Sun tunnel installation in Liverpool

The trade says sun tunnel, sun pipe or tubular rooflight. Homeowners search for tubular skylights in Liverpool, or just ask for a light pipe, and every one of those names points at the same product. What matters more than the name is the category it sits in. A sun tunnel does a different job from a rooflight or a roof window, and it suits a different set of rooms.

The assumption we are asked about most is that a rooflight is always better because it is bigger. In a room directly below a roof slope, it often is, and our roof window installation service handles that case. But where there is a loft full of timber, a run of ceiling joists and a boxed-in pipe between the roof and the room, the straight line a rooflight needs does not exist. A tube can take a bend where a frame cannot. If you are weighing the two, the guide on sun tunnel or rooflight for a dark room sets out the choice room by room.

Nothing in the system needs power, a switch or a battery. Choosing the route and sealing the dome into the roof covering is the real work, so each job begins with a survey.

It helps to picture the scale. The dome that shows on the roof is a small clear bubble, the opening in the ceiling is a single round cut, and between them is a pipe you could carry under one arm. Compare that with a pitched-roof window, where a rafter may be cut and a whole slope opened up, and it is easy to see why a tube is often the lighter job for a lived-in house.

Two kinds of tube are on the market. Rigid tube comes in straight lengths of polished metal and carries light further per metre. Flexible tube is ribbed and can be bent round obstacles, which gets it through awkward lofts, but it loses more light because the ribs scatter some of what they carry. Many jobs mix the two: rigid where the run is straight and flexible for the one awkward stretch. The guide to sun tunnel routes, lengths and bends goes through how each choice changes the light in the room.

Then there is the matter of the tube itself. Warm, damp air from a bathroom meeting a cold tube in a cold loft is a recipe for condensation. We keep the tube joints taped and sealed, and where the run crosses cold loft space we sleeve it against the chill. The ceiling end needs sealing too, so that the diffuser does not become a path for warm air into the loft.

Loft insulation lies deep across most ceilings and has to be lifted, then replaced neatly round the tube. A mineral wool quilt keeps its thermal value only if it is not squashed or left with gaps beside the new penetration, so we put it back by hand rather than stuffing it in.

The diffuser at the bottom shapes the mood of the room. Some are plain frosted discs and some are patterned to throw the light wider, and a hallway wants a different spread from a bathroom. We show the options at survey and set the ceiling hole to suit the one you choose, so there is no gap round the rim for the plaster to crack along.

We bring a torch, a long tape and a plumb line, and we do all the proving on the day of the survey. If the path is clear, the written price follows. If it is not, we say which room could take a tube more easily.

A well-placed sun tunnel makes a dark room usable. A landing that needed the light switched on every time you crossed it starts to read as a daylit space, and the difference is plain when you step in from a lit room. What it does not do is turn a cave into a conservatory. The amount of light depends on four things: how wide the tube is, how long and how straight the run is, how clear the sky is, and what sits above the dome.

Tube diameter is the first lever. A wider tube carries more light, but needs a bigger opening in the roof and a bigger hole in the ceiling. Where the run is long or has a bend, a wider tube can make up some of the loss, which is why we often suggest the larger size for an awkward route and the smaller one for a short straight one. What each choice does to the quote is covered, without invented figures, in how much a sun tunnel costs to install.

Orientation comes up in nearly every enquiry. A tubular skylight works from the whole sky as well as from direct sun, so a north-facing slope is not the dead end people fear. A clear dome gathers diffuse daylight from overhead, and on a grey Merseyside day that is most of what there is. A north roof gives a gentler light than a south roof, and winter gives less than summer, which is true of every window. The answer on north-facing roofs goes into what to expect season by season.

Shade is the thing to watch. A tall chimney stack, a neighbour's gable or a mature tree on the south side can take real light out of a dome. We look at the roof from the garden or the next street along, and we move the dome a metre or two if a clearer patch exists.

It is worth being plain about the other limits too. A sun tunnel offers no view, because the diffuser is frosted or patterned and the light comes through it as a glow. It offers no ventilation, because nothing opens. A bathroom that needs air movement still needs its extractor fan, and a landing that gets stuffy in summer still needs a window somewhere. Where the room needs air as well as light, a rooflight that opens, or the units on our electric opening rooflights page, may serve better.

Because the light arrives only while there is daylight outside, the room still needs its ordinary fittings. Think of the tube as taking the edge off the switch rather than removing it. People tell us the saving they notice most is simply no longer reaching for it every time they cross the landing, and that is a modest, honest gain.

Daylight in a room with no window is worth having, as long as nobody expects a view or fresh air from it.

Sun tunnels from earlier decades turn up in Liverpool lofts more often than people expect. The usual signs are a dome that has gone yellow or crazed, a stained ceiling disc, a tube that has come apart at a joint, or water marks round the ceiling. We replace the dome, the flashing, the tube and the diffuser as needed, and we look at the roof opening and the framing before choosing between a swap of the parts and a whole new unit. Sometimes a modern kit fits the old opening without any change to the roof. Sometimes the old base is the wrong shape for the covering, and a new opening is the better answer.

When a sun tunnel replaces an older unit, the same survey rules apply. We trace the route again, because the loft may have changed since the first one went in: boarding, a new tank, an extension to the wiring, or a second hatch. Any of those can take light from the old line. The roof covering may have changed too, particularly where a tiled semi was recovered in a different tile, and the flashing must match what is there now.

A replacement is quoted and guaranteed on the same terms as a new tunnel. A survey comes first, and you receive a written price afterwards, with no price given before we have looked at your roof. Our written guarantee on the workmanship lasts 10 years, and the guarantee terms explain how it works. If you are weighing the budget, the costs page explains what drives a quote.

It also helps to see where tubular skylights sit alongside the rest of what we do. A dark room directly under a slope often suits a roof window better. A slate roof in a conservation area may call for a conservation rooflight. A sun tunnel earns its place when the room has a loft above it and no straight view of the sky, and that describes more Liverpool landings and hallways than you might think.

To get started, ring us or WhatsApp a photo of the dark room and of the roof above it. We will tell you which product suits the space, and we will book the survey. Get a free quote