Skylight Installation in Whitton
- 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
The job we get called out to most in Whitton is the back of a semi. Somebody has bought a post-war or ex-local-authority house north of the town, the kitchen is a dark galley at the rear, and the plan is to open the back up. Sometimes that is a single-storey extension with a flat roof and a rooflight in it. Sometimes it is a loft conversion with roof windows in the rear slope. Either way the roof is the constraint, and on a semi the roof is only half yours.
Whitton sits about 1.8 miles due north of Ipswich centre in a straight line, which is a few minutes up the road in practice. Whitehouse and Castle Hill make up a good part of the housing here, alongside rows of post-war semis, and a large share of it started life as local-authority stock.
The party wall decides the position, not the kitchen table
People arrive with a position in mind. Over the island. Above the dining end. On a semi, that plan meets the party wall.
Where a party wall runs up through the roof, it is doing fire separation between two dwellings, and that detail has to stay continuous. A rooflight cannot be trimmed into it, and the structure around it cannot be cut back to make room. There is also the boundary itself to respect, and works touching that wall have their own process.
In practice it means the unit gets set off the wall by a workable margin, which shifts it away from the party side of the room. On a narrow semi that can be a metre of difference, and a metre matters when the room is only three and a half wide. Better to know at survey than after the plasterboard is up. We work this out on the roof and show you where the unit can actually land for a pitched roof installation in the rear slope.
What we find when the tiles come off a re-covered roof
A lot of the ex-local-authority stock around Whitton has been re-roofed or re-covered at some point, under a council programme or after a right-to-buy purchase. That is generally a good thing. It is also a genuine unknown until the covering is lifted.
What turns up on these roofs, more often than anyone would like:
- Mixed battens. Original battens left in place with new ones added, sometimes at different gauges, sometimes undersized against current requirements.
- Replacement felt of unknown age. Bitumen felt that has gone brittle, or a breathable membrane over an older felt that never came out.
- A covering that does not match the original. Concrete interlocking tiles over a roof built for something lighter, or a patchwork where a section was done and the rest was not.
- Fixings and detailing from three different eras in one slope.
None of that stops a rooflight going in. It does change the work around the opening, and sometimes the flashing kit profile. It is exactly why we survey the roof and give one fixed written price afterwards, rather than a number over email that gets revised once the scaffold is up. The quote does not move unless you change the specification.
Rear extension flat roofs and the 150mm rule that matters more
Most single-storey rear extensions going on these semis now get a warm-deck flat roof, with the insulation sitting above the deck rather than between the joists. It is a better build than the cold-deck roofs of thirty years ago and it changes how the rooflight sits.
The kerb has to be built off the structural deck and carried up through the insulation and the waterproofing, so the top of the upstand finishes at least 150mm above the finished roof surface. Not 150mm above the deck. Above the finished level, once the insulation and the membrane are on. That margin is what stops standing water, driven rain and the leaf litter that collects on a low roof from washing back over the kerb and under the unit.
Cut it to 100mm because the ceiling height is tight and you have built a puddle detail. We would rather drop the internal reveal than shorten the upstand. Full detail is on flat roof skylight installation.
Rule of thumb for a Whitton rear extension: the upstand height is not negotiable, the unit size usually is. If the two fight, we change the unit.
Specifying the unit itself
For rear-slope roof windows on the loft conversions, we fit VELUX, Keylite and Roto and match the flashing kit to whatever covering the survey found, which on a re-covered roof is not always what the front elevation suggests.
On the thermal side, a habitable loft or a new extension has to meet Part L for the opening. Modern units run around 1.2 W/m²K against roughly 2.8 for anything fitted in the mid-2000s, and on a north-facing rear slope that difference is felt in January rather than admired on a spec sheet. See energy efficient skylight installation.
Castle Hill and Whitehouse are not the same roof
People treat the north of Ipswich as one lump of housing. On a roof it is not. The Castle Hill side runs older, a good deal of it interwar semi with cut rafters, purlin support and, on the original stock, a clay plain tile or an early concrete tile. Whitehouse and the estates around it lean later and post-war, and by the tail end of that period you start to meet the first prefabricated trusses rather than site-cut timber. That single difference decides whether a rear-slope opening can be trimmed generously or has to fit between fixed members, and it is why we look through the hatch on the first visit rather than assuming from the street. A pair of semis a few roads apart can genuinely give two different answers on the same question.
