A Level 2 inspection adds two things to the basic version: a video survey of the flue interior along its full length, and examination of accessible attic, crawl space and basement areas where the chimney passes through.
That first item is the reason the level exists. Everything consequential about a flue's condition happens where you cannot see it.
The Three Levels, Briefly
NFPA 211 defines them, and knowing which is being quoted is worth a moment.
Level 1 covers the readily accessible portions of the chimney and the appliance connection. It is appropriate for a system in continuous service, with no changes, and no reported problems.
Level 2 adds the camera survey and the accessible concealed spaces. It applies when something has changed, when an appliance has been replaced, after an event that could have damaged the chimney, and at property transfer.
Level 3 involves removing parts of the structure — masonry, paneling — to reach concealed areas. It is reserved for cases where a serious hazard is suspected and cannot be confirmed any other way.
Why Property Transfer Triggers It
Because the buyer inherits a system whose history nobody can describe.
A general home inspection is a broad survey, and chimney flues are explicitly outside its scope — the equipment and the access are not part of it. An inspector can reasonably report that a fireplace exists and appears intact, and that tells you nothing about whether the liner forty feet up has separated at the joints.
A chimney can pass a home inspection and have a cracked liner. Those two statements are entirely compatible, and the gap between them is what Level 2 fills.
After an Earthquake
This is the California-specific trigger and the one most often skipped.
Seismic movement separates clay tile liner sections at their mortar joints. The tiles themselves crack. None of this leaves a trace visible from the room below — the fire still lights, the smoke still leaves, the firebox looks exactly as it did.
The 1994 Northridge and 1989 Loma Prieta earthquakes both caused widespread chimney damage, and in both cases a great deal of the repair work addressed the visible stack above the roofline. If a property has changed hands since, the internal condition is frequently an open question.
Where a survey finds liner damage, the work that follows is relining rather than repair, and it is a considerably larger job than a cleaning.
What the Camera Actually Shows
The survey is looking for a specific set of conditions, all of which are invisible otherwise.
- Cracked or spalled clay tile sections
- Joint separation between liner sections
- Missing liner entirely, in older unlined construction
- Deterioration in the smoke chamber above the firebox
- Obstructions, debris and nesting material
- Evidence of a previous flue fire
- Whether the flue is correctly sized for the appliance connected to it
When Level 1 Is Enough
Worth saying, since this piece could read as an argument for always buying the bigger service.
If you had a Level 2 eighteen months ago, nothing has changed, no appliance has been swapped, and there has been no significant shaking or flue fire since, a repeat full survey will very likely tell you exactly what the last one did. Level 1 is the appropriate annual scope for a documented, unchanged system in continuous use.
Level 2 is for changes, events and unknowns. If none of those apply, you are probably buying reassurance you already have.