Can Skylights Be Fitted in Winter?

Winter is workable

There is no season in which a skylight cannot be fitted. What changes is how many days are suitable for working on a roof, and how careful the team has to be about what is done on each of them. A fit in January can go as well as one in June, as long as nobody forces a job through weather that does not allow it.

What stops work on the roof

These are safety calls, and they are made on the day. If the forecast looks wrong we would rather move the start than begin and leave a half-finished roof.

Short days and cold mornings

In the depths of winter it is dark soon after mid-afternoon in York, so the working day on the roof is shorter. That does not change how the job is done, but it does mean the roof has to be sealed up earlier, and a job that would take two days in summer may leave less margin. We plan around the light.

Materials and cold

Some products care about temperature. Sealants and adhesives have a working range printed on the pack, and flat roof membranes that are bonded rather than mechanically fixed need a dry, reasonably mild surface. Wet plaster inside dries more slowly in a cold house. None of these is a reason to wait for spring, but the order of work and the choice of product can be adjusted to suit.

What cold weather does to each part of the job

Roof covering	Cold-brittle slates and tiles need gentler handling
Flat roof membrane	Needs a dry surface, so it may be moved to a better day
Sealants	Chosen to suit the temperature range on the day
Inside plaster	Slower to dry in an unheated room

Is the house safe overnight?

The question most people ask about a winter fit is really about the night. Each evening the opening is covered and sealed before anyone leaves, so frost, rain and wind overnight meet a secured roof, not a gap. A job that runs across several days is left in a sound state every night, weekends included.

Keeping the house warm

For the hours the roof is open, the room below will lose some heat, so heating the rest of the house is worth planning for. The screened work area keeps the cold from spreading, and where practical the opening is sized so it can be closed in the same working day. If a room is used as a bedroom, you may prefer to sleep elsewhere on the night of the fit, and we can tell you whether that is likely to be needed.

Why winter can suit you

A winter fit has some small advantages. A new rooflight is usually in before the long dark evenings, and the gloom of a landing or kitchen is the thing you notice most at that time of year. The glazing you choose also matters when the weather is cold, and the page on how long skylights last says what a good unit should do over the years.

What if the weather turns mid-job

Forecasts are not perfect, and a bright morning can turn. If conditions worsen once the roof is open, the opening is closed up first and the rest of the work waits. That may stretch a job by a day or two, and the plan we give you says what happens in that case. Nothing is rushed to hit a date, because a hurried roof is the sort of fault that shows up in the first heavy rain of the following year.

It also helps to be flexible about the start. If you can move your fit by a few days when a spell of settled weather appears, the work often runs more smoothly, and we will tell you if a window looks likely.

Condensation and a cold house

A new rooflight in winter shows a house at its most honest. Warm, damp air from cooking and showers meets cold surfaces, and a badly chosen or badly sealed window will mist or run with water. A modern roof window with a warm-edge spacer and a properly sealed vapour control layer around the lining keeps the inner surface warmer, which cuts condensation. It will not cure a room that is simply very humid, so extraction in a bathroom or kitchen still matters.

The cold season is also when you will first notice a draught or a cold spot. Report it early, since a small adjustment to a seal or a hinge is easy while the job is fresh.

Planning your fit

If you are weighing up timing, the answer on how long it takes to fit a skylight will help, and the Prestige Skylights York home page sets out how the whole service runs. When we survey the house, which is free, we look over the roof, talk through the time of year, and give you a written quote and a plan for each day of the fit, with a note on what we will do if the weather turns.