Skylight installation in Welwyn Garden City: what is involved?
Skylight installation in Welwyn Garden City means survey, supply and fit — new openings, extensions and fit-only work. We cover the AL8 district and the rest of Hertfordshire, with a survey before any price is fixed.
Across the South East, single-storey kitchen extensions on 1930s semis and post-war detached houses are where most flat rooflights and lanterns go. Skylight installation suits builders' projects and retrofits into finished roofs.
From Welwyn Garden City to Hatfield, Hertford and St Albans, the same survey-first process applies: measure, specify, fix the price, then fit.
Specification options
- Electrics coordination
- New openings with joist trimming
- Internal plaster reveal
- Supply and fit
- Upstands and flashings
- Fixed price in writing before work
- New openings in existing roofs
Things we check at survey
- Building Regulations approval (a building warrant in Scotland) may be needed
- Structural changes may need an engineer's check
Consents for skylight installation in Welwyn Garden City
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. 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. 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.
Read the planning permission guide before you commit to a design.
Guide prices for Welwyn Garden City
These are typical supply-and-fit ranges. For an address in Welwyn Garden City, 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 |
|---|---|---|
| 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 |
What happens next
- Tell us what you have. Send the AL8 postcode, a rough size and a couple of photos.
- Measure and check. A surveyor visits Welwyn Garden City, measures and checks structure and access.
- Fixed quote. Product, work and price in writing — nothing is ordered until you agree.
- Fit and make good. We fit, seal, test and finish the reveal, then hand over the paperwork.
Neighbouring towns
More we do in Welwyn Garden City
Common questions
Is the survey free?
Yes, for new installations. Repair visits are charged.
Who handles building control?
We tell you which route applies — building control approval, a building warrant in Scotland, or in England and Wales self-certification by a registered competent person — and supply the product data.
How long does installation take?
Fitting into a prepared upstand takes about a day. A new opening in an existing roof, including making good, often takes two to three days.
Do I need to be at home for the survey in Welwyn Garden City?
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 Welwyn Garden City?
Send your postcode and, if you can, a photo of the roof and the room. We offer a survey date when we reply.
