A contingency reserve in an estimate helps set aside money for work and costs that may only become necessary later. The estimator reviews the project risks and applicable rules, and the client can see what the reserve is meant to cover. Document any change to the contract price separately under the contract and the law.
Contents:
What to allow for in a contingency reserve
First, include known work, materials and quantities in the main estimate. Then list the risks you cannot yet assess precisely, such as possible damage to the surface beneath existing cladding. State when you can check the condition and what work it might add. This shows the client which uncertainties the reserve covers.
Why an estimate increases
- If you discover that known work was left out, a measurement was wrong or a formula contained an error, correct the original estimate and show which items changed.
- If the client adds work or changes a decision, show the change in scope in a separate calculation so you can agree on the effect on cost and timing.
- If a hidden defect becomes apparent after demolition, note its location and condition, take measurements and attach photos. This evidence supports the proposed scope of additional work.
This helps you identify the reason for the change and decide what information you need to check deviations from the estimate.
Contingency reserves under Russia’s Methodology No. 421/pr
First, check where the methodology applies under paragraph 3 of the methodology (in Russian). It covers, among other cases, construction financed from public budgets or with funds from the organisations specified in that paragraph, certain major repairs to common property in apartment buildings, and other cases provided for by federal law or contract.
Paragraph 179 (in Russian), as amended by Order No. 42/pr of the Russian Ministry of Construction dated 30 January 2026, sets upper limits for the reserve. The limits depend on the type of facility.
- Up to 2% for capital construction facilities for non-production use
- Up to 3% for capital construction facilities for production use and for linear facilities
- Up to 10% for unique, especially hazardous and technically complex capital construction facilities under Article 48.1 of the Urban Planning Code of the Russian Federation
The reserve covers work and costs whose need becomes apparent when working documentation is prepared, when design decisions or conditions set out in the design documentation are clarified during construction, or when complications are discovered that stem from changed or previously unaccounted-for factors, conditions or methods of work. The client sets the amount in agreement with the chief administrator of the funds of the relevant budget. If the client is itself that administrator, it sets the amount without that separate agreement.
Calculate the reserve on the total for Chapters 1–12 of the consolidated cost estimate. Show it on a separate line after that total and allocate it across columns 4–8. For an estimate outside the scope of the methodology, set the reserve based on project risks, the contract and applicable rules.
How to justify additional work
- Record what has changed. Give the reason, location, measurements and additional quantities. Attach photos, a survey record or another supporting document.
- Calculate the change to the price and schedule. Check the contract and applicable rules, notify the client through the prescribed procedure, and obtain the necessary approval before starting the additional work if the contract or law requires it.
- Once the work is complete, enter the actual quantities in the work report in 101 (in Russian). If you need a work acceptance certificate (in Russian), generate it for the relevant period and check the items, amounts and parties’ details before sending it for signature.
Under Russian law, a change to a fixed price requires a separate basis. When checking that basis, consider Article 709 of the Russian Civil Code (in Russian). For construction contracts, also check the procedure under Article 743 of the Russian Civil Code (in Russian) for notifying the client about work that was not accounted for. If the client is acting as a consumer, also check which estimate rules apply under Article 33 of Russia’s Consumer Protection Law (in Russian).
How to discuss changes with the client
When agreeing on the estimate, show the client the original quantities, possible risks and how you will recalculate the estimate. Agree on who receives notifications and where the parties record their decisions. If a condition on site changes, send the calculation and supporting evidence through the agreed channel. The client can then see what quantities have been added, how the timing and cost change, and what decision is needed.
