It looks like our photo didn't post?

What is your budget? Do you own the unit next door?

I suspect that this is a much larger project & investment than you think it might be. Basically infeasible, IMO.

Seems like a lot of effort and expense for a very small increase in living space, honestly. Could you do something with this space to make it cozier/more useful or extend your use of it into more of the year without actually trying to make it into an indoor space?

Hey - thanks all. Just to respond to a couple of things - no I don't own the property next door. This project would be part of a much larger home renovation with a significant budget. I'm not thinking of this a small project.

So a 300K budget? You should be using an architect.

What does the owner next door think of your plans to kick out a supporting wall on the front of the house that you co-own? About significantly altering the facade of the property? What do you plan to do about the brick porch supports? How does the owner feel about a long drawn out construction project under your mutual roof? How much liability insurance do you plan to purchase?

I can't imagine how gaining this small amount of living space--well, actually just passage space, is going to be worth the amount of investment it will require to accomplish. And that is without considering what the condition/ value of the other half of the duplex is?

Of course it can be done, but what is the return on investment. It looks like the porch is about 10' wide and 7' long. By the time you add walls, insulation, hvac, flooring, windows, electrical and everything else needed, your space will be reduced. Are you ok with that?

What are you missing inside your home? Has anyone in the neighborhood done this?

I wouldnt do it, and probably wouldnt buy a house if that were done. I like the looks of your front porch, and would rather have a chair or two to sit and have a cup of coffee etc, when weather permits. You wont gain enough space out of that to make a huge difference in the interior anyway. I also wouldnt like it, if I was your neighbor, since it will definitely take away from the front of the house and curb appeal.

Thanks for you comments all.

My inquiry is really focused on the steps needed to get it done (even though we will use an architect). Just trying to get an early sense.

If you had to guess, do you think HVAC is needed for this space? The nearest vent is already right at the front door of the house. Can I get away without one (without affecting heat too much)?

so it sounds like what you want would require complete demo of the porch and putting on a tiny tiny addition from the ground up. For that cost, if you need more space, have you looked into creating an addition elsewhere on the house where it could be larger and you would get much more bang for your buck? I just did a c. 300 sf addition for >100k. Have you considered just creating an enclosed porch, still separate from the house? It could serve as a mudroom/foyer and small sitting area.
You could explore a mini split option instead of linking into existing hvac.

If you had to guess, do you think HVAC is needed for this space?

Yes! We don't know the dimensions of right inside the home and of this porch - so Yes!

If you had to guess, do you think HVAC is needed for this space?

Yes.

Canada

Small space with exterior walls on 3 sides w/

an unknown amount of new glazing and

One exterior door

Unknown exposure (windward side?)

No second floor above to help keep the bottom floor warmer

No heated basement space beneath