Skylight Installation in Langdon Hills
Skylight and rooflight installation in Langdon Hills: elevated wooded plots with wide southerly views, and what that means for specifying a rooflight here.
Langdon Hills sits on the high ground at the western side of the Basildon district, and everything about a roof job here follows from the way the land lies. The ground rises, then falls away southwards, so the back of a house on this hillside looks out over a long open view with very little standing in front of it. That is why people buy here. It is also the awkward part of putting glass into these roofs, because the view and the sun arrive from the same direction. A rear slope pointed at that horizon has a clear run at the sky from mid-morning until sunset, and in winter the low sun comes straight down the hill and in through the pane. Plenty of daylight is available on this hillside. The work is in taking it without taking the heat with it.
The houses on the hill and the roofs they came with
Langdon Hills was never laid out in one go, and the roofs show it. Houses here went up plot by plot over a long stretch of years, so a single road can carry four building eras and four ways of framing a roof. That matters more than it sounds, because it means the answer for your neighbour’s house is not automatically the answer for yours.
The oldest layer on most streets is pre-war and interwar: detached houses and bungalows on generous plots, put up individually rather than in runs. Roofs from that period are cut on site, rafters carried on purlins with struts dropping onto internal walls, and there is usually a decent void under the ridge. Coverings vary a lot, plain clay tile, deep-profile pantile, occasionally natural slate, and where a roof has been stripped and recovered since, it has most likely come back in concrete interlocking tile. The profile of what is actually on your roof decides which flashing kit belongs on the job. A deep pantile and a flat concrete tile need different flashing geometry, and a kit bent to fit the wrong profile is how water finds its way past a rooflight several winters later.
The larger layer is later. Substantial detached housing from the 1960s through to the 1990s makes up much of the stock, built with double garages, wide frontages and roofs of real volume. Gables, hips, sometimes a room in the roof designed in from the start. Structure is a mixture: cut roofs on the earlier houses, factory-made trusses on the later ones, and the difference decides how wide an opening can be before somebody has to work out a new load path.
Then there are the one-off replacement houses. Big plots on a hillside attract rebuilds, and a modern house on an old plot brings a large modern roof with attic trusses, a steeper pitch and often a great deal of surface facing the view.
The last roof on the list is the one nobody thinks of as a roof. Rear extensions, garden rooms, utility returns and orangeries on these plots are usually flat or close to it. So are the conservatories that have been reroofed in solid panels over the years, which is a change that warms a room up and darkens it at the same time. Putting glass back into that new solid roof is one of the more satisfying jobs on this kind of house, because the room already exists and only the daylight is missing.
What the slope does to a roof job
Build on a hillside and the house stops behaving like a house on flat ground.
The first thing that changes is apparent height. Where the garden falls away behind the property, a house that reads as two storeys from the road can be a good deal taller at the back, and the rear eaves sit higher above the ground than anyone expects standing in the front drive. Where the land rises behind instead, the opposite happens and the rear roof comes down within easy reach of the garden. Both are common on this hillside, sometimes within a few doors of each other, and the difference sets the whole access plan.
The second is that roofs here get looked at. On level ground a rear roof slope is private by default, seen by nobody but the birds. On a slope, the houses further up the hill look down onto the roofs below them, and open ground gives long views across whole roofscapes at once. A rooflight that stands proud of the tiles reads from a distance in a way it never would on the flat. That is one of several good reasons to fit units that sit down in the plane of the covering rather than perched on top of it, and it is also worth thinking about where a neighbour’s upstairs window sits in relation to a new opening in your roof.
The third is drainage and the run of the roof itself. Split-level plans, garages tucked into the bank, and rear additions stepped down to follow the ground all produce junctions where two roofs of different heights meet. Those junctions are where the existing weathering is already working hardest, and a new opening wants to be sited clear of them rather than close in.
The view and the sun arrive together
Southend faces south across the Thames Estuary, and although Langdon Hills sits inland, around 15 miles by road from the city, it shares the same southerly aspect from a good deal higher up. That combination is unusual and it does specific things to a roof.
