How we find the cause.
We assess the problem with the whole roof-water path in mind, from the gutter to the downpipe to the underground stormwater line it discharges into. Debris, damaged sections, failed joints and downstream restrictions all produce water where it should not be, and they need quite different work.
Roof access, height and roof condition decide how an inspection can safely be carried out, and work at height needs proper arrangements. Where the downpipe connects to underground stormwater, the fault may be below ground entirely, in which case a camera down the stormwater line answers the question faster than another look at the gutter.
What to send us
Photograph the problem from ground level, ideally while it is raining, because that shows exactly where the water goes. Note when it happens and where the overflow lands. Do not climb onto the roof or use a ladder you are not confident on: this is not the job to take a risk for.
What actually moves the price
Height, safe access, the length affected, the material and the connection to underground stormwater all influence the work. Have the assessment and the repair scoped together so you are not paying twice to get someone back up there.