What you're describing is weird. I'm sympathetic to you both - I'm a procrastinator, have always done acres of groundwork for any project but actually put the project together in an 18-hour frenzy starting the day before deadline. I am almost completely time blind. I definitely have some kind of ND, but there's no point chasing it up at my age and I managed a great career, social life, etc while younger. Had to get jobs where punctuality didn't matter, though, and have missed almost as many flights as I've caught. Plus exams, surgeries, and all those things time fiends say "I bet you wouldn't miss ..." as if it were some kind of triumphal gotcha. Yes, yes, I would and I have.
I'm also extremely sympathetic to my partners, friends and family, who've had to work around my failings with varying degrees of success and goodwill. 35 years of this must have taxed your forbearance pretty heavily!
I'm not very sympathetic to your DH's attitude. From your telling, he seems to be doing what the Army called Dumb Insolence: stubborn, passive resistance. In wartime, this was a court-martial offence. I'm not recommending the firing squad, but am baffled as to why he's not more constructive. Does he respect you - as a partner, as a person? Is he scared of you? Is he afraid of fucking up, of doing the thing imperfectly? (This is a huge mental block of mine. Childhood ishoos.)
Wrt the home improvements, the glaringly obvious solution is to follow Plan A and hire competent professionals to do what you need.
With the issue in general, I don't imagine you're too enthusiastic about living with Mr Won't full-time for a further twenty years, with old age creeping in to make things worse. I think therapy is called for: ideally for him but, if he wont go (he won't), for yourself to help create strategies that may improve your quality of life.
One last word - Do you hold to the tenet that "If you want a thing done well, you have to do it yourself"? If so, drop it now. It's a lie. Many things are just fine done badly, many others sort themselves out if you do nothing, and things can be done well by other people.
Wishing you peace 