Best 7 Petrol SP Lawnmowers Under £350

Discover the best 7 petrol self-propelled lawnmowers under £350. A witty, practical guide to powerful machines that make mowing faster, easier, and far more enjoyable.

Why Choose a Self-Propelled Petrol Mower Under £350?

Because Your Lawn Should Be Cut Smoothly, Not Your Bank Account. If you have ever tried pushing a heavy mower up a slope and reconsidered all your life choices halfway up, it is time you met the marvel that is the self propelled petrol lawnmower. These machines power themselves forward so you do not have to, which means you save your energy for more important things, like enjoying a cup of tea afterwards or pretending you always intended to do the garden today. All seven models featured here were under £350 at the time of this review, making them powerful yet surprisingly accessible for many households.

Perfect for Slopes, Larger Lawns, and Busy Lives

Self-propelled mowers are great for when the garden gets bigger or the terrain stops co-operating. If your lawn has slopes, bumps, or ambitious ambitions to become a small hill, these mowers handle it with ease. Their drive systems do most of the heavy lifting so that you can glide rather than wrestle your way across the grass. Mowing becomes quicker, smoother, and much less of a workout, which means more time doing actual fun things with family rather than conquering the back garden like some kind of reluctant mountaineer.

Faster Mowing, Less Effort, More Satisfaction

But a good self-propelled mower turns mowing from a chore to something almost enjoyable. Almost. You still need to steer, but that is about it. The engines are stronger, the decks wider, and the finish cleaner. For anyone with a medium to large garden, these machines pay for themselves simply by cutting your mowing time. And while they cost more than basic push mowers, the models on this list prove that you can still get serious power and convenience without going over budget. Think of it as investing in a calmer weekend routine.

Best 7 Petrol Self Propelled Lawnmowers Under £350

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#1, Cobra M51SPC 20" Petrol SP Lawn Mower

If your lawn is on the larger side and your enthusiasm is on the smaller side, the Cobra M51SPC is the mower that politely says, I will take it from here. With its mighty 51 cm cutting width and beefy 173cc DG600 OHV engine, this is one of the most powerful machines on the list and ideal for anyone who wants serious performance without tipping over the £350 line. It's built for bigger spaces, longer grass, and anyone who quite frankly doesn't have the time or patience to keep emptying tiny grass bags every ten minutes.

The self-propelled drive makes mowing feel less like a workout and more like a casual, steady stroll. You just need to engage the drive and let it cruise forward, guiding it where you want. The 4 in 1 cutting system allows you to mulch, collect, rear discharge, and side discharge-so you can pick the best depending on the season or how wild the grass has gotten lately. The ten-stage height adjustment from 25 to 75 mm provides more precision than most mowers can at this price range.

The large, 60-litre grass collector is another strong point and is perfect for reducing time spent walking back and forth to the compost heap. Coming in at about 40 kg, it's much heavier than its smaller siblings, but the bulk carries over to stability and robust build quality. If you want a mower that feels powerful, capable, and ready for anything your garden throws at it, then the Cobra M51SPC is top-notch in its class below £350.

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#2, Mountfield SP41 SP Petrol Lawnmower

If you want self-propelled convenience without a self-inflicted dent in your bank account, the Mountfield SP41 is one of the best-value picks you will find. Among the very lowest-priced models on the entire list, it still offers reliability and ease of use for which Mountfield is known. This model is designed for small to medium-sized gardens up to about 250 m²; it delivers just the right amount of power for everyday mowing while keeping the whole experience light and manageable.

Powered by a 123cc ST120 Autochoke petrol engine, the SP41 starts easily and runs smoothly even when the grass gets a bit thicker. The 39 cm cutting width is not the largest but ideal for tighter spaces, narrow paths, and slightly awkward-shaped lawns on which the larger machines can feel clumsy. Self-propelled drive means you don't have to push uphill, instantly making mowing more pleasant for anyone whose garden refuses to stay flat.

Five cutting heights from 22 to 80 mm give you plenty of flexibility, and the rustproof polypropylene chassis keeps the mower lightweight and easy to manoeuvre at just over 21 kg. The 40 litre grass collector is simple to remove and empty - ideal for quick sessions or regular trims. Storage is hassle-free thanks to fold-down handles and the compact frame.

