Shipping cost, Base + /kg

-- HikaShop version -- : 2.3.1
-- Joomla version -- : 3.3.1

I need to calculate my shipping the following way.
Base price of xxx for first 10Kg then add yyy per Kg over 10Kg then add a 30% surcharge to this total.
The yyy value varies depending on warehouse location and shipping destination zone (Depot location).
There is also a surcharge for door-to-door to addresses outside depot location.

Would it be easier to just code a custom plug-in in PHP? If so are there any templates to assist me in creating a hikashop shipping plugin.

One option I have thought of is to ad a request shipping option, then manually calculate shipping cost before sending an invoice to the customer.

Hi,

Yes it seems to be indicated to create a custom plugin in your case.
You can look at the plugin "custom_quantity_weight" which already allow to edit the price depending on the weight.