There is no bad month to lay a driveway. There are bad conditions.

You will find a lot of sites stating a minimum air temperature for laying tarmac. We are not going to give you one, because we cannot find a published UK source that supports a specific figure — the relevant British Standard is paywalled and the industry bodies do not publish an ambient threshold. Repeating a number because everybody else does is how bad information spreads.

What is published, and what actually matters, is the mechanism. Asphalt has to be compacted while it is still hot. The national specification for reinstatement works sets minimum rolling temperatures by material — in the region of 95°C to 110°C on arrival grades — and final rolling temperatures as low as 75°C to 85°C depending on the binder. It also notes that to achieve acceptable air voids, most materials require greater compactive effort as the temperature approaches the lower limit.

That is the whole story. Cold air, a cold base, wind and a thin layer all pull heat out of the material faster, which shortens the window in which it can be compacted properly. A crew that is organised — material arriving on time, the roller ready, the area prepared — can work in cold weather. A crew that is waiting around cannot, and the driveway that results has too many voids in it and will ravel at the edges within a few years.

So on a cold day, what you are judging is not the thermometer. It is whether the job is set up to lay and roll without a gap.

Blocks and bedding sand are not troubled by cold. The mortar in the edge restraint is, and so is any concrete haunching, and those are the parts holding the whole thing together.

Masonry mortar guidance is explicit: work should stop when the air temperature falls below 3°C, unless the mortar temperature can be maintained at a minimum of 4°C until it has hardened; work can resume when the air temperature rises to 1°C and is expected to keep rising above 3°C; never use mortar containing ice particles, and never lay mortar on frozen surfaces. New work should be covered against the weather, with insulating covers if there is any danger of it freezing.

For concrete, the figures are similar in spirit: it should not be below 5°C when delivered, the surface it goes onto should be at least 2°C, and the concrete should be held above 5°C for the first 48 hours after placing. Warranty guidance goes further and says concreting should not take place where the working temperature is below 2°C or the ground is frozen.

Mortar that freezes before it has gained strength does not recover. That is the real winter risk on a block driveway, and it is entirely manageable — you cover it, or you do not lay it that day.

If there is lawn going back alongside the hard surfaces, the seasonal advice runs the other way.

The RHS puts the best time for laying turf in mid-autumn, and says it can be laid at any point between mid-autumn and early spring, whenever the soil is not too wet or frosty. It advises against laying from mid-spring to early autumn, and notes that turf laid in early spring often needs extra watering through dry spells in its first summer.

So the season people instinctively want a new lawn in — late spring, ready for summer — is the hardest one to establish it in. Autumn is easier and cheaper, because the weather does the watering.

If you have a date offered to you and you want to sanity-check it, this takes five minutes.

Here is the honest version of the line the trade uses in October.

The reason to book in winter is not that the weather is better — it is that you will get a date, and a crew that is not trying to fit you between two other jobs. Spring and early summer are when everybody decides at once that this is the year, and lead times stretch accordingly.

Frozen ground and standing water do stop work, and honest companies lose days to both every winter. But the days that are lost are the days the ground says so — not the whole of December because of the label on the month.