Usually not, for a house. A sun tunnel dome on a house roof is normally permitted development, provided its rise above the slope is 0.15 metres or less and it is not taller than the roof's highest point. Flats, listed buildings, conservation areas and homes under an Article 4 direction work differently, and there the answer can be yes. Building Regulations are a separate question, and they do apply.
The permitted development rule for houses
Under the General Permitted Development Order, Class C of Part 1 covers any other alteration to the roof of a house. A rooflight, and a tubular skylight dome is treated as one, may rise no further than 0.15 metres off the existing slope, and its top edge must sit below the ridge or whatever point of the roof is tallest. That rule is written for houses, so it does not extend to flats or maisonettes, whose owners need to check with the council.
Many sun tunnel domes are low enough to sit within the limit. A taller or bubble-shaped dome can approach it, which is why we check the height of the exact product at survey, not from a catalogue picture.
Where the answer changes
| Situation | What changes |
|---|---|
| Flat or maisonette | No permitted development, so apply to the council |
| Conservation area | Class C still applies unless an Article 4 direction removes it |
| Listed building | Listed building consent is likely needed |
| Article 4 direction | Permitted rights may be removed |
| Peak District National Park | Planning sits with the Park Authority |
A conservation area does not remove the right on its own, but many carry an Article 4 direction that does, often on slopes facing the street. A back slope is far easier than a front one. We check the council's conservation map at survey, since boundaries do shift and an old notice may not tell the whole story.
Two planning authorities in one city
Sheffield's western fringe reaches into the Peak District National Park. Planning decisions there belong to the Park Authority, not Sheffield City Council. If you are near Bradfield, the moorland edge of Dore and Totley, or the villages out west, tell us early so we ask the right authority. Beyond the city, our area takes in north Derbyshire and the edges of the Peak, where the same question comes up.
Why a lawful development certificate can help
If you are confident the dome is permitted but want it in writing, you can apply to the council for a lawful development certificate. It carries a fee and the council has eight weeks to decide, though it gives you proof of lawfulness when you sell. Whether to apply is your choice. We can give you the dimensions and drawings you need to support the application.
Building Regulations are different
Permitted development has nothing to do with Building Regulations. A sun tunnel makes a hole through the roof and the ceiling. Where that is notifiable and no competent person scheme member does the job, it has to be notified, and we deal with that through the council or a registered building control approver. If the tube is wider than the gap between rafters, one must be trimmed. That is structural, falls under Part A and needs approval before work starts. England has no Building Regulations daylight test for houses, so nobody measures how much light arrives.
What it means for resale
Keep every document together. A sun tunnel is small, and sellers tend to forget it, so a buyer who finds an unrecorded opening in the ceiling may ask for retrospective evidence. A folder with the certificate, the product details and the life plan answers the question before it is asked.
When a house is sold, the buyer's solicitor looks for evidence that roof alterations were lawful and signed off. The Building Control certificate is that evidence, and any planning confirmation sits beside it. We keep our copy of the notification, and we give you the paperwork at the end of the job. The 10-year guarantee we give is tied to the workmanship you can see on the roof, the flashing and the dome collar, and the tube joints in the loft.
Dome height and the choice of product
If a roof edge is tight on height, the product choice matters. A low-profile dome sits closer to the roof surface, which helps with the 0.15 metre limit and looks tidier from the street. We show you the dome profile at survey and check it against the pitch of your roof. Our page on tube length and light loss shows how the dome position affects the light you gather, and the bathroom page covers the room side.
For the rigid and flexible choice, see rigid or flexible sun tunnels, and for whether a roof window would suit better, tunnel versus window on a landing.
Questions to settle before ordering
- Is the house a single dwelling, or a flat or maisonette?
- Is it listed, or inside a conservation area?
- Is an Article 4 direction in force on the street?
- Does the property fall inside the Peak District National Park?
- What is the profile height of the chosen dome?
Answers to those five cover nearly every case, and we work through them with you at the survey.
Our part in it
We check your address against the rules at the free survey, and if anything looks uncertain we tell you before quoting. The fixed written quote includes the life plan for the dome and diffuser, which says how each is replaced without lifting the roof. For the full limits on other rooflights, see our guide to rooflights, planning and Building Regulations, or visit the sun tunnels page.