All buildings built before 1700 which survive in anything like their original condition are listed, as are most of those built between 1700 and 1840. The criteria become tighter with time, so that post-1945 buildings have to be exceptionally important to be listed. A building has normally to be over 30 years old to be eligible for listing.
In England and Wales, listed buildings are classified in three grades:
Grade I buildings are of exceptional interest, sometimes considered to be internationally important. Just 2.5% of listed buildings are Grade I.
Grade II* buildings are particularly important buildings of more than special interest. 5.5% of listed buildings are Grade II*.
Grade II buildings are nationally important and of special interest. 92% of all listed buildings are in this class and it is the most likely grade of listing for a private residential building.
There are about 500,000 buildings listed in the UK.
It is not every older building that has listed status. It depends on whether their features are rare or they are an example of particular technique or the work of an particular architect.
There are an enormous number of homes from the Victorian period and the majority are not at all unique. So owning a home 150 years old is quite common. The local government keeps a list of the listed buildings and it is actually a criminal offense to damage one. It all comes from the extensive bombing suffered by the UK in WW2 and an anxiety about losing the architectural heritage of the country during the rebuilding in the post war period. Too much was lost to property developers who were very quick to pull buildings to make a fast profit.
Older buildings have many attractive features compared to modern developments. I look around my area of London and the new builds all tiny apartments for people who don’t mind living something the size of shoe box next to a rail station for a few years at the start of the career. The big old Victorian houses, converted into apartments, provide a lot more living space and often a garden. Some are very pretty, unlike the utilitarian modern development that can be quite soul-less. However, the houses often predate electricity and had lots of fireplaces. Adapting them to modern standards by renovating was sometime done very badly with poor heat and sound insulation. Home renovation is a national past-time and when you buy a property, you gradually become aware of all the challenges. Major modifications have to satisfy the building code.
There is a massive price tag associated with upgrading the housing stock in the UK, however it is paid for. Successive governments have dodged the issue or come with ill-conceived schemes such as the Green Deal introduced, then abandoned ten years ago.
I see no government plan to insulate homes and replace gas heating with heat pumps. What we do have is lots of smart meters. The cost of which was added to electricity and gas bills. Many in the UK are sit at home looking at the bills racking up on the little energy meter displays they give you, wondering how they are going to afford to pay.
There has been some financial help from the government, but that is dues to end in April unless you are on some kind of welfare benefit. The welfare system is linked to the tax system here and there are many who receive tax credits because the pay is low. Inevitably there will be people who fall through the net and this is a big worry, especially for elderly pensioners.
When there is a crisis like this it is good measure of how effective your government is. The current shower of politicians we have in power at the moment are deeply unimpressive. About the only worthwhile thing they have done is invest in huge wind farms off the coast in the North Sea. When the wind does blow, as it does today, it replaces a lot of the gas normally burnt in power stations. 44% Wind and 8% Gas and 15% Nuclear and rest imported from interconnectors to other grids, especially France with its surplus nuclear power. On a cold, windless day, the Gas often goes up to 40% and wind down to a few percent.
https://gridwatch.templar.co.uk/
This energy crisis has been quite a shock to the system, but it is can all be managed. Long term it will kick into a higher gear the migration to renewables and we might even get insulated houses and reduce consumption.
It is an ill wind that blows no good!