Material cost can be the smallest part
One replacement slate costs little. Reaching a chimney on a tall terrace or a valley above a conservatory can require scaffold or other access.
A quote should describe the fault
A price for 'roof repair' tells you very little. A useful quote identifies the area, the proposed work and the access method.
Hidden damage
Coverings sometimes need lifting before battens, underlay or decking can be seen. Ask how extra work would be discussed if something unexpected appears.
Compare scope rather than totals
One contractor may price a proper lead section while another plans a sealant patch. Ask each what defect they believe is causing the problem and what their price actually includes.
If you are ready to get the roof inspected
Give the contractor the symptom rather than your diagnosis. The weather pattern and a few safe photographs can be useful.
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