Home Inspection in Larkspur, CA

Madrone Canyon and Baltimore Canyon run back into the hills behind downtown Larkspur under second-growth redwood, and the houses in them sit in shade for most of the year. That is the defining physical fact about property in the canyons, and it changes the inspection. Surfaces that never get direct sun and never fully dry behave differently from the same surfaces two miles away: siding stays damp at the bottom courses, decks hold water in the joint between the board and the joist, exterior stair stringers rot from the inside where they meet the tread, algae and moss build on north-facing roofs and hold moisture against the shingle, and crawlspaces run at a humidity that supports fungal growth year round. We probe rather than look. A redwood board can read fine from six feet and be soft enough to take a probe at the ledger. The canyons are where we spend the most time on a moisture meter, and where the difference between a five minute walk-around and a real inspection is largest.

The consequence of perpetual damp is not a cosmetic problem, it is a structural one, and it concentrates in exactly the components that hold weight. Deck ledgers where the deck attaches to the house, and the flashing above them, are the first thing we open up visually. Post bases sitting directly on soil or on a pad that traps water rather than draining it. Guardrail posts bolted through a rim joist that has gone soft. Long exterior stair runs, which on a canyon lot are often the only way to reach the front door and are therefore the most heavily used structure on the property. Beam ends bearing into a hillside. Band joists behind siding that has been holding moisture for thirty years. Some of these are cheap to fix if they are caught while the damage is local. All of them are expensive if the first sign of trouble is a failure. We inspect for the mechanism, not just the appearance, and we say clearly when a component needs to be opened up by a contractor because the visible surface is not telling the whole story.

Larkspur was laid out by Charles W. Wright in 1887, got its first post office in 1891 and incorporated on March 1, 1908. The Larkspur Downtown Historic District along Magnolia Avenue was listed on the National Register of Historic Places in 1982, and buildings there go back to the 1890s. The residential stock near the downtown reflects that age and brings the findings that go with it: raised foundations with cripple walls that were never seismically retrofitted, original or partly replaced galvanized supply piping, electrical services sized for a very different era of household load, early wiring surviving in attic and wall cavities behind later work, and additions built to whatever the expectations were at the time. Historic district status also has a practical consequence buyers should understand up front. It can affect what exterior changes are permitted and how repairs have to be carried out, which is a planning department question rather than an inspection finding, but it belongs in the conversation before an offer rather than after.

Larkspur exists because of lumber. The county library's local history archive records two sawmills at the edge of today's downtown in the mid-nineteenth century: a government mill arranged in 1847 by Captain Joseph L. Folsom to supply the Presidio in San Francisco, and the Baltimore Steam Saw Mill, brought west by members of the Baltimore and Frederick Mining and Trading Company and running by the spring of 1850 at the mouth of the canyon that took its name from the mill. Both were gone by 1854. What that history left behind is a housing stock with a great deal of old-growth redwood in it, and a widespread belief that redwood does not rot. Old-growth heartwood is genuinely durable, which is why so much of it is still standing. It is not decay-proof, the sapwood is not durable at all, and a redwood member kept wet at a connection will fail like any other wood. We treat the species as a reason to look more carefully at the connections, not as a reason to relax.

The wooded canyons that make Larkspur beautiful also put housing against continuous fuel with limited road access. The Central Marin Fire Authority, which covers Larkspur along with Corte Madera and Greenbrae, received the State Fire Marshal's updated Local Responsibility Area fire hazard severity zone maps on February 24, 2025, ran a public comment period through April 2025, and is required under Government Code section 51179 to designate the zones by ordinance within 120 days of the state recommendation. The maps classify areas as moderate, high or very high, and a local agency may raise a classification but may not lower one. A designation carries real consequences: it can trigger enhanced building requirements and re-sale inspection obligations, and it becomes part of what gets disclosed in a transaction. What it is not is a statement about a particular house. We do not assign a hazard zone to a parcel. We document the building: roof covering and its condition, eave and soffit construction, vent openings and whether they are screened or ember-resistant, deck and under-deck conditions, siding and trim at grade, and the vegetation actually touching the structure. Check the current designation with the fire authority and the town, then have somebody look at the house.