If you want a budget-friendly self-propelled mower from a reputable brand, offering solid performance and a genuinely enjoyable mowing experience, the Mountfield SP41 is a brilliant and very affordable choice.

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#3, Einhell Petrol 46cm SP Lawn Mower

If you like the idea of a mower with the swagger of a small tractor but without the registration fees, the Einhell 46cm Self-Propelled might be your new favourite garden companion. Built around a punchy 2.0 kW four stroke engine, this machine does not just cut grass, it asserts dominance. With an idle speed up to 2,900 rpm, it slices through lawn growth with the enthusiasm of a teenager discovering the gym.

The nine level cutting height range, from 25mm to 80mm, lets you choose anything from bowling green neat to meadow chic. Adjustment is centralised too, so you are no longer playing hide and seek with individual wheel levers. The 65 litre grass box is genuinely generous, ideal for anyone who prefers mowing sessions without stopping every few minutes for a tip run.

Although self-propelled, Einhell includes a disengageable rear wheel drive, meaning you can switch between power assistance and manual control. Handy on tricky terrain or when your lawn throws a few bumps and lumps your way. A folding handle keeps storage civilized, and with a recommended coverage of up to 1,400 square meters, this mower is built for bigger gardens that demand a bit more bite. You even get a three-year warranty once registered, always reassuring when investing in a hardworking garden machine.

All in all, this Einhell is a great blend of grunt, practicality, and durability. A big lawn workhorse at a budget-friendly price.

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#4, Hyundai 17"/42cm 139cc Electric-Start SP Lawnmower

If convenience had a mascot, then it would probably be this mower. Hyundai's 139cc self-propelled model brings you the rare luxury of electric start at a price point that normally forces you into the world of pull cords and prayer. Press the button, listen to it purr, and off you glide across the lawn with minimal fuss. For anyone who's wrestled a reluctant recoil starter at 8 am on a Saturday, this feature alone feels like a gift.

With rear wheel drive, you get steady traction on uneven or slightly sloped terrain. In other words, the mower does the legwork; you simply steer it, like a proud captain guiding a ship through choppy grass. It's built around a powder-coated steel deck-giving it that reassuring solidity you expect from Hyundai garden tools-and the overall build feels ready for regular, real-world mowing rather than just showroom admiration.

It suits medium to larger lawns where flexibility matters, thanks to its 42cm cutting width and six adjustable height settings ranging from 25mm to 75mm. Changing the cutting height is made easy by a single lever mechanism, and assembly is kept straightforward, so you can be mowing within minutes of unboxing. The 31kg weight may sound like quite a bit, but the self-propelled drive makes it glide surprisingly easily.

For anyone after a feature-packed petrol mower that will start without drama, handle uneven terrain, and feel like a solid long-term investment, this 42cm electric start model from Hyundai hits that sweet spot nicely.

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#5, Webb WER460SP 18"/46cm SP Petrol Lawnmower

If ever you've wished a mower would turn up like a take away, ready to go the moment the door closes, the Webb WER460SP gets very close. Straight out of the box and armed with its HP-100 starter kit, you get the fuel can, the oil, and even the funnel included. Webb essentially hands you everything but the cup of tea to go with your first mow.

Powered by a 141cc engine that is designed to keep vibration and noise down to polite levels, this self-propelled 46cm mower brings both convenience and capability. Seven cutting heights from 25mm to 75mm give you full seasonal flexibility, and the single lever adjustment means no crawling around the mower trying to decode which wheel does what. It's the difference between sensible design and relationship-testing frustration.

It's all about versatility here. Want to collect clippings? Done. Prefer to mulch in summer to feed the lawn? Easy. Need to discharge clippings to the side? Also available. The 55 litre mesh bag fills efficiently thanks to strong airflow, so emptying breaks are far less frequent than you might fear on a mower of this size.

A sturdy construction in steel and alloy means that it has that old school reassuring heft, but the self-drive helps it glide over uneven gardens without it becoming an arm workout. The fact that it's backed by a three-year guarantee and good UK aftercare means the Webb WER460SP feels like a proper long-term partner for a medium to large lawn.

