Pricing a Brentwood home requires a comparison of the property buyers can actually acquire. An original model plan, an unfinished ADU and an association’s amenities do not carry the same evidence. Before choosing a price, define the completed configuration, document important changes and identify the ownership obligations. The Brentwood guide introduces that completed-property approach; this article develops a local method for deciding which closed sales belong in the analysis.
No permissioned MLS export or other verified closed-sale dataset was supplied for this research. This is therefore a complete evidence and comparable-selection method, not an empirical CMA or an appraisal. It contains no invented transactions, sale prices, adjustment coefficients or claim of named professional review. Current City records, developer materials, public tax bills and the club operator’s description provide real local examples of distinctions a later sales analysis needs to address.
Define the subject before selecting sales
Create a dated subject sheet separating the main dwelling, accessory improvements, lot utility and ownership terms. Identify the source behind each important feature. Approved plans may describe an addition; a completion record addresses a different question; an inspection documents conditions within its scope. A listing’s room count or square footage should not silently override a conflicting City record. Flag the conflict and obtain the appropriate explanation before using that feature as a basis for comparison.
The City ADU register shows why this matters locally. At 633 Third Street, B26-0466 lists 749 square feet, June 2026 approval and issuance, and a construction-stage classification when checked October 26. That entry can support a subject-file note about an issued project. It cannot support the statement that 749 square feet of additional completed living space is available for immediate occupancy or should receive the same market treatment as a completed unit.
The separate 997- and 492-square-foot entries at 717 Dainty Avenue introduce another problem. Two permit entries do not by themselves establish the completed dwelling count, current configuration or legal use of every area. If the subject or a potential comparable has a similar record pattern, obtain the approved scopes and completion evidence. An uncertain configuration may justify holding a candidate out of the primary comparison until the issue is resolved, rather than hiding the uncertainty inside a numerical adjustment.
Choose a comparison group that reflects the same decision
Begin with verified closed sales that compete for the same intended property use and ownership arrangement. Then examine location, building configuration, condition, lot utility and sale timing. Geographic proximity is useful, but it is not sufficient. An adjacent property with an unresolved accessory project may be less informative than a documented completed property somewhat farther away. The reason for including or excluding each candidate should be visible to the reviewer.
The State Board of Equalization’s dated sales-comparison guidance provides methodological context about similarity and legally permitted uses. It is assessment guidance from 2014, not a current universal rule for private CMAs. Its useful lesson here is to document comparability rather than treating a convenient numerical field as the whole analysis. The actual transaction evidence and an appropriately qualified reviewer must support the eventual property-specific conclusion.
Keep an evidence column beside every proposed sale. Record the verified closing date and price, the source permitted for use, relevant concessions or terms when available, and the configuration at the time of sale. A current photograph may show work completed after that transaction. A present tax entry may reflect a different assessment period. The comparable should describe the property that changed hands, not a mixture of information from several later dates.
Separate new-home offers from closed transactions
Orchard Grove’s current developer page identifies new single-family homes and individual marketing examples, including 427 Trellis Way. Those offers can help explain the choices a buyer sees today. They are not permissioned evidence of a recorded closing at the advertised price. A recently sold label on a website also does not supply every transaction term or establish which options and incentives were included.
When comparing an existing house with competing new construction, build a delivered-scope schedule. Identify included finishes, selected options, completed outdoor work, remaining landscaping and any documented concessions in the actual transaction evidence. Keep promotional financing or incentives in their own field for appropriate review. An existing house with a completed yard should not be described as equivalent to a new lot needing outdoor work solely because their main-house areas look similar.
