How we approach dome rooflights in Penzance
Thinking about dome rooflights in Penzance? The short answer: polycarbonate and acrylic domes for flat roofs, new or replacement. The longer answer depends on your roof, which is why we survey before we price.
Barn and chapel conversions in the South West often need bespoke or shaped rooflights to suit the original structure. Dome rooflights suit older flat roofs with yellowed or leaking domes.
We work across Cornwall, including Penzance, and in neighbouring towns such as Camborne and Redruth. Access, parking and how the glass reaches the roof are all checked at the survey.
Options we can specify in Penzance
- Fixed or hinged with vent
- Twin, triple or quad skin
- Fall-through protection mesh
- Insulated PVC or GRP upstands
- Clear, opal or tinted
- Smoke-vent versions available
- Light, impact-resistant domes
What to check first
- Upstand condition decides whether you replace dome only or the whole unit
- Plastic domes have a lower acoustic and thermal performance than glass
Building control and safety duties in Penzance
For non-domestic buildings, planning depends on the building and its location; building regulations cover thermal performance and the fire classification of rooflights near boundaries. Product data for building control is supplied with every quote.
For buildings other than dwellings, Approved Document L Volume 2 sets limiting U-values of 2.2 W/m²K for rooflights and 3.0 W/m²K for roof ventilators, including smoke vents. Fire classification of rooflight materials near boundaries is checked at specification.
Our planning guide covers each nation in more detail.
What do dome rooflights cost in Penzance?
The ranges below are typical for straightforward jobs; your fixed price follows a survey of your roof.
| Option | Guide price inc VAT | Ex VAT |
|---|---|---|
| Dome and new insulated upstand | £955 – £1,675 | £795 – £1,395 |
| Hinged or vented dome Typical | £715 – £1,195 | £595 – £995 |
| Replacement fixed dome | £475 – £835 | £395 – £695 |
How the job runs
- Send the details. Postcode, rough size and a photo of the roof and room.
- Measure and check. A surveyor visits Penzance, measures and checks structure and access.
- Written price. You receive a fixed price listing the unit, the work and the lead time.
- Fit and make good. We fit, seal, test and finish the reveal, then hand over the paperwork.
Neighbouring towns
More we do in Penzance
Dome rooflights in Penzance: questions
Why has my dome gone yellow?
UV breaks down older plastics over time. Modern domes have UV-protective layers, but all plastics age.
Are domes safe to walk on?
No. Treat any rooflight as fragile unless it is specifically certified non-fragile, and never stand on it.
Should I replace a dome or switch to glass?
A dome is cheaper and quick; glass gives a clear view and better performance. On a tight budget, or a commercial roof with many units, domes remain sensible.
Do I need to be at home for the survey in Penzance?
Yes — someone needs to let us into the room below and, where possible, show us how the roof is reached.
How do I book a survey in Penzance?
Send your postcode and, if you can, a photo of the roof and the room. We offer a survey date when we reply.
