Flat rooflights for Merthyr Tydfil: the essentials
We handle flat rooflights across Mid Glamorgan, including Merthyr Tydfil. In short: fixed double or triple glazed rooflights for flat roofs and extensions. The survey checks structure, weathering and orientation, so the quote reflects your actual roof.
Many Welsh homes have older single-storey rear extensions where a glass rooflight brightens a dark kitchen. In Merthyr Tydfil, as anywhere, flat rooflights are the usual choice for landings, bathrooms and rear extensions with flat roofs.
Merthyr Tydfil sits about 6 km from Aberdare and 11 km from Rhondda, and we cover the whole CF47 postcode district and the roads in between.
Options we can specify in Merthyr Tydfil
- Square, rectangular or long-format sizes
- Frame colours: anthracite, black, white or RAL
- Solar-control or self-cleaning outer pane
- Insulated kerb or timber upstand built to suit
- Double or triple glazing
- Double or triple glazed with a warm-edge spacer
- Even, top-down daylight across the whole room
Before you order: points to check
- Rooflights count toward glazing in an extension, which matters for Building Regulations energy and overheating rules
- The roof membrane must be dressed up the upstand before the unit goes on
Do you need permission in Merthyr Tydfil?
Planning rules in Wales are tighter than in England for rooflights: Class C rights do not apply in conservation areas, National Parks or AONBs, so a rooflight there needs planning permission. A side-facing rooflight within 10.5 m of the boundary must be obscure-glazed, and non-opening unless the opening part is more than 1.7 m above the floor.
Approved Document L in Wales (2022 edition) sets 2.2 W/m²K for rooflights, measured horizontally, and 1.4 W/m²K or Band B for roof windows in existing homes. A revised Welsh Approved Document L takes effect on 4 March 2027; rooflights in new dwellings stay at 2.2 W/m²K.
See our building regulations guide for U-values, glazing limits and self-certification.
What do flat rooflights cost in Merthyr Tydfil?
These are typical supply-and-fit ranges. For an address in Merthyr Tydfil, scaffold, a hoist for heavy glass, or a new structural opening can move the figure, which is why we survey first.
| 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 |
How the job runs
- Get in touch. Use the form, WhatsApp or the guide-price tool with your Merthyr Tydfil address.
- Measure and check. A surveyor visits Merthyr Tydfil, measures and checks structure and access.
- Agree the quote. You approve the specification and price before anything is ordered.
- Fitting and handover. We install, clean down and leave product and warranty documents.
Nearby towns
More we do in Merthyr Tydfil
Common questions
How long does it take?
Fitting into a prepared upstand usually takes a day. Forming a new opening in an existing roof, including making good inside, is often two to three days.
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.
Can you fit into my existing flat roof?
Yes. We form a new opening, trim the joists, build and waterproof an upstand and make good the ceiling. A survey confirms the joist direction and roof build-up first.
How do I book a survey in Merthyr Tydfil?
Send your postcode and, if you can, a photo of the roof and the room. We offer a survey date when we reply.
Can you work alongside my builder in Merthyr Tydfil?
Yes. On new extensions we fit once the opening and upstand are ready and coordinate dates with your builder.
