San Martin Home Value Estimator: 2026 Local Comps

San Martin (95046) is the most distinctive housing market in the South Valley. Unincorporated Santa Clara County, 1+ acre lots are common, most parcels are on well and septic, and the median home price runs higher per sqft than either Morgan Hill or Gilroy. If you own a home in San Martin, generic state-wide home value tools will undervalue you by 10 to 20%.

Use our free San Martin Home Value Estimator for a 60-second comp-based estimate calibrated to local 95046 sales.

What San Martin homes actually sell for in 2026

Recent 90-day comps for 95046 show:

• 3 bed/2 bath on 1+ acre: typical range $1.4M to $1.8M
• 4 bed/3 bath on 1+ acre: typical range $1.7M to $2.4M
• Multi-acre estate properties (5+ acres): $2M to $3.5M+
• Median price per sqft (95046): roughly $720 (vs $680 in 95037 Morgan Hill, $580 in 95020 Gilroy)

Why San Martin values differently

Three things make San Martin homes different from the rest of the South Valley:

• Lot size. Most parcels are 1+ acre, often 2 to 5 acres. Buyers pay for the land, not just the house.
• Well and septic. No municipal water or sewer connections. Modern wells (drilled since 2010) and conforming septic systems add real value. Older systems with deferred maintenance subtract real value.
• Agricultural and equestrian use. San Martin properties often have stables, vineyards, or orchards. These can add or subtract value depending on the buyer pool. Equestrian families pay premiums; tech-commuter families do not.

What our estimator accounts for

The San Martin Home Value Estimator uses 95046-specific 90-day comps and adjusts for:

• Lot size (acreage matters more in San Martin than the South Valley average)
• Bed/bath count
• Year built (matters for septic system age estimation)
• Square footage
• Condition (well-maintained vs deferred maintenance)

The per-square-foot baseline for 95046 is recalibrated monthly from actual San Martin sales. We don't average San Martin into San Jose data the way Zillow does, which usually undervalues your property by $100K to $200K.

Building an ADU in San Martin

San Martin parcels are bigger, which is why detached ADUs look and live better there than on smaller lots. The trade-off is permit complexity. ADUs in unincorporated SCC trigger Santa Clara County Environmental Health septic review, fire marshal review (for parcels in high fire severity zones), and well water testing if you're adding bedrooms. Typical all-in permit cost runs $10,000 to $18,000, vs $3,000 to $10,000 in Morgan Hill or Gilroy.

The upside: rental rates are higher in San Martin ($3.40 per sqft, vs $3.20 in Morgan Hill, $2.70 in Gilroy). If you're planning a build-and-rent strategy on a 1-acre San Martin lot, the math often works.

Run your numbers

Plug your home into the San Martin Home Value Estimator. Pick 95046 as your zip, enter your bed/bath/sqft/lot, and you'll get a comp-based estimate in 60 seconds.

Related tools

• Net Proceeds Calculator (what you'd actually net selling, after commission, transfer tax, and capital gains)
• ADU Cost Calculator (San Martin permit fees and septic adders baked in)
• Property Tax + Prop 19 Calculator (over-55 base transfer if you're moving from a higher-base SCC home)

Sheena and Ryan cover Morgan Hill, Gilroy, and San Martin in a free weekly newsletter. Subscribe here.