Best Robot Mower for a 500m² Garden UK
Last updated: 2026-07-04 · Prices checked against UK retailers on this date
500m² sits on an awkward boundary: it's the exact rating of several popular mowers, which makes them tempting and wrong. The rule from our 300m² guide applies with more force here — buy above your size.
Quick answer
Value pick: Navimow i108E, £549 promo (~800m² rated). Easiest setup: Eufy E15, £1,499 (800m², flat lawns). Trees over the lawn: Navimow i208E, £1,099 RRP.
[AFFILIATE LINK: Navimow UK – i108E]Affiliate link placeholder500m² shortlist
| Model | Price* | Rated | Verdict at 500m² |
|---|---|---|---|
| Navimow i108E | £549 promo | ~800m² verify | Best value with real headroom |
| Eufy E15 | £1,499 | 800m² | Best if flat/even + setup simplicity matters |
| Navimow i208E | £1,099 RRP | verify | LiDAR pick near trees |
| Navimow i105E | £699 | 500m² | At its limit — only for simple, open 500m² lawns |
| Gardena Sileno Life 750 (wired) | price TBC | 750m² | Quiet wired alternative, mows in rain |
*Checked July 2026.
Value pick: Navimow i108E
At its £549 promo price (£649 list) with a coverage rating well above 500m² rating verification pending, the i108E is the rare case where the bigger mower is also the cheaper one. Same RTK + vision platform as the rest of the i-series.
The Eufy E15 case
800m² rating, no-antenna 15-minute setup, superb obstacle avoidance. The caveats from our E15 comparison stand: flat, even lawns only — at 500m² your lawn probably has more character than the E15's wheels enjoy, so be honest about your terrain.
Why wire-free wins at this size
A 500m² lawn implies ~90–120m of perimeter plus islands. Wired, that's a weekend of pinning wire (or an installer's fee — see installation costs). Wire-free, it's under an hour with your phone. The bigger the lawn, the bigger the wire tax.
What to avoid
- Any mower rated exactly 500m² unless your lawn is a simple open rectangle.
- Ignoring zones: if your 500m² splits front/back, confirm multi-zone support and transfer routes.
Run your numbers in the selector → · Related: Large gardens · Navimow vs Mammotion
Verification notes: i108E/i208E ratings and Sileno Life 750 price pending verification.
FAQs
Can the Navimow i105E handle a 500m² lawn?
It's rated exactly 500m², so technically yes — but it would mow at full stretch every day with no slack for weather, growth spurts or complex shapes. At 500m² we recommend stepping up to a higher-rated model like the i108E.
What's the cheapest robot mower for 500m²?
With proper headroom, the Navimow i108E at £549 promo (~800m² rated, verify) is the value leader as of July 2026. Wired, the Gardena Sileno Life 750 covers 750m² — price pending our verification.
Should a 500m² garden go wired or wire-free?
At this size wire-free earns its premium: 500m² means roughly 90–120m of perimeter wire to bury, plus islands around beds and trees — a full weekend or an installer's invoice. The app walk-round takes under an hour.
How we compare products
- UK-first: only models actually sold in the UK, priced in pounds.
- No invented claims: specs come from manufacturer data sheets; hands-on findings are credited to the reviewers who tested them.
- Placeholders marked: if we haven't verified a price or spec yet, we say so rather than guess.
- Use case beats hype: we recommend by garden size, slope and budget — not by commission rate.