Price variation clause: when escalation is allowed and how to claim it

A price variation clause protects both sides of a long contract from prices nobody could predict on bid day. Without one, a contractor on a three-year job must guess cement, steel and labour costs years ahead and price that risk into the bid. This guide explains when a price variation clause applies in government contracts, how the formula works under CPWD's Clause 10CC and the Department of Expenditure's model, with a worked example, and how to claim escalation without losing it on paperwork.

What a price variation clause means

A price variation clause is a term in the contract that changes the amount payable when the prices of key inputs move after the base date, normally the bid deadline. Instead of arguing over actual purchase bills, both sides agree in advance on:

• which inputs count (cement, steel, labour, diesel and so on),
• what share of the price each one represents (its weight),
• which published index measures it, and
• how often the adjustment is worked out, usually each quarter.

Tender documents call the same thing a PVC, a price escalation clause, a price adjustment clause or an escalation clause. It is different from a statutory variation: the works manual (para 5.4) says that if a new law or bye-law comes into force after bids are submitted and changes your cost, that extra or reduced cost is added to or deducted from the contract price, except what the indices already cover. CPWD handles that under Clause 10C.

When escalation is allowed in government contracts

The Department of Expenditure's manuals set the threshold:

The works manual says PVC "shall not be applicable in the contracts where period of completion is eighteen months or less". Both manuals allow an exception: a shorter contract can still carry a PVC for inputs prone to short-term price swings, especially for critical or high-value items.

The works manual also explains why a buyer offers it: a PVC lets contractors "factor this reduced risk and quote more competitive prices". It tells buyers to put their own formula in the tender, so that every bidder prices on the same base.

In CPWD contracts, Schedule F of your tender says whether Clause 10CC is applicable or not applicable. Where it is not, Clause 10C applies instead, which covers only price and wage increases caused directly by a new law, rule or order (not GST rate changes).

The price variation formula explained

The DoE model formula

The works manual's Annexure 5 gives a sample clause. Written out with its own terms, the adjustment works like this (the tender's own formula always decides):

Adjustment = (contract price ÷ 100) × [F + a × (M1 ÷ M0) + b × (L1 ÷ L0)] − contract price

• F is the fixed element, the part of the price that never varies (fixed costs and profit). The manual suggests 10% to 25%.
• a and b are the weights for material and labour. F + a + b = 100.
• M0 and M1 are the material price or index at the base date and at the date of supply; L0 and L1 the same for wages. More than one material can be split out (Mx, My, Mz).
• The base date is the bid submission deadline, and the indices used are from a stated time lag before it, because published indices come out late.

The same annexure adds conditions: no adjustment if it is 2% of the contract price or less, a ceiling stated in the tender, adjustment bills only quarterly, nothing on any part already paid as an advance, and no price increase beyond the original delivery period.

Example. Contract price ₹50 lakh; F = 15, a = 60, b = 25. The material index rises from 200 to 212 and the wage index from 150 to 156. Adjustment = ₹50,000 × [15 + 60 × 1.06 + 25 × 1.04] − ₹50 lakh = ₹50,000 × 104.6 − ₹50 lakh = ₹2.3 lakh, or 4.6% of the price, above the 2% threshold.

CPWD Clause 10CC formula

CPWD's GCC 2023 uses more components. For the construction period:

VW = W × (1/100) × [CP × (CI − C0)/C0 + LP × (LI − L0)/L0 + CMP × (CMI − CM0)/CM0 + EMP × (EMI − EM0)/EM0 + FP × (FI − F0)/F0 + SP × (SI − S0)/S0 + BP × (BI − B0)/B0]

• VW is the increase or decrease for the quarter.
• W is the cost of work on which escalation is paid: 85% of M, where M is the gross value of work done in the quarter, plus fresh secured advance and other advances paid (net of recoveries), minus anything paid at market rates for deviations under Clause 12.
• CP, LP, CMP, EMP, FP, SP and BP are the percentage weights for cement, labour, other civil materials, electrical and mechanical (E&M) materials, diesel, steel and bitumen, fixed in Schedule F for each work.
• The "0" values are the indices for the month of the last date for receipt of tenders (including extensions); the "I" values are for the quarter being worked out.

A shorter formula with labour, other civil and E&M materials and bitumen applies to any maintenance period.

Which indices are used

The wholesale price indices are those published by the Office of the Economic Adviser. For labour, Clause 10CC takes the higher of the minimum wage notified by the central Ministry of Labour and by the local administration for the place of work, and only the unskilled rate counts, whatever skills your workers have. CPWD uses this minimum wage, not a consumer price index (CPI), for labour; other buyers name their own index in the tender.