Start with what is not there. On a typical suburban plot, a south-facing slope loses an hour here and there to a neighbour’s gable, a garage, a street tree, a block of flats down the road. On this hillside the ground drops away in the same direction the roof is facing, so those obstructions sit below the line of sight and take nothing out. The result is a rear pitch that collects sun through the whole middle of the day and keeps collecting it late, from roughly March to September, at close to the full amount the latitude allows.
Then add winter. A low sun in December is the one that gets past everything, and on open high ground there is nothing for it to get past. That is genuinely useful, because free solar heat in January is a gain rather than a problem, and it is one of the arguments for not over-specifying the glass on a pitch you mainly use in the cooler months. It is also the reason a room on this slope can go from pleasant in April to unusable in July without anything about it having changed except the height of the sun.
Mature planting on plot boundaries does provide some shade, and on a wide plot with old trees along the southern edge it can be significant in high summer. It is not something to specify around. Leaf cover disappears for half the year, sunlight comes through gaps at full strength rather than as an even dimming, and the tree belongs to whoever owns that side of the fence. Design the glass for the day the shade is not there.
Orientation is still worth establishing property by property rather than assuming. Roads on a hillside follow contours, so the houses along one road often share an aspect, and the pitch facing the view is the sunny one for the whole run. Ten minutes with a compass at survey answers it for good.
Exposure on high ground
Wind speeds up as it climbs over a rise, so a roof on the top of a hill takes weather that a roof at the bottom of the same hill never sees. Langdon Hills is high ground with open country to the south of it, and the south-westerlies come across that open ground with nothing much to slow them down before they reach the ridge.
Three practical consequences follow, and all three are specification decisions made before anyone climbs a ladder.
- The flashing has to match the covering. Driven rain on an exposed pitch travels sideways and upwards, not just downwards. A flashing kit made for the exact tile or slate profile on your roof will shed that. A universal kit dressed into a deep-profile tile leaves channels for water to track along, and it will hold for a while before it does not.
- Fixings and frames want to be specified for exposure. Factory powder-coated aluminium on the outer face rather than site-painted timber, and fixings that are up to the job of holding a sealed unit down in an uplift, are ordinary sense on a hilltop.
- Noise is part of comfort. A loft bedroom under a single sheet of glass on exposed ground hears the rain and hears the wind. A thicker laminated inner pane, or a triple-glazed unit, makes a real difference to what a bedroom sounds like at three in the morning in a February gale.
Ventilation runs into the same weather. An opening rooflight left cracked open on a breezy day up here is not the same proposition as it is in a sheltered valley, which is one reason an electric opening unit with a rain sensor earns its place on this stock, particularly in a roof where the best position for light is above head height anyway.
Choosing the glass for a Langdon Hills roof
Two numbers do the work and they pull against each other. The U-value describes heat leaving through the assembly in winter, measured in watts per square metre per kelvin, and lower is better; Part L of the Building Regulations decides the standard a new unit has to reach. The G-value describes solar energy coming in through the glass, scored from 0 to 1. Ordinary clear double glazing passes roughly 0.6 of what hits it. Add a solar-control coating and the figure drops to somewhere near 0.3. Same view, same opening, about half the heat.
| Glazing | U-value, W/m²K | G-value | Where it fits on this hillside |
|---|---|---|---|
| Clear double | around 1.6 | around 0.6 | North-facing pitches with rising ground behind them, and rooms used mainly through the colder half of the year |
| Solar-control double | around 1.4 | around 0.3 | Any pitch pointed at the open southern view, which on these plots is the one you want the glass in |
| Solar-control triple | around 1.0 down to 0.8 | around 0.3 | Bedrooms in a roof on exposed high ground, where warmth at night and quiet in a gale both count |
| Solar control, laminated inner pane | around 1.4 | around 0.3 | Flat and near-flat glazing over extensions and reroofed conservatories, looking straight up at a high summer sun |
| Obscure laminated with solar control | around 1.4 | around 0.3 | Side elevations with less than 1.7 metres between the floor and the unit, where obscure glass is required in any case |
Those figures are industry-general and they move with the manufacturer, the size of the unit and the exact build-up, so read them as the shape of the choice rather than as a quotation for your roof. The reasoning is set out at more length on our page about energy-efficient skylight installation. The short version for a house up here: an opening of sensible size in properly specified glass beats a larger one that spends the summer behind a blind, and an internal blind is a poor substitute anyway, since it stops the light only after the heat has already come through the pane and into the room.
