But I don't think it is a left/right issue. In certain regions it may be the left, in others the right, but generally it is subset of both that have investment in artificial scarcity. It's just the justifications that change depending on ideology.
- More environmental regulations that can be used by NIMBY.
- Attempts to solve the using various forms of rent control, which make it worse.
- Related: conservatives favor less regulation, which leads to more construction.
- Liberals hate for (or at least distrust of) landlords. Some of this is well-deserved but I've seen liberals oppose good policies because it will "help landlords".
Lastly, home owners--including liberals--like to see the value of their property go up and tend to favor policies that make it so. It would be nice if we could get people to stop looking at their homes as financial investments.
At some point you have to look at the actual results of policy.
In my experience the bulders and tradesmen who are more right-wing have more to gain from allowing more and faster construction and are more interested in removing laws and restrictions.
A lot of this comes from the attitude in the 60s and 70s where the liberal strategy was to sue the government to stop them from destroying the environment. People from that era saw the smog and the flammable rivers and are generally against development , even though today’s development processes are starkly different from back then.
The answer is always the same tho: make it easy to build housing, and build more housing. Keep building housing until there's a glut of supply.