I have built 8 cottages over the last seven years, two of them this year. Just getting some of the materials, like windows and metal roofing, has been troublesome. For the first one, I had to custom order the windows, for the second, two months later, I could get them "off the shelf". I had to look around for the roofing, my preferred supplier has it on a 6 week backorder. Lumber has gone up by 500% the last 7 years. Also, with the health measures in place, everything takes longer, neighbours are afraid of non-local contractors, etc. Just lots more headaches.
But it can be done, and I will be glad when they are finished.