Planning permission, Basildon Borough Council and Building Control
Basildon Borough Council is the planning authority for Langdon Hills and it is also the Building Control authority. Everything below is general guidance. Only the council can confirm what applies at your address, which is why the position gets checked at survey rather than assumed from the road.
On an ordinary house, a rooflight is normally permitted development and no planning application is needed. The tests are dimensional. The finished unit has to stay within 150 millimetres of the roof surface it sits in, nothing may end up higher than the top of the roof, and a unit going into a side elevation with less than 1.7 metres between it and the floor needs obscure glass and its opening restricted. Meet those and the work goes ahead without an application.
Several situations sit outside that default, and a few of them turn up more often on hillside plots with big houses on them:
- Previous work counts. Large detached houses here have frequently taken an extension, a garage conversion or a loft conversion already. Rooflights themselves are not usually the thing that eats an allowance, but where a proposal is tied into a wider alteration, what has gone before changes what remains available.
- Listed buildings need listed building consent for roof work, whatever permitted development would otherwise permit.
- Flats and maisonettes hold no rooflight permitted-development rights at all, so a converted property sits in a different position from an undivided house.
- Designations do not follow street names. The borough contains older settlements and open country as well as planned housing, and any designation attaching to your address will show on the council’s mapping. One enquiry settles it, and it is cheaper than a mistake.
- Covenants bite separately. On some estates a restriction in the title deeds can rule out an external change the council has no interest in at all.
Where consent is required, the specification is what carries the application: a unit sitting flush within the plane of the covering, a slim dark external frame rather than white plastic, a glazing bar breaking a wide pane, and a position off the elevation that reads publicly. Given how visible roofs are from further down this hillside, that last point is worth more here than it would be on flat ground. Nobody can promise consent, and we will not pretend otherwise. What we can do is put forward the version a case officer is able to agree to.
Building Regulations are a separate matter from planning and they apply either way. Forming a new rooflight opening, or making an existing one bigger, is notifiable. Part L sets the thermal performance the unit has to reach. Part K is the safety side, glazing and guarding, and it is why the pane facing down into the room is laminated. We make that notification to Basildon Borough Council on your behalf, so there is nothing for you to fill in and nothing to chase.
Scaffold, sloping ground and the long way round
Access on these plots is generous in every way except the one that matters most, which is level ground.
Most Langdon Hills properties have a driveway, room for a van and no need to carry anything through the hall. What they also have is a fall across the plot. Scaffold standards need firm, level bearing, and on a sloping drive or a garden that steps down behind the house that means proper foundation work: boarding to spread the load, adjustable bases to take up the difference, and in places a stepped design rather than a single lift running level with the ground. Terraced gardens make this sharper, because retaining walls, raised beds and the edges of terraces are the last places you want to stand a loaded standard. None of this is difficult. It is simply designed at survey instead of improvised on the first morning.
Working height is the other one. Where the ground falls away behind the house, the rear roof can be a full storey further up than the front, so a job that looks like a tower from the driveway turns into a proper scaffold once you walk round the back. Getting that right at the survey is the difference between a two-day job and a two-day job with an extra day in it.
Then there is distance. Wide plots mean long carries, and a glazed unit of 1.2 by 1.2 metres is an awkward two-person lift with nowhere good to put your hands. Side gates are the usual pinch point, since plenty of them are narrower than the unit that has to pass through, and a route worked out in advance beats a route worked out with the glass already off the van. A few properties on this hillside sit on narrow approaches with nowhere for a delivery vehicle to turn, which is a logistics question rather than an obstacle, and one that is much easier answered a week ahead.
