Start with the condition of the units and joints
If the bricks or stone are sound and deterioration is concentrated in the joints, repointing may be suitable. When units are damaged or the structure has moved, joint repair alone may not address the problem.
Respect the existing masonry
For older brick, the properties of replacement mortar matter. The aim is compatibility with the original material, not simply the hardest available mix. Color and joint profile influence the finished appearance as well.
Find the contributing conditions
Water entry can accelerate deterioration. A repair plan should consider crowns, caps, flashing, and other relevant details so that new work does not leave the original moisture problem unresolved.
Get a clear description of the work
Ask which elevations or sections are included, whether brick replacement is needed, and how new work will meet existing material. If a rebuild is proposed, understand why more localized repair is insufficient.
Further reading: National Park Service preservation guidance. This general guide does not replace a property-specific assessment or the instructions for your appliance.