Roof Lantern Installation
Flat-roof glazing sized to the room and detailed into the kerb below it.
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Braintree district
Rooflight installation in Witham
Market town, Georgian core, big estates. What that means for getting glass into a roof here is the whole of this page.
We travel to Witham
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WithamTown covered
Braintree districtWithin
30Mile radius by road
10Year workmanship guarantee
In Witham
What we install on Witham roofs
Flat Roof Rooflight Installation
Flush and kerb-mounted units into single-ply, felt and GRP flat roofs.
View this service →Roof Window Installation
Roof windows trimmed into slate, clay and concrete tile without proud flashing.
View this service →VELUX Window Installation
We install VELUX alongside Fakro, Keylite and Roto roof windows.
View this service →Electric and Opening Rooflights
Actuated opening units, rain sensors and controls, wired and commissioned.
View this service →Energy Efficient Rooflights
Specified on U-value and g-value, not on the brochure photograph.
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The local detail
16 things worth knowing about Witham roofs
Witham is really two towns that happen to share a station. There is the historic one: Chipping Hill around the church, and the long Georgian sweep of Newland Street with its wide frontages and its listed fabric. Then there is the town that arrived after the London overspill agreements of the nineteen fifties, when Witham took planned expansion and grew estate by estate to several times its former size.
A rooflight job here depends almost entirely on which of those two you are standing in. One needs consent, careful salvage of handmade tile and a unit that reads as historically plausible. The other needs a truss layout, a deep profile flashing kit and a conversation about what can be cut. Sunspire covers Witham from Chelmsford along with the rest of the areas we cover map, and the specification is settled on the roof rather than in advance.
- 01 Newland Street and the estates, and why they need different work
- 02 Georgian frontages, and the roof hidden behind them
- 03 Listed frontages, and what a consent application has to show
- 04 Chipping Hill, and the older core around the church
- 05 Timber framed cottages, and roofs that were never set out
- 06 Crittall steel windows, and matching a rooflight to them
- 07 The overspill estates, and how those roofs are built
- 08 Flat roofed link sections on the estate housing
- 09 Timber frame houses, and the layer that has to stay continuous
- 10 Converting a loft for the commute
- 11 The escape opening a converted floor needs
- 12 The Brain valley, and drainage on the low side of town
- 13 The main line, and glazing near it
- 14 Newer housing, and the details it already has
- 15 Notifying a Witham installation
- 16 What moves a Witham figure
Newland Street and the estates, and why they need different work
Walk from the church down to the station and you pass through three or four building generations in twenty minutes. Timber framed and weatherboarded cottages at Chipping Hill. Eighteenth century brick frontages along Newland Street, several of them with parapets and mansards. Interwar ribbon development along the approach roads. Then the planned estates, layer on layer, from the fifties through to housing being finished now.
Each generation carries its own structure, covering and constraint, and pricing a Witham job without knowing which one is guesswork. The single most useful thing to establish at the first email is the approximate age of the house and whether it sits inside the town centre conservation area, because those two answers narrow the specification more than the room size does.
Listed frontages, and what a consent application has to show
Newland Street carries a high density of listed buildings for a town of this size, and listed building consent is a separate permission from planning. It applies to the interior as much as the exterior, and it is usually the historic roof structure rather than the external appearance that a conservation officer is protecting.
The proposals that get through share a shape. A unit sized to fit between existing rafters. No principal timber cut, no purlin notched, nothing that could not be taken out again leaving the roof as it was. A flush cast frame with a central glazing bar, which is what a conservation rooflight is made for. Establishing this early changes the product rather than just the paperwork, so it belongs at the start of the conversation.
On a listed Newland Street roof, the design that gets consent is the one that could be reversed.
Chipping Hill, and the older core around the church
Chipping Hill is the original settlement, and it looks nothing like the High Street. Smaller houses, some timber framed and boarded, plain clay tiles and pantiles, irregular building lines and short runs of roof.
