How much does it cost to replace a car alternator in the UK?

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Price guide

£100 - £700







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Most, if not all, modern vehicles use alternators to supply continuous power when you drive. Damaged alternators require immediate attention, but choosing between repair and replacement isn't always easy. While there are alternator repair services if you're short on cash, sometimes the best option is to replace the component and save more in the long run.

Typical alternator replacement costs range from £100 to £700 for both parts and labour. The low end of the scale usually means you'll be getting a remanufactured alternator or one from an original equipment manufacturer. On the other hand, alternator replacement costs are higher when buying a brand-new product from your vehicle's original supplier.

Signs that an alternator needs replacement

There are a few things to look out for if there's an issue with your alternator. Unfortunately, these signs are similar to other car problems. Spotting them and getting your car checked immediately can prevent further damage and reduce your overall alternator replacement cost.

a mechanic installing a new alternator

1. Faulty or weak battery 

This is one of the more ambiguous signs. A dead battery could just mean that it's aged and requires a replacement. Also, starting issues could result from bad spark plugs. But if problems persist even after replacing your car batteries, the root cause might be your alternator. 

2. Stalling engine

In modern combustion engines, fuel injectors run electronically. A bad alternator can make your fuel injectors malfunction, resulting in a stalling engine. Though other issues can cause this problem, never rule out your alternator.

3. Unusual engine noises

Another ambiguous sign is if you hear unusual noises coming from your engine, like groaning, whining, or squealing. Because of the number of moving parts under the hood, the cause could be just about anything. So to be sure, have your engine checked immediately.

4. Burning smell under the hood

If you smell something burning, stop driving immediately and get help from a mobile auto electrician near you. The cause is usually electrical, so it could be the parts chafing inside your alternator or other car components. 

5. Flashing dashboard lights

One obvious sign is when dashboard lights, such as the check engine or battery light, start flashing. If your car's electronic control unit isn't receiving enough power, your alternator is probably malfunctioning. 

6. Failing electrical system

Since the alternator powers pretty much everything in your car, your electronics won't work properly once it starts to fail. If you're inconvenienced by randomly dimming headlights, inaccurate dashboard gauges, and slow power windows, it's high time to get a quote for car alternator replacement costs. 

Alternator replacement price list

Here's a quick table showing how much it costs to change an alternator

Vehicle brand

Alternator replacement cost


£343 to £628


£294 to £545


£346 to £656


£326 to £550


£335 to £664


£348 to £600

As you can see, car alternator costs in the UK depends on your vehicle's make. For an accurate estimate, have a professional check your car and provide you with an alternator replacement quote.

Factors affecting the cost of alternator replacement

a man holding a car alternator

Vehicle make and model 

As mentioned earlier, the price of alternator replacement will depend on the make and model of your vehicle. Expect higher alternator replacement costs for high-end car brands and models. Alternator replacement for mid-ranged or entry-level vehicles is much more affordable. 

Alternator type 

If you're like most people with stock or unmodified electronics, alternator replacement won't cost you more than it should. Because basic, stock alternators for a regular car will cost less than a high-output alternator. You'll only need a high-output alternator if you have a custom-built street car.


Where your alternator is under your hood affects the labour cost of replacing an alternator. Mechanics will charge less if your alternator is easier to reach because dismounting and replacing it is much easier. A hard-to-reach alternator will take more work because mechanics must remove other parts under the hood to access it. 

Post a task for alternator replacement

Overall, proper car maintenance is a long-term commitment that ensures you're safe every time you step behind the wheel. Once you start noticing issues with your alternator, log on to Airtasker to find a skilled mechanic and get a quote for your area's average cost to replace an alternator.

When posting a task, include all details your mechanic might need, such as the make and model of your vehicle. Once you start getting offers, be sure to choose a Tasker who fits your schedule and budget. 

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FAQs about alternator replacement

It’s generally better to replace the alternator altogether, but it will cost you a bit more upfront. Alternator repair services are available as long as parts are available and there’s little to no damage to the other parts of the alternator. Basically, repair is an option if you can’t afford a brand-new alternator at the moment. Consider getting a new one soon because a repaired alternator might not last long.

As long as your battery isn’t drained or due for replacement, you don’t need to get a new battery when replacing your alternator.

Mechanics usually take two to three hours to replace an alternator. This accounts only for the actual work done, so it’s best to factor in an extra hour or two for your mechanic to clean up, run some tests, and make last-minute adjustments.

Alternators usually last around seven to 10 years, depending on your driving habits and how often you drive your car. Additional electronics can affect the service life of your alternator.

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