Renewing the Roof

We need to renew the roof of the community hall, (known as the Wesley Centre) where all the community activities take place.
The building is over a hundred years old and the current roof is the original.
The roof comes in 4 sections and we have been advised that 2 of the sections are the most urgent. We intend to carry out work on the remaining 2 sections at a later date when finances allow.