Comparison · Automation
Underground vs above-ground gate motors
Underground motors hide the automation entirely — the right choice for ornamental iron and heritage entrances — but cost £1,500–£2,500 more installed and demand proper drainage. Above-ground rams and arms cost less, service more easily and suit most standard pairs. Choose underground for aesthetics-critical gates; rams for everything else.
The comparison that matters
| Factor | Underground | Above-ground (ram / arm) |
|---|---|---|
| Visibility | None — foundation box under each hinge | Ram or arm visible on the leaf's inner face |
| Installed cost (pair) | £4,500 – £6,500 | £2,800 – £4,500 |
| Groundworks | Excavation, concrete boxes, drainage runs | Bracket fixings only |
| Drainage sensitivity | Critical — flooded boxes kill motors | None |
| Service access | Lid-off, motor lift-out | Immediate |
| Opening angle | Up to 180° with some models | Typically ~110–120° |
| Suits | Ornamental iron, heritage, estate entrances | Standard pairs, retrofits, budget-conscious |
| Retrofit disruption | Excavation at hinges, making good | Minimal — a day's fitting |
The drainage paragraph every underground quote should contain
Underground motors live in steel foundation boxes at the lowest point of your entrance — exactly where water goes. On Surrey clay, which drains slowly, an underground installation without engineered drainage is a motor replacement on a timer. A proper specification names it: sealed boxes, drainage spurs to a soakaway or land drain, and a maintenance check of the boxes at every service. If a quote for underground automation doesn't mention drainage, the installer either doesn't know or hopes you don't.
Quick selection logic
- Bespoke ironwork where nothing may show → underground, budget the premium, insist on drainage detail.
- Heavy leaves + high duty + visible kit acceptable → hydraulic rams: underground longevity money spent on force instead.
- Wide piers where a ram can't reach geometry → articulated arm.
- Everything else → quality 24V linear rams; the sensible default that most entrances should choose without regret.
Free site survey & fixed quotation
Get a precise price for the right automation
Tell us the opening width, whether power is nearby and the style you have in mind. We measure on site, confirm a fixed price in writing, and never sell door-to-door.
Prefer to talk? Call 01483 000 000.
Frequently asked questions
Do underground gate motors flood?
They can if drainage is skipped — the number-one cause of underground motor failure we see. Correctly drained boxes with serviced seals run for 10–15 years happily.
Can underground motors be retrofitted to existing gates?
Yes, with excavation at each hinge point and usually a hinge conversion to the motor's pivot. It's the most disruptive retrofit — a two-to-three-day job priced on the automation cost page.
Are rams unreliable compared to underground motors?
No — quality 24V rams are arguably the most proven format in residential automation. The choice is aesthetic and geometric, not a reliability ranking.