Sliding rooflights in Derry/Londonderry: what is involved?
Our sliding rooflights service in Derry/Londonderry covers box rooflights whose glass lid slides back for walk-out roof access. Every job starts with a survey of the opening, the roof covering and the room below, and a fixed written price.
Northern Ireland has a mix of terraces, bungalows and rural farmhouses, and rooflights are a common upgrade when extending. In Derry/Londonderry, as anywhere, sliding rooflights are the usual choice for staircases that rise to a roof terrace.
Derry/Londonderry is the main town we list in County Londonderry; we also cover nearby Strabane and Limavady.
Specification options
- Electric drive with safety edge
- Double or triple glazing
- Box (glazed sides) or flat sliding lid
- Rain sensor
- Anthracite, black or RAL frames
- Replaces a dormer or stair enclosure on some roofs
- Lockable from inside
What to check first
- Electric units need a dedicated supply and commissioning
- The stair opening and headroom must meet Building Regulations
Planning and building rules for Derry/Londonderry
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. 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.
For homes in Northern Ireland, Technical Booklet F1 sets 1.6 W/m²K (or WER Band C) for replacement glazing including rooflights. New dwellings must average 1.40 W/m²K across windows, roof windows and rooflights.
Our planning guide covers each nation in more detail.
Guide prices for Derry/Londonderry
Prices below are shown including and excluding VAT. In Derry/Londonderry, as elsewhere, making good inside and access equipment are the main variables.
| Option | Guide price inc VAT | Ex VAT |
|---|---|---|
| Large box slider with electric drive | £11,995 – £20,395 | £9,995 – £16,995 |
| Standard box slider Typical | £8,995 – £13,195 | £7,495 – £10,995 |
| Flat sliding lid | £7,195 – £9,595 | £5,995 – £7,995 |
How the job runs
- Tell us what you have. Send the BT48 postcode, a rough size and a couple of photos.
- Measure and check. A surveyor visits Derry/Londonderry, measures and checks structure and access.
- 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.
Sliding rooflights near Derry/Londonderry
Related work in Derry/Londonderry
Questions about sliding rooflights in Derry/Londonderry
Is it lockable?
Yes. Units lock from inside and the drive holds the lid closed.
What if it is raining?
Fitted with a rain sensor, an electric unit closes automatically. Most also have a manual override for power cuts.
Can children open it?
Controls can be key-switched or placed out of reach. We will set the controls up to suit the household.
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.
Will I need planning permission in 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.
