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How to install door jambs and architraves

This guide details the professional installation of timber door jambs and architraves, a critical finishing task in both new construction and renovation projects. Accurate installation ensures proper door function, aesthetic appeal, and compliance with Australian building standards. This process req

Skill level
Intermediate
Time
2-4 hours per door opening
Trade
Carpentry & Joinery
Updated
4 November 2026

Tools you will need

  • Tape Measure: 8m, professional grade.
  • Pencil: H or 2H for clear marking.
  • Combination Square: For accurate 90
  • Level: 1200mm and 600mm for plumb and level checks.
  • Mallet: Rubber or timber for gentle persuasion.
  • Power Saw: Drop saw
  • Circular Saw: For trimming jambs if required.
  • Block Plane: For fine adjustments to jamb edges.
  • Nail Gun: 15
  • Hammer: Claw hammer for hand nailing or adjusting.

🪚 Door Jamb & Architrave Installation Guide

What is involved in installing door jambs and architraves professionally?

This guide details the professional installation of timber door jambs and architraves, a critical finishing task in both new construction and renovation projects. Accurate installation ensures proper door function, aesthetic appeal, and compliance with Australian building standards. This process requires precision in measurement, cutting, and fixing to achieve a seamless, durable finish.

What skill level is required for door jamb and architrave installation?

Intermediate — Estimated time: 2-4 hours per door opening

What essential tools are needed for installing door jambs and architraves?

Tape Measure: 8m, professional grade. Pencil: H or 2H for clear marking. Combination Square: For accurate 90-degree and 45-degree markings. Level: 1200mm and 600mm for plumb and level checks. Chisel Set: 12mm, 25mm, 38mm for hinge and strike plate rebates. Mallet: Rubber or timber for gentle persuasion. Power Saw: Drop saw (mitre saw) with a fine-tooth blade for precise cuts. Circular Saw: For trimming jambs if required. Block Plane: For fine adjustments to jamb edges. Nail Gun: 15-gauge or 16-gauge finish nailer with appropriate length nails (e.g., 50mm, 65mm). Hammer: Claw hammer for hand nailing or adjusting. Drill/Driver: With appropriate bits for pilot holes and screw fixing. Utility Knife: For scoring and trimming. Caulking Gun: For gap filler. Sanding Block & Paper: Fine grit for preparation.

What materials are typically required for door jamb and architrave installation?

 Door Jamb Set: Typically 3-piece (2x stiles, 1x head) in 90x30mm or 110x30mm finger-jointed pine, or solid timber to match door thickness (e.g., 35mm or 40mm door requires 90mm or 110mm jamb). Ensure sufficient length for head and stiles. Architrave Timber: Typically 67x18mm or 90x18mm finger-jointed pine, or solid timber. Allow for 2x vertical lengths and 1x horizontal length per side of the opening, plus wastage for mitre cuts. Timber Shims/Wedges: Various thicknesses (e.g., 1.5mm, 3mm, 5mm) for packing. Construction Adhesive: High-strength, flexible (e.g., Liquid Nails). Finish Nails: 50mm and 65mm, galvanised or bright steel depending on finish. Wood Screws: 75mm or 100mm, countersunk head, for securing jambs to studs. Gap Filler/Wood Putty: Paintable, flexible. Sandpaper: 120-grit and 180-grit.

Safety Requirements

⚠️ Mandatory Safety:

 Eye Protection: Always wear safety glasses to protect against flying debris. Hearing Protection: Use earmuffs or earplugs when operating power tools. Dust Mask: P2 respirator for timber dust, especially when cutting MDF or treated timbers. Gloves: For handling timber and preventing splinters. Stable Work Platform: Ensure ladders or saw horses are stable and rated for your weight. Electrical Safety: Inspect power tool cords for damage before use. Manual Handling: Be aware of timber lengths and weights to prevent strains. Australian Standards: Adhere to AS 1684 Residential Timber-Framed Construction for structural elements and AS/NZS 1859 for timber products.

