Skylight Installation in Harleston
- Fixed quote before we start
- Roof never left open overnight
- 10-year workmanship guarantee
- Fixed quote before we start
- 10 years workmanship guarantee
- 25 years fitting rooflights
- Skylights only, not a general roofer
Harleston is a Georgian market town, and the roofs prove it. Walk the centre and you see very little roof at all, because the fashionable eighteenth and nineteenth century thing to do was hide it. A parapet wall carries up past the eaves and the slope sits behind it. Behind that parapet, on the deeper townhouses, the roof is often not one slope but two, an M-shape or double pitch draining inward to a valley gutter down the middle of the building. That arrangement decides almost everything about fitting a rooflight here.
Let us be straight about the distance. Harleston is 24.7 miles from Ipswich straight line, realistically fifty to fifty-five minutes on the road. It is the furthest point we cover into Norfolk and it is the edge of the service area. That does not mean we will not come. It means we work differently: one survey visit that gets everything, then a planned run of consecutive days on site, rather than four short trips with a week between each. We say so up front because it changes how the job is scheduled.
What a parapet does to your options
The usable slope on a parapet roof is often short. The pitch starts behind the parapet, runs up to a ridge maybe two or three metres away, then falls again to the valley. That gives a limited band in which a unit can sit with adequate coverage above and below it.
Any roof window needs a minimum length of covering below it to shed water clear, and enough above that the head flashing is properly lapped by the courses behind. Squeeze a unit near the ridge and the head detail has nothing to lap into. Push it too far down and the apron discharges almost straight into the gutter. On a short slope those two constraints leave a surprisingly narrow set of viable positions, which is why we survey inside the roof space and on the roof itself before quoting anything for skylight installation in Harleston.
The valley gutter is the thing not to compromise
On an M-roof the central valley gutter carries water from both slopes along the building to an outlet. It is usually lead-lined, usually the oldest detail up there, and it is the single point of failure for the whole roof. If it backs up, water goes over the upstand and into the building.
A rooflight sited too close causes two problems. The unit’s apron discharges into the valley in a concentrated stream at one point rather than spread evenly along it, which is how you overload a gutter sized for even flow. And the flashings narrow the effective channel and interrupt the flow down it, so debris catches where it never used to.
Our rule on valley roofs: the unit sits with clear distance from the valley, sized against the length of the slope and the gutter’s outlet capacity, or it does not go there. We would rather redesign the position than sell you a rooflight that quietly shortens the life of the valley below it.
Slate is a different trade from tile
Most of the older Harleston stock behind those parapets is slated, and slate work is set out, not just laid. Slates run to a gauge, the fixed spacing between courses, calculated from the slate length and the head lap the pitch requires. Cut into a slate roof without regard for the gauge and the courses either side of the opening no longer line up, so every slate around the unit gets holed and hung out of position and the head laps go short.
Set the opening out on the gauge and the courses run through cleanly. It takes longer at marking out. It is the difference between work that reads as original and work you can spot from the garden.
The weathering is different too. Profiled tile flashing kits, the ones with a corrugated apron that dresses into a tile roll, do not belong on slate. Slate is flat and thin, so the correct detail is lead soakers, individual pieces dressed up the side of the unit and lapped between each slate course, with a lead apron below and a lead cover flashing at the head. It is slower and it is handwork, and it is the only detail that lasts on a slate roof. That is standard on any pitched roof skylight installation we do on slate, whether the unit is a VELUX, Keylite or Roto roof window or something drawn specifically for the opening through our custom skylight design service.
A Georgian town core comes with conservation control
A market town that kept its Georgian frontages usually kept its conservation designation too, and Harleston is no exception: the centre is a conservation area with a good many listed buildings along it. That has two consequences for a rooflight. On the street-facing slopes, where the parapet does not already hide the roof, consent is likely to be needed and the unit will have to be a flush conservation type rather than a proud modern window. On the hidden slopes behind those parapets, the concealment that makes the roof awkward to work on is also an advantage, because a unit the street cannot see is a far easier case to make.
Listing, where it applies, reaches further than planning does. It covers the whole building including the roof structure and the interior, so cutting historic rafters or a purlin to form an opening is a consent matter in its own right, not just a question of what shows from the pavement. We survey inside the roof space as well as on the covering partly for that reason, to work out whether an opening can sit between the important timbers with the least possible loss of old fabric. Where a property is listed we specify a unit that suits the building and tell you what the application needs to show, though the submission itself is yours to make.
