Clear SkylightsCrawley

Kent · 22.7 miles from Crawley by road

Rooflights and skylights in Westerham, inside and beside the Green

Westerham packs a conservation area, about 100 listed buildings and three main roads into a small town. We fit rooflights and skylights to suit each roof, check the planning position for your address, and write down the glass we choose.

Get a quote What is a quiet spec?

A rear extension at dusk with light glowing through its rooflights
Planning
Sevenoaks District Council, Kent
Homes
Timber frames, red brick and ragstone, many listed
Roofs
Read in the loft and on the slope at the survey
Setting
Darent valley town where three main roads meet

Listed frames, brick and ragstone walls, and three roads at one junction

  • Listed and protected frames

    The conservation area holds about 100 listed buildings, so the record for your address is read before any opening is drawn.

  • Three roads into town

    The A25, A233 and B2026 meet here, and a loft slope that faces them hears a steady band of road sound.

  • Flat glass at the back

    A rear extension with a lantern drums in a downpour unless it has laminated glass and a built-up upstand.

  • Flush units on quiet slopes

    A slim roof window on an unseen rear slope brings daylight in without changing how the street roofline reads.

Loft bedroom on a road-facing slope, put into writing

A brick house near the centre of Westerham, set down as a written spec would record it. Your own quote would carry a spec drafted after we have sat in the actual room.

Room:
rear-slope bedroom under the roof of a brick home near the A25
What we would listen for:
the steady road band at night, and rain on the roof in a wet spell
Glazing:
laminated acoustic inner pane, unequal outer thickness, a low-conductivity spacer bar
Seals and upstand:
gaskets kept under compression, flashing cut to the covering, trimmers sized for the rafters

Noise out hereStill in here

The survey file

Rooflights in Westerham

Westerham is a small Kent town with a great deal of protected ground packed around its centre. A rooflight installation in Westerham starts with the question of where your house sits: inside the conservation area, beside it, or out among the fields. This page follows the town as the planning documents describe it, then turns to the glass, seals and upstand we would choose for the rooms people actually want to light here.

Small town, three roads

Where the A25, the A233 and the B2026 meet

A compact Kent town on the Darent, where a short list of roads decides how it sounds and how people arrive.

Westerham is a town and civil parish in Sevenoaks District, on Kent's borders with Surrey and Greater London. Three main roads come together in the town, and the M25 runs to its north.

The 2021 census recorded 4,498 residents. That is a modest number, and it explains the feel of the place. There is one compact centre, one river, and a short list of roads that decide how the town sounds and how people arrive.

The River Darent flows through the town. The A25 crosses it, the A233 leads off towards Bromley, and the B2026 runs south to Edenbridge. Oxted is 3.4 miles to the west and Sevenoaks is 6 miles to the east. We work from Crawley, and Westerham is 22.7 road miles from us, so a survey is a planned visit with the tape, the ladder and the questions already written down. If you are comparing neighbouring towns, our pages for Oxted and Sevenoaks cover each side of Westerham.

Westerham at a glance

  • 4,498Residents at the 2021 censusA modest number, and it explains the feel of the place.
  • 3.4 milesDistance to OxtedTo the west, on the other side of the town.
  • 6 milesDistance to SevenoaksTo the east.
  • 22.7 road milesDistance from our Crawley baseA planned survey visit.

A rooflight is an opening in the roof with glass in it. A skylight is the same thing under another name. Daylight is the reason to fit one. The second question, which this page keeps returning to, is what else the glass lets into the room below.

NextSevenoaks District Council decides, and the address decides what it decides

Who decides, and where

Sevenoaks District Council decides, and the address decides what it decides

Sevenoaks District Council is the planning authority, and the house decides how tight the limits become.

The local planning authority for Westerham is Sevenoaks District Council, with Kent as the county. Any rooflight question in the town goes to the district, not to Surrey and not to a London borough, even though both are close enough to see from the higher ground.

For an ordinary house outside any protected area, a roof window set into the existing slope is usually a modest change, with limits on how far the unit stands proud of the roof plane and on which slopes face the highway. Those limits tighten for flats, for listed buildings and wherever the council has removed permitted development rights. Our guide to planning permission for rooflights and skylights sets out the general tests.

