What does skylight replacement in Castlereagh involve?
For Castlereagh 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.
Castlereagh is around 17 km from Bangor, County Down, and we survey and fit throughout that part of County Down, including the BT5 district.
Choices for your Castlereagh project
- Dome to flat glass upgrade
- Fixed to electric opening
- Roof window replacement in pitched roofs
- 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
- Old glass and domes are disposed of responsibly
Do you need permission in Castlereagh?
Northern Ireland's householder permitted development allows rooflights within limits — no more than 15 cm projection on road-facing slopes and a 0.5 m margin from ridge, eaves and party walls. A side-facing window within 15 m of a neighbouring boundary must be obscure-glazed, and non-opening unless the opening part is more than 1.7 m above the floor.
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.
Our planning guide covers each nation in more detail.
Skylight replacement prices in Castlereagh
These are typical supply-and-fit ranges. For an address in Castlereagh, scaffold, a hoist for heavy glass, or a new structural opening can move the figure, which is why we survey first.
| 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 |
How the job runs
- Send the details. Postcode, rough size and a photo of the roof and room.
- 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.
- Fit and make good. We fit, seal, test and finish the reveal, then hand over the paperwork.
Nearby towns
Related work in Castlereagh
Questions about skylight replacement in Castlereagh
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.
Can I go bigger when replacing?
Possibly. Enlarging the opening means trimming joists, so we check the structure first.
What do you do with the old unit?
We remove it from site and recycle what can be recycled.
Is the survey in Castlereagh free?
Yes for new installations. Repair visits are charged, and we tell you the price before we book.
Will I need planning permission in Castlereagh?
Most rooflights on houses in Northern Ireland are permitted development under Class B, but not in a conservation area or on a listed building's curtilage.
