Compare Mobile Alternator Replacement Prices Near You

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These are just some of the reasons to choose a mobile mechanic through BookMyGarage, so enter your reg and postcode to compare mobile mechanics near you and have your new alternator fitted at home or work. We’re here to make things simple and stress-free, so you can book with confidence and look forward to the results.

How Much Does a Mobile Alternator Replacement Cost?

A mobile alternator replacement typically costs between £170 and £600, depending on your car and the type of unit it needs.

A reconditioned alternator sits at the lower end of that range, while a brand new unit costs more. How easy the alternator is to reach on your engine affects the labour time, and cars with smart charging or stop-start systems tend to cost more because the new alternator may need coding to the car once it’s fitted.

Typical UK costs based on published industry estimates as of 20th October 2026. Prices are representative figures only as costs vary depending on your make and model, the parts used and your chosen mobile mechanic. Enter your reg and postcode to compare options from local mobile mechanics for your exact car.

Can a Mobile Mechanic Replace My Alternator if My Car Won't Start?

Yes, and it’s one of the main reasons drivers choose a mobile alternator replacement. A failing alternator stops charging the battery, so the first sign is often a flat battery and a car that won’t start. With a mobile mechanic, there’s no need to arrange a jump start or a tow just to get the car to a garage.

Your mobile mechanic will test the battery and charging system before replacing anything, so you won’t pay for a new alternator if the battery is the real problem. Poor electrical connections can cause similar symptoms too, and your mechanic can check these at the same time.

On most cars the alternator can be replaced on your driveway or at work, and your mechanic will let you know if your car needs anything different.

Should I Replace Anything Else at the Same Time?

Only if it needs it, but your battery and auxiliary belt are both worth checking. A failing alternator can leave your battery repeatedly flat, which can damage it, and a weak battery makes a new alternator work harder than it should.

Your mobile mechanic can test the battery while they’re with you. If it’s no longer holding a charge, they can replace your battery in the same visit, so you won’t need a second appointment.

The alternator is driven by the auxiliary belt, which has to come off during the job. If it’s worn or cracked, replacing it at the same time only adds a little to the bill and saves paying for the same labour twice.

How Long Does a Mobile Alternator Replacement Take?

Anywhere from under an hour to a couple of hours on most cars. It depends mainly on how easy the alternator is to reach, as some cars need other parts removing first, and on whether the new unit needs coding to the car.

Warning Signs to Look For

Common signs that your alternator may be failing are:

• The battery warning light coming on while you’re driving

• Headlights or interior lights that dim or flicker

• Electrical problems, such as slow electric windows or the radio or air con cutting out

• A whining, grinding or squealing noise from the engine bay

• A battery that keeps going flat, or a car that struggles to start

• A burning rubber or electrical smell, in more serious cases

Many of these symptoms can also point to a tired battery, so it’s worth reading up on whether your alternator or battery is to blame. Either way, your mobile mechanic will check both before recommending a repair.

If you notice any of these warning signs, enter your reg and postcode to compare mobile mechanics in your area, all in under 60 seconds.