Smashed iphone 5 screen how much would it cost to repair

If in the US, $149 at any Apple store. Otherwise, $269 to replace the phone. If in the UK, call an Apple store & see if they have started replaceing screens on the iPhone 5.

Repair and replacement costs depend on your iPhone model and your AppleCare coverage. Accidental damage isn’t covered under theApple One Year Limited Warranty.

Have AppleCare+?

AppleCare+ covers two incidents of accidental damage with a $79 service fee. You can also use our Express Replacement Service to get a replacement even before sending us your iPhone. You can check if you have AppleCare+ by entering your iPhone serial number.

For an out of warranty repair please contact your local service provider as in US, repair is usually $269, other wise a replacement phone from insurance will tell you how much is the deductible for a new phone

See http://www.apple.com/support/iphone/repair/screen-damage/