Last updated: July 2026. Every price on this page was checked against the named UK sources on 8 July 2026.
A Vauxhall Corsa alternator replacement costs £295–£580: ClickMechanic’s Corsa average is £295 while Bumper puts the Corsa at £420–£580; UK-wide, alternator jobs average £250–£535 depending on the source (2026 prices).
That is an unusually wide spread between sources, so below we show exactly who publishes what before you compare quotes.
Price basis: figures are shown as the named sources publish them. Where a source states whether VAT is included we say so; where it does not, treat the figure as indicative and ask for a VAT-inclusive quote. Garages often quote without VAT, so 20% may be added to the bill. We label estimates, marketplace averages and real invoices separately — why that distinction matters.
Corsa alternator cost across sources
| Figure | Price | Source |
|---|---|---|
| Vauxhall Corsa (model average) | £295 | ClickMechanic |
| Vauxhall Corsa (model band) | £420–£580 | Bumper |
| Vauxhall (make average) | £477.93 | FixMyCar |
| UK average | £250 (£150–£400) | ClickMechanic |
| UK average | £458 | RAC |
| UK average | £535.05 (£250–£800) | FixMyCar |
Why the spread? ClickMechanic’s figures skew towards straightforward jobs booked at fixed prices, while marketplace averages (FixMyCar, and Bumper’s £525 average) include harder cases and pricier reconditioned-versus-new part choices. Treat £295 as a good-case independent quote for a Corsa and roughly £480–£500 (FixMyCar’s Vauxhall average and the middle of Bumper’s band) as the realistic middle.
Battery or alternator? Diagnose before you spend
The two faults mimic each other, and the price difference is huge: a 12V battery averages around £300 fitted (Checkatrade) against £300–£500+ for an alternator job. The pattern that points to the alternator: a battery that goes flat again after a full charge, lights dimming at idle and brightening with revs, a whining or grinding from the front of the engine, and the battery warning light while driving. Any garage can run a charging-system test in minutes: insist on it before authorising an alternator, and check the earth straps and connections have been ruled out too.
Parts and labour on an alternator job
Unusually for this site, parts dominate: the alternator itself is most of the bill, while labour runs only 1–2.5 hours. ClickMechanic, Bumper and FixMyCar all publish that band, with FixMyCar pricing the mechanic’s time at £150–£300 and Bumper at £150–£250. A remanufactured alternator against a new OE unit is the main lever on the parts side: remanufactured units are professionally rebuilt and typically warrantied, and asking which type your quote assumes is the fastest way to explain a £200 difference between garages.
How long do alternators last?
Three sources (FixMyCar, Bumper and the RAC) publish the same lifespan band: 80,000 to 150,000 miles. On an older Corsa, a failing alternator is wear, not bad luck.
What changes the price of an alternator
- New vs remanufactured unit: the largest single swing in the parts bill.
- Engine variant and access: tighter engine bays add labour time within the 1–2.5 hour band.
- Diagnosis first: a flat battery or corroded connection can mimic a dead alternator.
- Auxiliary belt: often renewed at the same time; check whether the quote includes it.
- Location: RAC city data spans £422 (Sheffield) to £507 (Bristol) for the same job (average price quoted for RAC Mobile Mechanics, January to March 2025).
Frequently asked questions
How long does a Corsa alternator replacement take?
Between 1 and 2.5 hours, with an average just over an hour. ClickMechanic and Bumper publish matching bands, and FixMyCar says no more than two and a half hours at a reputable garage.
Can I drive with a failing alternator?
Only briefly. The car is running off the battery, and when it empties everything stops, potentially mid-junction. If the battery light is on, drive directly to a garage or stop.
Is it the alternator or just the battery?
A battery that goes flat again after a full charge, dimming lights at idle or a whining noise point to the alternator. Any garage can run a charging-system test in minutes: ask for that before authorising a replacement.
Why did I get quoted £600 when averages say £300?
New OE parts, dealer labour rates and awkward variants push quotes up: FixMyCar’s typical range reaches £800. Ask whether the quote uses a new or remanufactured unit and compare like for like.
Related guides
Sources: ClickMechanic Vauxhall alternator pages, FixMyCar alternator cost guide, Bumper alternator guide and the RAC, all checked 8 July 2026. Bumper and FixMyCar Vauxhall figures re-checked and corrected 14 October 2026. UK average from ClickMechanic alternator estimates, checked 14 October 2026. See how we verify prices.