Look at the joints, not just the stain
Missing mortar, debris below a stack or damp around a chimney breast are reasons to arrange an assessment. They do not establish that repointing alone will solve the problem.
What the inspection should separate
The mortar joints, masonry, flashing and top of the chimney all deserve attention. Loose or moving masonry needs a different response from weathered joints on a stable stack. Mention a shared chimney or any loose material when enquiring.
When repointing may be appropriate
Repointing addresses defective joints where the surrounding masonry is suitable. The replacement mortar needs to be compatible with the existing brick or stone. If the stack is unstable or units are badly damaged, a wider repair or specialist assessment may be needed.
What to agree beforehand
The quotation should identify the faces and height of stack included, any masonry replacement, the proposed mortar and whether flashing or flaunching is part of the work. Scaffolding and protection from falling debris should be addressed explicitly.
Will this make the flue safe to use?
External masonry work does not establish the condition or safety of the flue. Keep that question separate from the roof repair. Read the broader chimney assessment guidance or prepare for access and disruption.
Talk through the next step
Tell us what you have noticed and share your postcode. Photos taken safely can help explain the problem.
Discuss chimney repointing or explore chimney repairs & leadwork.