Westerham is an unusual case because so much of it is designated. Whether a particular house is listed, inside the conservation area, or neither, is something we check for the address. We look at the council's own records, tell you what they say, and only then draw the opening. We do not guess a status from the look of a front elevation, because a plain Victorian frontage can stand inside a designated area and a handsome old one can stand outside.

Where the limits tighten

  • Flats Permitted development limits tighten.
  • Listed buildings Listed building consent is a separate process.
  • Removed rights Wherever the council has withdrawn permitted development.
  • A slope facing the highway Limits apply to which slopes face the road.

A separate duty runs alongside planning. Building Regulations apply to a new rooflight whether or not the council needs an application. Rooflights fall under Approved Document L for thermal performance, Approved Document B where a roof is close to a boundary, and Approved Document F where the new opening changes ventilation. We install to current Building Regulations and we handle the Building Control notification where the work is notifiable. The plain version is in our guide to Building Regulations for rooflights.

NextA conservation area of about 36 hectares and some 100 listed buildings

Looked at twice

A conservation area of about 36 hectares and some 100 listed buildings

With about 36 hectares and some 100 listed buildings, much of the centre is judged for what it is and what it is listed as.

The Westerham Conservation Area covers about 36 hectares and holds about 100 listed buildings. It was designated in 1973 and extended in 1994. For anyone planning roof glazing, those figures describe the real constraint: a large share of the town centre is looked at twice, once for what it is and once for what it is listed as.

Sevenoaks District Council's appraisal names the landmarks that define the area. They include St Mary's Church and the Green, the Squerryes Court estate, Quebec House, Pitts Cottage and the Kings Arms Hotel. A rooflight is rarely going to be seen from the Green itself. The test the council applies is nearer than that: can the opening be seen from a public road, a path, or another protected building, and does it change how the roofscape reads?

That shapes the product before any question of finish. Inside a conservation area the sensible choices are:

  • A low-profile unit set flush. The glass sits close to the roof plane, without a raised kerb catching the light on the slope.
  • A slim frame in a recessive finish. The frame should read as part of the roof rather than as an object on it.
  • A position on the rear or an unseen slope. The same daylight arrives from a slope that faces the garden instead of the street.

What the council weighs in the roofscape

  • A public roadCan the opening be seen from it?
  • A pathOr from another route through the area.
  • Another protected buildingDoes the opening change how its roofscape reads?
  • The unit chosenLow profile, slim frame, rear or unseen slope.

Our page on conservation rooflight installation explains the flush-fit units in detail. For a listed house the decision is different again, because listed building consent is a separate process from planning permission, and it is the council's conservation officer who reads the drawings.

NextBrick, stone and tile-hung timber: reading the walls before the roof

Walls before roofs

Brick, stone and tile-hung timber: reading the walls before the roof

Timber frames, brick, ragstone and tile-hanging each tell us something before we reach the roof.

The conservation appraisal is full of useful material about how Westerham is built. Many timber-framed buildings survive, some clad in brick, weatherboarding, tile or render. Some have vertical tile-hanging or painted weatherboarding on the first floor.

Brick leads among the walling materials, in local red stock bricks with blue headers and colour banding. Local stone is used too, both ragstone and limestone and sandstone, alone or alongside brick, including in walls and paving. The appraisal describes ragstone and brick boundary walls as an important part of the area's character.

A house made of these materials teaches us three things before we reach the roof.

What the walls tell us

  • A timber frame cut to fit itself Rafters may not be evenly spaced.
  • Heavy brick or stone gables They carry weight well.
  • Tile-hung upper storey A lighter timber frame sits behind the tiles.
  • A covering that varies We read it on the day and choose the flashing to suit.

The first is that a timber-framed house has a frame that was cut to fit itself. Rafters may not be evenly spaced, and a beam that looks like decoration from inside may be carrying the slope. An opening is drawn from what is found in the loft. It is not taken from a catalogue spacing, and it may have to sit between two timbers of different age.

The second is that old walls are heavy and forgiving in different ways. A stone or brick gable carries weight well. A tile-hung upper storey has a timber frame behind the tiles that is lighter than it looks. Where a new opening is trimmed into an old frame, the load has to be carried around it with a properly sized trimmer, and the trimmer is fixed to something that was built to take it.

