Skylight installation for Dorchester: the essentials
Skylight installation in Dorchester means survey, supply and fit — new openings, extensions and fit-only work. We cover the DT1 district and the rest of Dorset, with a survey before any price is fixed.
Many South West towns mix Georgian and Victorian terraces with modern estates, so the right product differs street by street. Think of skylight installation for builders' projects and retrofits into finished roofs.
We work across Dorset, including Dorchester, and in neighbouring towns such as Weymouth and Bridport. Access, parking and how the glass reaches the roof are all checked at the survey.
Specification options
- Internal plaster reveal
- New openings with joist trimming
- Upstands and flashings
- Electrics coordination
- Supply and fit
- Fit-only for units you have bought
- Making good inside included
Before you order: points to check
- Building Regulations approval (a building warrant in Scotland) may be needed
- Work at height is planned with suitable access
Do you need permission in Dorchester?
In England a rooflight on a house is usually permitted development under Class C if it projects no more than 150 mm beyond the roof slope and sits no higher than the ridge. 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.
Under Approved Document L, a rooflight added to an English home must achieve at least 2.2 W/m²K (horizontal plane), and a roof window 1.4 W/m²K or Window Energy Rating Band B. Replacing a rooflight or roof window can be self-certified by an installer registered with an authorised competent person scheme; otherwise building control approval is needed.
See our building regulations guide for U-values, glazing limits and self-certification.
Skylight installation prices in Dorchester
The ranges below are typical for straightforward jobs; your fixed price follows a survey of your roof.
| Option | Guide price inc VAT | Ex VAT |
|---|---|---|
| New opening in an existing roof, supply and fit | £2,395 – £5,395 | £1,995 – £4,495 |
| Supply and fit into a new extension Typical | £1,435 – £3,595 | £1,195 – £2,995 |
| Fit only, customer-supplied unit | £595 – £1,195 | £495 – £995 |
How the job runs
- Send the details. Postcode, rough size and a photo of the roof and room.
- Measure and check. A surveyor visits Dorchester, 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.
Neighbouring towns
Other services in Dorchester
Questions about skylight installation in Dorchester
Do you fit rooflights bought elsewhere?
Yes. We check the product and the opening first, and our workmanship terms cover the fitting rather than the product.
Do I need a structural engineer?
For new openings that cut joists or rafters, a structural check is sensible and building control may ask for calculations.
Is the survey free?
Yes, for new installations. Repair visits are charged.
How do I book a survey in Dorchester?
Send your postcode and, if you can, a photo of the roof and the room. We offer a survey date when we reply.
Will I need planning permission in Dorchester?
English householder permitted development (Class C) normally covers rooflights that stand no more than 0.15 m proud of the roof plane and stay below the highest part of the roof.
