The importance of cutting spare keys cannot be underestimated.
While it may seem like a security risk to have a lot of sets of keys, it is always better to have a set with a few neighbours and friends, or a set hidden somewhere outside your property than to have to go to the expense and trouble if getting out an emergency locksmith should the worst happen and you find yourself locked out of your home.
Key cutting is cheap, and there are many places that can provide this service. It is often the case that the more keys you get cut, the cheaper it works out per key.
It is not only wise to get spare keys cut for your house, but also for your car and any other vehicles that you may have. It is very easy to lock your keys in the car. Many modern cars are operated by remote central locking alone, and if this fails it is important to have a spare set available.
It is also useful to get spare keys cut for your garage and shed, as while it is likely to be less of a disaster if you can’t get into these, it can be very irritating and costly.