How we approach sliding rooflights in St Austell
We handle sliding rooflights across Cornwall, including St Austell. In short: box rooflights whose glass lid slides back for walk-out roof access. The survey checks structure, weathering and orientation, so the quote reflects your actual roof.
Western coasts take wind-driven rain, so we pay close attention to upstand height and flashing laps on exposed roofs. Think of sliding rooflights for staircases that rise to a roof terrace.
St Austell is around 22 km from Truro, and we survey and fit throughout that part of Cornwall, including the PL25 district.
What you can choose
- Anthracite, black or RAL frames
- Rain sensor
- Electric drive with safety edge
- Integrated balustrade on some ranges
- Double or triple glazing
- Replaces a dormer or stair enclosure on some roofs
- Glazed box sides keep the headroom open
Before you order: points to check
- Needs space on the roof for the lid to slide clear
- Weight and point loads need a structural check
Planning, building control and St Austell
Most rooflights on English houses do not need planning permission, provided they keep within 150 mm of the roof surface and below the ridge line. A rooflight on a side-facing slope must be obscure-glazed, and fixed shut unless the opening part is more than 1.7 m above the floor.
Building Regulations Approved Document L sets a limiting U-value of 2.2 W/m²K for new or replacement rooflights in existing homes, measured in the horizontal plane; roof windows need 1.4 W/m²K or a Band B energy rating. In an extension, glazing including rooflights is normally limited to 25% of the new floor area plus any windows or doors the extension covers, unless a whole-house calculation shows otherwise.
Our planning guide covers each nation in more detail.
Guide prices for St Austell
These are typical supply-and-fit ranges. For an address in St Austell, 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 box slider with electric drive | £11,995 – £20,395 | £9,995 – £16,995 |
| Standard box slider Typical | £8,995 – £13,195 | £7,495 – £10,995 |
| Flat sliding lid | £7,195 – £9,595 | £5,995 – £7,995 |
The process, step by step
- Send the details. Postcode, rough size and a photo of the roof and room.
- Free site visit. For new installs we survey free, measure and confirm the roof detail.
- Fixed quote. Product, work and price in writing — nothing is ordered until you agree.
- Installation day. Usually one day into a prepared opening, longer for new openings.
Neighbouring towns
Other services in St Austell
Questions about sliding rooflights in St Austell
Is it lockable?
Yes. Units lock from inside and the drive holds the lid closed.
How heavy is it?
Box sliders weigh hundreds of kilograms, so delivery may need a crane or lifting gear, and the structure must be checked.
What if it is raining?
Fitted with a rain sensor, an electric unit closes automatically. Most also have a manual override for power cuts.
Is the survey in St Austell free?
Yes for new installations. Repair visits are charged, and we tell you the price before we book.
Do you fit sliding rooflights in St Austell?
Yes. We survey and fit sliding rooflights in St Austell and across Cornwall. Send your postcode and we will offer a survey date when we reply.
