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RooflightInstallers.co.uk
County Down · Northern Ireland

New rooflight in an existing roof in County Down

We cover 16 postcode districts across County Down, and we fit rooflights in all of them. The work itself does not change from one district to the next. A new rooflight still needs a correctly sized opening, an upstand or flashing to suit the roof, and sealing that matches the covering. What does change is access: terraced streets, long gardens, steep pitches, tight parking. We price that honestly in the written quote rather than averaging it out across every job.

Guide prices in County Down

Small fixed unit

£2,295 – £3,345including VAT at 20%

Opening cut, joists trimmed, upstand built, roof covering made good, plasterboard reveals ready for decoration

Medium fixed unit

£3,345 – £4,795including VAT at 20%

As the small unit, with a larger opening up to about 1 × 2 m and additional trimming

Large or opening unit

£4,795 – £7,795including VAT at 20%

Bigger structural work or an electric opening unit

Guide ranges for supply & fit, including structure and making good; building control or warrant fees extra. Your price is fixed in a written quote after we have seen photos or surveyed. Scaffold, access towers or a crane are priced separately if the job needs them, and building control fees, where a job needs them, are shown as their own line.

Towns we list in County Down

Coverage in County Down works by postcode, not by distance from an office. Give us the full postcode and we will confirm whether it is standard cover, as it is for most of Northern Ireland, or one of the few remote and island areas handled by arrangement. Either way, you get a written quote before any work is booked, with travel included in the price.

Included in the work

  • Plasterboard reveals formed inside and left ready for skim or decoration
  • Survey of joist direction, roof build-up, ceiling void and access
  • Rooflight fitted, sealed and checked for even clearance on every side
  • Cables, pipes and ceiling fittings — We look into the ceiling void for anything in the way of the new opening.
  • Upstand energy performance — We build the upstand to meet the energy limit for site-built upstands, not just to hold the rooflight up.

Rules that apply in Northern Ireland

In Northern Ireland, the energy standard for a new or replacement rooflight or roof window in an existing home is WER Band C or a U-value of 1.6 W/m²K, under Technical Booklet F1. Cutting a new opening alters the roof structure, so a building control application is expected; confirm with the council's building control team. Planning permitted development covers many rooflights on houses if they stay below the ridge, project no more than 15 cm on a road-facing slope and sit at least 0.5 m from the ridge, eaves and verges.

Common questions in County Down

Do you make good inside after fitting?

Yes, where the quote includes it. Internal finishing usually means lining the reveal with plasterboard, taping or skimming, and fitting trim where it meets the ceiling. Some people prefer their own plasterer or decorator to finish off, which is fine. The written quote spells out exactly where our work stops, so nobody is left guessing about who does what once the unit is in.

Can you fit the rooflight I bought online?

Yes, fit-only is one of our core services. Send the product link or spec, photos of the roof and rough sizes, and we can usually price it from those. Before fitting we check the delivery for damage, which should be reported to the seller, plus the size against the builder's opening and the upstand height. The product warranty stays with the maker or seller, and our guarantee covers the fitting.

Do you need scaffolding to fit a rooflight?

Not always. Single-storey roofs can often be reached safely with ladders, a tower or edge protection. Higher roofs, steep pitches and large units usually need scaffold or a mobile platform, and heavy glass may need a crane. We assess access from your photos or at the survey, and any scaffold or lifting cost is shown as its own line on the written quote.

Rear extension at dusk with lit rooflights and a roof lantern
Ready when you are

Fitting in County Down

Send photos and rough sizes, or ask for a survey visit for install work. You get one fixed written price before anything starts.

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