Early on (51 years ago) I was informed that I had 3 strategies for dealing with exercise.
1) eat more to cover the drop in blood glucose with exercise
2) reduce my insulin dose for the time during and for at least 6 hours + after exercise
3) a mixture of 1) and 2)
Later I learned more about the whys and wherefores. And that having lots to eat to keep BSLS up (= option 1) was fine in one sense but I tended to put on weight. And if the exercise was very vigorous the adrenaline involved would spike my blood sugar early on but my muscles would use up their stored sugar and 6 + hours later would replenish that store by drawing up glucose from my blood causing the hypos. Eating at 2 am might be great in some ways but ...
So .... I would reduce my insulin dose(s) for the insulin(s) working at and following the work (= option 2)). usually 20 % or more depending on length and intensity of exercise. For each day of a canoe trip I would look at the may, try to guess the exercise involved and allow for the fall in BSL that evening. I could always slide to option 3) if needed.
Now using an insulin pump I can program a 20 to 30 % reduction in basal insulin for the 4 to 6 hours etc.
If the work could not be done due to bad weather etc then I would add in a correction dose and top up the basal dose etc And , um if I had used option 1) regurgitating extra food eaten was a decidedly less popular way to deal with things!!!
With THREE EXCEPTIONS:
1) if my BSL was 13 mol/l or higher I would hold up exercising because at that and higher BSL the liver starts putting more glucose into the blood stream . Why ? not sure but probably some feedback that at those BSLs the body cells are starving. Exercising at such BSLs made me feel sick, BSLS just went higher. So.. for such bsls I would take a correction dose of short-acting insulin, wait until BSL was below 11 mmol/l and then make adjustments to basal insulin dose etc
2) if I was unwell with a cold, viral infection I figured exercise was not a good idea and usually my insulin doses had had to be raised to deal with the stress of illness anyway.
3) if my bsls was unstable, particularly hypos occurring I would be more vigilant with exercise/work or avoid it and in particular avoid heights, use of electrical machinery, use of sharp instruments etc
4) there is always another exception like being distracted away from starting work to watch a good movie, the football etc the excitement of these would often send my BSLs up and so more insulin was needed !!
Best Wishes with your work/renovation (or reno, as we say in Oz).