Diesel rose R2,94 a litre in South Africa on 2 September 2026, and R3,15 on the lower-sulphur grade. Whether you recover any of that on a job you priced in June turns on whether the contract carries a fuel price escalation provision. If it does not, you absorb it. The arithmetic below is what you are absorbing.
What R2,94 a litre actually costs
Work in litres, not percentages, and work off the grade your tanks actually take. The Department of Mineral and Petroleum Resources put the wholesale increase at 293,90 c/l on diesel of 0,05% sulphur, the 500ppm grade, and 314,90 c/l on 0,005%, the 50ppm grade. Call it R2,94 and R3,15.
Every 100 litres of 500ppm diesel now costs R294 more than the same 100 litres did in August, and 50ppm costs R315 more. A site burning 2 000 litres a month is R5 880 worse off every month on the first grade and R6 300 on the second. Hold that for the six months left on a fixed-price order and it is R35 280 or R37 800, taken out of a margin that was set before any of it was known.
Petrol is the smaller number and it moves the light vehicles. Both 93 and 95 went up R1,34 a litre at the pump. Twelve hundred litres a month across a supervision fleet is R1 608 more.
One note on that R1,34, because the number you will see quoted depends on who is quoting it. The Department's announced fuel price adjustment for petrol is 129,00 c/l. Separately, the Minister approved a 4,9 c/l increase in the petrol price structure, from 315,1 to 320,0 c/l, to carry a MIBCO wage adjustment for forecourt employees. The two together are what moved the pump, and the published inland price for 93 confirms it: R25,42 to R26,76.
Where the increase came from
Higher international petroleum product prices carry most of it. Two smaller components are worth naming because neither is oil, and both are in the Department's own statement. The forecourt wage adjustment is the 4,9 c/l above. The slate levy rose 21,90 c/l, from 61,38 to 83,28 c/l, and is implemented in the price structures of both petrol and diesel from the same date. The cumulative slate deficit on the two fuels stood at roughly R9,519 billion at July 2026.
The instruments sit behind them. Three notices under the Petroleum Products Act were published on 1 September 2026. One is an amendment of the Regulations in respect of Petroleum Products. The others set a maximum retail price for liquefied petroleum gas and the single maximum national retail price for illuminating paraffin.
LPG went up 69 c/kg, and 79 c/kg in the Western Cape. That is a direct input cost for anyone installing or running gas, and almost nobody reads it. Illuminating paraffin rose 213,00 c/l at wholesale.
The effective date is 2 September 2026 for all of it. If a claim of yours turns on the day the price moved, that is the date, and the Department's media statement is where to cite it from.
Which contracts can move and which cannot
Three questions decide it, and you can answer all three in ten minutes with the contract open.
Does a price adjustment provision exist at all, and what does it index? Some are tied to a published index, some to a stated basket of inputs, some only to a change in law or tax. A clause indexed to something that did not move does not help you because fuel did.
What triggers it? A percentage threshold, a named index publication, a fixed review date. The trigger is what decides whether September counts or whether you carry it to a quarterly review.
Who must give notice, and by when? This is where most claims die. A provision you find in October, on a notice that had to be given in September, is worth nothing at all.
Do not reason across from one form to another. If your contract is a JBCC or NEC form, or if it refers to the CPAP indices, the provision has a name and a number in that document. Quote it. A claim that says "fuel went up" and cites nothing gets answered with silence, and then with a payment certificate that ignores it.
The cost is not only in your own tanks
Your subcontractors and your transporters are pricing the same increase, and they will bring it to you. Freight News reports South African road freight operators facing the choice between raising rates and drawing further on their own reserves to hold existing contracts. Road Freight Association chief executive Gavin Kelly puts fuel at between 35% and 55% of operating costs depending on route and vehicle. COSATU has called for the temporary fuel levy relief to be reinstated.
That matters for programme as much as for price. A haulier who cannot move at the old rate does not send a letter. The trucks simply arrive later, and a delayed spoil removal becomes a delayed slab.
Price the next one differently
Only one number in this is under your control, and it is not the pump price. It is how long your quote stays open.
State a validity period in days on every quotation and mean it. Put fuel on its own line where the contract allows it rather than burying it in a plant rate, because a line item can be adjusted and a lump sum cannot. Where a client insists on a firm price for longer than a month, that is a price with an insurance premium in it, and the premium belongs in the number.
Arabella sits on both sides of this one. We hold the client who signed a fixed price in June and the contractor now paying for the diesel, so the call asking whether a rate can move arrives here before it arrives anywhere else. How that works is set out on the contractor page, and the compliance and cost notices we read each week sit in insights.
On Monday
Pull your three largest open orders. Find the price adjustment provision in each one, or confirm there is none, and write the answer on the front page with the clause number next to it.
Then take the litres your site actually burned in August. Multiply by 2,94 if you buy 500ppm and by 3,15 if you buy 50ppm, and put that figure next to the months still to run on each contract. One of those three will be the one you have to talk to a client about this week, and it is better to know which today than at the final account.
