First Choice Builders

Hi we've just bought a property in the Urb, and found out the house main amp/electricity is 3.3, and apparently, lots of properties get this 'increased' to a 5 amp, so they can switch on a few electrical appliances at once !. At the moment, our electricity is tripping, if we have the air con on, plus the kettle . Is it a big job ?? how long does it take to increase the amp ? also, approx idea of the cost please ? email: [email protected] Has anybody else had this problem - grateful for any info,and a phone number of an electrician - thanks !