Executive Summary
This is a 1921-built multi-unit property in San Rafael Heights with two structures on separate parcels: a main house (3 BR / 1 BA) and a rear ADU/cottage (1 BR / 1 BA) with separate utilities. The property was rented through early 2026, then vacated and prepped for sale with fresh paint, appliance replacements, and cosmetic work in April 2026.
Beneath the cosmetic refresh is a property with layered structural issues: active termite infestation across both structures, significant fungal damage extending through the mudsill and cripple walls, a sewer lateral requiring full replacement with open-trench street excavation, a sewage ejector pump that is recycling instead of discharging, and an electrical system that retains knob-and-tube wiring of unknown extent. The ADU has additional unknowns — its foundation system could not be confirmed, and the subfloor was partially replaced pre-listing due to discovered deterioration.
This is not a move-in-ready home. Someone with $150K–$200K above purchase price, a trusted contractor, and 12–18 months of patience could end up with a valuable Marin income duplex at a good basis. Someone who cannot absorb cost overruns should not buy this property.
Repair & Risk List
Northside Engineering report (3/21/26): full 108-ft lateral inspected, failed air test, roots at 21/25/27 ft, mixed cast iron/clay/ABS construction.
End-of-life infrastructure, root intrusion, mixed pipe materials. Pump system adds complexity to replacement.
Full open-trench lateral replacement with RVSD Shallow Trench Detail (concrete backfill on street section). RVSD requires this before the lateral will pass.
$13,800 per Northside bid (already in disclosures). Get a second bid. This is the floor, not the ceiling.
NBI Item 1.7: fungal and termite damage at mudsill and base of cripple wall framing on three sides of the main house (left rear, right rear, rear). Soil graded above foundation.
Exterior soil at or above top of foundation for extended period, allowing persistent moisture contact with wood framing. Classic Marin problem on older homes.
Remove and replace all deteriorated wood; raise stem wall to provide minimum clearance; anchor bolt upgrades. Building permit required. Estimate asterisked — full cost TBD after opening.
$15,500–$17,800 NBI minimum. Expect higher once walls are opened.
NBI Items 1.4 and 1.5. Active infestation confirmed at crawl space soil and ADU at time of inspection. Prior tube scraping at main house suggests previous treatment without eradication.
Typical Bay Area subterranean termite activity; soil-to-wood contact; chronic moisture conditions enabling colony establishment.
Full chemical treatment of foundation perimeter, both structures, including slab drilling. Structural damage repair at ADU framing. Must be completed before NBI can certify.
$1,800–$2,000 treatment + $1,900–$2,600 ADU framing repair. More damage may surface in concealed areas.
This system handles ALL waste discharge from both units. A recycling pump means sewage is not evacuating. This is not a deferred maintenance item — it is a sewage backup waiting to happen. The seller installed a new decorative cover on the sump box in April 2026 but did not fix the underlying mechanical failure.
Inspector found discharge piping leaking back into sump, causing continuous recycling. No alarm, no GFCI-protected dedicated circuit. AVID confirms pump clogged and failed during listing prep.
Service or replace ejector pump; install check valve on discharge line; install alarm/notification system; upgrade to dedicated GFCI circuit; verify permit status.
Inspector confirmed K&T wiring visible in attic (front unit). Mix with upgraded NM cable throughout. Ungrounded three-prong receptacles noted. Extent behind walls unknown.
Many Bay Area insurers will not write or will surcharge policies with active K&T wiring. Combined with the LRA fire hazard zone, this is a real insurance problem. Get carrier quotes before removing contingencies.
Electrical contractor assessment; likely full rewire required for insurance and safety.
$15,000–$35,000 for full rewire depending on extent and access.
Prior moisture in sub-area; sump pit too shallow; no check valve; no slope to direct water to pump; no dedicated circuit; no alarm. Sump replaced ~3 years ago per seller — design deficiencies not addressed at replacement.
Site drainage deficiency. Property sits low relative to street (evidenced by the ejector pump necessity). Downspouts currently discharge at foundation base.
Perimeter French drain system; downspout extensions; sump upgrade (deeper pit, check valve, alarm, GFCI circuit). Needs a comprehensive engineered solution, not a band-aid.
$15,000–$35,000 for comprehensive drainage remediation.
Inspector confirmed: unbraced cripple walls, posts not connected to piers, girder-to-post connections not reinforced, anchor bolts corroded and undersized.
Standard Marin cripple wall retrofit: shear panels, post-to-pier connectors, post-to-beam through-bolt straps, anchor bolt upgrades.
