How we approach skylight replacement in Welwyn Garden City
For Welwyn Garden City homes and buildings we offer skylight replacement: replacing tired domes and failed glass with a modern rooflight. We measure first, specify to the opening and confirm any planning or building-control points before quoting.
Across the South East, single-storey kitchen extensions on 1930s semis and post-war detached houses are where most flat rooflights and lanterns go. Typical uses for skylight replacement include older extensions due a modern rooflight.
Jobs in Welwyn Garden City are planned around access: whether the roof can be reached from the garden, whether a hoist or crane is needed, and where we can park. We check this when we measure.
Choices for your Welwyn Garden City project
- Misted glass unit replacement only
- Roof window replacement in pitched roofs
- Dome to flat glass upgrade
- Like-for-like size replacement
- Upstand rebuild and insulation
- Option to add opening and rain sensor
- Cures most chronic leaks
Before you order: points to check
- Old glass and domes are disposed of responsibly
- A replacement is a chance to meet current thermal standards
Planning and building rules for 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.
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. 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.
Our planning guide covers each nation in more detail.
Skylight replacement prices in Welwyn Garden City
The ranges below are typical for straightforward jobs; your fixed price follows a survey of your roof.
| Option | Guide price inc VAT | Ex VAT |
|---|---|---|
| Replacement with upstand rebuild and opening unit | £2,995 – £4,795 | £2,495 – £3,995 |
| Dome to flat glass upgrade Typical | £1,915 – £2,995 | £1,595 – £2,495 |
| Like-for-like glass rooflight | £1,555 – £2,155 | £1,295 – £1,795 |
The process, step by step
- Send the details. Postcode, rough size and a photo of the roof and room.
- Survey. We measure the opening, check the roof build-up and agree the options.
- 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.
Nearby towns
More we do in Welwyn Garden City
Common questions
What do you do with the old unit?
We remove it from site and recycle what can be recycled.
Will it mess up my ceiling?
We protect the room and make good the reveal. Minor decoration may be needed afterwards.
Can you replace only the misted glass?
Sometimes, if the frame is sound and the maker supplies replacement units. Often a complete new rooflight costs little more and performs better.
Is the survey in Welwyn Garden City free?
Yes for new installations. Repair visits are charged, and we tell you the price before we book.
Do you offer skylight replacement in Welwyn Garden City?
Yes. We carry out skylight replacement in Welwyn Garden City and across Hertfordshire. Send your postcode and we will offer a survey date when we reply.
