How to Fit Parliament Hinges: Professional Tips

How to Fit Parliament Hinges: Professional Tips

Parliament hinge selection and fitting require careful measuring, correct fixings and good technique if you want doors or casements to open fully and clear trims or architraves. Whether you are a trade professional fitting internal and external doors, or a competent DIYer working on timber or aluminium frames, these practical tips will help you achieve a neat, durable installation.

What is a parliament hinge and when to use one

A parliament hinge is a type of butt hinge with a wider, offset knuckle so the opening leaf clears architraves, skirting or casement reveals. The design allows doors and windows to swing almost flat against the wall; commonly referred to as 180 degree operation. They are popular for French doors, patio doors and some casement windows where full opening is required.

Tools and materials you will need

• Parliament hinges: choose the correct size and material; brass, stainless steel or powder-coated steel.
• Screws: match hinge countersink and substrate; use stainless for external installations.
• Chisel set and mallet, or a rebate router for clean mortices.
• Drill and correct pilot bits; countersink bit where required.
• Spirit level, square, tape measure and marking pencil.
• Packers and clamps to hold door during fitting.
• Torque screwdriver or impact driver for faster fixing; avoid over-tightening.
• Lubricant (light machine oil) and thread-lock for exterior installations if necessary.

Choosing the right parliament hinge

Select a hinge rated for the door weight and application. For heavy doors choose ball-bearing parliament hinges; they reduce friction and wear. For external doors, use stainless steel or corrosion-resistant finishes. Check hinge leaf width and projection: the hinge must provide sufficient offset to clear architrave thickness. For UPVC or aluminium frames use specialist hinge plates or screw anchors that engage the frame reinforcement; standard timber screws will not work.

Preparing and marking out

Accurate marking makes installation straightforward. Typical hinge positions are:

• Top hinge: 150mm from the top edge of the door.
• Bottom hinge: 150mm from the bottom edge.
• Middle hinge: positioned centrally between the other two; for heavy doors a third hinge is essential.

Maintain consistent door gaps: 2 to 4mm at the sides and head is usual for internal timber doors; increase slightly for external doors to allow for seasonal movement. Mark hinge positions on both the door and frame, ensuring the offset of the parliament hinge member is orientated to achieve the required swing clearance.

Morticing the hinge

If you want a flush fit, dead-flat morticing is required. Set mortice depth to match the hinge leaf thickness so each leaf sits flush with the edge when closed. For timber doors use a sharp chisel and tidy up with a router if you have one; a router will speed up the job and provide a neater finish on visible joinery. If using surface-mounted parliament hinges, ensure the screws still bite into solid timber or the reinforcement plate on metal/UPVC frames.

Fixing the hinge and aligning the door

• Pre-drill pilot holes: pilot holes prevent split timber; aim for a pilot diameter of about 2/3 of the screw core in hardwoods.
• Temporarily screw the hinges to the door first, then lift the door into the frame and secure the hinge to the frame with just one screw per leaf to allow fine adjustment.
• Check vertical and lateral alignment with a spirit level; adjust using packers under the door where necessary.
• When aligned, drive the remaining screws; countersink if the hinge requires it.
• Test operation through the full 180 degrees to confirm clearances; adjust as required.

Practical trade tips and common pitfalls

• Use the correct screw length: screws must penetrate sufficient substrate. For softwood use 30–40mm screws; for hardwood and heavy doors use 40–60mm coach screws into a backer block if possible.
• For metal or aluminium frames avoid self-tapping screws into thin skins; use rivet nuts, threaded inserts or expanders that engage the reinforced section.
• If fitting to UPVC, use the manufacturer-approved hinge pack and fasten into the steel reinforcement within the frame; avoid long screws that could damage the profile.
• For external and coastal locations use 316 stainless steel to prevent corrosion.
• Do not use standard parliament hinges on fire doors unless they are certified for fire use; fire doors require intumescent-compatible, fire-rated hinges and must meet Building Regulations.
• When morticing, remove small amounts and test fit often; removing too much timber cannot be easily corrected.

Maintenance and adjustment

After installation, check the hinge screw security after a few weeks as timber settles. Lubricate the knuckle annually and replace any stripped screws. For adjustable hinges, follow manufacturer instructions for minor height or lateral adjustments. Keep moving parts clean and check for sagging; sagging usually indicates worn screws or hinges that are undersized for the door weight.

Special cases: casement windows and double doors

Parliament hinges are occasionally used on casement windows where a wide opening is required; however casements often use friction stays or butt hinges depending on design. For double doors, fit meeting stiles accurately and ensure hinges on both leaves are matched so both leaves can open flat without binding. Consider using rebated thresholds or bolts to lock the inactive leaf if required.

Safety and compliance

Always consider compliance with local building regulations and safety standards. For fire doors consult a certifier and use only specified fire-rated hinges and fixings. Ensure external doors meet weatherproofing requirements; fitting a parliament hinge can alter how seals and thresholds engage so check draught proofing after installation.

Recommended Products

Based on this article, you may find these products helpful:

• Top Hung Friction Stay - 12"
• ERA Egress (Fire escape) Friction Stay
• TSS Standard Friction Stays – 13mm & 17mm Stack Height
• Restricted Friction Stay Hinges
• Patio Door Handle Set - 92PZ White

Conclusion and next steps

Fitting a parliament hinge correctly combines the right hardware, accurate morticing and careful alignment. For best results choose a hinge sized to the door, use corrosion-resistant materials for external use and follow the fixings guidance above. If you need more detailed specification options or fire-rated products, visit our door hinge hub at /guides/door-hinges or contact our technical team for product recommendations. For a first-time installation practise on a spare piece of timber to refine your mortice technique before working on a finished door.