In this guide
- Telescopic vs Sliding: Key Differences
- Space Requirements
- Side-by-Side Comparison
- Section count by opening width
- Ground track or cantilever?
- Which Should You Choose?
Buying telescopic gates? See the factory-direct telescopic gates range - opening widths, gate sections, drive options and a quote request in one place.
Table of Contents
How do telescopic and sliding differ?
Both telescopic gates and sliding gates open horizontally, but they solve space problems differently. A sliding gate is a single panel that slides to one side, requiring a clear parking length equal to the gate opening. A telescopic gate is made of two or more overlapping leaves that fold together, opening in a much shorter space—typically 1/3 of the opening width. The electric telescopic door series is built for sites where a full-length slide track is impossible.
Space Requirements
This is the deciding factor for most projects:
- Sliding gate — needs a parking zone at least as long as the opening (a 6m opening needs 6m+ of clear side space)
- Telescopic gate — needs only about one-third of the opening width (a 6m opening needs ~2m of side space)
If your entrance has walls, buildings, or other obstacles on one side, a telescopic gate is usually the only workable option.
How do they compare side by side?
| Feature | Telescopic Gate | Sliding Gate |
| Space needed | ~1/3 of opening | Full opening length |
| Opening speed | Faster (leaves move together) | Slower on long spans |
| Structure | Multi-leaf overlapping | Single panel |
| Best for | Factories, warehouses, tight sites | Driveways, estates, wide-open sides |
| Cost | Higher (more mechanics) | Lower for simple installs |
| Maintenance | More moving parts | Simpler, robust |
Telescopic gate specifications (factory data)
The figures below come from our own data sheet for the electric telescopic gate series, so they describe the product rather than a general rule of thumb. Configurations outside these ranges are quoted against the entrance drawing — opening width, section count and drive are confirmed in writing before the order. The sizing logic behind the numbers is explained in the electric telescopic door series.
| Opening width | Typically 6–25 m, depending on the number of sections |
| Gate sections (leaves) | 2, 3 or 4 telescopic sections |
| Opening height | Up to 2.5 m as standard; other heights on request |
| Drive | Motor-driven rack and pinion; chain drive on request |
| Power supply | 220 V / 380 V three-phase or 110 V / 220 V single-phase, model dependent |
| Opening speed | Typically 15–25 m per minute |
| Material | Hot-dip galvanised steel frame with powder-coated finish |
| Operating temperature | Typically −20 °C to +55 °C |
| Control and access | Remote control, card reader, face recognition, loop detector, LPR integration |
| Installation | Floor guide rail or track; foundation details are shown on the GA drawing |
These values come from our own telescopic gate data sheet. Project-specific deviations are confirmed in writing before the order — send us your entrance dimensions and we will confirm the section count, the drive and the foundation detail.
Telescopic gates: how many sections for your opening width?
Telescopic gates are specified by opening width first, because the width decides how many leaves the gate needs and how much side space is left once it is open. The table below applies the “about one-third of the opening” rule to the widths we build, and puts the same opening next to a sliding gate for comparison.
| Opening width | Telescopic sections (the range we build is 2, 3 or 4) | Side space when open (~1/3 of the opening) | Side space a sliding gate needs |
| 6–8 m | 2 leaves | approx. 2.0–2.7 m | 6–8 m clear |
| 9–14 m | 3 leaves | approx. 3.0–4.7 m | 9–14 m clear |
| 15–25 m | 4 leaves | approx. 5.0–8.3 m | 15–25 m clear |
Two more numbers settle the drive: opening height (up to 2.5 m as standard) and opening speed (typically 15–25 m per minute on the electric telescopic door series). The side-space figures follow the same one-third rule quoted at the top of this guide and the section counts are typical values — the final leaf count is confirmed against your entrance drawing, because gate post positions, ground slope and the clearance needed by delivery vehicles all change the layout. Send the opening width and the available side space and we will confirm the section count, the drive and the foundation detail.
Ground track or cantilever: the detail that decides the installation
Once the space question is settled, one more choice separates two very different telescopic gates — and it is decided from the paving, not from the catalogue. A tracked telescopic gate runs its panels on a floor rail or bottom track set into a level, drained foundation. A cantilevered (top-guided) telescopic gate carries the same panels on a top beam or a reinforced bottom frame instead, so no rail crosses the roadway.
| Site condition | Tracked telescopic gate (floor rail or bottom track) | Cantilevered / top-guided telescopic gate |
| Paving | Needs the running line to stay level and true | Tolerates a slope, a camber or paving that settles |
| Drainage | Must be drained — water standing in a rail reaches the running gear first | Nothing to trap water, grit, leaves or ice |
| What crosses the opening | Every vehicle, plough and gritter passes over the exposed rail | Preferred where trucks, snow ploughs or gritting equipment use the lane |
| Below-ground works | Foundation and drainage run under the rail | Fewer below-ground works |
| Build cost and complexity | Simpler structure, lower build cost | Heavier panel and beam design to carry the cantilever load |
| Best fit | Secure yards and industrial entrances with a settled, drained apron | Driveways, sloping frontages and shared roadways |
The layout is confirmed from the entrance drawing rather than from a stock list, so the three things to send are the clear opening, the usable stacking length and what crosses the opening in service — paving type, whether trucks or ploughs use it, and where surface water goes. On a sloping or poorly drained approach the cantilevered layout is normally the more durable specification, and it costs more up front for exactly that reason. The telescopic gate working guide covers the full opening cycle and the six items a quotation should contain, and the electric telescopic gate range lists the drive and section options we build.
What we build for the entrance
Perimeter gate or vehicle lane
Telescopic
Electric Telescopic Door
- Motor-driven telescopic sections, remote or access control
- Wide entrances from several metres to large factory gates
- Also built as automatic sliding gates
Vehicle lanes
Intelligent Barrier Gate
- Brushless DC and AC motor barrier gates
- Operating range -35 C to +75 C
- Straight arm up to 6 m, fence arm 5 m
Which Should You Choose?
Choose a telescopic gate when side space is limited (buildings, fences, loading docks), when you need the fastest opening for frequent traffic, or when the entrance is wider than 6m. Choose a sliding gate for residential driveways and sites where a full slide track is available—it's simpler, cheaper, and very reliable.
Both can be automated with remote controls, loop detectors, and access control integration from our access control system series.
Conclusion
Measure your side space first: if you can dedicate the full opening length to a slide track, a sliding gate offers the best value. If not, a telescopic gate is the space-saving answer. Share your entrance dimensions and we'll recommend the right configuration.