There is no verified test winner among the low-cost petrol lawnmowers covered here. For a small or medium, mostly flat lawn, a basic push mower is usually the cheaper, simpler choice; for a larger or sloping lawn, self-propelled drive can make mowing less strenuous. UK comparison listings put several candidates below £300, but their prices are snapshots—not proof of performance or current availability.
Cheap petrol lawnmowers to compare
The options below appeared in Which?’s UK petrol-mower comparison capped at £350, accessed on 8 October 2026. The prices are listings from that comparison and can change. Its public listing does not expose the full test scores, pros or cons, so it does not establish which mower cuts best.
| Model | Drive or listed feature | Price shown | What to check |
|---|---|---|---|
| Cobra M41C | Not stated in the comparison details cited here | £167.99 | Confirm drive type, cutting width, collection options and current price for the exact version. |
| Q Garden QG40-145SP | Self-propelled | £215 | Check the model-specific cutting and collection specifications, and whether its drive suits your lawn. |
| Webb WER410SP | Self-propelled | £220 | Do not confuse it with the Webb WER410HP, which is a push mower. |
| Webb WER460SP | Petrol; mulching listed | £259.95 | Check whether the mulching equipment is included with the exact version and seller. |
| Mountfield SP42 | Petrol; mulching listed | £269 | Confirm model year and included equipment before comparing offers. |
Model names, listed features and prices are from Which?’s petrol mower comparison. The source does not provide comparable cutting widths, collector capacities or full test results in the material available here, so those details should be checked against the exact model specification before buying.
Webb WER410HP: a push-mower search option
DIYFY names the Webb WER410HP as a 41 cm push rotary petrol mower and links to Amazon.co.uk. That identifies a model to compare, but does not establish its present Amazon price, stock, seller or independent test performance. Confirm the listing is for the WER410HP—not the self-propelled WER410SP—before ordering. The model reference comes from DIYFY’s budget petrol mower guide.
Do these 3 things before closing this tab:
1Clear out junk files and repair common Windows errors2Scan for outdated or missing drivers - takes under a minute3Repair Windows errors before they cause bigger problems#1 Best Overall
- Powerful 201cc OHV Engine-Powered by a reliable 201cc 4-cycle OHV engine, this lawn mower delivers strong, consistent performance and long-lasting durability, making it ideal for tackling medium to large lawns with ease.
- 22-Inch Wide Cutting Deck-Featuring a durable steel deck and sharp steel blade, the 22-inch cutting width covers more ground in less time than standard 20-inch mowers, helping you finish mowing faster and more efficiently.
- Self-Propelled with 11-Inch Rear Wheels-The rear-wheel-drive self-propelled system, paired with large 11-inch rear wheels, provides superior traction and smooth maneuverability, making it easier to handle slopes, uneven terrain, and thicker grass.
- Versatile 3-in-1 Cutting System-Easily switch between Bagging, Mulching, and Side Discharge modes to suit different mowing conditions and lawn care preferences for a cleaner, more efficient cut.
- 6-Position Single-Lever Height Adjustment-Quickly adjust the cutting height with a single lever. Choose from six height settings ranging from 1.25" to 4" to achieve the perfect cut for any season or grass type.
Choose by lawn, not by the lowest sticker price
Small or medium, mostly flat lawn
A push mower generally costs less and can suit a smaller or medium garden. You provide all the pushing effort, so consider the lawn’s shape, obstacles and how often you mow as well as its area. For a tight budget, compare a basic push model’s specifications and equipment with the listed price rather than assuming the cheapest listing is the best value.
Large or inclined lawn
Self-propelled drive helps reduce the effort of pushing and can be useful on a larger or sloping lawn. It does not remove the need to steer or manage the mower safely. Check the manufacturer’s manual for slope guidance and confirm that the drive system is appropriate for your terrain. Homebuilding & Renovating discusses the push-versus-self-propelled trade-off in its petrol mower guide.
Rank #2
- Reliable Engine: Experience high performance and longer working life with the 144cc 4-stroke OHV engine, engineered with a stabilized body structure for maximum durability.
- Easy Start System: Equipped with auto choke for easy start, and primer structure for better starting.
- 21“ Steel Deck: Featuring a 21" durable steel deck built to last through tough yard tasks, the specialized blade delivers finely mulched clippings and a clean, even cut every time.
