Measure before you mend
The simplest way to know whether a crack is active is to watch it. Mark each end with a pencil and the date, photograph it with a ruler beside it, and check again after a few months. A plastic crack gauge fixed across the crack gives a clearer reading.
A crack that has not changed can be repaired as weathering. One that has grown is a question for a structural or geotechnical engineer before any chimney work, particularly where the property sits within a mapped landslide area.
Tall chimneys on the downhill side of a house
On a hillside house, a chimney on the downslope side can rise a full extra storey from its footing before it reaches the roof. That height means more weight, more exposure to wind and salt, and more force concentrated at its base in an earthquake. Earthquake Country Alliance advises having inadequately braced chimneys checked, and the California Department of Insurance lists bracing among its retrofit measures.
Repairs on a stack like this often combine masonry work at the top with ties or bracing to the house, and reaching the upper courses can mean scaffolding from the lower grade.
Send photos of the cracks, ideally with a date or a ruler in shot, and tell us whether they have changed. Describe the problem and request an estimate.
Repair materials for full exposure
Mortar is matched to the brick so the joint stays the weaker part. Any steel added, such as ties, anchors or bracing, should be stainless, because ordinary steel rusts quickly in salt air and swells as it does. A rebuilt crown gets a proper overhang and drip edge so water leaves the stack instead of running down it.
What insurance does and does not cover
The California Department of Insurance says standard homeowners policies do not cover damage from earthquakes, floods or landslides. A chimney cracked by ground movement is therefore usually outside a standard policy; earthquake cover is separate, and the California Earthquake Authority writes most of it.
Wear and tear is also a typical exclusion, which covers most weathering. Check with the insurer before assuming either way.
Chimney repair cost in Rancho Palos Verdes
The variables are the extent of the damage, the chimney's height from its lowest footing, scaffolding on a slope, bracing or reinforcement, and brick matching. Any engineering assessment needed first is a separate cost.