What might raise their rates on home and contents insurance?

Regardless of the type of insurance is, there is always a possibility that can increase your rates.  This also applies to home and safe content.  The most important thing that can raise rates is if he has had to file a claim.  In case of having to use the insurance you pay to protect your computer, can cause your rates go up.
Another thing that can raise rates significantly would make changes to your policy.  It is possible to have riders extra in policy, or may want to add additional coverage.  To do so, you will undoubtedly have higher rates of pay for each month.  You can really pay to Compare a little if you want to make changes to its policy that does not end with rates that are draining your wallet and bank account.
A thing that people do not realize is that you can be paying higher rates, just because they choose to pay the invoice on its own every month instead of automatic payments with your bank account or credit card.  If this is something that makes it, consult with your insurance agent to see if a discount you can offer to make automatic payments.
Also check with your agent to see if there are any discounts for some things that can reduce your premiums such as having an alarm in the home banking with a particular bank or even their age category.  There are a variety of discounts you may qualify what you can get a lower rate.  Just be sure to review the list of possibilities with your agent so you can be sure of that gets the best possible price.