Estate-Grade Due Diligence

California's standard residential purchase contract typically allows a 17-day inspection contingency. For median $1–3M homes, that window is enough for a general home inspection, termite/pest inspection, and a preliminary title review.

An $8M+ estate is a different category. An 8,000 sf Atherton compound, a Woodside ranch with stable and olive grove, a contemporary Los Altos Hills minimalist — each has its own inspection profile, and that profile rarely fits into a 17-day window.

Four reasons the work expands. First, system depth — central HVAC, hydronic radiant, pool, spa, solar, generator, elevator — every major system warrants its own specialist. Second, renovation history — luxury homes typically carry several rounds of remodel work; permit and final-inspection records on each round have to be verified. Third, lot characteristics — slope, woodland, creek-adjacent parcels carry geotechnical, drainage, and Fire Hazard Severity Zone exposure. Fourth, title and legal complexity — historical subdivisions, easements, and CC&R restrictions can shape the property's future use for decades.

We typically negotiate a 21–30 day inspection contingency on $8M+ deals, with explicit per-discipline completion deadlines so nothing material remains open at expiration.

An estate's value depends on the lot as much as the structure. In Woodside and Los Altos Hills, lot risk runs deeper than on flat parcels.

Geotechnical / soil report. Slope parcels and any expansion plan warrant a geotech report — soil bearing capacity, liquefaction risk, expansive soils. If the seller does not provide a current report, commission one ($3,000–8,000 depending on parcel size and complexity).

Drainage. Large parcels need surface and subsurface drainage examined. Are there known ponding zones? Is the stormwater system code-compliant? Are drainage rights and obligations with neighboring parcels documented? Some luxury homes flood the basement or garage in heavy rain — and the seller's disclosure does not always mention it.

Trees. Many Silicon Valley estates carry heritage oaks or redwoods, often protected by local tree ordinances. Removal requires permitting; large-tree root systems can damage foundations, plumbing, and hardscape. Engage a certified arborist for a health assessment of significant trees and confirm the local tree ordinance's reach.

Fire Hazard Severity Zones. California has classified most of Woodside, Los Altos Hills, and surrounding hillside areas as high or very-high FHSZ. Direct effects: insurance availability and cost (some carriers have exited high-zone markets), code requirements on roof and exterior materials, and ongoing defensible-space obligations. Confirm insurance availability and a binding premium quote with a specialty broker before signing.

Geological hazards. The California Geological Survey publishes Seismic Hazard Zone maps with landslide and liquefaction overlays. Woodside and Portola Valley have a landslide history; pull the relevant CGS layers into the diligence package.

Title and legal review is the most under-weighted slice of luxury diligence — and the area where missed problems compound the longest.

Easements. The Preliminary Title Report's easement schedule deserves a line-by-line read with counsel. Common types: utility easements (PG&E, water utility access), access easements (a neighbor's right to cross), view-protection easements (no obstructions in defined zones). Some easements materially constrain remodel and addition plans.

CC&Rs. If the property sits inside an HOA, the CC&R document specifies architectural review thresholds (exterior changes, additions, fence height), use restrictions (parking, pets, rentals), and the HOA's financial position (reserve adequacy, special-assessment history). Get the HOA's last three years of financials and meeting minutes.

Permit history. Pull the property's complete permit record from the city or county building department. Verify each historical renovation has a permit and a final inspection. Unpermitted work is one of the most common legal risks in luxury — government can order removal or retroactive permitting (potentially hundreds of thousands of dollars), insurance may decline claims tied to unpermitted areas, and the issue resurfaces at every future sale.

Boundary. Large parcels need a current survey by a licensed land surveyor ($2,000–5,000 depending on size). Old parcel-split records or neighbors' fences and structures crossing the line produce real disputes.

Title insurance. Luxury transactions typically use ALTA Extended Coverage — broader than the standard CLTA — covering unrecorded easements and survey errors. In negotiation, confirm all known easements and restrictions are listed and that material limits sit inside the coverage envelope.

Effective luxury diligence requires multiple specialists working in parallel within a defined window. Below is the typical configuration on $8M+ engagements.

Core team. General home inspector (ASHI or CREIA certified). Licensed structural engineer for foundation, framing, and seismic. Specialist inspectors — pool/spa, roof, chimney (if any), elevator (if any). Smart-home and security assessor for current state, transferability, and ongoing maintenance cost. Geotechnical engineer for slope or expansion-plan parcels. Certified arborist for significant tree assets. Real-estate attorney for title, easements, CC&Rs, and permit-history review.

21–30 day timeline. Days 1–3: receive and review seller's disclosure package; schedule all inspections. Days 3–10: complete the major inspections (general, structural, all specialty systems). Days 10–15: collect reports; counsel reviews title and permits. Days 15–20: internal review of material findings; decide on repair/credit requests or exit. Days 20–25: submit Request for Repairs or price adjustment; negotiate. Days 25–30: release contingencies or terminate.

Diligence budget. For $8–15M estates, complete professional fees typically run $15–35K — under 0.3% of price, with the potential to identify problems that save many multiples of that or surface a transaction not worth pursuing. We coordinate the team and the calendar to keep the schedule tight.