Roof lantern upstands in Harpenden
For roof lantern upstands in Harpenden, start with the guide prices on this page, then send photos and measurements for a fixed written quote covering AL5.
Price a roof lantern upstand for Harpenden
Postcode and kerb size first, then your details. We reply with a fixed written quote.
Lantern upstands for Harpenden projects
Insulated upstands and kerbs that raise the lantern above the roof finish.
Winter daylight in Harpenden lasts about 7h 46m, against 16h 42m in midsummer. Glass in the roof makes the most of the short days, and the right glass keeps the long ones comfortable.
- Made to match the lantern's external size
- Ordered with your lantern if you wish
- Level and square for a correct fit
Delivery and fitting in Harpenden
Your quote includes delivery to Harpenden at a confirmed price, usually to the kerbside or driveway on pallets.
If you would like us to fit it, we will check fitting cover for AL5 and quote a fixed price after seeing photos or surveying.
Delivery to AL5 is standard mainland delivery, priced for your postcode and confirmed in writing before you order.
Roof lantern upstands guide prices for Harpenden
Guide prices for an insulated upstand on its own, by lantern size, including VAT:
| Lantern kerb size | Perimeter | Insulated upstand, guide |
|---|---|---|
| 1200 × 1200 mm | 4.8 m | £245£204 ex VAT |
| 1500 × 2000 mm | 7.0 m | £295£246 ex VAT |
| 1500 × 2500 mm | 8.0 m | £345£288 ex VAT |
| 1500 × 3000 mm | 9.0 m | £345£288 ex VAT |
Guide prices include VAT at 20%, upstand only, supply only. Upstands are made to match the lantern's external size; your fixed price is confirmed in writing before you order.
Planning and building regulations for Harpenden
In England, building regulations energy guidance sets a limiting U-value of 2.2 W/m²K for new and replacement rooflights in existing homes, measured horizontally.
Lanterns on permitted development extensions are part of the extension's height limits. Adding one to an existing roof is different: over 150 mm of projection can mean a planning application.
Building regulations in Harpenden are checked by your local authority building control team or a registered building control approver. Replacing a rooflight in an existing home is building work. Installers registered with a competent person scheme can self-certify; otherwise building control must be involved.
Sources: Approved Document L, GOV.UK · Planning Portal
Questions from Harpenden
Who makes the upstand weatherproof?
Your roofer, by dressing the roof membrane up the outside of the upstand. The lantern then sits over it.
Can I order a lantern before the upstand is built?
Yes, if you build the upstand to the lantern's stated external size. Many people order the lantern and upstand together so they match.
How quickly can I get a roof lantern in Harpenden?
Stock sizes are typically ready in 5–10 working days, made-to-measure in 3–4 weeks, plus delivery. Your quote gives the date for AL5.
Who checks building regulations for a lantern in Harpenden?
Your local authority building control team or a registered building control approver. For a lantern in a new extension it forms part of the extension's approval; replacements in existing homes have their own rules.