Why the missing paperwork matters at sale
A new rooflight, or a whole-unit replacement, is normally notifiable building work, and the proof it was done properly is a certificate that a buyer's solicitor will expect to see.
When a skylight goes into a roof, the Building Regulations cover more than the hole. Part L sets the thermal standard for the unit and the reveal, Part K expects safety glazing overhead, Part A covers any rafters or joists that were cut and trimmed, and Part B can restrict rooflights close to a party wall or boundary. Building Regulations for rooflights sets out each part. Compliance is shown in one of two ways: a certificate from an installer who belongs to a government-authorised competent person scheme, or a completion certificate from the council's Building Control service after it has inspected the work.
If neither exists, the rooflight is not automatically unsafe. It may be a perfectly good unit, well fitted. What is missing is evidence. On a sale, the seller answers questions on the property information form about alterations and approvals, and the buyer's solicitor and mortgage lender then decide how much the gap matters to them. Planning permission is a separate question: a rooflight can sit happily within permitted development and still lack Building Regulations sign-off. The planning permission guide covers that side.
Regularisation through the council's Building Control service
Regularisation is the formal route to retrospective approval: you apply, the council inspects what is there, and if it is satisfied it issues a regularisation certificate.
The process is generally available for unauthorised work carried out since 11 November 1985. You apply to the council's Building Control service for the district where the house sits, whether that is Cambridge City, South Cambridgeshire, East Cambridgeshire, Huntingdonshire or further out, and pay the fee that council sets. You supply whatever drawings or product details you can find. The make and model plate on the rooflight frame helps a great deal here, and how do I know what skylight I have shows where to look for it.
An inspector then visits. Because the work is finished, they may ask for parts of it to be opened up so they can see what cannot be seen from the room: lining boards lifted to check the insulation around the frame, a look at how the opening was trimmed in the roof structure, or the marking in the corner of the glass that shows whether the inner pane is toughened or laminated. If everything meets the standards that applied when the rooflight went in, the certificate follows. If something falls short, the council will say what needs to change before it can sign off.
Timescales vary between councils and with how busy they are, so start early if you are planning a sale rather than waiting for a buyer's solicitor to raise it.
Indemnity insurance as the alternative
Indemnity insurance is a one-off policy, usually paid for by the seller, that protects the buyer and lender against the cost if the council later takes action over the missing approval.
Solicitors reach for it because it is quick and it avoids an inspection that could uncover problems. It can smooth a sale that is already under way. It is worth being clear about what it does and does not do, though. The policy covers a financial risk: it does not make the rooflight compliant, it does not check the glass or the insulation, and it does nothing for the person living under the skylight. Buyers and lenders take different views on whether a policy is enough, and some will only proceed with a regularisation certificate.
Whether a policy is suitable in your case, and what its terms say, is a question for your conveyancing solicitor. Nothing on this page is legal advice. Do skylights affect home insurance covers the separate question of what your own buildings insurer may ask about roof glazing.
When the rooflight itself does not measure up
Sometimes the missing certificate points to a real shortfall, and the sensible fix is a compliant replacement installed and notified properly, which brings fresh paperwork with it.
Older unapproved skylights can show their age in ways an inspector would pick up: a clear float glass inner pane where laminated safety glass is now expected overhead, a sealed unit that has misted, no insulation around the frame so a cold ring forms condensation on the lining, or a timber kerb on a flat roof that sits too low. Where a unit like that has to change anyway, replacing it with a current rooflight, notified to the council's Building Control service or signed off through a competent person scheme, often settles the question more cleanly than trying to regularise the old one. The misted and failed rooflight replacement service and the guide to safety glass in rooflights explain what the upgrade involves.
It is also a chance to improve the room rather than just the paperwork. If the old skylight was a clear pane on a south slope that overheats a loft bedroom in July, or it lights the ceiling and leaves the desk in shade, the replacement can move, change size or take solar control glass. Skylight replacement options sets out the choices, from like for like to upsizing.
Can the council still act years later?
The council's power to require changes to non-compliant building work is time-limited, but the limits changed recently and depend on when the work was done.
For older work, the window in which the council could serve a notice to alter or remove non-compliant work was short, generally twelve months from completion. Changes under the Building Safety Act 2022, in force from April 2024, lengthened that window considerably for work done since. Prosecution and enforcement rules are detailed and have their own time limits, so read this as background rather than a reason to ignore the issue. A buyer's solicitor will still ask for the certificate whatever the enforcement position, because the question at sale is about evidence and lender requirements, not only about risk of action.
Buying a house with an unsigned-off skylight
If you are the buyer, the questions are whether the rooflight works for you, whether your lender is content, and which route the seller offers.
Look at the skylight on a viewing. Check for misting between the panes, staining on the lining below, and whether it opens and closes as it should. Notice where the light lands at the time of day you would use the room. Then let your solicitor weigh a regularisation certificate against an indemnity policy. If you already plan to replace or add rooflights after moving, factor that in: new work notified properly gives you a clean record from the start. Does a skylight add value to a house looks at how roof glazing affects the way a home presents.
Vision Skylights installs and replaces skylights and rooflights across Cambridge and about 30 miles around. Every quote comes with a written light plan, we install to current Building Regulations, and we handle the notification to the council's Building Control service where the work is notifiable, so the certificate is in your file when you come to sell. See how we work on the skylight and rooflight installation homepage, book a light survey or message us on WhatsApp.
Questions people also ask
Is it illegal to have a skylight without Building Regulations approval?
Notifiable work that was never notified is a breach of the Building Regulations, and the responsibility can fall on the person who carried out the work and, in some cases, the owner. How that applies to a particular house is a legal question for a solicitor, and regularisation exists precisely so that past work can be brought into order.
Do I need approval to replace a skylight like for like?
Replacing a whole rooflight unit is generally notifiable, even in the same opening. Changing only a sealed glass unit may be treated differently. Can I replace a skylight myself covers the notification duty when you do the work yourself.
What if the previous owner fitted the skylight and there are no records?
Ask the council's Building Control service whether it holds any record for the address, but take your solicitor's advice first, since an enquiry can affect indemnity cover. A search of the competent person scheme registers for the address may also turn up a certificate the owner never passed on.
Does a regularisation certificate cost more than normal approval?
Councils generally set regularisation fees higher than the fee for notifying work in advance, and opening up the work adds cost of its own. Each council publishes its own charges, so check with the one that covers your address.
