Over the last year we have tried to increase the space and storage in our house. We gathered it would be much cheaper than moving home and we were happy here but it was getting very cluttered.
Things that have worked so far:
Ottoman bed - lots of storage under the bed, easy to access.
TV placed on wall, which meant that we could move the furniture around in our living room without the tv getting in the way.
Laptop instead of PC, no bulky desk needed.
In our bay window we had a window seat with storage built in, the space was so awkward, it did not really fit a sofa and everything just looked wrong there. The window seat has worked wonders - we can keep a lot of DD's toys under there and it provides extra seating.
Shelves in alcoves built in - great for toys and books.
Blinds and light coloured unfussy curtains - have just put these in and although the amount of space has not physically changed it has made a
massive difference to the amount of light in the rooms - making them seem bigger and lighter.
Compact folding dining table -seats 4 comfortably but can seat 6 when unfolded. Saves space.
We have not had it yet, but we have just bought DD her first bed which is a shorty bed (175cm) with sliding storage underneath. It'll fit in her tiny boxroom bedroom perfectly and last her until she's a teen at least. We also intend to place folding doors which open out into the landing for her bedroom to save on space.
I think that is all that we have changed - but we intend to do much more.
I want to install kitchen units which reach up to the ceiling to increase kitchen storage.
I also want to install wooden floring throughout the ground floor to bring in a more uniform/ connected look.
I also want to paint the rooms in a light colour and in similar tones, to bring the house 'together'.
Also want to place more storage in the garden and create more living space out there.
Hope that helps a little and I have not gone off tangent to what you wanted. I'd be interested in what others have done to increase the amount of space in their homes too, so thanks for starting the thread.