The short answer
Yes, a north facing skylight is worth it if you want steady, even daylight. A north slope never gets direct sun through the middle of the day, so the light is soft and constant and the room does not overheat in summer. The trade-off is less warmth and no sunbeams. Size the unit a little more generously and choose clear glass.
What a north-facing slope gives you
In the UK the sun sits in the southern half of the sky, so a roof slope facing north sees sky light but almost no direct sunshine. A north facing skylight therefore delivers daylight that is even and changes slowly through the day. It does not produce bright spots on the floor or glare on a screen.
That quality suits studies, studios, kitchens where people prepare food, and bedrooms where you want a bright morning without a heated afternoon. Those who ask about a north facing rooflight are often worried that no sun means no point. The reverse is closer to the truth: the light is gentler, and it is there for more of the day.
What you give up
A north slope collects little free warmth from the sun. In winter the room gets daylight but no direct heat from the glass, so the glass performance matters. A unit with a low U-value and a warm-edge spacer keeps the room from feeling the glass as a cold surface.
You also lose the sunny, dappled light that south and west slopes give. If a bright, sunlit feel is the aim, a north slope will not deliver it, and you should say so at the survey. If the aim is to make a dark room usable, it usually will.
How orientation changes sizing and glass
On a south or west slope, the question is often how to limit heat and glare, and the answer can be a smaller unit or solar control glass. On a north slope the question flips. There is little heat to control, so the glass can be clear and the unit can be larger, within what the rafters allow.
That does not mean choosing the biggest unit that fits. The size is set by the rafter spacing, the room and the roof covering. What orientation changes is the glass specification and how generous you can be. The table shows the usual difference.
| Slope | Main concern | Usual glass choice |
|---|---|---|
| North | Enough daylight, winter warmth | Clear glass, good U-value |
| East | Bright mornings | Clear glass, blind if wanted |
| South | Heat and glare in summer | Solar control glass, blinds |
| West | Low evening sun | Solar control glass, blinds |
Pitched roof or flat roof
A roof window on a north-facing pitch lights the room below at a steady rate, and an opening one adds ventilation. Our roof window installation service covers the fitting. The slope's angle also matters: on a steeper pitch more of the sky is visible through the glass, which helps.
On a flat roof, orientation matters less, because a flat rooflight looks straight up at the sky. A flat unit collects light from the whole dome of sky wherever the house is pointing. If your only roof is a north-facing flat or low-pitch one, a rooflight can work well. Our page on flat roof rooflight installation sets out the options.
When a lantern or a sun tunnel fits better
Where a north slope is small, shaded by a neighbouring building or has awkward rafters, a roof lantern can gather light from several sides and so partly makes up for the lack of sun. A roof lantern is suited to a flat-roofed extension, where the glass faces more than one direction.
Where the room is deep inside the house, such as a landing, hall or bathroom with no outside wall, a sun tunnel is the better fit. A sun tunnel carries daylight down a tube from a small dome, so it does not depend on a large opening. The maker's published comparison sets a 14-inch tube beside a 60W bulb in good conditions, with light falling as the tube gets longer or bends. Treat that as the manufacturer's figure, not a reading from your roof.
Things other than compass direction
A slope that faces north but has open sky above it can be brighter than a south slope hemmed in by a taller building or a mature tree. Look at what stands in front of the glass, not only at the compass. Chimney stacks, dormers and parapets all cast shade across part of a roof.
Time of use matters as well. A home office used from morning to late afternoon gets the most from steady light. A kitchen used mainly in the evening may rely on artificial light whatever the slope. Think about when the room is occupied before you pay for extra glass area.
Choosing between one large unit and two smaller ones
A wide north slope can take one large roof window or a pair side by side. Two units spread the light more evenly across a long room and are easier to carry up a ladder. One large unit gives a bigger view of sky and needs fewer flashings. The rafter spacing often decides the question before taste does.
Where the room is long and narrow, such as a loft landing or a galley kitchen, two smaller units usually light it better than one. Where the room is square, a single larger one tends to suit. Both options are priced in the written quote so you can compare.
Blinds, heat loss and the dark months
North light is at its thinnest in midwinter, when days are short and the sky is often grey. A blind that can be drawn at night helps keep the room warm, and a blackout blind helps bedrooms where early light is unwelcome. On a north slope you will rarely need a blind to shut out the sun, so the choice can be about privacy and warmth instead.
If the room is a bathroom, an opening unit also lets steam out. That helps with condensation, though it will not remove it on its own.
What the survey checks
At the survey Ridgeway Skylights notes which way the slope faces, what stands in front of it and how deep the room is. These go into the written job plan alongside the chosen unit, the permission position, the Building Control route and the fitting date.
The quote is free, and a ten-year guarantee covers our workmanship.