How we approach skylight replacement in Derry/Londonderry
For Derry/Londonderry homes and buildings we offer skylight replacement: replacing tired domes and failed glass with a modern rooflight. We measure first, specify to the opening and confirm any planning or building-control points before quoting.
Wind and rain off the Atlantic make upstand and flashing details important on Northern Irish roofs. Think of skylight replacement for yellowed domes, misted glass and leaking roof windows.
Derry/Londonderry is the main town we list in County Londonderry; we also cover nearby Strabane and Limavady.
Choices for your Derry/Londonderry project
- Fixed to electric opening
- Roof window replacement in pitched roofs
- Upstand rebuild and insulation
- Misted glass unit replacement only
- Like-for-like size replacement
- Usually done in a day
- Often reuses the existing opening
Things we check at survey
- Enlarging the opening changes the structure and may need approval
- Upstand and roof condition decide the scope
Planning and building rules for Derry/Londonderry
In Northern Ireland, roof alterations come under Class B of the 2015 order: a rooflight facing a road must not project more than 15 cm and must sit at least 0.5 m from the ridge, eaves, verge and party wall. Listed buildings also need listed building consent from the council.
Northern Ireland's energy rules assess rooflight U-values in the vertical position — unlike England and Wales — and expect 1.6 W/m²K or Band C for replacements. Extensions follow a 25% glazing allowance in Technical Booklet F1.
See our building regulations guide for U-values, glazing limits and self-certification.
What does skylight replacement cost in Derry/Londonderry?
The ranges below are typical for straightforward jobs; your fixed price follows a survey of your roof.
| Option | Guide price inc VAT | Ex VAT |
|---|---|---|
| Replacement with upstand rebuild and opening unit | £2,995 – £4,795 | £2,495 – £3,995 |
| Dome to flat glass upgrade Typical | £1,915 – £2,995 | £1,595 – £2,495 |
| Like-for-like glass rooflight | £1,555 – £2,155 | £1,295 – £1,795 |
From enquiry to finished job
- Get in touch. Use the form, WhatsApp or the guide-price tool with your Derry/Londonderry address.
- Survey. We measure the opening, check the roof build-up and agree the options.
- Agree the quote. You approve the specification and price before anything is ordered.
- Fitting and handover. We install, clean down and leave product and warranty documents.
Neighbouring towns
Related work in Derry/Londonderry
Skylight replacement in Derry/Londonderry: questions
Can I go bigger when replacing?
Possibly. Enlarging the opening means trimming joists, so we check the structure first.
Do I need building regulations approval to replace a rooflight?
Replacements in existing homes generally need to meet current thermal standards and may need notification or approval. We advise on the route for your job.
How long does a replacement take?
Usually a day for a standard rooflight on a sound upstand.
Do you offer skylight replacement in Derry/Londonderry?
Yes. We carry out skylight replacement in Derry/Londonderry and across County Londonderry. Send your postcode and we will offer a survey date when we reply.
Do I need to be at home for the survey in Derry/Londonderry?
Yes — someone needs to let us into the room below and, where possible, show us how the roof is reached.
