Underground Vs Above Ground Gate Motors

Choosing The Right Motor Type For Your Electric Gates

When planning electric gate installation, one crucial decision is choosing between underground or above ground motors. Both options have distinct advantages and drawbacks affecting cost, aesthetics, functionality and maintenance requirements.

Property type, budget constraints and design preferences determine which motor type serves you best. At Assured Gate Services, we've installed both motor types across projects throughout Nottingham and the East Midlands. This comparison will help you evaluate which electric gate solution works best.

What Are Underground Gate Motors?

Underground gate motors are positioned beneath your driveway surface in specially designed foundation boxes. These units connect directly to gates through hinge mechanisms, with only small access lids visible at ground level. Motor housings sit completely below ground level within waterproof foundation boxes requiring careful drainage. 

Connection occurs through lever systems attaching to specially welded 'shoes' on each gate leaf's underside. These motors move gates up to 3.5 metres wide weighing up to 600 kilograms per leaf. Underground positioning allows opening angles of up to 180 degrees or more. Installation requires significant excavation work, typically digging 500mm deep and creating adequate drainage systems.

What Are Above Ground Gate Motors?

Above ground gate motors mount directly onto gate posts with visible mechanical arms connecting to each gate leaf. These systems come in two main types: ram arms (straight linear actuators) and articulated arms (jointed arms that bend around obstacles).

Ram arms provide the cleanest aesthetic, extending and retracting in straight lines. However, they require specific geometric conditions including gates hung to post backs. Articulated arms offer greater versatility, using hinged designs allowing them to accommodate different hinge positions. 

Above ground motors are generally easier to install, requiring minimal excavation and no complex drainage considerations.

Design Considerations

Underground motors excel in maintaining clean, unobstructed gate aesthetics. With only small access lids visible at ground level, automation components remain virtually invisible.

This invisibility proves particularly valuable for period properties, conservation areas, or high-end installations where architectural integrity matters. Ornate gates showcase their design without mechanical intrusion.

Above ground motors add visible mechanical elements. Ram arms mount discreetly to gate backs, less noticeable from street side. Modern above ground motors feature sleek designs and powder-coated finishes complementing contemporary styles.

Installation Complexity

Installation requirements differ dramatically. Underground motor installation requires extensive preparation including excavation of foundation boxes, drainage system installation, and gate modification to accept underground connections.

Proper drainage becomes critical, usually requiring soak-away systems. Gate modification involves welding special connecting 'shoes' to each gate leaf's underside, requiring temporary gate removal.

Above ground motor installation proves considerably easier. Most installations require only basic mounting points on existing posts, with minimal excavation for power cables. Professional teams complete above ground installations in single days, compared to several days for underground systems.

Performance & Maintenance

Both motor types provide excellent operational performance. Underground motors typically operate more quietly due to enclosed positioning and direct mechanical connection. Direct connection provides powerful leverage for smooth, controlled movement of heavy gates.

Above ground motors vary depending on type. Ram arms provide smooth, quiet operation with strong forces. Articulated arms operate with slightly more complexity due to jointed design.

Maintenance requirements also present significant differences. Underground motors can be challenging to service due to their buried location. Drainage issues represent primary long-term concerns, as water accumulation reduces component lifespan.

Above ground motors offer superior accessibility. All components remain visible and easily accessible for quick inspections and replacement. However, they face greater weather exposure and potential vandalism.

Cost Analysis

Initial costs favour above ground motors. The motors are typically less expensive, and installation costs remain significantly lower due to reduced excavation and labour requirements.

Underground motor installation includes higher-priced motors plus significant expenses for excavation, drainage installation and gate modification. These costs can easily double project expense compared to above ground alternatives.

Long-term value considerations may favour underground systems for properties where aesthetics significantly impact value.

Frequently Asked Questions

Can Underground Motors Be Retrofitted To Existing Gates?

Yes, but retrofitting requires gate removal, welding modifications and extensive excavation. This makes above ground motors typically more practical for existing automation.

Which Motor Type Is More Reliable?

Both offer excellent reliability when properly installed and maintained. Underground motors benefit from weather protection but face drainage issues. Above ground motors have easier maintenance but greater weather exposure.

Which Provides Better Security?

Underground motors offer superior security through invisibility and tamper resistance. Above ground motors are more vulnerable but may provide visual deterrent value.

Making Your Decision

Your choice should consider budget constraints, design requirements, installation circumstances, and maintenance needs. New builds accommodate underground motors more easily, whilst retrofits typically favour above ground solutions.

Assured Gate Services specialises in both motor types, providing honest advice based on your property's unique requirements. Our site surveys evaluate ground conditions, power supply and design preferences. Contact Assured Gate Services to discuss your electric gate requirements.