Repeal the size criteria for housing benefit (commonly known as the "Bedroom Tax"), which punishes housing benefit claimants for having spare rooms when in many cases smaller properties are not available for them to move into.
The fundamental shortage of the supply of housing has pushed up the cost of living to unaffordable levels, which contributes to lifetimes of debt and requires the state to spend too much supporting people just to put a roof over their heads. The main beneficiaries of the high cost of housing (whether rent or mortgage) are the banks and large companies through the effective wage subsidy of housing benefit. The only way to solve this problem in the long term is a sustained large scale increase in the housing supply, driving down the cost of putting a roof over ones head. This will also put more money in people's pockets which will benefit the rest of the economy. For this step change in supply to take place, we must accept fundamental changes to planning laws, increasing the supply and therefore reducing the cost of land that can be built on - as this cost is the biggest contributor to overall housing costs, rather than the actual building.