Dont rush to remove the ivy as it is a very important plant on which many insects, birds and bats depend. Ivy is also the last source of nectar in the autumn and without it we would probably have no wild bees. It is attractive to look at and unless your house is ancient and full of cracks, which I doubt, ivy will do no harm. We have very few native evergreen plants in Ireland and because of this ivy plays an essential role in providing food and shelter and nesting places for wildlife. Even in the heart of a city, plants such as ivy play an important role and if we nurture them we contribute to truly sustainable living. I have thick ivy on the wall outside my office door and currently there are a robin, a house sparrow and a starling nesting in it. Has to be worth retaining.