The third is that the roof covering itself varies. The appraisal speaks of walls and cladding, and it does not give a single roof covering for the town, so we make no claim about one. We read the covering on the day, lift a sample where we need to, and choose the flashing kit and the upstand to suit what is there.

NextGreen Belt and two protected landscapes at the edge of town

Edge of town landscapes

Green Belt and two protected landscapes at the edge of town

Green Belt, an AONB and a registered park are about setting more than glass, and they are checked for the address.

The 2015 appraisal says the countryside surrounding Westerham is Green Belt and an Area of Outstanding Natural Beauty. It cites the management plans for both the Kent Downs and the High Weald AONBs. Squerryes Court adds another layer: it is a Grade II registered historic park and garden, with 9 hectares of gardens and 60 hectares of parkland and woodland, overlapping the south-west of the conservation area.

For a rooflight, these designations matter in a different way from listing. They are less about the glass and more about the setting. A house on the edge of the town, looking out across parkland, may have a roof that is visible from a long way away, and the council can care about how a bright rectangle reads from a distance.

There is also an upside. A house with open ground to one side gets its daylight from a slope that faces away from neighbours, which leaves a generous choice of position. Choosing where to position a skylight comes down to three things: where the sun arrives, where the ceiling is high enough, and where the room underneath needs the light.

Squerryes Court and the appraisal

  • 2015Year of the appraisalIt names Green Belt and an AONB around the town.
  • Grade IIRegistered historic park and gardenSquerryes Court, overlapping the conservation area.
  • 9 hectaresOf gardensWithin the registered grounds.
  • 60 hectaresOf parkland and woodlandOverlapping the south-west of the conservation area.

Green Belt is a planning policy that mostly concerns new building and large extensions. A single roof window in an existing house is seldom the thing it is written for. Even so, where a rooflight forms part of a larger project, such as a rear extension with a lantern, the Green Belt position and the AONB position are both checked for that address before a design is fixed.

NextWhat the road corridors do to a room under the roof

Roads and rain

What the road corridors do to a room under the roof

Road sound is a steady band that a thin pane adds little against, so the answer lies in the glazing build.

The brand angle of this business is quiet light. In Westerham the honest version of that has a short list of sources, and the research on the town names the roads that matter: the A25, the A233, the B2026 and, to the north, the M25.

A road sound is a steady band, not a series of events. A loft bedroom whose slope faces a busy road hears it through the roof, because the roof is the thinnest part of most houses and a single pane of ordinary glass adds little to it. The remedy is in the glazing build. The glass we would propose for a road-facing slope is a laminated acoustic inner pane, a different thickness on the outer pane so the two do not ring at the same pitch, and a cavity that is chosen rather than left to whichever default the catalogue offers. The reasoning is explained in our guide to acoustic laminated glass for rooflights and in the piece on keeping road noise out through a rooflight.

We describe quiet by specification and never by test figures. We record what we heard at the survey and the build we specify in response.

A glazing build for a road-facing slope

  1. 1Outer pane A different thickness, so the two panes do not ring at the same pitch.
  2. 2Cavity Chosen rather than left to a catalogue default.
  3. 3Laminated acoustic inner pane The main answer to a steady road sound.
  4. 4Gaskets Kept compressed so no gap lets sound in.
  5. 5Built-up upstand Lets rain leave the glass quickly.

The second source is simpler and affects every flat roof in every town. Rain on glass is a drumming sound, and it is loudest over a kitchen lantern or a flat-roof rooflight where the glass is close to the people below. The answer is the same family of choices: a laminated inner pane, a built-up upstand so the water leaves the glass quickly, and gaskets that stay compressed. Our page on reducing rain noise under a flat rooflight covers that case, and the roof lantern installation hub shows the products that suit a rear extension.

The research on Westerham gives no source for aircraft noise, so this page does not raise it. The noise we plan for here is road sound, and rain.

NextThe glass, seals and upstand we would propose in Westerham

Matching the spec

The glass, seals and upstand we would propose in Westerham

The table shows how the choices shift with the kind of roof, and sometimes the answer is to do less.

Every quote from us comes with a written quiet spec for the room. The spec records what we heard, the glazing build we propose and the way the upstand and seals are finished. The table sets out how the choices shift with the kind of roof, for the houses this town is made of. The full method is on the quiet spec page.

