Skylight replacement in Sidcup: what is involved?
Thinking about skylight replacement in Sidcup? The short answer: replacing tired domes and failed glass with a modern rooflight. The longer answer depends on your roof, which is why we survey before we price.
Mansard and loft conversions are common across London, and roof windows are often set out alongside dormers on the rear slope. Typical uses for skylight replacement include yellowed domes, misted glass and leaking roof windows.
From Sidcup to Bexley, Welling and Eltham, the same survey-first process applies: measure, specify, fix the price, then fit.
What you can choose
- Dome to flat glass upgrade
- Misted glass unit replacement only
- Roof window replacement in pitched roofs
- Fixed to electric opening
- Upstand rebuild and insulation
- Better thermal performance
- Option to add opening and rain sensor
Before you order: points to check
- A replacement is a chance to meet current thermal standards
- Old glass and domes are disposed of responsibly
Consents for skylight replacement in Sidcup
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.
For English homes the energy rules ask for rooflights of 2.2 W/m²K or better and roof windows of 1.4 W/m²K (or WER Band B); most modern double glazed units meet both. The Future Homes and Buildings Standards, published in March 2026, apply from 24 March 2027 and keep the 2.2 W/m²K limit for rooflights.
Read the planning permission guide before you commit to a design.
Skylight replacement prices in Sidcup
These are typical supply-and-fit ranges. For an address in Sidcup, 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 |
|---|---|---|
| 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 |
What happens next
- Tell us what you have. Send the DA14 postcode, a rough size and a couple of photos.
- Survey. We measure the opening, check the roof build-up and agree the options.
- 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
Related work in Sidcup
Questions about skylight replacement in Sidcup
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.
Will it mess up my ceiling?
We protect the room and make good the reveal. Minor decoration may be needed afterwards.
How long does a replacement take?
Usually a day for a standard rooflight on a sound upstand.
Do you offer skylight replacement in Sidcup?
Yes. We carry out skylight replacement in Sidcup and across Greater London. Send your postcode and we will offer a survey date when we reply.
Is the survey in Sidcup free?
Yes for new installations. Repair visits are charged, and we tell you the price before we book.