What usually goes onto a Langdon Hills roof
Matching the unit to the covering, the structure and the aspect is where the skill sits. On this stock it tends to resolve like this.
| What you have | What usually suits it | Reasoning |
|---|---|---|
| Interwar detached or bungalow, cut purlin roof, clay tile or pantile | Standard roof windows sized between rafters, flashing kit matched to the tile profile | The structure trims easily and the covering profile, not the unit, dictates the weathering detail |
| Large detached with a rear pitch facing the southern view | A pair of solar-control units set flush in the plane of the tiles | Two openings spread daylight across the room, and flush units read quietly from the ground below the hill |
| Loft conversion or room in the roof on exposed high ground | Solar-control triple glazing, at least one opening unit for cross ventilation | A room inside a roof gains heat on every surface at once and hears every gust |
| Reroofed conservatory or solid-roofed garden room | Two or more fixed rooflights, or a roof lantern, solar-control glass throughout | The solid roof took the daylight out of the room; near-horizontal glass has to earn it back without the July heat |
| Flat-roofed rear or side addition | Kerb-mounted flat glazing laid to a fall, solar control | Glass set dead level holds water and dirt, and horizontal panes meet high summer sun almost square on |
| Trussed roof on later housing | Openings sized to the truss spacing, or a designed structural alteration first | A truss is engineered and cannot be cut to suit a window position |
| High glazing above head height in a tall room | Electric opening unit with a rain sensor | A vent nobody can reach never gets used, and hot air leaves fastest from the highest point |
A fair number of roofs on this hillside already carry glass that has come to the end of its life. A sealed unit that has misted between the panes has failed for good, and plastic glazing yellows and clouds under years of ultraviolet with no way back from it. Taking the old unit out and installing a properly specified one in its place is a replacement, which is our work, and it moves faster than a new opening because the hole and the trimmers are already there. It is also the natural moment to move from clear glass to solar control if the original never had it. Where the real problem turns out to be the roof covering rather than the glazing, a roofer is the right trade and we will say so.
Every installation carries a ten-year workmanship guarantee, and there are over fifteen years of putting glass into south Essex roofs behind the way we specify these jobs. Indicative figures by unit type sit on the skylight costs page.
Common questions about rooflights in Langdon Hills
Which council do I deal with?
Basildon Borough Council, for planning and for Building Control alike. We make the Building Control notification for your installation, so that side is handled as part of the job. Anything to do with a designation at your address is a single enquiry to the same council, and it is worth making before a unit is chosen.
Do I need planning permission for a rooflight here?
On a house, usually not. A unit staying within 150 millimetres of the roof surface and sitting below the highest point of the roof is generally permitted development. Flats, maisonettes and listed buildings are the standing exceptions, and any designation applying to a particular address shows on the council’s mapping. Treat this as general guidance and confirm your own property before ordering anything.
My rear roof faces the view. Will a rooflight cook the room?
With clear glass on this hillside, quite possibly. That pitch has an open horizon and nothing shading it, so it takes sun for the length of the day through the summer. With solar-control glass near a G-value of 0.3, an opening unit to let hot air out at the high point, and an opening sized for the room rather than for the view, the same roof is comfortable in August and still gives you the view in January.
Is a north-facing slope worth glazing at all?
Yes, and on some of these plots it is the better choice. North light is steady and does not swing about through the day, which suits a study or a kitchen you work in. It is also the one aspect up here where clear glass genuinely earns its place, because heat gain never builds and every bit of warmth is welcome.
We replaced our conservatory roof with a solid one and the room went dark. Can rooflights put the daylight back?
That is exactly the situation rooflights are for. A solid replacement roof makes the room usable in winter and takes away almost all its daylight at the same time, since a conservatory got most of its light from overhead rather than through the sides. Two or more units in that new roof put the daylight back without giving up the insulation, and solar-control glass keeps the summer performance you gained.
Does being up on the hill change anything about the install?
It changes the detail rather than the job. Wind picks up over a rise, so flashing matched to your actual roof covering, sound fixings and a frame specified for exposure all matter more here than they do on sheltered ground. It also changes the scaffold, because sloping plots need levelled, properly founded support rather than a standard arrangement dropped onto the grass.
How long does an installation take?
A single roof window in a straightforward pitch is usually a day. A pair in a converted roof runs to a day or two. Flat glazing or a lantern over an extension depends on the upstand and the size of the opening. On a sloping plot, add the access time rather than the working time.
We install throughout Langdon Hills and the wider south Essex towns, from the older detached houses and bungalows on the hillside to the larger modern roofs that replaced some of them. Start with which way your best pitch is facing and how much open sky sits in front of it. On this hill, that answer decides the glass, and the glass decides whether you enjoy the room in July.
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