Stratum Cost Segregation

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ADU added to a rental preparation files

An accessory unit may share services with an existing rental. Reconcile new construction and allocated shared costs without counting the same system in both buildings.

Preparation resource. Record completion does not determine eligibility, deductions or tax savings. Ask your qualified tax professional to resolve the facts and applicable rules.

Start with the operating facts

A backyard unit connects to the main house's water and electrical service.

Specifically review the risk of duplicating shared utility costs across two studies.

Collect ADU plans; permits; contractor costs; utility routes; and completion records. Match each document to the relevant entity, property and reporting period. Then choose the decision below that matches the question you need to resolve.

Cost-pool reconciliation exercise

Reconcile a proposed study total with the source cost file.

Invoice overlap exercise

Check whether contractor packages and direct purchases count the same cost twice.

Quantity reconciliation exercise

Compare report quantities with the supported inventory.

Location trace exercise

Trace every material entry to a property, building, unit or work area.

Owner-payer-user exercise

Identify whose report and tax schedule the evidence belongs to.

Date sequence exercise

Check the timeline supplied to the report provider.

Existing schedule tie-out

Connect the study entries to the asset history already maintained.

Draft correction exercise

Track material report questions through dated corrections.

Removal-retention exercise

Reconcile removed, retained and new work across a project.

Estimate disclosure exercise

Identify what is documented and what is reconstructed in the report inputs.

Preparer implementation exercise

Make the final report handoff and filing responsibility explicit.

Future disposition exercise

Preserve the report history for a later replacement or property sale.

Source and review boundaries

Use the following primary guidance to frame the questions. The worksheet organizes facts; it does not replace analysis of the relevant year, ownership, elections or state treatment. Record the applicable period, confirm the source version and retain the preparer's written conclusions with the supporting documents.

Published 2026-10-09. Prepared by Stratum Cost Segregation as an educational record-collection resource.