You need a structural engineer to do a report for the steel, and then there might be extra expense like rewriting, moving light fittings, new ceiling, windows etc. then building regs guy comes to check it. Once we started it grew and grew but its fantastic now. You will need a new kitchen too I assume, it is a big project but it was worth it.
We didn't think of doing it when we renovated the kitchen. Now i regret that we didn't knock them together, wish we had thought it through more! We might do this though... I would have a look at similar houses to yours on rightmove and how they have done the layout to get an idea what's feasible and how the end result could look!
We're getting ours knocked through in the next month or so (so I may need an intravenous G&T each day then). I was a bit concerned about losing a room, though we have a living room across the hall. So, we're having folding door, three full size glass 15 pane doors hinged so they fold right back against the wall. One of them is going to be a separate door so we can use it as a normal door if we want to shut the room off into two separate rooms if that makes sense. That way we can be open plan most of the time but, as DS grows up (he's six) we can have a place to dump a group of boys to watch ghe footie or play on the computer without having them cluttering up my living room :-)
And, don't forget, your house will only be what it's worth when you sell it. If that's in ten or twenty years time who knows what will be in fashion. Plus, by then, you'd have probably added something or removed something to keep up to date. If it will work for your family, now, then do it.
We knocked thru tiny tiny kitchen to the rear reception 4 years ago, love it!!! The wall taken down wasn't a supporting wall so didn't need a steel replacement. Think about kitchen placement too, you might get more units and a bigger kitchen by installing the new kitchen on the other side of the new room. Maybe a range in the chimney breast? An island is a fantastic extra storage and having a big slab of worktop is brilliant for buffets and sewing needs!!
Then we can avoid the need for a proper dining table that's only needed in our house when we have people round. The rest of the time our dining room table is totally defunct which us a shame as it takes up so much room. This way we're getting an island which I think will be utilised. Just need to find the right one in the UK!
Hi winetime, the island seating in that picture is just a breakfast bar and tall chairs or bar stools. Do you really want to have all meals perched on bar stools? It is also possible to have banquet seating coming off an island but that would be a big chunk of solid in the middle of the room.
Kitchens are really a series of boxes with worktop on top. A breakfast bar off an island has an overhang of worktop normally 30cm. To get the ball rolling book an appointment with a big high street kitchen cos and take in your room dims. It's free and can help you think how the room will be used.