Build a file for the existing house and a separate file for changes
A Tomales purchase may involve a village house, acreage near the village or a nearby agricultural property with several buildings. Begin by identifying the actual parcel and residence, then separate existing improvements from the buyer’s plans. A coastal application, County approval and completed building work are different kinds of evidence. The useful research file shows which document supports each building, use and system, while leaving unresolved questions visible before a buyer relies on an assumed entitlement.
The Tomales guide introduces the community, while the Marin County guide provides wider context. This article develops the parcel investigation within the buying process. Actual primary documents checked October 26, 2026 supply the examples. They are not homes inspected for a client, current listings or a certification that every existing improvement is permitted. Current agency decisions and physical condition must be established for the actual purchase.
Start with the parcel number and the applicable County route
Use the street address to locate the property, then reconcile the parcel number with the legal description and title file. Marin’s planning resources provide routes to property information and project records; the Assessor’s characteristics serve a separate assessment purpose. Do not treat an assessed building description as construction approval or assume a mailing locality identifies the permitting authority. Keep the full parcel number with every permit, plan and service request. Planning resources; assessment search.
A useful local example is 100 John Street, APN 102-073-05. The County’s retrieved P5888 project copy describes a detached ADU proposal on a property already developed with a residence and other improvements. That distinguishes the existing inventory from the proposed addition. The project copy is not an approval or completion record, and its current outcome should be confirmed before a buyer relies on the additional dwelling. P5888 project route.
For the existing residence, request its available construction, alteration and inspection history. For the proposed ADU, request the actual decision, conditions and any later building and service documents. Keep the two folders distinct. A plan drawing can show how the applicant intends to arrange buildings without establishing that the current house matches all historical approvals or that a new structure has been authorized and completed.
Read applicant material as a proposal
The August 2025 John Street statement describes an onsite well and water tower, a proposed public-sewer lateral and driveway and grading work associated with the ADU. These are applicant descriptions of the intended arrangement. They help identify the offices and specialists who need to review the project, but they do not certify current water performance, sewer capacity or safe site conditions. Ask for the agency and construction records that establish the actual approved scope. Applicant statement.
This distinction is particularly useful when a listing mentions future space. Identify whether the claim refers to a concept, submitted application, conditional approval, issued construction permit or completed inspected work. Record the date and supporting reference. An applicant’s proposed room count or expected construction duration cannot be substituted for a final decision or actual completion evidence. A buyer should be able to see the stage without having to infer it from an attractive rendering.
Coastal review does not replace the rest of the file
Ask the County to identify the actual coastal review route for the parcel and proposed work. Marin’s categorical-exclusion guidance describes applicable locations and criteria and the need for County approval before relevant permits. Do not assume every activity is excluded because a neighboring project used that route. Conversely, a coastal-zone label alone does not identify all requirements for a specific repair or addition. Provide a defined scope so staff can identify the applicable process. Coastal exclusion guidance.
A second nearby record, Farm LLC P4631, shows the next distinction. The April 2025 decision conditionally approves agricultural worker housing legalization and septic work on APN 100-050-26. That decision is different from an issued and completed building or system permit. Its conditions also address the housing purpose. Do not describe the unit as an unrestricted extra residence or treat the decision as evidence that every related improvement has been completed. Conditional decision.
The Farm LLC document uses several locality labels, with a Petaluma address in its header and rural Dillon Beach/Tomales context in its findings. Identify it by the Marin parcel and project number rather than assigning Sonoma County jurisdiction from the mailing name. It is a nearby rural record example, not a Tomales village service certification. Ask the agency and title reviewer to reconcile location and parcel details before applying an attachment or condition to the land being bought.
Match every attachment to the same project
Supporting files can contain inconsistent identifiers or reused material. The County-hosted Farm LLC plan extraction includes another project’s name, address and parcel reference on part of the material. That is a reason to verify the actual approved project-specific sheet set. Do not assign a tank size, system layout or private responsibility from an attachment until its parcel, project and sheet scope agree with the decision and property under review. Plan-file identity check.
Create a simple document index showing the source, date, parcel, project number, building and stage. If an attachment does not match, record the discrepancy and ask for clarification rather than silently choosing the most convenient reference. Keep originals available for the reviewer. The objective is a consistent chain from the legal parcel to the approved scope and physical improvement, not a large folder whose files cannot be connected reliably.
Utilities require their own confirmation
The Tomales Village Community Services District describes wastewater and park functions. Its name should not be used to assign household drinking water. The John Street proposal’s well-plus-sewer description illustrates why the two service questions must remain separate. For an actual purchase, obtain provider confirmation of the sewer account and approved use, and independently establish the domestic source, equipment and current testing appropriate to it. District role.
For a rural property on septic, obtain the County Environmental Health file, relevant design and installation records, repairs and current operating information. Ask a qualified reviewer to compare the actual residence and intended use with that evidence. Keep proposed system work separate from present condition. Marin’s septic-regulation update is an active policy process, so a future discussion or target should not be treated as an adopted requirement for the house. System records; regulation-update route.
| File item | Local example | What it supports | Evidence still needed |
|---|---|---|---|
| Parcel identity | 100 John Street / APN 102-073-05 | Address-to-project match | Legal description and complete relevant history |
| Proposed improvement | P5888 ADU materials | Applicant’s intended building/site arrangement | Latest decision, conditions and later permits |
| Conditional approval | Farm LLC P4631 / APN 100-050-26 | Defined agricultural housing and system scope | Correct plans, recorded conditions and completion records |
| Attachment identity | Mixed identifiers in extracted plan material | A specific reconciliation task | Actual approved project-specific sheets |
| Services and condition | Separate water, sewer/septic and access files | Which agency or specialist answers each question | Actual account, source, rights and current evaluation |
Sources: John Street project, Farm LLC decision and County coastal guidance. The index is an investigation aid, not a permit or title opinion.
Compare the records with the actual improvements
Use permissioned inspections and appropriate professional review to compare the visible structures with plans and descriptions. Identify additions, changed uses or system components that require further documentation without declaring them unlawful from an incomplete archive. Missing records can reflect a research gap, historical filing or another issue that staff must clarify. A physical observation and a permit history contribute different evidence; neither should be overstated as a complete account of the property.
Give access and site work the same attention as the house. Match the actual driveway, proposed changes, drainage features and private rights with their documents. A planning statement about an access corridor does not establish a recorded easement or current structural condition. Ask the relevant road and fire authorities about the actual proposed scope, and have qualified specialists evaluate concerns involving grading, drainage or retaining features where appropriate.
Resolve dependencies before relying on future use
Finish with a short unresolved-question log tied to the buyer’s actual plan. Identify which decision, instrument, account or inspection will resolve each material gap and who can provide it. The result should explain the existing house, the status of proposed improvements and the separate service and site responsibilities. That makes a Tomales purchase reviewable without turning an application, a conditional decision or an assessment entry into more certainty than the evidence supports.
