
Glass Roof Laminated inner pane (safety), self-cleaning outer coating
U-Value (Walls) From 1.0 W/m²K
U-Value (Roof) From 1.0 W/m²K
Typical Width 1,200mm–3,000mm (project-specific)
Typical Length 1,500mm–10,000mm+ (project-specific)
Floor Typically stone, tile or engineered timber (by others)
Connections to Existing Minimal fixings into existing fabric, discreet lead/zinc flashings
Drainage Concealed aluminium gutter integrated into frame

Configuration Options

Glass Link Configurations

  • Straight Corridor — A linear glass passage connecting two buildings. The simplest and most common configuration, suitable for most residential and commercial applications.
  • Angled Link — A glass corridor with one or more changes of direction, accommodating buildings that are not aligned on the same axis.
  • Double-Height Link — A full two-storey glass connection, creating an atrium-like space between buildings. Dramatic for larger residential and commercial projects.
  • Enclosed Courtyard — Glass link structure enclosing a courtyard between existing buildings, creating a sheltered internal space.
  • Garden Link — Connecting the main house to a garden studio, annexe or outbuilding. Popular for home offices and guest accommodation.

Design Principles for Heritage Projects

  • The glass link should be visually subordinate to both buildings it connects
  • Maximum transparency — minimum framing and solid elements
  • Set back from principal elevations where possible
  • Roof height below the eaves line of the existing building
  • Reversible construction — fixings designed to be removable without damage to historic fabric

Glass Specifications

Glass Type Application Benefit
Low-Iron (Optiwhite) All glass link panels Maximum transparency — no green tint to distort views of historic building
Solar Control Roof panels, south-facing walls Reduces solar gain in the narrow glass corridor
Self-Cleaning Roof panels Reduces maintenance on hard-to-access overhead glazing
Acoustic Laminated Walls facing roads or public areas Sound reduction for habitable link spaces
Anti-Reflective All panels (optional) Reduces glare and reflections, maximising visual connection

Glass Specification

All glass linkages are supplied with high-performance double-glazed or laminated sealed units as standard. Upgrade options include:

  • Thermal performance — Warm-edge spacer bars, argon or krypton gas fill, triple glazing available
  • Solar control — Low solar-gain coatings for south-facing applications
  • Security — Laminated inner panes, PAS 24 tested units available
  • Acoustic — Acoustic laminated glass for road-facing or party-wall applications
  • Self-cleaning — Photocatalytic coating for hard-to-reach overhead glazing

Glass Options

All our glass linkages are available with a choice of high-performance glazing to suit your project requirements:

  • Double-glazed sealed units — standard specification for thermal efficiency
  • Triple-glazed units — enhanced thermal and acoustic performance
  • Acoustic laminated glass — for noise reduction in urban and roadside locations
  • Solar control glass — reduces heat gain and glare while maintaining natural light

We specify the optimal glass configuration for each project based on thermal performance, acoustic requirements and Building Regulations compliance.

Colours & Finishes

Colours & Finishes

Powder Coat Colours

All aluminium frame and fixing components are powder coated to order. Standard colours available from stock:

  • Anthracite Grey — RAL 7016 (most popular for contemporary projects)
  • Jet Black — RAL 9005
  • Pure White — RAL 9010
  • Traffic White — RAL 9016

Any RAL colour is available to special order, typically adding 2–3 weeks to lead time. For heritage projects, BS 4800 and NCS colours can also be matched.

Anodised Finishes

  • Silver Anodised — Natural aluminium appearance with enhanced corrosion resistance
  • Black Anodised — Deep, consistent black finish with a harder surface than powder coat
  • Bronze Anodised — Warm tone suited to traditional and heritage contexts

Structural glass framing is typically specified in minimal finishes — mill-finish anodised, satin black or anthracite grey — to keep the focus on the glass itself.

Frequently Asked Questions

Do I need planning permission for a glass link extension?

Almost certainly, yes. Glass links connect separate structures and typically require planning permission. For listed buildings, listed building consent (LBC) is also required. We recommend pre-application discussions with your local planning authority to establish the principle before investing in detailed design work. We can advise on the process during your initial consultation.

Will a glass link be approved in a conservation area?

Glass links are generally well-received by conservation officers because they create a clearly contemporary, transparent connection that does not mimic or compete with the historic building. The key principles are visual subordination, maximum transparency, minimal intervention in existing fabric and reversible construction. We have experience with conservation area applications across Surrey and London.

Can a glass link be heated and used as a habitable room?

Yes. Our glass links are specified with double or triple glazed units achieving U-values from 1.0 W/m²K, making them suitable for year-round habitable use. Underfloor heating is the most common heating solution, as it avoids the need for radiators or wall-mounted units in the glass-walled space. Ventilation can be provided through openable panels or a discreet mechanical system.

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