Rooflight and skylight installation in Wivenhoe

The old town

Steep pitches, cut roofs, clay plain tile and slate, small plan depths, and buildings that sit directly on the street with no frontage at all.

The conservation area covers most of it and listed buildings are scattered through it. Those are separate regimes. A listing removes permitted development entirely and requires listed building consent for a rooflight on any slope, visible or not. A conservation area on its own does not, unless an Article 4 direction is in place, which is worth confirming with the council rather than assuming either way.

Where consent is needed, a conservation rooflight is what gets approved: low profile, upright in proportion, central glazing bar, matt black finish. On a rear slope screened from every public vantage point, a case can sometimes be made for a standard unit, and it is worth asking rather than assuming the expensive product is compulsory.

Access down here is the hardest part of the job. The streets are narrow, parking is limited, frontages are directly onto the pavement, and side access to the rear frequently does not exist. Scaffold on the highway needs a licence from the county council and time to arrange, and where there is no side access, materials and scaffold sometimes have to come through the house. All of that is normal and it needs planning at survey rather than improvising on the day.

Coastal exposure

Worth taking seriously here in a way it is not five miles inland. Properties near the river and toward the estuary take driving rain and salt laden wind, and both affect specification.

Salt accelerates corrosion, which matters for fixings, flashings and any exposed metal finish. Stainless fixings rather than plated, and a durable powder coating on any steel unit, are worth the small premium.

Driving rain matters more than total rainfall for a roof window, because it is wind driven water finding its way under a covering rather than running down it. That puts more of the work on the flashing detail and the underlay collar, and it is where an installation that would be fine in a sheltered position starts to let water past.

Wind loading is the third. A large rooflight or lantern in an exposed position needs checking against the loading for the site rather than assumed from a catalogue, particularly on an opening unit where the sash is a sail when open.

The twentieth century housing

Up the hill the picture is ordinary and much easier. Concrete interlocking tiles, pitches around 30 to 35 degrees, cut roofs on the earlier properties and trussed rafters on the later ones, driveways, space to stand a tower, and no conservation designation.

This is where most of our Wivenhoe work is, and it is straightforward: roof windows into rear slopes, flat roof skylights over rear extensions, and replacement of units fitted in the 1980s and 1990s.

The newer development

Modern estate housing with trussed roofs and shallow pitches, where daylight work happens over extensions rather than in the main roof, and where deed covenants restricting alterations to street facing elevations are worth checking before rather than after.

On those shallow pitches the flashing kit matters more than it does on a steep roof, because less water sheds naturally. And the reveal is longer, so splaying it rather than boxing it square makes a real difference to how much light reaches the room.

What to send us

A photograph of the roof, one of the frontage so we can see the access, and the address so we can check the designation. For a replacement, the data plate. If you are in the old town, tell us whether there is side access to the rear, because that single fact changes the shape of the quotation more than anything else.

Salt

Salt laden air accelerates corrosion on anything metallic. Three practical answers.

Stainless steel fixings throughout rather than plated ones, which cost very little more and do not bleed rust down a slate roof in five years.

A durable powder coated or anodised finish on any exposed frame, and on a steel conservation unit a periodic check for damage to the coating, because exposed steel corrodes where timber and aluminium do not.

Aluminium clad timber rather than bare timber where the position is genuinely exposed. The cladding takes the weather and the timber stays dry behind it.

Driving rain

Matters more for a roof window than total rainfall does, because wind driven water is pushed under a covering rather than running down it.

That puts the load on two details. The underlay collar, dressed and lapped so that water reaching the membrane passes around the opening rather than into it. And the flashing kit, which must be the correct profile for the covering and correctly lapped, because a universal kit that would be adequate in a sheltered position will let water past in an exposed one.

This is the detail we are most careful about on riverside work, and it is entirely invisible when the job is finished.

Wind loading

A large rooflight or lantern in an exposed position should be checked against the wind loading for the site rather than assumed from a catalogue. It matters most on opening units, because an open sash is a sail and the stay and the actuator have to hold it.

A rain sensor on a motorised unit is worth more here than almost anywhere, because weather arrives quickly off the estuary and a window left open in a squall is a wet room and a stressed mechanism.

Condensation and ventilation

Riverside properties frequently run damper than inland ones, and older houses near the quay hold moisture in a way modern ones do not.

Water forming evenly on the inner face of the glass on cold mornings is condensation, not a leak, and no work on the window will fix it. What fixes it is moving air: an opening at the highest point of the room lets warm moist air leave and draws drier air in through anything open lower down.

Water forming on the plastered reveal rather than the glass is different and usually is a fault, almost always a missing insulation collar. It is a separate order line, it is the first thing dropped from a cheap quotation, and the symptom appears months later.

Costs, and what moves them here

In the old town, access dominates. No off street parking, frontages onto the pavement, a highway licence for scaffold, and sometimes no side access to the rear at all so materials come through the house. That is a real line on the quotation rather than a rounding error, and it is why we establish it at survey.

Up the hill and in the newer development it is ordinary: driveways, space to stand a tower, and single storey work that rarely needs scaffold at all.

Doing several units at once is the reliable saving anywhere, because access is a fixed cost shared across everything done on the same visit. In the old town, where access is the largest line, that saving is proportionally bigger than anywhere else we work.