Glass links & glass box roofs for Harpenden: the essentials
Thinking about glass links & glass box roofs in Harpenden? The short answer: frameless glass links joining old and new buildings. The longer answer depends on your roof, which is why we survey before we price.
Larger gardens in much of the South East mean deeper rear extensions, and deeper rooms need light from above rather than only from the doors. In Harpenden, as anywhere, glass links & glass box roofs are the usual choice for listed and period buildings where the old wall should stay visible.
Harpenden sits about 8 km from St Albans and 8 km from Luton, and we cover the whole AL5 postcode district and the roads in between.
What you can choose
- Solar-control and low-iron glass
- Heated glass on some systems
- Frameless or slim-framed glass
- Concealed gutters and drainage
- Frameless sliding or pivot doors
- Keeps period walls on show
- Visually light connection between buildings
What to check first
- Structural calculations are part of the design
- Listed building consent or planning permission is commonly needed
Planning, building control and Harpenden
Most rooflights on English houses do not need planning permission, provided they keep within 150 mm of the roof surface and below the ridge line. Listed buildings need listed building consent, flats have no householder permitted development rights, and an Article 4 direction can remove the rights in some conservation areas.
For English homes the energy rules ask for rooflights of 2.2 W/m²K or better and roof windows of 1.4 W/m²K (or WER Band B); most modern double glazed units meet both. The Future Homes and Buildings Standards, published in March 2026, apply from 24 March 2027 and keep the 2.2 W/m²K limit for rooflights.
See our building regulations guide for U-values, glazing limits and self-certification.
What do glass links & glass box roofs cost in Harpenden?
Guide prices for glass links & glass box roofs in Harpenden are the same as anywhere we work — what changes the price is the job: access, structure, scaffold and finishing.
| 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
- Tell us what you have. Send the AL5 postcode, a rough size and a couple of photos.
- Free site visit. For new installs we survey free, measure and confirm the roof detail.
- Written price. You receive a fixed price listing the unit, the work and the lead time.
- Fitting and handover. We install, clean down and leave product and warranty documents.
Neighbouring towns
More we do in Harpenden
Questions about glass links & glass box roofs in Harpenden
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.
How long does a link take?
Design and manufacture are the long part. Fitting is often two to five days.
Is structural glass safe?
Structural glass is laminated so it stays in place if a ply breaks. The manufacturer designs it for the loads involved.
How do I book a survey in Harpenden?
Send your postcode and, if you can, a photo of the roof and the room. We offer a survey date when we reply.
Do I need to be at home for the survey in Harpenden?
Yes — someone needs to let us into the room below and, where possible, show us how the roof is reached.
