Water ingress at the flashing
Lantern-to-roof junction is the fault line. Bad flashing means water tracks along ceiling joists you can't see.
Roof Lanterns
Aluminium roof lanterns —flood your flat-roofextension with daylight.
Slim-frame aluminium lantern systems, thermally broken and solar-controlled — a rear extension's most transformative single upgrade, fitted watertight, first time.
MTC-certified installers · ASSURE registered · 10-year frame guarantee + IBG
- VEKA Approved Installer
- ASSURE Registered
- MTC-Certified Fitters
- 10-Year Guarantee + IBG
- £1M Public Liability
Service overview
The service, plainly
A roof lantern is a glazed pyramid or ridged structure fitted over a flat-roof aperture — usually on a rear extension — that transforms the amount of natural light entering the room below. We survey the aperture and structural opening, specify the correct lantern system for the size, supply and install the lantern, and finish flashings and internal reveals.
The right client is anyone with a flat-roof rear extension (existing or under construction) who wants to properly light a kitchen, dining room or living space. It's especially impactful on north-facing rooms and central-plan extensions that struggle for daylight.
You need a proper installer because a lantern is a hole in the roof. Flashing, weathering and glazing integration decide whether it looks stunning or leaks. Our team fits lanterns as a specialism, not as a sideline.
The cost of leaving it
Where roof lanterns go wrong
A lantern that leaks or ages badly is the single most damaging fault in a rear extension.
Condensation on the internal frame
Cheap non-thermally-broken lanterns stream condensation onto the internal reveals every winter — plasterboard rots, decor is ruined.
Solar gain in summer
Wrong glazing spec turns a beautiful room into a greenhouse. Solar-control coatings are cheap; retrofitting them is expensive.
Frames that discolour or fade
Poorly powder-coated systems fade in five years. A premium finish holds its colour for decades.
Our process
Five steps from enquiry to guaranteed install.
- STEP 01
Free survey
We visit, measure the aperture, discuss aspect (for glazing spec), colour, ridge configuration and how the lantern integrates with the existing roof.
- STEP 02
Written quote in 1–2 days
Itemised — lantern, glazing, flashings and install. Valid 30 days.
- STEP 03
Order & manufacture
50% deposit. Manufactured to survey dimensions in your specified RAL colour. 4–6 week lead time.
- STEP 04
Installation
Aperture prepared, upstand checked, lantern fitted, flashings dressed and weathered, glazing installed, internal reveals finished ready for decoration.
- STEP 05
Handover
ASSURE-notified, 10-year frame guarantee, 5-year glass, IBG cover, balance settled on the day.
Benefits
Concrete outcomes — not vague promises.
Transformative daylight
A properly specified lantern can double the daylight in a rear extension — genuinely life-changing on a north-facing room.
Architectural feature
Slim aluminium frames read as a designed detail, not an add-on.
Watertight, first time
Correct flashing and weathering means the first heavy Welsh downpour is a non-event.
Thermally efficient
Modern thermally broken lanterns don't behave like older aluminium — no condensation streams, no cold spot.
Solar-controlled glazing
The right coating keeps summer heat gain in check while letting daylight through.
10-year cover, IBG-backed
Frame and finish guarantee, 5-year glass, independently underwritten.
In detail
Systems, glazing and structural detail
Lantern specification is quiet engineering — most decisions are invisible in the finished job.
Systems
We install Smart, Aluk and Jack Aluminium lantern systems — thermally broken, low-sightline profiles engineered specifically for glazed roofs.
Configuration
Rectangular, square, and long ridged configurations. Ridge orientation and pitch chosen to suit the extension shape and the room below.
Glazing
Argon-filled Low-E as standard, with solar-control coatings, self-cleaning glass, and blue or grey tints available. Toughened as standard in overhead glazing.
Finishes
Any RAL colour, powder-coated inside and out — matched to any adjacent bi-folds, sliders or aluminium windows.
Upstand and structural detail
Correct upstand height, insulation and DPC detailing decides how the lantern integrates with the flat roof. We survey and specify these correctly.
Residential vs commercial
Predominantly residential extensions, but we've fitted lanterns on small commercial premises — atria, break-out rooms and reception spaces.
Frequently asked
Everything homeowners ask before booking.
Do I need a roof lantern or a flat rooflight?
Lanterns are architectural — pyramid or ridged, more visual impact. Flat rooflights are lower profile and lighter. We'll walk through both at survey.
How big can a lantern go?
Modern aluminium systems handle 3m+ in one span. Larger apertures use ridge configurations with intermediate rafters.
Will it leak?
Not when the flashing and weathering are done properly. That's exactly what we're paid for.
How thermally efficient are lanterns now?
Modern thermally broken lanterns with argon-filled Low-E glazing meet Building Regs comfortably.
Will it be too hot in summer?
Not with the right glazing spec. Solar-control coatings are inexpensive at spec stage and highly effective.
How much does a roof lantern cost?
No honest 'from' figure — depends on size, glazing spec, colour and structural prep. Fixed itemised quote after a free survey.
How long does installation take?
1–3 days on site for most residential lanterns, depending on the flat roof condition and access.
Do you install lanterns on new extensions or only existing?
Both — we regularly work directly with builders on new extension projects and fit lanterns as part of the roof coordination.
What guarantee do I get?
10 years on the frame and finish, 5 years on the glass, IBG-backed.
Do you install lanterns in Newport?
Yes — Newport, Blackwood, Caerphilly, Cwmbran, Ebbw Vale, Pontypool, Tredegar and across the wider Gwent area.
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Next step
Transform a flat-roof extension with a properly specified lantern.
Free on-site survey, written quote in 1–2 days, watertight install by our own team.
ASSURE registered · MTC-certified fitters · 10-year guarantee + IBG