My  roof needs replacing soon. Does it make sense to combine the installations?

Yes, it is always a good  idea to combine a roofing and solar panel installation when possible. If the roof condition is not ideal (minimum of 10 years life expectancy) and panels are installed, they may have to be removed to replace the roof, then reinstalled, leading to unneeded labour costs. A good contractor will always ask the age of the roof and give a honest assessment of the roof condition.