Gwynedd & Anglesey · Wales

Roof Lanterns in Gwynedd & Anglesey

Is the middle of your extension in Gwynedd & Anglesey too dark? A roof lantern or skylight brings in light that wall windows cannot reach.

Guide from £1,095
5 towns covered
Postcode areas LL

About roof lantern replacement in Gwynedd & Anglesey

A roof lantern is assembled from an aluminium ridge, hip bars and glazing bars that hold sealed glass units on each pitch. It sits on an upstand built around the roof opening. The upstand should be level, weathered into the roof covering and insulated, because a poor upstand causes most leaks and cold spots.

Cutting a new opening for a roof lantern or skylight usually means trimming joists or rafters, so the roof can carry the load around the hole. Building regulations approval is generally needed for a new rooflight, covering structure, energy performance and, near a boundary, fire performance.

Warm, moist air rises and collects in a roof lantern, so condensation can form on cold winter mornings, especially over kitchens and bathrooms. Thermally broken frames, warm-edge spacers and good room ventilation reduce it, and opening vents in the lantern can release warm air in summer.

Glass for lanterns usually comes with a self-cleaning outer coating that helps rain wash away dirt, and a choice of clear, neutral or blue-tinted solar-control glass. Solar-control glass limits heat build-up under a south-facing lantern, while clear low-E glass suits shaded or north-facing rooms.

Roof lantern above a kitchen island in an open-plan extension

Towns we cover for roof lanterns in Gwynedd & Anglesey

Choose your town for local details, nearby areas and the postcode districts we cover.

What applies in Gwynedd & Anglesey

In Wales, Approved Document N covers safety glazing: safety glass is needed in and around doors and in low-level glazing where people could walk into it.

Wales sets its own energy standards in the Welsh Approved Document L. Replacement windows, doors and rooflights must meet the limiting values set there, which your quote will reference.

Gwynedd & Anglesey has its own coastline, so for homes and businesses near the sea, salt air and wind-driven rain are part of the brief. Coastal lanterns face salt deposits on the glass and frames and strong uplift from wind on exposed roofs. Marine-grade coatings, stainless fixings and secure fixing to a well-built upstand matter, and salt film may need rinsing more often than self-cleaning glass manages alone.

Rural roofs collect more leaves, moss and bird debris, so lanterns need clear upstand drainage and regular checks. Exposed sites see higher wind loads and driving rain, and older outbuildings may need the roof structure strengthening before a lantern is added.

Guide prices

Guide prices inc VAT for typical jobs. Remote and island locations are quoted by arrangement. Your written quote fixes the price after measuring.
Typical job	Guide price inc VAT
Lantern 1500 × 1000 mm, fitted to a kerb	£1,395 – £1,795
Lantern 2000 × 1000 mm	£1,695 – £2,095
Lantern 3000 × 1500 mm	£2,795 – £3,695
Flat glass rooflight 1000 × 1000 mm	£1,095 – £1,395

Choosing your roof lanterns

Solar-control glass

Neutral or blue-tinted coatings that reduce heat build-up under south or west-facing lanterns while keeping daylight levels high.

Opening vents

Manual or electric vents in the lantern or skylight, with optional rain sensors that close them automatically in wet weather.

Frame colours

Powder-coated aluminium in grey, black, white or other RAL colours, often dual colour to suit the roof and the room.

Square or octagonal lantern

A pyramid or eight-sided design that suits square rooms, orangeries and spaces where a central focal point is wanted.

Roof Lanterns in Gwynedd & Anglesey: questions

Will a roof lantern make my room too hot?

A roof lantern can add heat on sunny days, especially facing south or west, because overhead glass receives sun for much of the day. Solar-control glass, opening vents and blinds help keep the room comfortable. The glass is chosen at survey based on the lantern's size and orientation and how the room is used.

What guarantee comes with a roof lantern?

Manufacturer guarantees apply to the frame, coating and sealed units, and the terms are confirmed in writing. The upstand and roof covering may be covered separately, depending on who builds them. Guarantee terms for the installation are set out in writing with your quote, so you know exactly what is covered before going ahead.

Why does my roof lantern get condensation?

Condensation forms when warm, moist air from cooking, bathing or drying clothes meets the colder glass and frames at high level. Older single glazed or non thermally broken lanterns suffer most. Thermally broken frames, warm-edge spacers, extractor fans and opening vents reduce it. Some condensation on very cold mornings is normal and clears as the room warms.

How do I clean a roof lantern?

Self-cleaning coated glass lets rain lift most dirt, but a rinse with clean water in long dry spells helps. Clean from a safe position at the roof edge or from a suitable platform, never by standing on the lantern. Wipe the inside glass with mild soapy water, and keep leaves clear of the upstand and roof outlets.

Which parts of Gwynedd & Anglesey do you cover for roof lanterns?

We cover the whole of Gwynedd & Anglesey, including Bangor (Gwynedd), Holyhead, Caernarfon, Pwllheli and Dolgellau, and postcode areas LL. Building rules for roof lanterns here follow the regulations for Wales. Enter your postcode on the quote form and we will confirm cover; then a glazier will arrange a free survey before giving you a written quote.

Other glazing services in Gwynedd & Anglesey

All glazing in Gwynedd & Anglesey · Roof Lanterns & Skylights across the UK

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