How we approach rooflight upstands & kerbs in Dolgellau
Thinking about rooflight upstands & kerbs in Dolgellau? 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.
Welsh planning rules exclude rooflights from permitted development in conservation areas and National Parks, so we check the designation before quoting. In Dolgellau, as anywhere, rooflight upstands & kerbs are the usual choice for roofs where the old kerb is low, cold or leaking.
We work across Gwynedd, including Dolgellau, and in neighbouring towns such as Machynlleth and Porthmadog. Access, parking and how the glass reaches the roof are all checked at the survey.
Choices for your Dolgellau project
- Timber upstands with insulation
- Internal plaster-box linings
- Proprietary insulated kerbs
- Upstand repairs and rebuilds
- Raised upstands for deep green or ballasted roofs
- Correct height above the finished roof
- Matched to your roof covering
Things we check at survey
- Membrane compatibility with the rooflight's sealants
- Upstand size must match the unit within a tight tolerance
Planning and building rules for Dolgellau
In Wales a rooflight on a house is usually permitted development if it stands no more than 15 cm proud of the roof, except on protected land such as conservation areas and National Parks, where permission is needed. 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. Wales also has its own overheating rules (Part O) for new homes, in force since November 2022.
See our building regulations guide for U-values, glazing limits and self-certification.
Guide prices for Dolgellau
These are typical supply-and-fit ranges. For an address in Dolgellau, 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 |
From enquiry to finished job
- Tell us what you have. Send the LL40 postcode, a rough size and a couple of photos.
- Measure and check. A surveyor visits Dolgellau, measures and checks structure and access.
- Written price. You receive a fixed price listing the unit, the work and the lead time.
- Fitting and handover. We install, clean down and leave product and warranty documents.
Rooflight upstands & kerbs near Dolgellau
More we do in Dolgellau
Questions about rooflight upstands & kerbs in Dolgellau
How high should a rooflight upstand be?
High enough to meet the rooflight manufacturer's minimum above the finished roof surface — commonly 150 mm. On roofs with deep finishes, such as green roofs, it needs to be taller.
Does every rooflight need an upstand?
Flat and dome rooflights do. Pitched roof windows use flashing kits instead.
What roof coverings do you work with?
Single-ply, EPDM, felt, GRP and liquid-applied systems — or we coordinate with your roofer.
Do you offer rooflight upstands & kerbs in Dolgellau?
Yes. We carry out rooflight upstands & kerbs in Dolgellau and across Gwynedd. Send your postcode and we will offer a survey date when we reply.
Can you work alongside my builder in Dolgellau?
Yes. On new extensions we fit once the opening and upstand are ready and coordinate dates with your builder.
