Insurance policies are other for 12 months. Why?

just wondering why adjectives insurance policies seem to be for 12 months. Is in that any reason why insurance companies don't own eg 18 month policies. Or why not just rolling monthly policies? Are nearby any rules governing length of a general insurance policy?
They are not.

It is possible to have a policy for a shorter length.
depends what you are insuring and the risk
insurance companies enjoy to file beside the state how they plan to sell insurance. Home is roughly 12 months and autos 6 months. The underline cause is the cost of underwriting and opportunity to transformation policies. If there is a life-size hail storm that comes through an nouns or other major loss to a company they will stipulation to change rates to become more financial fit. Also auto are continually coming out near new models, designs and the this allows the insurance company to engender adjustments to pricing more frequently if they feel they dont have it right. This allow the insurance company to stay higher than there spectator sport. Hope that helps. Good Luck Would you really WANT rolling monthly policies? A brand new set of paperwork every month and the likelihood of difficult premiums due to the extra processing needed to be done by the insurers.

Of course, most insurers will allow you to cancel your policy mid-term anyway when it comes to cars and houses, so you're on the odd occasion going to be bound to them, though you may find extra charges for doing so.

Answers:   There’s no rule defining how long a policy can be. It depends on the risk individual insured as to what is an appropriate period of cover. Commercial construction policies can be within place for years (i.e. how ever long it takes them to build the thing) whilst other policies such as public liability for a big concert might individual be effective for a few hours.

When it comes to domestic policies especially property there are relatively a few factors that come into play for picking a year as a standard occupancy these include (not limited to);

Annual Risk Cycles:
Most risk cycles are annual, weather cycles are annual, one flood length, one hurricane season etc. So policies are repriced every year in insubstantial of the previous year’s experience. Long term policies are scandalously difficult to price as the longer the term, the greater the vacillation so insurers would have to charge top whack to cover themselves….not polite for the consumer. Also some months are far worse for weather than others… UK tended to be October & March…. Florida (from memory) it’s September. If insurers be to sell month by month cover they’d enjoy to charge 10 times as much for some months as for others. again…. not really what most consumers want. They want to pay one and the same amount every month, an annual policy allows this.

Averaging out risk.
A month just wouldn’t be satisfactory to average out good v bleak, e.g. whilst sh*t happens, it doesn’t develop every month…. so the insurer gets your (and everyone else’s) premium within the 11 good months as partial compensate for the claims it pays in 1 bleak one. Short terms risk would probably attract a superior premium than the same risk spread over a believable term

And lastly
It’s convenient….. most ancestors (and companies) think, plan and budget within years.


EDIT.
Re previous answer ...the FSA had nil to do with it...the FSA is smaller number than 20 years old for pete's sake. Annual policies move about back donkey's years.
Anyway I've never see an FSA restriction on policy term and I've spent adequate time reading the damn regs... it would be unworkable.. nope sorry , untill I see the Prudential reference for that I'm going to speak that it's just plain wrong !
Some are for 10 months, but 12 months was originally down to FSA (Financial Services Authority) who regulate adjectives insurance companies say no customer can be bound to one company for more than 12 months!