How many walls can I take out here?

[GrandPrismatic]

Hello! Per attached I’m looking to take out the inverted L shape wall between kitchen and dining room (I suspect supporting wall) and I’d also like to push out the whole ground floor back wall by a couple of meters to make an open plan kitchen diner roughly 8m by 6.5m. Back porch and garage to be demolished, kitchen and dining spaces to be flipped and a new utility to be build at the back of the current garage.
I’d like the extension to be “seamless” ie not have big supporting pillars blocking the space or part walls remaining. I suspect will require a shit ton of steel reinforcement. Any thoughts on whether that would even be possible?
Also 8x6.5 meters...is this big enough for kitchen diner and sofa/lounge space and still feel big and airy? Anyone have any comparisons?
V early days in remodelling plans...haven’t engaged with an architect so still at the dreaming is possibilities stage!

Anything is possible- but what you need is an architect and structural engineer.
You can't just take out walls- as you have said you will need steels to hold up the rest of the house. These will have to sit on substantial supports.

For example- in a terraced house DH worked on, the wall between the central dining room and rear kitchen was removed. A box shaped steel frame had to put it- across the floor and ceiling joins to uprights at the sides- to hold the upstairs up and also to stop the side walls spreading sideways. This was time consuming, expensive and very disruptive.
Another house: the entire back wall removed into an extension, the back wall of which was mostly bi-fold doors. The steels were enormous and needed substantial brick pillars to sit on. The size of these plus the foundations the required (at least a meter depth of concrete iirc) were designed by the structural engineer.

Basically- possible but factor in lots of time, expense, mess and expert advice.

Without knowing what's going on structurally it's hard to say
Most things are possible with enough money, depends if it's cost effective and whether there's enough headroom - you need to get some professionals in to have a look and tell you.
I'm an architect and have removed quite a few walls over the years some dead straightforward (not loadbearing), others required some serious engineering input and you really can't tell just from a plan.
Some only became apparent when we opened them up (who knew that in the past someone thought it was a great idea to prop the massive loadbearing beam up on a bit of old scaffold and plaster it in 😳)

You will need to support the upstairs walls somehow so the extension may need to have some nibs either side to support the beam so depends what you mean by seamless
Don't get to obsessed with size. Light and airy can often be achieved with less space than clients think. I tend to reign in some extensions as clients get obsessed with going big when they can achieve what they want with less. Smaller also helps with the structure especially if you want it to be seamless.

@wonkylegs

You will need to support the upstairs walls somehow so the extension may need to have some nibs either side to support the beam so depends what you mean by seamless Don't get to obsessed with size. Light and airy can often be achieved with less space than clients think. I tend to reign in some extensions as clients get obsessed with going big when they can achieve what they want with less. Smaller also helps with the structure especially if you want it to be seamless.

That's a very interesting point about size. We've looked at a lot of houses recently where I think they've gone too big with the kitchen diner family room extension - the result has been a huge white box the size of a small a village hall in some cases. That can be what you need for a few years, but long term I can see people putting walls back in, in some instances!

Thanks everyone for your comments. @LittleOverwhelmed I’ve attached the upstairs plan so above it is a bathroom and two bedrooms so i suspect will be load bearing (but yes I need to get an architect and structural engineer before I do anything).

Good point @wonkylegs and @muckypaws re the size. I’m finding it really hard to imagine the space to be honest and would like to have three distinct sections of kitchen area dining area and lounging area but can’t decide whether 8 meters is long enough for that. I fear it isn’t which is why I thought out going out a couple of meters to the back might make more room to play around with layout. Without an extension it would be 8 by 4. Then I start doubting and wondering if I’d just be better off keeping them separate . The flow of the house works fine for us just now, especially with the adjoining doors to the living room, but I’d love to have the social aspect of the kitchen diner and we have a south facing garden so would love to make more of the light which we are not currently getting the benefit of.

@averylongtimeago thanks for the insight re reinforcement...I’m bracing myself for the worst cost-wise!

I’ll need to get myself on Instagram I think! Don’t currently have an account but sounds like worth signing up

Thanks all!

Oh here is the upstairs..forgot to attach!

Pinterest is also a good source of different ways of doing things, before and after photos etc.