This machine is eligible for "white glove" delivery to large parts of northern England, fulfilled by one of our 14 depots. See list of eligible postcodes.
Allett Kensington 20H Lawnmower
Your price
£2,650.00
RRP
Allett
|
KENSINGTON 20H
In Stock
In Stock
Available to Order
Out of Stock
Every machine we supply is professionally assembled by one of our trained technicians before dispatch.
Every machine undergoes a thorough pre-delivery inspection which ensures your new machine is operating correctly, safely and is ready to use.
When we handover your new machine we will give you some instruction on the correct and safe use of your purchase. We will answer any questions you might have and also offer some instruction on basic maintenance to help you keep your new machine in good condition.
Product Accessories
In just a few minutes you can turn your mower into a powered lawn rake with a QC Scarifier Cartridge.
This spring tine scarifier gently removes moss and thatch. The raking action also disturbs coarse grass and creeping weeds.
As a general guide, and depending on the prevailing conditions, you would use a spring tine scarifier in April and June.
In Stock
£275.00RRP
£289.00
Improve the clip rate of your Allett Kensington cylinder mower by replacing the standard 6 blade cylinder cartridge with a 10 blade cartridge.
More blades means more cuts per metre for a finer cut.
In Stock
£569.00RRP
£597.00
In just a few minutes you can turn your mower into a powered aerator with a QC Aerator Cartridge.
The Allett QC Aerator uses a series of two pronged slitting tines to aerate your lawn. The slits created by the aerator allow vital air and water to reach the grass roots. The slitting action has the added benefit of pruning the grass roots causing vigorous growth.
As a general guide, and depending on the prevailing conditions, you would use an aerator from March to November.
Available to Order
£255.00RRP
£269.00
In just a few minutes you can turn your mower into a powered lawn brush with a QC Lawn Brush Cartridge.
The Allett QC Lawn Brush lets you turn your mower into a powered brush for clearing worm casts, leaves and other debris from your lawn. The brush is also useful for working in top dressing.
As a general guide, and depending on the prevailing conditions, you would use a lawn brush in January, February, March, May, June, August, October and November.
In Stock
£285.00RRP
£298.00
In just a few minutes you can turn your mower into a powered dethatcher with a QC Dethatcher Cartridge.
The Allett QC Dethatcher uses a series of widely spaced hooked blades to give an aggressive scarification to your lawn in early and late season. The tines penetrate the soil to a maximum of 6mm to remove the densest layers of thatch.
As a general guide, and depending on the prevailing conditions, you would use a dethatcher in February or March and September or October.
Available to Order
£315.00RRP
£329.00
In just a few minutes you can turn your mower into a verticutter with a QC Verticutter Cartridge.
The Allett QC Verticutter uses a series of closely spaced blades for “vertical mowing”. The verticutter blades stand up the blades of grass and remove lateral growth and moss. When used regularly the verticutter will encourage a denser and more regimented sward.
As a general guide, and depending on the prevailing conditions, you would use a verticutter from April to October.
In Stock
£435.00RRP
£459.00
Store up to three Allett QC cartridges with this floor or wall mounted stand.
In Stock
£145.00RRP
£149.00
Product Details & Features
- Cordless mower - 6 blades
- 20"/51cm cutting width
- 6-32mm cutting heights
- Petrol Honda engine
- Self-propelled
- Up to 2-year warranty
- Interchangeable cartridge system
The Allett Kensington 20H Lawnmower is a high-quality petrol cylinder lawn mower engineered to deliver smooth, precise cutting performance on small to medium residential lawns. Combining reliable petrol power with Allett’s renowned cylinder cutting action, the Kensington 20H helps you achieve a beautifully manicured finish with enhanced turf health and classic striping — making it ideal for garden enthusiasts, homeowners and grounds maintenance users.
Built around a 20-inch (51 cm) precision cutting cylinder, this mower uses precision-ground blades that work in harmony with the bed-knife to shear grass cleanly and consistently. The result is a refined finish with reduced tearing, promoting denser, healthier regrowth and an attractive appearance. Its robust design includes a rear roller for improved tracking and stripe definition, while the adjustable cutting height provides versatility to suit seasonal conditions and grass types.
Key Features:
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20″ Precision Cutting Cylinder – Offers smooth, even, professional-style grass cutting
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Powerful Petrol Engine – Provides dependable performance without the need for cables or charging
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Adjustable Cutting Heights – Lets you tailor grass length to suit conditions and preferences
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Rear Roller System – Enhances stability and helps produce classic striped lawn effects
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Balanced & Maneuverable Design – Easy to push and control around garden edges and borders
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Durable, Quality Construction – Built to Allett’s exacting standards for long-lasting reliability
Ideal For:
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Small to medium residential lawns
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Gardeners and homeowners seeking a neat, professional finish
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Ornamental turf care and formal lawn maintenance
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Users who want petrol-powered precision mowing
Product Details:
Product Type: Petrol Cylinder Lawn Mower
Cutting Width: 20″ / 51 cm
Engine: High-quality petrol engine
Cutting Height Adjustment: Multiple height settings
Roller: Rear roller included for enhanced stability and striping
Deck Material: Durable steel construction
Drive: Manual push operation
Why Choose the Allett Kensington 20H Lawnmower:
With a six bladed cylinder as standard, the Allett Kensington 20H will give a precision cut to your lawn. Powered by a Honda engine and with a 20” (51cm) width of cut, this mower is at home on large lawns.
The height of cut is adjusted by a single point infinitely variable micro-set height of cut control and an adjustable front rake helps to lift lateral growth for an improved cut.
A zinc plated front roller and steel rear roller will ensure that you achieve that classic striped finish to your lawn.
The Kensington 20H features a split rear roller for maximum maneuverability. A foam-cushioned handle and large throttle control make this top quality mower even more refined.
Allett have fitted this mower with their Quick Cartridge (QC) system that allows the cylinder unit to be removed quickly for ease of maintenance. The cylinder cartridge can be replaced with a range of other cartridges to turn your mower into a complete lawn care system. Choose from an aerator, lawn brush, dethatcher, verticutter and lawn rake. The standard six blade cylinder cartridge can also be replaced with a ten blade cartridge for an even finer cut.
The mower's handles feature a three-position height adjustment and will fold for storage. When it comes to storing the cartridges, Allett have produced a stand to hold three cartridges. The stand can be wall or floor mounted.
Quick Cartridge
The Quick Cartridge (QC) system allows your Allett Kensington to perform a range of lawncare tasks. The optional cartridges can be fitted quickly and easily in place of the cutting cylinder.
Product Specifications
| Manufacturer | Allett |
| Model | Kensington 20H |
| Category | Petrol |
| Type | Cylinder |
| Propulsion | Self Propelled |
| Rear Roller | Yes |
| Auto Engine Stop | No |
| Key Start | No |
| Grass Collector | Yes - 70 litres |
| Cutting Width | 20"/51cm |
| Cutting Heights | 6-32mm |
| Engine | Honda |
| Lawn Size | Large |
| Weight | 57kg |
| Machine Warranty | 2 years in domestic use |
| Engine Warranty | 2 years in domestic use |
We’ll take care of you
Pre-Delivery Inspection
All machines undergo a professional assembly and rigorous testing before we dispatch.
Free White Glove Delivery
All machines qualify for free delivery to the local area around our branches. Spare parts are delivered nationally.
Click & Collect
Place your order online and collect for free from our branches across northern England.
Official Dealer
We're official dealers of all the machines we sell, meaning we're qualified to give you the best aftersales support.