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Petrol Rotary Self Propelled Lawnmowers

Our 4 wheel petrol self-propelled lawnmowers take the effort out of mowing larger or sloped lawns, with the engine driving the wheels so you just guide the machine. Choose from Cobra, Masport, Harry, and Webb self-propelled petrol mowers, with cutting widths from 40cm up to 52cm and models suited to lawns from around 250m² up to 1200m². Many feature 4-in-1 functionality (collect, mulch, discharge, and side-discharge) and variable speed drive, giving you control over pace and finish across different areas of the garden. All orders come with free UK delivery, our 90-day money-back guarantee and price match promise.

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    Save 11%

    Cobra M40SPCVX Self Propelled 16″ Lawnmower

    Original price was: £259.00.Current price is: £229.99.

    Save 8%

    Cobra M46SPCVX Self Propelled 18″ Lawnmower

    Original price was: £305.99.Current price is: £279.99.

    Save 4%

    Cobra M48SPH Pro BBC Self-propelled Petrol Mower

    Original price was: £1,179.00.Current price is: £1,130.00.

    Save 9%

    Cobra M51SPCVX Self Propelled 20″ Lawnmower

    Original price was: £382.99.Current price is: £349.99.

    Cobra MX460SPC 4in1 Self-Propelled Petrol Mower

    £289.99

    Save 12%

    Cobra MX460SPH 18″ Honda GCVX145 Petrol Engine Self-Propelled Lawnmower

    Original price was: £429.99.Current price is: £379.99.

    Cobra MX460SPH Self-Propelled Petrol Lawn Mower

    £379.99

    Cobra MX484SPCE 48cm Self-Propelled Electric Start Lawn Mower

    £359.99

    Cobra MX534SPCE 52cm 4-IN-1 Petrol Lawnmower

    £399.99

    Cobra MX534SPH Self-Propelled 4 Speed Mower (Honda Engine)

    £469.99

    HARRY LMG42S-B

    £229.00

    Save 17%

    HARRY LMG46S-B 18″ Single-Speed Self-Propelled Petrol Mower

    Original price was: £328.99.Current price is: £274.00.

    Save 15%

    Harry LMG53SHL-C 52cm / 21″ Self-Propelled Petrol Mower

    Original price was: £429.00.Current price is: £365.00.

    Save 17%

    HARRY LMG53SHL-T

    Original price was: £430.99.Current price is: £359.00.

    Save 17%

    Masport 150ST SP Combi Petrol Rotary Lawn mower

    Original price was: £430.99.Current price is: £359.00.

    Save 17%

    Masport 150ST SP L Combo Self-propelled Petrol Lawnmower

    Original price was: £390.99.Current price is: £325.00.

    Save 10%

    Masport 250ST Combo SP Petrol Lawn mower

    Original price was: £459.00.Current price is: £415.00.

    Save 10%

    Masport 250ST SP L Combo Self-propelled Petrol Lawnmower

    Original price was: £409.00.Current price is: £369.00.

    Save 10%

    Masport 350ST SP Combo HLS 18 inch Petrol Lawn mower

    Original price was: £519.00.Current price is: £469.00.

    Save 10%

    Masport 450 ST SP Self Propelled Rotary Mower

    Original price was: £639.00.Current price is: £575.00.

    Save 10%

    Masport 575 AL SP Instart Self Propelled Rotary Lawn Mower

    Original price was: £899.00.Current price is: £809.00.

    Save 10%

    Masport 575 AL SP Self Propelled Rotary Lawn Mower

    Original price was: £759.00.Current price is: £685.00.

    Masport 800 AL Combo Self Propelled Petrol Lawn mower

    £739.00

    Save 10%

    Masport 800 ST SP L Self Propelled Mower

    Original price was: £619.00.Current price is: £559.00.

    Frequently Asked Questions

    How does a self-propelled petrol lawnmower work?

    The engine drives the rear or all four wheels, pulling the mower forward so you only need to steer and control the pace, rather than push the full weight of the machine. This makes mowing significantly less tiring on larger lawns or uneven ground.

    Do I need a self-propelled mower for a sloped garden?

    Yes, generally — self-propulsion makes a real difference on slopes, as you're not fighting the mower's weight uphill. Look for models with variable speed drive so you can slow down on inclines and speed up on flatter areas.

    What does 4-in-1 mean on a self-propelled lawnmower?

    A 4-in-1 mower can collect grass in the box, mulch clippings back into the lawn, discharge them out the back, or side-discharge, letting you switch cutting mode depending on grass length and season without buying separate attachments.

    Is a self-propelled petrol mower harder to maintain than a push mower?

    Self-propelled models have a drive belt and transmission system in addition to the standard engine maintenance, so there's slightly more to check over time. Routine care — oil changes, air filter cleaning, and blade sharpening — is otherwise the same as any petrol mower.

    What size lawn needs a self-propelled petrol mower?

    As a guide, self-propulsion becomes genuinely useful from around 500m² upwards, and is close to essential above 800m²-1000m², where the reduced physical effort makes a noticeable difference to mowing time and comfort.

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    Our Promise

    90 day guarantee

    Changed your mind? Just let us know within 90 days—as long as the item’s unused, in original packaging, and you have your order or invoice number, we’ll sort it. Email us to arrange the return. Once we’ve received and checked the item, we’ll refund you to your original payment method.

    Price match promise

    At Mowers‑Online, we want you to get the best deal. If you spot the exact same product for less elsewhere, just email us the details—and we’ll match the price. It’s simple, fair, and designed to save you money.

    Finance available

    Changed your mind? Just let us know within 90 days—as long as the item’s unused, in original packaging, and you have your order or invoice number, we’ll sort it. Email us to arrange the return. Once we’ve received and checked the item, we’ll refund you to your original payment method.
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