- Effortless Maneuvering: Designed with 10" rear / 7" front double ball-bearing wheels for smooth control and easier pushing around your yard.
- 3-in-1 Mowing Function: Mulching, bagging, or side discharge. This versatile system lets you nourish your lawn with fine mulch, simplify cleanup with bagging, or power through tall grass with side discharge.
Clippings, starting and storage
- Clippings: Check whether the exact version collects, mulches or discharges grass. If mulching matters, confirm that the plug or other required equipment is included.
- Collector capacity: Compare capacities in each model’s own specification; the comparison listings cited above do not establish equivalent capacities. A larger collector may mean fewer interruptions, but can add weight when full.
- Starting: Which? says pull-start models can be lighter and less complex, while electric start reduces the physical effort of starting. Check whether the particular mower has electric start and whether it needs a separate battery.
- Storage: Check the mower’s dimensions and the manufacturer’s instructions for folding, cleaning and storage. Petrol equipment needs appropriate fuel storage and seasonal care.
What the available comparisons can—and cannot—tell you
Which? says it buys mowers for annual field tests, but the full results are restricted to members. Its public under-£350 comparison shows model names, selected features and prices, not the full evidence needed to declare a budget winner. Homebuilding & Renovating says it did not hands-on test the petrol mowers in its guide. Treat the shortlist as a starting point for model and price checks, not as a ranking based on comparable public test scores.
There is also a UK price context beyond the budget shortlist: Honda’s official UK store listed the Izy HRG 416 PK at £470 and the self-propelled HRG 416 SK at £630 when accessed on 8 October 2026. Those figures are catalogue listings, not budget recommendations or a like-for-like performance comparison. See Honda Power Products UK’s lawnmower catalogue.
The Tool Desk
Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →Rank #3
- ⚠️ NOTE: Battery and charger not included! ⚠️ The battery compartment has limited space and can accommodate a maximum of 2 x 4.0Ah batteries
- [PERFECT COMPATIBILITY & 40V POWER] This 40V cordless lawn mower is engineered to be compatible with Dewalt 20V MAX batteries (Requires 2 packs of 20V batteries to provide 40V power). Perfect for users looking to expand their battery powered lawn mower collection without extra costs. Deliver consistent, gas-like performance for your lawn care routine. [Note: Bare tool only]
- [14" WIDER CUT & 6-LEVEL HEIGHTS] Outperforming common 13-inch models, our 14 inch electric lawn mower covers a wider path to reduce mowing time. Features a single-lever 6-position height adjustment (from 0.98" to 3"), allowing you to customize this grass cutter for different grass types and seasonal growth in your garden or backyard
- [UPGRADED COPPER MOTOR & STEEL BLADE] Equipped with a high-torque upgraded copper motor and premium manganese steel blades, this electric mower cordless delivers sharp, clean cuts even in dense grass. The ultra-quiet operation makes it an ideal quiet lawn mower that won't disturb your neighbors during early morning yard work
- [35L LARGE CAPACITY & LIGHTWEIGHT] This walk-behind lawn mower features a 35L (9.25 Gallon) grass collection bag to minimize interruptions. Weighing only 22 lbs, its ultralight design ensures effortless maneuverability around flower beds and trees, making it the perfect small lawn mower for seniors and homeowners with small to medium yards
Petrol, fuel and local restrictions
Check the manual before filling or storing fuel
Which? says E10 can be used in lawnmowers and prefers E5; it notes that ethanol attracts water and fuel left for an extended period can go stale. Follow the exact engine’s owner’s manual for approved fuel and storage procedure. Which? advises either running the mower until fuel is used at season’s end or using a fuel stabiliser; do not assume that approach overrides the manual. Its 2026 petrol mower guide also covers fuel and seasonal care.
Check local rules and the trade-off against cordless
Which?’s 2026 guide says there is no UK-wide regulation banning petrol-powered gardening tools, but local councils may impose noise or air-pollution restrictions. Check requirements for your own area. Petrol can suit larger lawns where extended running time and power are priorities, but petrol tools have environmental and health drawbacks; cordless alternatives are quieter and produce no emissions during operation, according to Which?. The sources cited here do not provide a comparable emissions figure or lifetime-cost analysis, so neither environmental impact nor total ownership cost can be quantified from them.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