The gutter behind the parapet is a hidden risk
On a parapet roof there is usually a lined gutter running along the back of the parapet wall, between the wall and the foot of the slope, carrying water to a concealed outlet or a rainwater head. Like the central valley it is often lead, often the oldest weathering on the building, and it is completely out of sight from the ground, so its condition is unknown until someone gets up there. It is also the detail most likely to be quietly failing on an old town house, backing up behind a blocked outlet and pushing water over the upstand into the wall head.
A rooflight low on the slope discharges towards that gutter, so its position has to respect the gutter’s capacity and its outlets in the same way a unit near the central valley does. Part of what the survey buys on a Harleston roof is simply eyes on these concealed gutters: whether the lead is sound, whether the outlets are clear, and whether a new rooflight would load a gutter that is already at its limit. It is far better to find a tired parapet gutter at survey, when it can be allowed for, than to fit a rooflight above one that fails the following winter and gets blamed on the new work.
Access on a tight high street
Working on a Georgian town house brings a practical problem the estates never do: there is often no side access and the frontage sits straight onto the pavement. Scaffolding the front means a licence to stand it over a public footway, and sometimes a pavement closure, which the local authority grants and which takes lead time to arrange. So access is something we plan at survey rather than discover on the first morning. Where the work is on a rear or valley slope, we would far rather reach it from the back or through the building with the floors protected than take a scaffold licence for the street, and the parapet layout often makes that possible.
Getting materials up is part of the same thought. A slate roof behind a parapet, reached across a narrow landing and up through a loft hatch, is a different logistics job from carrying tiles up an estate-house scaffold, and it is one reason we plan a Harleston job as a continuous run of days with everything on site before we start, rather than a series of short visits fifty minutes from base.
Slate gauge, in a little more detail
The point about setting slate out on its gauge is worth expanding, because it is where slate rewards or punishes the work. The gauge, the spacing between courses, is fixed by the length of the slate and the head lap the pitch demands: a lower-pitched roof needs a longer head lap, which shortens the gauge and puts the courses closer together, while a steeper roof can run a longer gauge. Get the head lap wrong around a new opening and water blown up under the slates finds its way past the lap and onto the deck, which on a concealed parapet roof can run a long way before it shows inside. So the courses around a Harleston rooflight are set out to the roof’s existing gauge, the slates cut and holed to suit, and the head laps kept honest, so the opening weathers as well as the century-old roof around it. It is slow, careful marking-out, and on slate there is no shortcut that lasts.
How we run a job this far out
One survey visit, thorough, inside and out, including the loft void and the valley. A fixed written quote after it. Then a planned run of days with materials on site before we start, so nothing stalls waiting on a merchant fifty minutes away. Twenty-five years in the trade, a 10-year workmanship guarantee, installed to current Building Regulations. Where the roof structure makes a pitched unit awkward, a rear flat-roof section is sometimes the better host, which moves it to flat roof skylight installation.
Nearby we also cover Diss, Eye and Debenham. The full list is on areas we cover.
Request a fixed quote for Harleston. Tell us whether the roof is slate and whether there is a valley gutter, and we can tell you a great deal before we set off.
You are fifty minutes away. Is that a problem for a Harleston job?
It is a scheduling matter rather than a price one. Travel is inside the quoted figure. What we will not do is treat it as a job we can pop back to, so we survey once and thoroughly, order everything before we start, and book a continuous run of days. Harleston is the edge of our area and we would rather tell you that than pretend otherwise. If a job is genuinely too small to justify the trip we will say so at enquiry.
My roof is hidden behind a parapet. Can a rooflight even go there?
Usually yes, and being hidden from the street is often an advantage for planning. The limitation is the length of slope. You need enough slate below the unit to carry water clear and enough above it for the head flashing to lap properly, so short slopes behind parapets have a narrow band of valid positions. We measure that band at survey and show you what fits inside it.
There is a lead valley gutter down the middle of my roof. Does that rule it out?
No, but it sets the position. A unit placed near the valley concentrates its discharge at one point and its flashings narrow the channel, which is how a gutter that has coped for a century starts backing up. We keep clear distance from the valley, judged against the slope length and the outlet capacity, and if the only place a unit would fit is too close, we say so rather than fit it.
My Harleston house is in the conservation area. Does that stop a rooflight?
Usually not, but it shapes it. On slopes the street can see, expect to need consent and to fit a flush conservation-style unit rather than a proud modern one. On the hidden slopes behind the parapet, being out of sight is an advantage and the case is easier. If the building is also listed, consent covers the roof structure and interior too, so we keep any cutting of historic timber to a minimum and survey inside the roof to place the opening with the least loss of old fabric. We tell you which situation you are in at survey.
Thinking about this job? We survey across Ipswich, Suffolk and north Essex and give you a fixed price before any work starts, with a 10-year workmanship guarantee.