Step-by-Step Guide

Step 1: 1️⃣ Prepare the Opening

 Check Rough Opening: Ensure the rough stud opening is plumb, level, and square. For a standard 820mm door, the rough opening should be approximately 870mm wide and 2070mm high (door height + 40mm for jamb head + 10mm for floor clearance). Clear Debris: Remove any plaster, nails, or obstructions from the rough opening. Moisture Barrier: If in a wet area or external wall, ensure appropriate moisture barriers are in place.

Step 2: 2️⃣ Assemble the Jamb Set

Cut Head Jamb: Measure the width of the door plus 6mm (3mm clearance per side). For an 820mm door, cut the head jamb to 826mm. Rebate Head Jamb: Using a router or chisel, rebate the ends of the head jamb to accept the top of the side jambs. The rebate depth should match the jamb thickness (e.g., 30mm). Assemble: Apply construction adhesive to the rebates and secure the head jamb to the side jambs using two 65mm finish nails per joint, or screws for added strength. Ensure the assembly is square. 💡 Pro Tip: Use a large framing square or a couple of clamps to hold the jamb square while fixing.

Step 3: 3️⃣ Install the Jamb Assembly

Position Jamb: Carefully lift the assembled jamb into the rough opening. Ensure the jamb is flush with the plasterboard on the side where the door will open (the "door swing" side). Shim and Plumb: Starting with the hinge side, use timber shims to pack the jamb plumb and straight. Place shims behind hinge locations and at the top, middle, and bottom. Use a 1200mm level to check for plumb and straightness. Fix Hinge Side: Once plumb and straight, pre-drill and screw the hinge-side jamb to the studs using 75mm or 100mm screws, countersinking the heads. Place screws behind where hinges will be installed to conceal them. Fix Latch Side: Repeat the shimming and plumbing process for the latch side jamb, ensuring the gap between the jambs is consistent (door width + 6mm). Fix Head Jamb: Shim the head jamb level and fix it to the head stud using screws. Check for Square: Double-check the entire jamb assembly for plumb, level, and square. The diagonal measurements should be equal. 💡 Pro Tip: For a perfect reveal, use a piece of the door material or a 3mm packer to set the gap between the door and the jambs.

Step 4: 4️⃣ Install Architraves - Hinge Side

 Measure Vertical: Measure the vertical length from the finished floor to the top of the jamb head. Add 5mm for the reveal (the consistent gap between the jamb and architrave). Cut Mitre: Using a drop saw, cut a 45-degree mitre at the top of the architrave, ensuring the long point is on the outside edge. Position and Fix: Apply a bead of construction adhesive to the back of the architrave. Position it with a consistent 5mm reveal from the jamb edge. Fix with 50mm finish nails into the jamb and 65mm finish nails into the studs. Stagger nails to prevent splitting. 💡 Pro Tip: Use a reveal gauge or a small offcut of timber to maintain a consistent reveal.

Step 5: 5️⃣ Install Architraves - Head

 Measure Horizontal: Measure the distance between the outside edges of the two vertical architraves. Cut Mitres: Cut a 45-degree mitre at each end of the head architrave, ensuring the long points match the measurement. Position and Fix: Apply adhesive and position the head architrave, aligning the mitre joints perfectly. Fix with 50mm finish nails into the jamb head and 65mm finish nails into the head stud. 💡 Pro Tip: For tight mitres, apply a small amount of wood glue to the joint before nailing.

Step 6: 6️⃣ Install Architraves - Latch Side

 Measure and Cut: Repeat the process from Step 4 for the latch side vertical architrave, ensuring the mitre joint aligns perfectly with the head architrave. Position and Fix: Apply adhesive and fix as before, maintaining the 5mm reveal.

Step 7: 7️⃣ Finishing Touches

 Nail Punching: Punch all finish nails below the surface. Fill Gaps: Fill all nail holes and any small gaps in the mitre joints or between the architrave and wall with paintable gap filler or wood putty. Sand: Lightly sand all filled areas smooth with 180-grit sandpaper. Clean: Wipe down all surfaces to remove dust, preparing for painting or staining.

