Adding two windows to a van and insurance.?

[cammer]

hi - i have 3 huskies & they're wrecking our cars.

i'm thinking about buying a citroen dispatch van (the estate is too expensive) & i need 3 front seats hence the reason for my choice.

i was going to install 2 small fixed side windows, for them to look out ^v^ but am worried about insurance as it would be classed as a significant(?) mod.

the insurance is closed over the w/end but would appreciate any input meantime.
btw i live in the UK.

cheers