Can we reuse old replacement costs in a Reserve Study Update?

Reviewed on October 12, 2026

A documented prior cost may support an Update when its component, scope and date are clear. It still needs review against current work, conditions and available evidence.

Establish what the old amount measures

Identify the building or component, quantity, repair or replacement scope, source and basis date. A cost per square foot is different from a whole-component total. A partial repair invoice does not establish the cost of full replacement.

The association's invoice or documented component history may be useful evidence for a customized asset. A prior study amount can also be considered when its basis is sufficiently clear. An unexplained copied value is not a defensible basis by itself.

Keep source, study-date and future-year amounts separate

Three dates and meanings in a cost basis
Amount and date	Meaning	Evidence to retain
Original amount at the source date	The supported historical rate or project total for the stated scope	Source document, component, quantity, units and basis date.
Restated planning amount at the study date	The reviewed basis brought to the date being studied	Restatement assumptions, scope adjustments and limitations.
Forecast amount for the replacement year	A future planning estimate under approved study assumptions	Expected timing, forecast assumptions and refresh action.

These are different amounts for different purposes. A forecast is a planning estimate, not a future contractor price. No single inflation rate or copied invoice is automatically appropriate for every component.

When can building-specific history help?

For a customized component, documented history for the same building and scope may be more useful than a broad comparison. Ballast may use it after professional review, retaining the original source, restatement assumptions, limitations and recommended refresh action.

Association confirmation can supply information about a carried value. It does not replace the professional decision to accept, reject or seek stronger support for the basis. Historical evidence also does not automatically qualify for a statistical cost comparison.

When is stronger evidence needed?

Changed scope, unclear quantity, a weak source or an approaching project can call for a current quote, measurements or professional clarification. Ballast recommends stronger project-specific evidence as replacement approaches, particularly when the basis is weak or stale.

If the available evidence cannot support a material cost, the professional reviewer decides whether further work is needed before issuance or whether a limitation and required action can be disclosed.

What should the board gather?

Keep the prior component entry, supporting invoice or project history, quantity or specifications, basis date and any current proposal together. The records checklist separates initial preparation from later evidence requests.

For completed projects, record exactly what was done and spent. If two studies carry different amounts, compare their inputs before their totals. Use the reviewed cost and timing changes in the budget check, rather than assuming they establish a contribution direction.

Sources

ICBI Generally Accepted Reserve Study Standards, revised July 2020, Field Standards: component analysis and retained evidence.

Primary source accessed October 12, 2026. ICBI provides professional guidance, not a legal intake checklist or a certification of Ballast. The preparation and cost-basis guidance above describes Ballast's planning approach.