How to Install a Glass Floor Hatch | Installation Guide

Glass floor hatches and cellar doors are supplied as complete, finished units — the glass panel, frame, and mechanism arrive ready to drop into your opening. The installation itself is straightforward for any competent builder or joiner, though a few things are worth understanding before you start.

This guide covers the typical installation process for a hinged glass cellar door or hatch. Walk-on glass floor panels follow a similar process; if you're installing panels into a steel or timber floor structure, get in touch and we can talk through the specifics.

Delivery and safe handling

Glass floor hatches are heavy, precision-engineered units. Safe handling from the moment of delivery is essential to protect both the product and the people installing it.

• Two-person minimum: Installation must be carried out by at least two competent tradespersons. Do not attempt to manoeuvre or position the unit alone.
• PPE required: Wear appropriate personal protective equipment throughout — safety gloves, steel-capped footwear, and hard hats where there is any risk of overhead hazard.
• Check on delivery: Inspect the packaging carefully as soon as the unit arrives. Any damage must be reported in writing to the carrier, with photographs taken before accepting the delivery. Do not sign as received in good condition if damage is visible.
• Opening the packaging: Do not use a Stanley knife or similar blade to cut the packaging — this risks scratching the glass surface or paintwork on the steel frame. Use scissors or a purpose-made box cutter where necessary.
• Storage: If the unit cannot be installed immediately, store it inside in dry conditions. Moisture causes oxidisation on the steel frame components. Avoid leaning the unit against walls for extended periods.
• Orientation during manoeuvring: Do not tilt the unit more than 45 degrees from horizontal at any time. Never turn the unit upside down. The glass and mechanism are designed to operate in one orientation only.

Before you start

Check your structural opening

The opening in your floor needs to be accurately sized and structurally sound before the unit arrives. The frame sits into the opening and is fixed to the surrounding floor structure, so the opening must be the right size and the edges must be solid — not crumbling or loose. We'll confirm the exact frame dimensions with you when your order is placed.

Critically, all fixing surfaces must be flat, perfectly level, and free of dirt and debris. If the surface is not level, the outer frame will lift at one corner when fixed, creating an uneven bearing surface and — more importantly — a trip hazard at floor level. Do not proceed if the surrounding floor surface cannot be made perfectly level.

Load-bearing considerations

Our glass hatches are tested to a 2.0kN concentrated load and 1.5kN/m² uniform load, meeting UK building regulations for domestic floor loading (BS EN 1991-1-1). However, the floor structure surrounding the opening also needs to be capable of carrying that load. If you have any doubts about the structural integrity of your floor, speak to a structural engineer before proceeding.

Floor finish thickness

Think about the finished floor level. The hatch frame is designed to sit flush with your finished floor surface. If you're tiling, laying boards, or using any finish over the subfloor around the hatch, you'll need to account for the thickness of that finish when setting the frame height.

Frame banding and actuators

The unit is shipped with internal frame banding in place to maintain alignment during transit. Leave this banding in position until the frame is fully fixed and secured — removing it prematurely can allow the frame to move out of square before it is fixed. Additionally, do not remove or disconnect the gas strut actuators prior to installation; doing so may void the warranty and will make reinstallation significantly more difficult.

Installation process

1. Prepare the opening

The opening should be clean, square, and at the correct depth. Confirm the dimensions against your order before the unit arrives — it's much easier to adjust the opening now than once the hatch is on site. Remove all loose debris from the recess and ensure the bearing surfaces are clean and level.

2. Position the frame

Lower the frame into the opening and check it sits level in all directions using a precision spirit level. The frame must be parallel and level in both opposing planes — even a small twist in the frame will prevent the door from seating correctly and may cause binding or uneven gap around the glass panel. Use packers or shims if needed. The frame should sit at the correct height relative to your finished floor surface.

3. Fix the frame

Before driving all fixing screws home, check the alignment of the gap between the inner and outer frames on all four sides. The gap should be consistent and even; any inconsistency indicates the outer frame is under stress from the fixing surface and must be corrected before proceeding. Ensure the outer frame is not being forced out of shape by uneven substrate.

Once level and aligned, fix the frame to the surrounding floor structure following the fixing points provided. The method will depend on your floor construction — screws into timber, resin anchors into concrete, and so on. Do not over-tighten the fixings — excessive torque will distort the frame, affecting both appearance and operation. Tighten until firm and recheck the gap alignment. The frame should be solid and immovable before you continue.

4. Make good the surround

Once the frame is fixed, your builder can make good the surrounding floor finish up to the frame edge. Leave a small gap (2–3mm) around the perimeter to allow for any movement — do not grout or fill hard against the frame.

5. Remove banding and hang the door

Only once the frame is fully fixed and secure should you remove the internal frame banding. If the hatch was shipped with the glass panel detached for easier handling, reattach it according to the instructions supplied with your unit. Check the hinges are secure and the gas strut (or electric mechanism) operates smoothly. Open and close the door cautiously on first operation — check for any binding or misalignment before applying full force. The strut should hold the door open at the correct angle without slamming or dropping.

6. Final checks

• The glass panel should sit flush with the frame when closed, with no rocking or movement
• The gap between the glass panel and frame should be consistent on all sides
• The latch or locking mechanism (if fitted) should engage cleanly
• The anti-slip surface (if specified) should be facing upward
• The hinge side should open freely without catching on the floor finish

Electric versions

Our electric motorised hatches are UKCA certified and manufactured in compliance with the latest applicable European Standards. The mechanical installation follows the same process as the manual hatch above, with the following additional requirements:

• Do not connect power during installation. The electrical supply must remain disconnected throughout the installation process. Power should only be connected temporarily to test operation, and must be disconnected again before any further mechanical work continues.
• Qualified electrician required: All wiring must be completed by a qualified electrician. We supply the motor and control unit; your electrician will connect it to your power supply and test the operation. Refer to the wiring diagram supplied with your unit.
• Safety sounder: Before signing off the installation, confirm that the safety sounder activates correctly when the door moves to the closing position. This is a safety-critical function and must be operational before the unit is used.
• Remote controls: The remote handsets operate by line of sight only. Store remote controls in the wall-mounted holder provided, out of reach of children. Do not leave remote controls unattended near the hatch.

Annual and monthly maintenance (electric units)

Electric hatches require scheduled maintenance to ensure safe operation:

• Monthly: Visually inspect the unit for any signs of damage to the frame, glass, or mechanism. Test operation in both the opening and closing directions. Confirm the safety sounder activates on closing.
• Annually: A competent firm must carry out a full inspection and test of all safety features. A written record of this annual inspection must be kept. This is a mandatory requirement and failure to maintain records may affect any warranty or insurance considerations.

Aftercare

Toughened laminated glass requires very little maintenance. Keep the frame clean and check the hinge fixings annually — vibration from everyday use can occasionally work fixings slightly loose over time. The gas strut mechanism should last many years under normal use; if it becomes harder to operate over time, the strut can be replaced without affecting the frame or glass. Do not use abrasive cleaners on the glass surface or frame paintwork.

Need help?

If you have questions about your installation — before, during, or after — get in touch. We're happy to talk through the process with you or your builder.