For a seller, this schedule can reveal which features need better documentation before marketing begins. Collect records for additions and substantial later changes, and describe what is complete versus proposed. Avoid pricing a hoped-for project as if it were already delivered. For a buyer, the same schedule keeps the cost and time of making a property usable for the intended purpose visible alongside the purchase price.
| Local distinction | Verified starting point | Required comparable evidence | Treatment before verification |
|---|---|---|---|
| Issued accessory project | 633 Third Street B26-0466: 749 square feet; construction-stage register. | Approved scope, final status, actual configuration and condition at sale. | Do not count as completed occupancy space or assign an ADU premium. |
| Multiple accessory entries | 717 Dainty Avenue: separate 997- and 492-square-foot entries. | Each file matched to structure, legal use and transaction-date condition. | Do not sum as verified completed living area or infer dwelling rights. |
| Competing new-home offer | Orchard Grove / 427 Trellis Way marketing example. | Verified closed transaction, delivered options, outdoor scope and documented terms. | Keep as current offer context until actual closing evidence is obtained. |
| Association and club | Trilogy operator identifies owner HOA and club relationship. | Actual governing packet, dues, financial obligations and comparable ownership terms. | Do not assume another development has equivalent benefits or duties. |
| Public carrying charges | Third Street and Dainty Avenue have different current annual bills. | Current subject charges and appropriate future-assessment estimate. | Budget context; not sale prices, market values or automatic price adjustments. |
For each eventual verified closed sale, complete: evidence permission / sale date / price / terms / ownership / configuration / improvement completion / lot utility / condition / source conflict / inclusion reason / reviewer. Leave adjustment amounts blank until market evidence supports them.
Document shared obligations without inventing a price effect
The Trilogy at the Vineyards club operator says owners belong to the HOA and Club Los Meganos forms part of the association. That relationship is material to ownership comparison. It does not supply the current dues, reserve position, policy coverage or a market-derived value for the amenities. Obtain the actual packet for the subject and any proposed comparable before calling their shared responsibilities equivalent.
A detached house with association duties may compete differently from another detached house with different responsibilities. Record the difference before deciding whether the sale belongs in the primary group. If a reviewer uses a broader comparison, the file should explain why it remains useful and what uncertainty remains. The presence of a club is not a defensible reason to invent a fixed dollar premium or apply an unsupported percentage across unrelated transactions.
Use public tax records for the question they answer
The current public annual bills for 633 Third Street and 717 Dainty Avenue illustrate different carrying-charge records. Dainty includes an ECCFPD CFD 2020-1 line that is absent from Third Street’s bill. Preserve that distinction in ownership-budget work. The difference does not establish a price adjustment, a private association obligation or a completed-improvement value for either property.
Assessed values also answer a different question from market pricing. Do not substitute a tax assessment for a closed sale because it is readily available. Keep the assessment date and fiscal period visible, and obtain appropriate information about a buyer’s future assessment separately. Public records can help identify a parcel and raise useful verification questions, while the eventual pricing conclusion still needs actual transaction and property evidence.
Show uncertainty in the final pricing discussion
Retain rejected candidates in a short research log. For example, Brentwood’s under-review entries at 720 Bramhall Street establish proposed accessory work, while the issued Third Street entry establishes a later administrative stage. Neither belongs in a completed-ADU sales group merely because its proposed area resembles another unit. A rejection note identifying the missing completion evidence is more useful than quietly deleting the candidate, because it shows the reviewer how the group was assembled and what new information could change that decision.
Once a permissioned sales file exists, sort candidates by the strength of their match and evidence. Explain primary candidates first, then use weaker or competing-property examples as context. If the result changes substantially when an uncertain accessory configuration is excluded, report that sensitivity in plain language. Resolve the uncertainty where possible rather than presenting a precise range that conceals a major unanswered property question.
Review the completed analysis with the appropriate professional before using it for a pricing decision. The selling process guide helps organize preparation and marketing timing, and the Contra Costa County guide supplies wider jurisdiction context. The useful local outcome is a defensible explanation of which completed properties competed, what the evidence shows and which differences remain uncertain. A price conclusion can then follow the documented comparison instead of preceding it.