Handmade plain tiles are cambered in two directions, so they bear on each other at points rather than across flat surfaces. Stripping back around an opening will break a proportion of them, and that is planned for rather than discovered on the day. The method is to lift carefully, sort what is sound, re-lay the best of the salvage where the roof is seen and keep any new tile for courses that are hidden. The flashing kit for a plain tile roof uses soakers dressed between the courses rather than an apron over the top.
Timber framed cottages, and roofs that were never set out
Open up a genuinely old roof at Chipping Hill and the drawing is of limited use. Rafters are hand cut from irregular stock, spacings wander between about three hundred and fifty and six hundred millimetres within the same slope, timbers are cranked, and the plane of the roof follows the timber rather than a string line.
Two things follow. Standard unit widths that assume four hundred or six hundred centres frequently will not drop between two adjacent rafters without trimming. And a frame set true will not sit flush to a slope that is not. Both are resolved by measuring the actual opening after the covering has been stripped back, which is why a survey on a building of this age involves lifting tiles rather than looking from the ground with a laser.
Crittall steel windows, and matching a rooflight to them
Steel windows are part of the visual language of this part of Essex, and plenty of Witham houses carry them, original or replaced like for like. They are defined by very slim sightlines and a grid of small panes.
That has a direct bearing on rooflight choice. Set a broad white plastic surround into a roof above elevations glazed in slim steel and the mismatch is obvious from the garden. A slim dark frame with a central glazing bar sits with them naturally, which is why the conservation pattern of unit is frequently the right aesthetic call on a house that is neither listed nor in a conservation area. Where the elevation is steel throughout, a dark grey or black powder coated frame carries the theme across to the roof.
The overspill estates, and how those roofs are built
The planned expansion from the late fifties onwards gave Witham a very large stock of estate housing, and it is not uniform. Early phases are traditional cut roofs or early trusses with concrete interlocking tiles. Later phases are fully trussed. Some blocks use link-detached layouts with a flat roofed section joining the houses.
Establishing which you have is the first job in the loft. A cut roof with rafters, a purlin and a binder can be trimmed like any traditional roof. A trussed roof cannot. The two look similar from the ground and they lead to completely different quotes, which is why nobody sensible prices this stock from a photograph of the outside alone.
| Witham house type | Roof structure | What it allows |
|---|---|---|
| Chipping Hill cottage | Hand cut, irregular spacing | Size set after strip back |
| Newland Street town house | Mansard or shallow behind parapet | Hidden position, gutter governs |
| Interwar semi | Cut roof, purlin at mid span | Standard trimmed opening |
| Overspill estate house | Early truss or cut roof | Checked in the loft first |
| Later estate and new build | Fink truss at 600 centres | Narrow units between trusses |
Flat roofed link sections on the estate housing
The link-detached and terraced-link layouts used across the expansion estates put a flat roofed section between or beside the houses, often over a garage or a utility room, sometimes over a through passage.
Those decks are the easiest positions in the town to work in and the ones where detailing is most often skipped. There is no flashing kit on felt, GRP or single ply: the membrane itself is dressed up the face of the kerb and terminated beneath the unit, so the kerb is built first, square, level, and with the deck falling away from it. Where the deck abuts the house wall, the covering rises up that wall into a chased flashing, and the kerb keeps its one hundred and fifty millimetres above the finished surface at that end too.
Timber frame houses, and the layer that has to stay continuous
A proportion of the housing built in Witham during the seventies and since is timber frame rather than masonry cavity construction, and that changes what happens at the edge of a new opening.
A timber frame roof and wall build-up relies on two membranes doing opposite jobs. A vapour control layer on the warm side keeps moisture out of the structure, and a breather membrane on the cold side lets any that gets in escape. Cutting an opening interrupts both. The detail is to lap the vapour control layer around the reveal and seal it to the frame of the unit, and to dress the breather membrane out over the trimmer so water is shed onto the covering rather than into the timber. Neither is visible once the plasterboard goes on, which is exactly why they are left out.
Converting a loft for the commute
Witham is a commuter town with a fast service into Liverpool Street, and loft conversions for an office or a fourth bedroom are among the most common reasons anybody calls about a roof window here.
