Rooflight upstands & kerbs in Machynlleth: what is involved?
Thinking about rooflight upstands & kerbs in Machynlleth? The short answer: insulated kerbs built and waterproofed to suit your rooflight. The longer answer depends on your roof, which is why we survey before we price.
Chapels, barns and farm buildings converted across Wales often need bespoke or conservation-style glass. In Machynlleth, as anywhere, rooflight upstands & kerbs are the usual choice for new flat-roof openings and rooflight replacements.
We work across Powys, including Machynlleth, and in neighbouring towns such as Dolgellau and Aberystwyth. Access, parking and how the glass reaches the roof are all checked at the survey.
Choices for your Machynlleth project
- Proprietary insulated kerbs
- Upstands to suit single-ply, felt, GRP or liquid roofs
- Internal plaster-box linings
- Raised upstands for deep green or ballasted roofs
- Timber upstands with insulation
- Insulated to avoid a cold bridge
- Membrane dressed up and sealed
Before you order: points to check
- Insulation continuity around the upstand affects condensation
- Membrane compatibility with the rooflight's sealants
Planning and building rules for Machynlleth
Welsh householder permitted development (Class C) allows rooflights that project no more than 15 cm and sit no higher than the existing roof — but not in conservation areas, National Parks, AONBs or World Heritage Sites. Listed buildings need listed building consent from the council, and flats have no householder permitted development rights.
In Wales the limiting values are 2.2 W/m²K for a rooflight and 1.4 W/m²K (or WER Band B) for a roof window in an existing house. 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 rooflight upstands & kerbs cost in Machynlleth?
These are typical supply-and-fit ranges. For an address in Machynlleth, 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 raised upstand | £715 – £1,195 | £595 – £995 |
| Standard insulated upstand Typical | £475 – £715 | £395 – £595 |
| Small upstand on new roof | £355 – £475 | £295 – £395 |
What happens next
- Send the details. Postcode, rough size and a photo of the roof and room.
- Measure and check. A surveyor visits Machynlleth, measures and checks structure and access.
- Written price. You receive a fixed price listing the unit, the work and the lead time.
- Installation day. Usually one day into a prepared opening, longer for new openings.
Neighbouring towns
More we do in Machynlleth
Rooflight upstands & kerbs in Machynlleth: questions
Why is my rooflight cold around the edge?
Usually an uninsulated upstand. Insulating the kerb and lining the reveal fixes most cold spots.
What roof coverings do you work with?
Single-ply, EPDM, felt, GRP and liquid-applied systems — or we coordinate with your roofer.
Does every rooflight need an upstand?
Flat and dome rooflights do. Pitched roof windows use flashing kits instead.
Can you work alongside my builder in Machynlleth?
Yes. On new extensions we fit once the opening and upstand are ready and coordinate dates with your builder.
Is the survey in Machynlleth free?
Yes for new installations. Repair visits are charged, and we tell you the price before we book.