The chimney stack nobody plans around
A lot of these semis keep a party-wall chimney stack, and even where the fireplaces are long gone the stack usually is not. On a rear-slope roof window that stack is a real constraint, because the unit has to clear it with enough margin to flash cleanly and the back-gutter behind the stack has to stay working. Set a rooflight too close and you crowd the lead soaker and the back-gutter that keep the stack dry, and you have created a maintenance problem next to a brand new window. So the stack, not the kitchen layout, often sets how far along the slope the unit can sit, and it is one more reason the achievable position gets marked on the roof at survey rather than agreed off a sketch at the kitchen table.
The party wall process, in plain terms
Where scaffold has to stand on a neighbour’s ground, oversail their airspace, or where you are cutting into structure near the boundary, the Party Wall etc. Act 1996 can come into play. It sounds heavier than it usually is. In practice it means serving written notice on the adjoining owner, giving them the period the Act allows to respond, and either an agreement in writing or, if it comes to it, a surveyor appointed to settle the detail. Most rooflight jobs on a Whitton semi never need any of this, because the work sits within your own roof and the scaffold stands on your own ground. It matters most on the tight plots and where a rear extension pushes close to the line. We tell you at survey whether your job is one of the ones that triggers it, so the timescale is built into the plan rather than sprung on you halfway through.
Booking a survey in Whitton
Survey on the roof, one written fixed price, 10-year workmanship guarantee, installed to current Building Regulations. Nothing is ordered until it is measured and the roof is never opened waiting on a delivery.
We cover the same ground across north and west Ipswich, including Chantry, Westerfield and Bramford. See areas we cover for everywhere else.
Request a fixed quote for a rooflight in Whitton. Tell us which side the party wall is on and roughly how wide the room is, and we can usually say something useful before the survey.
Can I have a rooflight near the party wall on my Whitton semi?
Not right up against it. Where the party wall carries up through the roof it provides fire separation between the two houses and that has to stay continuous, so the structure cannot be trimmed back to make space. The unit gets set off the wall, which on a narrow semi shifts it noticeably away from where people first imagine it. We mark the achievable position at survey so you are designing the room around a real location rather than a hoped-for one.
Our roof was re-covered years ago under a council programme. Does that cause problems?
Not usually, but it does mean the build-up is unknown until the tiles come off. On this stock we regularly find mixed battens, replacement felt of uncertain age, or a covering heavier than the original. Any of those can change the work around the opening or the flashing kit needed. That is why we quote after a survey and hold the price, rather than giving a figure by email and revising it once the scaffold is up.
How high does the upstand need to be on a rear extension flat roof?
At least 150mm above the finished roof level, measured once the insulation and waterproofing are on, not from the bare deck. On a warm-deck build-up the kerb is formed off the structural deck and carried up through the insulation. Anything lower and water and debris wash back over the kerb on a flat roof that already sits close to level.
There is a chimney on the party wall. Does that stop a rooflight going in the back slope?
No, but it moves it. A retained party-wall stack has to be cleared with enough room to flash the rooflight properly and to keep the lead back-gutter behind the stack working. Sit a unit too close and you compromise the detailing that keeps the stack itself dry. So the stack usually sets how far along the slope the window can go, which is why we mark the position on the roof rather than agreeing it from a plan. Often it still lands where you want it, but it is worth knowing before the design is fixed.
Will you need my neighbour’s permission for the scaffold?
Only if the scaffold has to stand on their land or oversail their airspace, or if we are cutting into structure near the boundary. Then the Party Wall etc. Act 1996 applies, which means written notice and either their agreement or a surveyor to settle the detail. Most jobs on a semi here stay entirely within your own roof and your own ground and need none of it. We tell you at survey which situation yours is, so any notice period is planned in from the start.
Both halves of the semi were re-roofed together years ago. Does that make it simpler?
Sometimes, but not always, because a shared re-roofing programme did not guarantee identical work on both halves, and right-to-buy sales mean one side may have been done again since. The build-up under the covering is still only confirmed once the tiles come off. What a joint re-roof does tell us is roughly the age and type of the current covering, which helps us predict the flashing kit. We still survey your own roof and hold the price to what we find, rather than assuming your half matches the one next door.
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.