How Many Door Linings Do I Need?

How We Calculated This

Each door opening needs a complete lining set consisting of:

• 2 legs (jambs): Vertical pieces each side of the door, ~2100mm long
• 1 head: Horizontal piece across the top, ~830mm long (for a standard door)
• Per door: 1 lining set = ~5.03m of timber
• Example: 6 internal doors = 6 lining sets

Standard UK Door Lining Sizes

• 32 × 115mm: Standard for walls up to 115mm thick (single skin stud wall with plasterboard both sides)
• 32 × 132mm: For slightly thicker walls
• 32 × 140mm: For walls up to 140mm thick
• 44 × 115mm: Heavy-duty lining (fire doors)
• Adjustable linings: Telescopic, suit a range of wall thicknesses

Door Lining vs Door Frame

• Door lining: Thin (32mm), no rebate, used with door stops pinned on. Standard for internal doors.
• Door frame: Thicker (44–57mm), rebated (step routed into the frame for the door to close against). Used for external doors and fire doors.

Standard Internal Door Sizes (UK)

• 610 × 1981mm: 2′0″ — small rooms, ensuites
• 686 × 1981mm: 2′3″ — common internal
• 762 × 1981mm: 2′6″ — most common standard
• 826 × 2040mm: metric standard — increasingly common
• 926 × 2040mm: wheelchair accessible (Part M compliant)

Tips

Measure the wall thickness carefully before ordering linings — the lining width should match or slightly exceed the wall thickness so architrave sits flat. Fix linings plumb and square using packers and check with a spirit level. Use galvanised nails or screws to fix linings to the stud. Pre-hung door lining kits (with the door already fitted to the lining) save significant time on site.