Common Mistakes to Avoid

1.Incorrect Rough Opening Size: Leads to difficulty plumbing and squaring the jamb, or insufficient space for the door.
2.Not Checking Plumb and Level: A non-plumb or non-level jamb will result in a door that doesn't close properly or swings open/closed on its own.
3.Inconsistent Reveal: Uneven gaps between the jamb and architrave look unprofessional and highlight imperfections.
4.Poor Mitre Joints: Gaps in mitre joints are a dead giveaway of amateur work. Ensure precise cuts and tight fit-up.
5.Over-Nailing or Under-Nailing: Too many nails can split timber; too few can lead to movement and gaps. Use appropriate nail lengths and spacing.

Pro Tips

 💡 Dry Fit Everything: Before applying adhesive or permanent fixings, dry fit all components to check for fit and alignment. 💡 Use a Story Stick: Create a story stick with your desired reveal marked on it to ensure consistency around all openings. 💡 Pre-Drill Hardwoods: When working with hardwoods, always pre-drill pilot holes for nails and screws to prevent splitting. 💡 Consider Door Swing: Always install jambs flush with the plasterboard on the side the door will open to allow the door to open fully without hitting the architrave. 💡 EOF Y Instant Asset Write-Off: Remember to claim the instant asset write-off for any new power tools over $300 purchased for your business before June 30.

Recommended Tools

Festool Kapex KS 120 EB Mitre Saw: Unmatched precision and dust extraction for perfect mitre cuts. Paslode IM250S Impulse Bradder: Cordless convenience and reliability for fast, efficient finish nailing. Stanley FatMax Xtreme Tape Measure: Durable, accurate, and easy to read for precise measurements. Stabila Type 196-2 Level Set: German-engineered levels known for their accuracy and durability, essential for plumb and level checks.

Frequently asked questions

What is involved in install door jambs and architraves?
This guide details the professional installation of timber door jambs and architraves, a critical finishing task in both new construction and renovation projects. Accurate installation ensures proper door function, aesthetic appeal, and compliance with Australian building standards. This process req
What skill level do I need for install door jambs and architraves?
Intermediate — Estimated time: 2-4 hours per door opening
What are common mistakes when install door jambs and architraves?
1. Incorrect Rough Opening Size: Leads to difficulty plumbing and squaring the jamb, or insufficient space for the door. 2. Not Checking Plumb and Level: A non-plumb or non-level jamb will result in a door that doesn't close properly or swings open/closed on its own. 3. Inconsistent Reveal: Uneven gaps between the jamb and architrave look unprofessional and highlight imperfections.
What tools do I need for install door jambs and architraves?
This guide includes a comprehensive tools list. Key carpentry & joinery tools are detailed in the Tools Required section.
What is involved in installing door jambs and architraves?
Professional installation of timber door jambs and architraves is a critical finishing task in Australian construction. It ensures proper door function, aesthetic appeal, and compliance with AS 1720.1-2010. This process requires precise measurement, cutting, and fixing to achieve a seamless, durable finish, typically taking 2-4 hours per opening.
What skill level is required for door jamb and architrave installation?
An intermediate skill level is required for door jamb and architrave installation. This task demands precision in measurement, plumb and level checks, and accurate cutting. Tradies should be proficient with power tools like drop saws and nail guns, and understand timber characteristics and Australian building tolerances.
What are common mistakes when installing door jambs and architraves?
Common mistakes include incorrect rough opening size, which impacts jamb plumbing, and failing to check for plumb and level, leading to doors that don't close correctly. Inconsistent reveals between the jamb and architrave also result in an unprofessional finish. Always verify dimensions against AS 1720.1-2010 guidelines.
What Australian standards apply to door jamb and architrave installation?
The primary Australian standard for timber construction, including door framing, is AS 1720.1-2010, 'Timber structures – Design methods'. Additionally, AS/NZS 4063.1:2010 covers general requirements for timber products. Compliance ensures structural integrity and appropriate material selection for Australian conditions.

Written by Chippy, the Carpentry & Joinery specialist at Aus.Tools.