How to Fit Skirting Boards: Measuring, Cutting and Fixing for a Professional Finish

Fitting skirting boards is one of those carpentry tasks that looks simple but has enough subtlety to trip up a first-timer. The difference between a professional and amateur finish usually comes down to a few specific skills: accurate internal corner scribing, consistent fixing and caulking. This guide covers all of it.

Choosing Your Skirting Board

Standard profiles available in the UK include:

• Torus: The classic Victorian curved profile, appropriate in period properties.
• Ogee: An S-shaped profile, more decorative, suits Georgian or ornate interiors.
• Chamfered and pencil round: Clean, contemporary profiles for modern homes.
• Square edge (MDF architrave): The most common in new builds — flat, minimal, easy to paint.

For material, MDF is the standard choice for painted skirting — it's dimensionally stable, takes paint well and costs around £2–4/m for standard heights (69–95mm). For stained or natural finishes, use softwood PAR (planed all round) or hardwood. Avoid cheap softwood if painting — it requires extensive filling of knots and the quality is variable.

Heights: 69mm (standard), 95mm (period), 120–150mm (Victorian/Edwardian matching), or custom profiles available from specialist joinery suppliers for restoration projects.

Tools Required

• Mitre saw (electric slide mitre saw makes repeated accurate cuts much easier) or mitre box and tenon saw
• Jigsaw or coping saw for scribing
• Spirit level
• Tape measure and pencil
• Multi-tool or oscillating saw (for trimming pipe notches)
• Panel pins and nail gun (a nail gun makes a 2-hour job of a 6-hour one)
• Decorator's caulk and caulk gun
• Construction adhesive (Gripfill or No More Nails)

External Corners: Mitres

External corners (where the skirting wraps around a projection, such as a chimney breast) use a standard 45° mitre cut on both pieces. The cut faces outward and the mitre meets at the corner of the wall.

UK houses are rarely perfectly square — the "90° corner" is often 88° or 91°. If your mitres don't close perfectly, use a digital angle finder (£15–20 from Screwfix) to measure the actual corner angle and set your saw to half that angle on each piece. This is a five-minute job that avoids a visible gap at a prominent corner.

Internal Corners: Scribing, Not Mitres

This is where most DIYers go wrong. Internal corners should never be mitred (despite what many online tutorials suggest). Mitred internal corners open up as the timber or MDF expands and contracts seasonally, leaving a visible V-shaped gap. The correct method is scribing (also called coping):

1. Fix the first board into the corner square (flush against the wall with a simple square butt end).
2. On the second board, run the saw blade along the profile at 45° — this reveals the profile shape on the face of the board.
3. Cut along this revealed profile line with a coping saw or jigsaw, angling the cut slightly back (undercut) so only the face touches the first board.
4. Offer up the scribed end — it should fit perfectly over the profile of the first board.

A properly scribed internal corner will stay tight even if the boards move with humidity changes, because the face-to-face contact is maintained throughout.

Fixing Methods

In UK homes, skirting can be fixed to:

• Masonry walls: Drill through the skirting and plaster into the brick (masonry bit, 6mm plug, 5 × 60mm wood screw, or 60mm cut nail). Fix points every 600–800mm.
• Plasterboard (stud walls): Fix to studs with 4 × 60mm wood screws. Between studs, use construction adhesive on the back of the board — do not rely on plasterboard pins alone for skirting.
• Combined approach: Adhesive on the back face plus pins or screws — this gives both immediate adhesion and long-term pull resistance.

Panel pins at an angle into masonry walls (skew-nailing) are a traditional fixing method that still works well. A brad nailer (available to hire from HSS for around £30/day) fires pins much faster than hand nailing and reduces the risk of splitting MDF.

Dealing with Uneven Floors

Most UK floors aren't perfectly level. Where the floor dips or rises, the gap between skirting and floor changes. Options:

• