Switching energy provider - How much should I increase my annual consumption by, due to WFH full time?

[Username1284]

For weekdays I guess we'll now be using Gas & electricity between 9am and 3:30pm when previously we wouldn't, that's 6.5 hours * 5 weekdays = 32.5 extra hours per week.
I've worked it out that I will now need it 15.5 hours per day * 7 minus 3 hours to allow for lie-in at weekends = 105.5.
I think that's an increase of 45% but in the summer months we won't have the heating on and have less lights on and in the winter the kids will be at school so we will try to minimise the amount of heat and light etc
Is an increase of 20% a reasonable guesstimate?
Has anyone else worked this out?

Anyone?

It's as good as any but I think the biggest factor is what sort of winter we have as your heating is the biggest cost and will cost more if the winter is cold.

During summer the extra cost will be minimal because it's just a bit of extra power for low use devices like laptops and maybe a few extra kettle boils, which isn't much in the great scheme of things.

I'd go with an extra 20% and you can always adjust upwards or downwards as needed as time goes on. It won't make a huge difference to who is the cheapest supplier, it matters more that you're on a deal, any deal, rather than staying with your current supplier and going up to the standard and hence more expensive rate.

Thanks @BarbaraofSeville that makes sense.