NBI Item 1.3: rot at rafter tails and eave sheathing on left and right sides of main house; carport area and entire right side of ADU. May extend into adjacent concealed sheathing.
Open repair areas; remove and replace deteriorated rafter tails and sheathing; coordinate with roofer for covering removal. Final cost TBD after opening.
Inspector flagged sag/deflection in roof structure at front unit (visible in attic and on roof plane) and rear unit. The 2018 roof contractor noted dry rot at installation — structural issue was not addressed then.
Structural engineer review; potential rafter sistering or ridge board reinforcement. Must coordinate with any future roof work.
Major System Condition Review
Pest / Termite Report Analysis
NBI inspection dated April 8, 2026. This is an above-average-severity report for Marin County. Multiple Section I items with asterisked estimates mean final costs will be determined in the field. No pest certification exists — you cannot get one until all Section I items are corrected and NBI reinspects.
Natural Hazard Risk Analysis
Permit & Unpermitted Work
Price & Market Context
| Item | Amount |
|---|---|
| List price | $1,175,000 |
| Price per sqft (1,482 sf) | $793/sqft |
| Sewer lateral (required, RVSD) | −$14,000 |
| Section I pest repairs (minimum) | −$30,000 |
| Seismic retrofit | −$13,000 |
| Drainage remediation | −$20,000 |
| Electrical (K&T rewire) | −$30,000 |
| Sewage ejector repair | −$5,000 |
| Roof sag investigation/repair | −$10,000 |
| Asbestos survey + allowance | −$10,000 |
| Windows, exterior repairs | −$15,000 |
| Soft costs, permits, contingency | −$20,000 |
| Total condition discount | −$167,000 |
| Effective all-in entry cost (at ask) | ~$1,260,000–$1,310,000 |
Hidden Homeowner Costs — 10-Year Horizon
These are predictable capital expenditures beyond the immediate repairs already identified above.
| Item | Estimated Cost |
|---|---|
| Full electrical rewire (K&T + panel upgrades) | $20K–$40K |
| Main house roof replacement (composition) | $15K–$25K |
| ADU roof replacement | $12K–$20K |
| Plumbing replumb (galvanized to copper) | $10K–$18K |
| Window replacement (both units) | $15K–$30K |
| HVAC replacement (front unit) | $12K–$20K |
| Drainage system (French drain, sump upgrade) | $15K–$35K |
| Foundation/seismic improvements | $15K–$30K |
| Sub-floor + attic insulation | $8K–$15K |
| Ongoing pest maintenance + warranty | $10K–$25K |
| Total 10-year capital exposure | $132K–$258K |
Family Livability Assessment
The main house is 3BR / 1BA at 1,482 sqft — a tight layout for a family, particularly with a single shared bath serving three bedrooms. The listing shows an enclosed front porch/sunroom that adds usable space. The rear ADU (1BR/1BA, separate parcels) provides meaningful income offset in a strong Marin rental market.
The property is in San Rafael Heights, adjacent to San Anselmo, with the Ross Valley School District (confirmed by the parcel tax line items). This is a legitimately desirable school district — a real livability asset.
Livability challenges right now are real. Floors are visibly uneven throughout (typical 1921 construction). Single-pane windows throughout mean poor thermal performance and noise transmission. The back bedroom has no closet and a possible egress deficiency. The laundry hookups exist but no appliances were present. Bathrooms lack mechanical ventilation.
For a family willing to treat the first 12–18 months as a renovation project, this property has genuine long-term livability upside — particularly given the ADU income. For a family seeking a move-in home, this is not it.
Final Recommendation
Top 3 Positives
- Two separate APNs with legal ADU provides genuine income potential — the math works over time in a strong Marin rental market.
- The disclosure package is relatively complete. You know what you're getting, which is unusual for a 1921 property.
- The 2018 roof on the main house (Class A, CertainTeed Landmark Pro) means one major capital item is partially addressed with ~12–17 years of useful life remaining if the sag issue is resolved.
Top 3 Risks
- K&T wiring + LRA fire hazard zone = real insurance problem. This alone could make the property uninsurable at conventional rates before you can solve it.
- Section I pest costs will grow. The $27K–$32K floor will almost certainly expand once walls are opened — particularly the mudsill/stem wall item (1.7), which tends to reveal more damage than visible during inspection.
- The sump/drainage/ejector cluster is a chronic site problem, not a one-time repair. It requires a comprehensive engineered solution. Every band-aid will fail again.