How to level the floor in a room with sloping Victorian floorboards

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Harry_W

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We are looking to board out and carpet a small bedroom but need to make the floor level as the existing floorboards are sloping quite significantly. What's the best way of doing this?
 
Lift the floorboards, and sister new joist alongside the exiting ones. What's the height difference.
 
Are there any large gaps between the floor boards and the skirting boards?

Could be an indication of wood rot in the joist ends embedded in the external wall?
 
Thanks for the replies. I think the movement is due to a structural wall between the rooms below being removed or Nazi bombs during WW2. As the floorboards run under one of the walls it will be too big a job to lift floorboards and add sister joists. I'm thinking of just getting lengths of 2 x 2 cut to make the decline and then reboarding with quarter inch plywood.
 
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6mm plywood is OK if you are levelling up slightly uneven floor boards and will take-out differences of 2 to 4mm between boards before laying carpets, but nothing more. If the floor slopes then you'll either need to lift and sister as a previous poster recommended or add tapers to the top and overboard with something capable of taking the weight of humans, furniture, etc such as 18mm hardwood plywood (on 400mm centres)
 
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