My partially complete addition to the thread:
One of the first things we knew we were going to do when we bought this house was to build a garden office for me (the cottage has 2.5 bedrooms and two people wanting permanent offices).
That was going to happen in March, but then, well, we know what happened - I made the call to press pause whilst I figured out where business was going only moments before the office company were going to ring me to say they were going to pause whilst they figured out how and whether they could do business in lockdown.
By June, I pressed go again and was near the top of the list. Sadly, the amazing spring led to a very wet summer and the team had less fun than they might have done so.
All finished in late July.
Joinery was due in October, but COVID and a new CNC machine has slowed them down; I had hoped it was done by Christmas - but we're now at mid-January which is a pain, but I'll live with it.
Office is superb so far though - not huge (but big enough for me!), has a storage shed at the end accessible from another door.
Seems to retain heat well (there's a lot of insulation in there), underfloor heating seems to perform well too.
Armoured cat6 down to the house, so getting the full benefits of our FTTP connection.
As befitting the office of someone who writes building management software, it has some cool tech; full Lutron lighting system, Crestron touchscreen in the wall with access to cameras, music (in the office and the speakers mounted on the office for the garden terrace).
So looking forward to getting it done - COVID slowed it down dramatically obviously, but it really then enables us to do a load of work on the house as my old office becomes my wife's new office and we get a proper guest bedroom.
Very glad I agreed on the garden office before COVID though - the company who built it now have a very, very long leadtime as their business has gone through the roof.