Connecting a period property to a new extension is one of the most delicate challenges in residential architecture. The junction between old and new must be handled with care — preserving the integrity of the original building while creating a functional, light-filled link that serves both structures.
In Hertfordshire, where Victorian villas, Edwardian semis, and Georgian farmhouses are common, glass links have become the preferred solution for architects and homeowners who want to modernise without compromising character. A well-designed glass link reads as a transparent corridor — barely there from the garden, yet transformative from within.
Why choose a glass link
Traditional connecting structures — brick passageways, timber-clad links, or solid masonry — create a permanent visual break between old and new. Glass links offer an alternative:
- Preserve original elevations — the period facade remains untouched and fully visible from the garden.
- Maximise daylight — the link itself becomes a light-filled transition rather than a dark corridor.
- Minimise visual mass — slim framing and structural glass reduce the apparent size of the connection.
- Satisfy conservation officers — glass links are often viewed favourably in listed building and conservation area applications because they are clearly contemporary and reversible in character.
We design and install glass links as part of our structural glass installations service.
Design considerations for period properties
Period properties in Hertfordshire present specific constraints that influence glass link design:
- Wall thickness — Victorian and Edwardian walls are often 230 mm or more, requiring careful detailing at the junction between the glass channel and existing masonry.
- Floor levels — the main house and extension may sit at different finished floor levels, requiring ramps, steps, or level changes within the link.
- Roof form — the link roof must relate to both the existing eaves line and the new extension roof. Flat glass roofs and pitched glass roofs each have advantages.
- Drainage — water must be managed at the junction between old and new roof structures without compromising historic fabric.
We survey on site and coordinate with your architect or builder to resolve these details before manufacture.
Planning and listed building consent
Glass links in Hertfordshire frequently require planning permission or listed building consent:
- Conservation areas — common in St Albans, Berkhamsted, Hitchin, and Ware. Applications must demonstrate that the link preserves or enhances the character of the conservation area.
- Listed buildings — any alteration visible from outside typically requires listed building consent. Glass links are often approved because they are clearly distinguishable from the historic fabric.
- Permitted development — may apply where the link connects to a rear extension that itself falls within permitted development limits, but this is project-specific.
We advise on proportion, materials, and sight lines to support your planning application, though we do not provide planning consultancy.
A glass link should read as a deliberate contemporary insertion — not an attempt to mimic the period architecture it connects.
Structural and weather performance
Glass links must perform as habitable space, not just a visual connection:
- Thermal performance — double glazed units with U-values meeting current Building Regulations. Thermally broken channels at floor and ceiling prevent cold bridging.
- Weather tightness — structural silicone bonding and compression seals at junctions with existing walls.
- Condensation control — adequate ventilation and warm-edge spacers reduce internal condensation in winter.
- Security — laminated inner panes and multi-point locking on any door leaves within the link.
These specifications align with our broader bespoke architectural glazing standards.
Pairing with other glazing
Glass links work best as part of a coordinated scheme:
- Bi-fold or sliding doors in the new extension — creating a continuous indoor-outdoor connection beyond the link. Explore bi-fold and sliding doors.
- Roof lanterns — in the extension beyond the link, bringing overhead light into the new living space. See glass roofs and lanterns.
- Window replacement — upgrading windows in the period property to match the performance and aesthetic of the new glazing. View window and door replacement.
Browse our gallery for glass link projects across Hertfordshire.
Book a consultation
Planning a glass link for your period property? Book a glazing consultation and we will assess the connection, advise on design options, and outline the specification process.