In a trussed roof the conversion is a structural project before it is a glazing one. Webs and the bottom chord carry load and are not cut without a designed replacement, so new floor beams take the load off the ceiling ties and purlins or a steel replace the bracing. Only then does an opening become straightforward. Where the roof stays as built, a roof window fits between two trusses at six hundred centres, which caps the clear opening at around five hundred and fifty millimetres. Two narrow units side by side deliver a comparable area of glass.
The escape opening a converted floor needs
Where a loft conversion creates a habitable room, Part B may require an opening that can serve as a means of escape, and in a roof room the rooflight is usually the only candidate.
An escape window has to provide a minimum clear opening area, minimum clear width and height, and the bottom of that opening must sit within a defined range above the finished floor. That combination rules out some unit types outright, because a centre pivot with the pivot at mid height does not leave a clear route through. A top hung unit that swings wide does. The decision therefore sets the model, the size and the position all at once, and it is made at design stage rather than discovered at inspection.
The Brain valley, and drainage on the low side of town
The River Brain runs through Witham to meet the Blackwater below the town, and the ground either side of it is low and flat. Rainwater does not leave a roof quickly in that kind of ground, because the drainage it discharges into is already working at shallow gradient.
On a flat roof down there the margin is thin. Outlets are often small, runs are long, and a deck laid to a nominal fall thirty years ago has usually lost some of it to deflection. Water standing more than about forty eight hours after rain is ponding, and ponding against a kerb finds any weakness in a detail eventually. The right order is to establish where the water currently goes, sort the fall if it has gone, then set the glass into a roof that sheds properly.
The main line, and glazing near it
The Great Eastern main line runs straight through Witham, and the A12 passes the town on the other side. Plenty of housing sits close enough to one or the other for noise to be a genuine input into a glazing specification.
Rain on glass is the noise people ask about, and laminated glass in the outer pane damps the drumming because the interlayer absorbs vibration a monolithic pane simply passes on. The same choice helps with external noise, and an asymmetric unit where the two panes differ in thickness performs better again, because differing thicknesses break up the resonance rather than reinforcing it. Both are order-stage decisions that cannot be added later. There is more on this on the energy efficient rooflights page.
Newer housing, and the details it already has
The most recent development in Witham is built to a very different standard from the overspill estates. Deeper insulation at rafter or ceiling level, continuous membranes, tested airtightness and, on many plots, an overheating assessment behind the design.
Two things follow for a rooflight. The build-up is thick, so the reveal between the ceiling and the glass is deeper than it is in an older house, which makes splaying that reveal worth doing rather than optional. And a house designed to a modelled overheating standard has assumed a particular glazing area and g-value, so adding glass to a south facing plane without matching solar control glass to it will show up on a July afternoon. Newer estates also frequently carry planning conditions restricting roof alterations, so that gets checked before anything is ordered.
Notifying a Witham installation
New rooflights and replacements into existing openings are both notifiable work in England. Part L governs thermal performance, Part K applies where there is a risk of falling through or from an opening, and Part B covers escape from a habitable room in a roof.
Sunspire handles the notification as part of the job, through the district authority or an approved inspector as the programme suits. Where a listed building or a conservation area is involved, the consent runs alongside the notification rather than instead of it, and the two are progressed together. The benefit arrives at sale, when a solicitor asks for a completion certificate and one exists.
What moves a Witham figure
The quote comes in two stages: a range by email once the house age, roof type and rough size are known, then a fixed written price after a survey, with the unit named by manufacturer, model, external size, glazing specification and frame finish, and the workmanship carrying a ten year guarantee.
What moves the number is consent, structure and covering, in that order. A listed frontage changes the product first. A trussed roof that needs an engineer changes the programme. Salvaging handmade tile around an opening at Chipping Hill takes longer than dressing a single ply membrane on an estate flat roof. Send a photograph of the roof from outside, one of the ceiling from inside, and the approximate age of the house. Typical ranges by job type sit on the costs page.
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We start with the building, the covering and the slope. Then we tell you what will suit it, and what it will cost, as a fixed written number.
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