I’m buying a flat so the management company will take care of any repairs
In some ways this is true, but in most cases the management company is made up of the individual flat owners. In the majority of cases, flat owners each pay an amount of money to the management company to cover items such as insurance, maintenance and repairs. Sometimes additional payments need to be made if there are insufficient funds to cover outgoings such as unexpected repairs.
In cases whee there is no management company, such as with a two storey terraced house which has been converted to two flats, there may not be a management company. However, in most cases the leases for the individual flats will set out liability for repairs to the building as a whole. If there are two similar sized flats then it is likely that the cost of any repairs will be shared equally, but the precise terms would need to be checked.
In a nutshell, in most cases the flat owners are responsible either directly or indirectly, via a management company, for repairs to the building.
I’m buying a ground floor flat so it doesn’t matter what condition the roof is in
If you are buying a leasehold flat then you will need check the lease clauses. A typical lease will clearly set out a leaseholder’s obligations to repairs and maintenance and will state what proportion of the repairs each leaseholder is responsible for. Many leasehold flats have a management company which will deal with certain repairs, which often includes external repairs. It is possible that each flat owner has to contribute to any works to the roof.
If you are having a survey then it’s a good idea to arrange for the surveyor to have access to any roof spaces (possibly via another flats/s or communal areas) to check for any defects. See instructing a surveyor. Also, you should enquire with the management company to find out whether they are aware of any defects and whether any repairs are programmed in the near future or medium term.
I’m buying an upper flat so I won’t be affected by flooding
While upper flats are less vulnerable to flooding than ground floor flats and basement/garden flats, you should check the terms of the lease so that you are aware of your liability to any repairs to other flats in the block, including ground floor flats and basement/garden flats.
If parts of the building have flooded previously, then the insurance premium may have increased, or there may be a higher excess in the event of flooding. In some cases flooding may be excluded from the insurance cover. It is likely that you will contribute to the insurance premium either directly or indirectly through the management company and if this is the case then yes, you may be affected by a risk of flooding.