Listed or conservation street

Likely unit
Flush-fit roof window
Main concern
Appearance from the road
Glass note
Slim frame, laminated inner pane

Timber frame, tile-hung

Likely unit
Roof window between rafters
Main concern
Uneven frame spacing
Glass note
Sized to the frame we find

Brick house, road side

Likely unit
Roof window or rooflight
Main concern
Steady road sound
Glass note
Mixed glass thickness

Rear extension, flat roof

Likely unit
Fixed rooflight or lantern
Main concern
Rain drumming
Glass note
Laminated pane, built-up kerb
RoofLikely unitMain concernGlass note
Listed or conservation streetFlush-fit roof windowAppearance from the roadSlim frame, laminated inner pane
Timber frame, tile-hungRoof window between raftersUneven frame spacingSized to the frame we find
Brick house, road sideRoof window or rooflightSteady road soundMixed glass thickness
Rear extension, flat roofFixed rooflight or lanternRain drummingLaminated pane, built-up kerb

Sometimes the answer is to do less. A flush roof window on a rear slope in the conservation area lets in a generous amount of light, stays out of view and sits inside the frame of the old roof. That is a better result than a larger unit that draws the eye. For a room that needs more light than one window gives, two smaller units on the same slope can be quieter and easier to fit than one large one, because each spans fewer rafters. Our guide on choosing a rooflight sets out the trade-offs.

Energy matters as much as sound. A modern rooflight has to meet the thermal limits in Approved Document L, and in an old house the glass can be the coldest surface in the room. A warm-edge spacer, a low-emissivity coating and a gas-filled cavity are all part of the same specification. The energy efficient rooflights hub explains those choices.

NextHow a survey and an installation run in a house like these

Survey to install

How a survey and an installation run in a house like these

A visit begins in the loft, then the address is checked, then the spec and quote follow together.

A visit to a Westerham house begins in the loft, not on the roof. We look at the rafters, the wall plate, any old alterations to the frame and the state of the ceiling below. Then we stand in the room and listen, with the window shut, for the road and for the quiet.

Then we check the address. The council's records tell us whether the house is listed, whether it stands inside the conservation area, and whether any direction removes permitted development rights. Where consent is needed we say so at once, before you spend on anything. Where it is not, we say that too, in writing.

The spec and the quote follow together. On the day of the install the order of work is steady and tidy:

  1. Protect the room below and the stair up to it.
  2. Strip the covering locally and expose the rafters.
  3. Trim the opening with a correctly sized trimmer and fix the new frame.
  4. Fit the flashing kit to suit the covering, then the glass.
  5. Make good inside, leaving the reveals ready for decoration.

The work carries a 10-year workmanship guarantee. The terms are set out on our guarantee page.

NextWesterham questions about listing, the Green and the flat roof at the back

Questions before booking

Westerham questions about listing, the Green and the flat roof at the back

Four answers on listed houses, living near the Green, flat roofs at the back and how to get a quote.

These are the points to settle when a Westerham house is weighed up for a rooflight.

Can a rooflight go in a listed house in Westerham?

It can be possible, but it needs listed building consent, which is separate from planning permission. The conservation officer at Sevenoaks District Council reads the drawings and looks at the position, the profile and the finish. A flush-fit unit on a rear slope is the kind of proposal that stands the best chance.

Does being close to the Green matter?

It can. The Green and St Mary's Church are at the heart of the conservation area, and the council looks at anything that changes the roofscape around them. A rooflight that cannot be seen from the Green or the road is a different conversation from one that can.

Does a rear extension with a flat roof need the same care?

It needs different care. A flat roof has no rafters to fit between, so the structure is a joist deck, and the upstand is built up around the opening. The glass should be laminated so the room is not loud in rain. See our flat roof rooflight installation hub.

How do I get a quote for Westerham?

Use the quote form on this page, or message us on WhatsApp. Tell us the room and the address. We will check the council position, visit, and write the spec. The wider picture is on our page for skylight and rooflight installation in Crawley.

Near Westerham

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  • Quiet spec included
  • 10-year guarantee

Prefer to message? WhatsApp us or call 01293 974093, or email info@clearskylightscrawley.co.uk.