See an indicative UK alternator replacement cost, typical labour time, common symptoms and what can make the final garage bill higher or lower.
£250–£520
AutoAid reference: parts £110–£380, around 1.8 labour hours, using the current built-in UK labour reference of £78/hour.
This is a broad independent-garage sense-check, not a live quote. Vehicle specification, location, parts quality, corrosion and access can materially change the total.
An alternator keeps the battery charged while the engine is running and supplies electrical power to the vehicle. Replacement cost varies mainly with the alternator itself, how easy it is to access and the labour rate in your area.
Some alternators are easy to reach while others sit behind covers, belts or other components. Stop-start and smart-charging systems can also use more expensive units. New, remanufactured and manufacturer-branded parts can differ substantially in price.
A battery warning light, dimming lights, repeated flat batteries, electrical systems behaving unpredictably or a vehicle that stops after the battery has discharged can all fit an alternator or charging-system fault. A weak battery, damaged belt or wiring problem can produce similar symptoms, so testing charging voltage is more useful than replacing the alternator on symptoms alone.
A sensible diagnosis normally includes battery condition, charging output, auxiliary belt condition and the main charging connections. This helps avoid replacing an alternator when the underlying problem is a battery, belt, fuse or wiring fault.
Put the quote into AutoAid and compare it with the relevant job benchmark and your regional labour rate.
Check my garage quoteSee all repair cost guides →Repair figures are indicative AutoAid UK reference ranges, not quotations. Exact vehicle specification, diagnosis, parts and local labour rates can change the final cost.