Can an insurance company raise your premium?

  first please excuse the typing and word usage as I using speech to text technology. During the initial underwriting phase (many companies will issue a 30-day binder or something similar) if they find undisclosed or additional negative information which affects their rating formula, they can raise your premium and depending on what they find may even decline the policy and refund your premium.  I believe that if they raise the premium the company must also offer you the opportunity for a refund but I am not certain. Depending on the company,  this may work out well for you if you later need to make a claim under the policy. After you make a claim the first thing many substandard companies do is look for excuses not to pay. They look for any misstatements or omissions in your application and use that as an excuse to deny coverage. We see this type of denial all the time. Under florida law, a material misrepresentation made by an applicant  when applying for insurance, which if known to the company would affect their premium charge or decision to accept the coverage can be grounds to deny a claim made on the the policy. I recommend you consult your insurance agent and discuss whether the premium increase is appropriate and your other options.