Large Conifers

theoretica

Can you identify the species?  Are they visible on historic streetview?  Knowing how fast they grow and their expected maximum size would help inform your action.  I would be much more inclined to keep something slow growing...

[Deleted User]

Exactly what i was just going to type out.
They may well be eligible to reduce all over but unless we know what species this is it's difficult to say.
It doesn't look like Leylandii, wrong shape, so you may be able to save them.

RAS

One thing that a friend did to take the coniferous trees (multiple ringing the garden) down to a little over 2 metres, then remove all the side branches. A stout rope was slung between the naked trunks, climbers planted and within a year the rope was festooned with clematis and some swift annuals, with roses etc providing cover for the trunks and year or so later even more foliage and flowers providing a sort of pergola.

Would give you some high level interest, avoid the cost of stump clearance and provide a little more privacy? The trunks didn't re-sprout and were still standing a decade later.