Indices other than labour are averaged over the three months of the quarter. A minimum wage revision during a quarter is paid at the new rate only for work done in later quarters.

Worked example: escalation under Clause 10CC

Say your CPWD contract runs 30 months and Schedule F marks 10CC applicable. In one quarter you billed ₹1 crore of work, with no advances or market-rate deviations.

Step 1: the cost of work. M = ₹1 crore, so W = 0.85 × ₹1 crore = ₹85 lakh.

Step 2: the change in each index. With these Schedule F weights and indices:

Step 3: weight × change. 10 × 0.05 + 25 × 0.05 + 35 × 0.04 + 10 × 0.02 + 5 × (−0.04) + 15 × 0.05 = 0.5 + 1.25 + 1.4 + 0.2 − 0.2 + 0.75 = 3.9.

Step 4: the escalation. VW = ₹85 lakh × (1/100) × 3.9 = ₹3,31,500 payable for the quarter.

The weights and index values above are ours, for illustration. Yours are in Schedule F and the published indices. Notice that diesel fell and pulled the total down: had all inputs fallen, the result would be negative and recovered from your bill.

How to claim price escalation

1. Check the clause before you bid. Is 10CC (or the tender's PVC) applicable? What are the weights, base date, threshold and ceiling? A fixed-price tender means the price risk is yours, so price it into your rates; our guides on schedule of rates and filling a BOQ help.
2. Save the base indices. Download the index figures for the base month the day bids close, and the minimum wage notification in force then.
3. Track bills by quarter. CPWD goes by the date you submitted each bill. The first payment comes at the end of three months after the month the letter to start work was issued (that month not counted), then every three months.
4. Work out the claim each quarter with copies of the index publications, and submit it even when it is zero or negative. The works manual (para 7.5.3) says the contractor "must submit its calculations for each bill, even if the payment on account of these variations is zero".
5. Keep inside the eligible period. CPWD pays escalation only for work done in the stipulated period plus extensions justified under Clause 5 without compensation under Clause 2. Get your extensions decided on time; our guide to liquidated damages explains how.
6. Close it before the final bill. Buyers settle PVC before final payment. If they pay first, the works manual asks you to sign an undertaking that there has been no fall in the indices and that you will refund any excess.

The works manual (para 7.5.3) adds that once PVC is paid, "no additional individual claim" is allowed for market rate changes, taxes or levies. The formula is the whole remedy.

When price variation does not apply

• Firm-price contracts: central works of 18 months or less and goods up to 12 months, unless the tender says otherwise.
• Clause marked "not applicable" in CPWD's Schedule F, leaving only Clause 10C for changes caused by new laws.
• Delay that is your fault, as above.
• Advances already paid: no variation on that part after the payment date.
• Small movements, below the threshold in the clause (2% in the DoE model).
• GST rate changes are not covered by CPWD's Clause 10C; the works manual says variations are worked on the basic price without taxes.
• Deviation items paid at market rates under CPWD's Clause 12 are excluded from the cost of work.

State departments and PSUs use their own versions, so read the clause in your tender. Long-duration works such as highways and large buildings are where you'll meet it most; search civil works tenders or CPWD tenders on GovtTenderHub and open the conditions of contract to check.

Common questions

What is a price variation clause in a contract?

It is a term that changes the contract price when published indices for materials, labour or fuel move after the base date, usually the bid deadline. It works upward and downward, normally every quarter.

Is a price escalation clause the same as a price variation clause?

Yes. Tenders use price variation clause (PVC), price escalation, price adjustment and escalation clause for the same idea. CPWD calls its version Clause 10CC, "Price adjustment for works".

For which contracts is price variation applicable?

Under the DoE Works Manual 2025, works with a completion period of more than 18 months, where the buyer considers it appropriate. For goods, the Goods Manual 2024 sets the line at deliveries longer than 12 months. Shorter contracts are normally fixed price.

Which index is used for price escalation?

CPWD's Clause 10CC uses wholesale price indices for cement, steel, diesel and bitumen, CPWD's own indices for other civil and E&M materials, and the minimum wage of an unskilled worker for labour. Other contracts name their indices in the tender.

Why is escalation calculated on 85% of the work done?

That is how CPWD's Clause 10CC defines the cost of work for escalation: W = 0.85 × M. The other 15% of the value is not escalated.

Can a contractor claim escalation during an extension of time?

Under CPWD's Clause 10CC, yes for extensions justified under Clause 5 without compensation under Clause 2. For delay that is the contractor's own fault, upward escalation stops at the original date.