How to install skirting boards in a room

🪚 Installing skirting boards in a room: clean set-out, accurate mitres, and a neat painted finish

What is the purpose of installing skirting boards in a room?

Installing skirting boards is a straightforward finishing task that lifts the look of any room, covers expansion gaps at flooring edges, and protects the base of plasterboard walls from knocks and scuffs. For Australian homeowners and DIY renovators, the key to a professional result is careful measuring, accurate internal and external corner cuts, and selecting the right fixing method for your wall type.

This guide covers the full process for timber or MDF skirting installation in a typical room, including scribing, mitring, nailing, adhesive fixing, filling, and final preparation for paint. Where relevant, work should align with good trade practice and general framing principles under AS 1684 Residential Timber-Framed Construction, particularly when fixing into timber studs.

What skill level is required to install skirting boards?

Intermediate — Estimated time: 4–8 hours for one standard room, depending on room size, wall straightness, and number of corners

What tools are essential for installing skirting boards?

What materials are needed for a skirting board installation?

Safety Requirements

Step-by-Step Guide

Step 1: Measure the room and plan the board layout

Start by measuring each wall individually in mm, not just the overall room size. Walls are often slightly out, so each length should be cut to suit its exact location.

Note all internal corners, external corners, door architraves, and any transitions where skirting stops. Mark a simple room plan on paper and write each wall length beside it.

Where possible, plan joints so they land in less visible areas. If a wall is longer than your available board length, use a scarf joint rather than a butt joint for a cleaner result.

💡 A professional approach is to install the most visible wall first, then work around the room so minor discrepancies finish in low-visibility areas such as behind doors.

Step 2: Check wall condition, floor level, and stud locations

Run a 1200 mm spirit level or straightedge along the wall base to identify bows, hollows, or high spots. Also check whether the floor rises or falls across the room.

Use a stud finder to locate and mark stud positions above the intended skirting line. On timber-framed walls, fixing into studs provides the most secure result, consistent with standard framing practice under AS 1684.

If you are fixing to masonry or brick internal walls, the method may change to adhesive plus masonry fasteners. For plasterboard over timber frame, adhesive and brads into studs is the usual approach.

💡 Mark stud centres lightly on the wall with pencil so they remain visible until after caulking and painting.

Step 3: Select the fixing method

There are three common fixing methods for skirting installation:

For most DIY installations, a combination of construction adhesive and 40–50 mm brad nails is the easiest and most reliable method.

If hand nailing, use 50–65 mm bullet head nails and punch them below the surface before filling.

Step 4: Cut the first straight length

Begin on the longest, straightest wall if possible. Measure the wall carefully and transfer the measurement to the skirting board.

For a board running into square-cut ends, cut the board to exact length using a compound mitre saw. If one end dies into an architrave, allow a neat, tight termination.

Dry-fit the board against the wall before applying adhesive or fixing. Check that the top edge sits consistently and the bottom edge contacts the floor without major gaps.

If the floor is uneven, position the board level to the floor line visually rather than forcing it hard down in one spot and leaving larger gaps elsewhere.

Step 5: Form internal corners correctly

Internal corners can be done two ways:

For painted skirting, a scribed internal corner usually gives the best long-term result because it handles out-of-square corners better and is less likely to open up over time.

To create a scribed corner:

For beginners, mitred internal corners are quicker, but they can show gaps if walls are not exactly 90°.

💡 If the corner is badly out of square, test-cut scrap pieces first and adjust the saw angle slightly off 45° until the fit is tight.

Step 6: Cut external corners with accurate mitres

External corners are more visible, so accuracy matters. Measure to the outside arris carefully and cut matching mitres, usually 45° + 45° for a 90° corner.

Dry-fit both pieces together before fixing. If the corner is not a true 90°, adjust the mitre angle to suit. For example, a slightly open corner may need both cuts trimmed to 44° or 46° depending on the actual angle.

Apply a small amount of adhesive at the joint if needed, but avoid excess squeeze-out on primed or finished surfaces.

Fix external corners securely so they cannot move apart before filling and painting.

Step 7: Join long lengths with scarf joints

If one wall needs more than one board length, avoid a straight butt joint where possible. Instead, use a scarf joint, typically cut at 30–45°, so the join is less visible and less prone to cracking.

Set the joint so the overlap faces away from the main viewing angle of the room. Apply a little adhesive to the join and fix both sides firmly.

Where the joint falls between studs, try to position a small backing block behind the join if practical, especially on timber skirting.

💡 A scarf joint on a long run always looks more professional than a square butt join, particularly after painting.

Step 8: Apply adhesive and fix the skirting

Run a moderate bead of construction adhesive along the back of the skirting board, keeping it clear of the very top edge so squeeze-out does not stain the wall.

Press the board into place and align it with your marks. Nail off into studs at roughly 450–600 mm centres, with extra fixings near corners and joins if needed.

Typical fixing approach:

If hand nailing, keep nails away from delicate profile edges to reduce splitting. Pre-drill near ends if using hardwood skirting.

For masonry walls, use a suitable adhesive and masonry fixing method, or seek product-specific installation guidance.

Step 9: Deal with uneven walls and floors

Older homes often have bowed plaster, unsquare corners, and inconsistent floors. Do not force the skirting so hard that the profile distorts.

If the wall has a hollow, use adhesive and firm nailing into stud locations to pull the board in. If there is still a gap, a small amount of paintable acrylic gap filler along the top edge will finish it neatly.

If the floor dips and leaves a small gap beneath the skirting, this may be acceptable in low-visibility areas, but larger gaps should be addressed carefully. In some cases, a light scribe to the floor may be required for a premium finish.

💡 In renovation work, the best trade result is often about making imperfections look intentional and visually straight, not chasing every surface defect.

Step 10: Finish around architraves and door openings

Where skirting meets a door architrave, cut the end neatly so it terminates cleanly against the architrave edge. Make sure the skirting thickness and profile suit the architrave detail.

If the skirting is thicker than the architrave or requires a return, you may need to cut a small mitred return piece for a finished look.

Check that all transitions are neat and do not project awkwardly into walkways or create catch points.

Step 11: Fill nail holes, joints, and gaps

Once all skirting is fixed, fill:

Do not overfill profile details. Apply filler neatly and sparingly, then allow it to cure fully according to the product instructions.

Any adhesive squeeze-out should be cleaned while still workable.

Step 12: Sand, prime, and prepare for paint

Lightly sand all filled areas so they blend smoothly into the face of the skirting. Use a fine abrasive to avoid scratching primed MDF or creating visible flat spots on shaped profiles.

Spot-prime any bare filler or cut ends, especially on MDF, as raw edges can absorb paint differently.

At this stage, the skirting should appear continuous, with tidy corners, flush joints, and no visible fixing marks.

Step 13: Final inspection and paint finish

Inspect each wall at standing height and low angle light. Check corners, top-edge caulking, and all joins for shadow lines or imperfections.

Apply your chosen paint system if the skirting is not pre-finished. Two topcoats usually provide the best durability in living areas, hallways, and bedrooms.

Once complete, remove dust, masking, and offcuts, and check that all door clearances remain correct.

Common Mistakes to Avoid

Small discrepancies in wall length and corner angle quickly lead to poor fits.

A visible butt join is more likely to crack and is harder to hide than a scarf joint.

Scribed internal corners usually perform better and look tighter over time.

Excess adhesive can squeeze out, stain surfaces, and make finishing harder.

Skirting fixed only to plasterboard can loosen, especially in high-traffic areas.

Even well-cut boards can look unfinished without proper caulking, filling, and sanding.

Pro Tips

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