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Start from your actual base budget and add only the contingency categories your team has chosen to model. ShelterMetric does not insert a default reserve percentage or treat the resulting buffer as a confirmed project cost.
ShelterMetric does not insert a universal contingency percentage. Your team should define each allowance using the project stage, known risks, contracts, procurement conditions and funding rules.
A reserve is useful when it communicates uncertainty rather than hiding it inside a single budget number. The shared Project Passport therefore stores this calculator result as a separate scenario in project notes and leaves the confirmed base-budget field unchanged.