Choosing a robot mower isn’t as complicated as some guides make it seem, but it does require asking the right questions. The best machine for a flat quarter-acre in a Sheffield suburb is very different from the best machine for a sloping rural garden in the Dearne Valley. Here’s a practical framework for working it out.
Step 1: Measure your lawn
Robot mowers are rated by maximum coverage area. If you don’t know your lawn size, it’s worth measuring it, or at least estimating it. A standard detached house garden in South Yorkshire is typically 200–500m². Larger properties might be 1000–3000m² or more.
As a rough guide, once you know your lawn size, add 20% buffer when selecting a model. A mower rated to exactly your lawn size will be running at capacity, giving yourself headroom means it runs shorter cycles, charges less frequently, and lasts longer.
Step 2: Consider your gradient
Slope matters more than most people realise. If you have any meaningful incline, check the gradient rating of the models you’re considering. Most entry-level robot mowers handle slopes up to 25–35%. The STIHL iMow range handles up to 40%, and the EGO AURA handles up to 50%.
If you’re unsure what percentage your slope is, don’t worry, a site assessment will assess this properly and factor it into our recommendation.
Step 3: Think about complexity
How many separate lawn areas do you have? Are there narrow passages the mower needs to navigate through? How many obstacles, trees, flower beds, ponds, need to be excluded? More complexity generally means a more capable (and more expensive) model, and it means installation takes longer.
GPS-guided models handle multi-zone complexity particularly well, since you can define zones virtually rather than running separate boundary wire loops.
Step 4: Wire or wire-free?
Traditional boundary wire systems are reliable, well-proven, and appropriate for most gardens. If you don’t want any groundwork, or you have a garden where running wire would be impractical, GPS-guided models (Husqvarna NERA, EGO AURA) are worth the additional investment.
Wire-free models also make it easier to change your mowing zones if you redesign the garden in future.
Step 5: Budget
Entry-level models with professional installation start from around £1,100–£1,300 all-in. Mid-range models with installation typically land between £1,800–£2,800. GPS-guided and large-area models are £3,000–£5,000+ depending on coverage requirements.
The best way to get an accurate figure is to book a site assessment, we’ll provide a full written quote for supply and installation at no cost or obligation.
Still not sure? Call us on 0114 258 3855 or book a free site visit and we’ll work through it with you.