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What kind of person will be qualified to tell me if I can remove a floor without making the house collapse?
A structural engineer is usually a good place to start.
If I can't or it's stupidly expensive, how can I make our bizarre sloped half concrete, half board floor flat? The boarded half comes to a ledge/step down into the hallway so some kind of self levelling stuff likely ain't gonna cut it.
So the floor slopes downhill to a step which then goes down into the hallway? I vaguely remember a drawing you did explaining this in more detail but the specifics escape me.
Self levelling could be made to work if you shutter off the top of the step however it has the potentially to be quite a thick pour and therefore require a lot of self levelling compound. You also have to remember that there is a maximum thickness you can pour in one go. While it is possible to do multiple pours to bring it up to thickness it can cause problems.
It may be worth considering getting someone to lay a cementicious screed. Good outfits are fast and will get it flat first time. However you will need to stay off it for a period of time until dry. Also you will need to consider doing something with the step to make sure any steps are not too big and if there are multiple steps they MUST be even otherwise it is considered a trip hazard.
Bobbo-
What self levelling compound do you use? All the stuff I looked at from a packet can only do about 12mm. Anything more and you need to add something to it.
I still say that try and figure out what is there from plans, as getting a structural engineer is going to be pricy as any worth his salt will want to expose to confirm what is actually there and any asbestos tests to as depending of age, they put asbestos in everything. Proof is Central Hill blocks of flats in crystal palace.
lynx
What kind of person will be qualified to tell me if I can remove a floor without making the house collapse?
If I can't or it's stupidly expensive, how can I make our bizarre sloped half concrete, half board floor flat? The boarded half comes to a ledge/step down into the hallway so some kind of self levelling stuff likely ain't gonna cut it.