Skylights & rooflights in Seaford

Not every skylight question in a coastal town like Seaford is about a new idea. Some are about units that were fitted years ago and have now started to let the house down. The glass has clouded between the panes, a frame has gone soft at the corner, or the opening light no longer closes square. Each of those is a sign that the unit has reached the end of its working life.

A misted double-glazed unit is the easiest of these to spot. The sealed gap between the panes has failed, moisture has got in, and no cleaning will clear it. A sealed unit cannot be opened up and put right, so the honest answer is assessment and then replacement. A failed glass unit and a failed frame lead to different jobs, and the misted and failed rooflights page shows how we separate them.

Replace the glass or replace the whole unit

On the survey we look at the frame before we say anything about the glass. The choice usually comes down to two routes.

Where we replace a whole unit we handle the Building Control notification, which for Seaford goes to Lewes District Council or a registered building control approver. Read the wider rules in our Building Regulations guide for skylights and rooflights.

Seaford lies on the coast between the mouths of the River Ouse and the Cuckmere, with chalk downland rising behind it and the Seven Sisters cliffs to the east. Its fortunes picked up in the nineteenth century, when the railway tied the town to Lewes and London. That history gives us a useful clue to what is on the roofs: a town that grew in stages carries roofs of different ages, and each age has its own way of going wrong.

We will not pretend to know the roof of every street. What we do know is how to read one when we are standing on it. On an older pitched roof, a window in the slope means lifting the slates or tiles around it and choosing flashings that suit that covering. A later extension with a flat roof and a single rooflight needs its upstand and kerb looked at. A conservatory or garden room with a glazed roof is a different job again, usually a lantern or a rooflight panel.

What we check from the roof

On the survey visit we look at three things before we measure anything. First, the roof covering around the opening, because the new unit has to weather properly into it. Second, the structure under the opening: trimmers and rafters or joists, and whether they have been cut or notched in the past. Third, the room below, since the lining and the way the light falls matter as much as the unit itself.

Those three checks decide whether the new unit goes into the old opening or whether the opening has to change. Altering the size of the old opening brings the same structural questions as cutting a fresh one.

A railway-era town also tends to have houses that have been altered more than once: a loft converted by one owner, a rear extension added by the next. Each alteration leaves its own joins in the roof, and a rooflight often has to be fitted across them. We would rather find that on the survey than discover it with the old unit lifted out. Where earlier work has weakened a rafter or left a poor upstand, we say so in the written quote and price the correction in, instead of adding it later.

If the roof has a flat section, our page on flat roof rooflights shows how those are built up from the kerb. If you are looking at a glazed extension, roof lanterns covers that.

In Seaford the district council deals with planning applications and runs its own Building Control team. Two conservation areas cover parts of the town: Seaford (Town Centre) and Seaford (East Blatchington). If your house is inside either, say so when you ask the council.

Living in a conservation area does not by itself take away the rooflight rights a house normally has. We cannot tell you from here whether a direction covers your address in Seaford, because that is a question for the council, and the answer depends on the street. A listed building is a separate matter and needs listed building consent on top. Our planning guide for rooflights sets out the rules in full, and it is the right place to check what applies.

Seaford sits within about two kilometres of the South Downs National Park boundary. Some outskirts may lie inside it. Inside the park the South Downs National Park Authority is the planning authority, while Lewes District Council still handles Building Control. So the postcode matters. If your home is near the edge of town, check which authority applies before any application goes in.

Where a conservation area applies and you want a rooflight on a visible slope, our conservation rooflights are slim, low-profile units made for that situation. They sit close to the roof plane and are the kind of thing a planning officer is more comfortable with. Flats are different again: permitted development does not extend to them, which means any rooflight on a flat goes through a planning application. Our page on flat planning rules has the detail.

Access is where a rooflight job is won or lost, which is why each quote comes with an access plan on a single page. Read it and you know the way up, who applies for licences, what the freeholder or neighbours should be told, how Building Control is handled and what it costs.

For a house with a back garden, the route is often a rear scaffold set up through the garden. Where a terrace or semi has no passage at the side, the answer may be a street tower or a mobile platform. Which one suits depends on what you can see when we visit: how wide the passage is, how far the roof is from the ground, and what is in the way.

Scaffold or a platform on the Seaford pavement or road needs a licence, and East Sussex County Council issues it as highway authority. If a parking bay has to be suspended, that comes from the same authority. We apply for both, and we do not quote a fee or a lead time in advance, because the authority sets them. The licences and bay suspensions guide sets out how that goes.

Roofs in converted houses and blocks generally belong to the freeholder. Before any work starts you will normally need their written consent, often called a licence for alterations, if you hold a lease. Check your lease, then tell us what it says. The access plan records it so nobody is surprised on the day.

We also tell neighbours before the scaffold goes up. It is a small step that avoids a lot of awkward conversations over a fence.

Weather matters on a coastal roof too. A rooflight is lifted out and a new one lowered in, and the opening is never left uncovered overnight without a temporary weathering. On the survey we ask which rooms sit under the opening, so we know what needs sheeting in the house before work begins. Furniture and floors below a rooflight are moved or covered, and the route through the house to the garden or street is agreed with you in advance.

Seaford has roads of different widths, from broad streets to narrow ones, and the deliveries differ with them. A new roof lantern arrives as a built frame or in sections, and getting it from the van to the roof is part of the plan. That is why we want to see the street, the passage and the roof before we name a day.

Once the planning position and the access are clear, the product choice is a matter of the roof and the room. The table sets out the usual match.

The values in the last column are the figures a new or replacement unit must meet under Part L for existing dwellings. A roof window in a sloping roof must reach Window Energy Rating band B or 1.4 W/m²K, while a flat-roof rooflight or lantern is held to 2.2 W/m²K. You do not need to remember them: we specify units that meet the right one for your roof, and the survey says which applies.

If heat loss is your main worry, read about energy efficient rooflights. If the unit sits over a spot someone will walk on, such as a terrace over a utility room, walk-on rooflights are the answer. For a dark hallway or landing where there is no room for a window, a sun tunnel brings in light with a small opening.

Escape windows are a separate rule. Only a storey whose floor sits no more than about 4.5 m above the ground can use a window to escape, so a roof window can serve as an escape in a bungalow or chalet bungalow, but a loft conversion on a taller house needs a protected stair instead.