Glass links & glass box roofs for Penzance: the essentials
Glass links & glass box roofs in Penzance means frameless glass links joining old and new buildings. We cover the TR18 district and the rest of Cornwall, with a survey before any price is fixed.
Western coasts take wind-driven rain, so we pay close attention to upstand height and flashing laps on exposed roofs. In Penzance, as anywhere, glass links & glass box roofs are the usual choice for joining a period house to a new extension or annexe.
We work across Cornwall, including Penzance, and in neighbouring towns such as Camborne and Redruth. Access, parking and how the glass reaches the roof are all checked at the survey.
What you can choose
- Frameless sliding or pivot doors
- Concealed gutters and drainage
- Heated glass on some systems
- Solar-control and low-iron glass
- Frameless or slim-framed glass
- Visually light connection between buildings
- Designed around the existing building
Before you order: points to check
- Structural calculations are part of the design
- Thermal performance of large glass areas must be calculated
Do you need permission in Penzance?
English householder permitted development (Class C) normally covers rooflights that stand no more than 0.15 m proud of the roof plane and stay below the highest part of the roof. A rooflight on a side-facing slope must be obscure-glazed, and fixed shut unless the opening part is more than 1.7 m above the floor.
Building Regulations Approved Document L sets a limiting U-value of 2.2 W/m²K for new or replacement rooflights in existing homes, measured in the horizontal plane; roof windows need 1.4 W/m²K or a Band B energy rating. Replacing a rooflight or roof window can be self-certified by an installer registered with an authorised competent person scheme; otherwise building control approval is needed.
Read the planning permission guide before you commit to a design.
Guide prices for Penzance
Prices below are shown including and excluding VAT. In Penzance, as elsewhere, making good inside and access equipment are the main variables.
| Option | Guide price inc VAT | Ex VAT |
|---|---|---|
| Fully frameless link with glass beams | £20,395 – £35,995 | £16,995 – £29,995 |
| Glass roof and glazed sides Typical | £13,195 – £20,395 | £10,995 – £16,995 |
| Glass roof between existing walls | £9,595 – £13,195 | £7,995 – £10,995 |
The process, step by step
- Get in touch. Use the form, WhatsApp or the guide-price tool with your Penzance address.
- Measure and check. A surveyor visits Penzance, measures and checks structure and access.
- Written price. You receive a fixed price listing the unit, the work and the lead time.
- Installation day. Usually one day into a prepared opening, longer for new openings.
Glass links & glass box roofs near Penzance
Related work in Penzance
Common questions
How is the glass joined to the old wall?
Usually by a slim channel or flashing set into the masonry, sealed and weathered so the old wall can move without cracking the glass seal.
Who designs it?
Your architect, or we produce a survey-based design that the glass manufacturer engineers.
Can a glass link be warm enough to use all year?
With insulated glass units, solar control and good detailing, yes — though it will always be brighter and more exposed to temperature swings than a solid room.
Do I need to be at home for the survey in Penzance?
Yes — someone needs to let us into the room below and, where possible, show us how the roof is reached.
Do you fit glass links & glass box roofs in Penzance?
Yes. We survey and fit glass links & glass box roofs in Penzance and across Cornwall. Send your postcode and we will offer a survey date when we reply.