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#6, ParkerBrand 17” SP Petrol Lawnmower

If mowing feels more like penance than gardening, the ParkerBrand 17 inch self drive mower might be the apology gift you never expected. This machine cuts down on lawn maintenance woes by replacing sweat and pushing with a robust 150cc engine and a self-propelled system that does all of the hard work for you.

It is a compact but capable unit with a 17-inch cutting width that suits small to medium-sized gardens perfectly. Fully adjustable cutting heights between 25mm and 75mm let you switch between tidy trim and lush summer growth with a quick lever movement. Despite being steel-decked and solidly built, the mower remains easy to steer around trees, borders, and those garden ornaments you keep promising to move.

The 45-liter grass bag does a respectable job for its size, reducing the number of mid-mow interruptions. If you would rather return nutrients back to the lawn, the mulching port gives you that option too, and it genuinely helps improve lawn health without chemical feed. One very thoughtful touch is the hose connector on the deck. Attach your garden hose, run the blades briefly, and it flushes the underside clean. This is the sort of detail that makes maintenance less of a chore and more of a quick tick-box task.

With its gutsy engine, self-drive convenience, steel construction, and low-fuss maintenance, the ParkerBrand brings straightforward value. It's one of those mowers that just gets on with the job and lets you finish quicker than expected, and that might explain why so many buyers quietly love it.

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#7, Scheppach MS173-51 Self-Propelled Petrol Lawnmower

If the idea of a mower with a bit of swagger appeals, then the Scheppach MS173-51 arrives like a well-built gym lad who also knows how to fold himself neatly into a cupboard. With a 173cc engine pushing out 4.1 HP, this machine doesn't just cut grass-it asserts dominance over it. High torque keeps the blade spinning through heavy patches with zero complaint, while the self-propulsion and ball-bearing wheels give it an almost gliding feel, even over lumpier lawns.

The generous 51cm cutting width suits gardens up to roughly 1,600 square metres, so if your lawn feels closer to a training pitch than a suburban patch, this one will feel right at home. Height adjustment runs from 25mm to 75mm through a central lever, making it easy to tune your cut depending on the season or how forgiving you are feeling toward the lawn that day.

It's this versatility that's a huge part of the appeal, offering rear ejection, side ejection, and mulching depending upon your lawn or your mood. The 65 litre bag is similarly welcome, reducing stops to a minimum on longer mowing laps. Add in Scheppach's low emission QE5 engine and you have a machine that's powerful without being unnecessarily thirsty or smoky.

An incorporated cleaning function has made maintenance reassuringly simple, and the foldaway handle means the whole thing stores away far more politely than you might expect for a mower of this size. Strong, muscular, and surprisingly practical, the MS173-51 is a brilliant all-rounder for anyone that wants big mower performance without the big mower faff.

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Conclusion

Choosing a petrol self-propelled mower for under £350 used to feel like picking the least painful option from a line-up of chores. Thankfully, times have changed. Every mower on this list proves you can get serious cutting power, quality features, and time-saving convenience without tipping over into premium pricing. Whether you want something lightweight for nipping around a smaller garden or a torquey beast that handles slopes and longer grass without breathing hard, the choices here cover every type of garden and gardener.

Real Benefits

The real benefit of going self propelled is simple: it gives you back time. Not only is mowing quicker, but it's more enjoyable, more consistent, and far less effort. You finish the job fresher, earlier, and with more daylight left to spend however you actually want-whether that's sitting with the family, tending to the flower beds, or escaping indoors with a cold drink and a smug smile.

Best Value Line Ups

At the time of reviewing, every option included came in under the £350 mark, which makes this group one of the best value line ups currently available. From compact bargains like the Mountfield SP41 through to big garden champions like the Scheppach MS173-51, there is no weak link in the seven.

Final Word

If you want a mower that feels like it's doing the heavy lifting for you, this list is where to start. Pick the one that matches your garden size and mowing style, fuel it up, and enjoy the simple joy of a machine that finally works as hard as you do.