How we approach flat rooflights in Carrickfergus
For Carrickfergus homes and buildings we offer flat rooflights: fixed double or triple glazed rooflights for flat roofs and extensions. We measure first, specify to the opening and confirm any planning or building-control points before quoting.
Many Northern Irish homes have later flat-roofed kitchen extensions where an old dome can be swapped for glass. Think of flat rooflights for kitchen extensions, side returns and flat-roofed back rooms.
From Carrickfergus to Newtownabbey, Bangor, County Down and Belfast, the same survey-first process applies: measure, specify, fix the price, then fit.
Specification options
- Integral or fitted blinds
- Double or triple glazing
- Plastered or lined internal reveal
- Insulated kerb or timber upstand built to suit
- Rain sensor if paired with an opening unit
- Slim sightlines from inside — mostly glass, little frame
- Pairs with an opening unit where you also need ventilation
Things we check at survey
- Rooflights count toward glazing in an extension, which matters for Building Regulations energy and overheating rules
- Needs a properly formed upstand — usually at least 150 mm above the finished roof surface (check the manufacturer's figure)
Consents for flat rooflights in Carrickfergus
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. 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.
Technical Booklet F1 (2022) asks for replacement windows and rooflights in existing homes to reach WER Band C or a U-value of 1.6 W/m²K, assessed in the vertical position. Extensions follow a 25% glazing allowance in Technical Booklet F1.
Read the planning permission guide before you commit to a design.
Flat rooflights prices in Carrickfergus
The ranges below are typical for straightforward jobs; your fixed price follows a survey of your roof.
| Option | Guide price inc VAT | Ex VAT |
|---|---|---|
| Large or triple glazed (1500 × 2500 mm and up) | £2,395 – £4,195 | £1,995 – £3,495 |
| Mid-size double glazed (1000 × 2000 mm) Typical | £1,675 – £2,395 | £1,395 – £1,995 |
| Small double glazed (up to 1000 × 1000 mm) | £1,195 – £1,795 | £995 – £1,495 |
The process, step by step
- Send the details. Postcode, rough size and a photo of the roof and room.
- 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.
- Fit and make good. We fit, seal, test and finish the reveal, then hand over the paperwork.
Flat rooflights near Carrickfergus
More we do in Carrickfergus
Common questions
Can a flat rooflight be walked on?
Not unless it is designed as a walk-on unit with structural laminated glass. A standard flat rooflight is for light only — if the roof is used as a terrace, choose a walk-on rooflight instead.
Do flat rooflights leak?
A well-fitted flat rooflight should not leak. Leaks almost always come from the upstand or membrane detailing, not the glass unit, which is why the upstand height and the way the roof covering is dressed up and under the frame matter more than the brand.
Will it make the room too hot?
A big unglazed-to-sky area can add solar gain in summer. Solar-control glass, a blind, or pairing a fixed unit with an opening one keeps it comfortable.
Do I need to be at home for the survey in Carrickfergus?
Yes — someone needs to let us into the room below and, where possible, show us how the roof is reached.
How do I book a survey in Carrickfergus?
Send your postcode and, if you can, a photo of the roof and the room. We offer a survey date when we reply.
