Leave blue fir trees next to the house?

Are you sure they are firs? They are also not shallow-rooted but deep-rooted with a meter-deep taproot, which is why you can't replant them after buying them in a pot, unless they are really very small firs grown in a pot. Spruces are shallow-rooted and also needle a lot, as they become bare at the lower part of the trunk, at least mine do. I find firs beautiful, I just planted a few again, spruces well, I have them too, but they don't look as good from below anymore.

One in a single planting and that's fine. They look worse and worse year by year - I would pull them out as early as possible and plant replacements.

Cutting them down would not be a problem for me in advance. The wood generated would then be available right away for the fireplace.

The wood is also not the best quality wood - but well dried it can certainly be used in between :)

The wood is also not the highest quality wood - but well dried it can certainly be used occasionally :)

Then the stove must not be sensitive, because the resin can become a problem. Specifically for the filter. I would cut them all down. If they really are firs, nothing grows underneath anymore and the ground is unusable for the first few years. It becomes overly acidic. Not even a weed grows there.

An alternative would be to cut down a tree every year. Use the top as a Christmas tree and the remaining branches as cover twigs, and burn the wood nicely and cozy in the fire basket/bowl after drying.

And I personally find the argument about storms absolutely stupid.

While I agree with you that the weather is not getting better, is it really getting worse? Or is it just the reporting? The trees have also withstood century storms etc. in the last 30 years...

In case of doubt, it remains a matter of appearance and personal perception. The ecological value of a conifer... better than nothing, but the deciduous tree is clearly more ecological, unless it is purely about protection against massive soil erosion. [Wissen aus Schulzeit]

All fir trees must be removed now before the new building. The excavator for the earthworks will remove the stumps and root system for you. Once your house is standing, the disposal of such a fir/spruce tree will be complicated and significantly more expensive. You will ruin your entire garden with that.

One more thing. The trees contribute to your gutters constantly clogging and also promote algae growth on the house wall. I've been through all that myself and it was just an Atlas cedar.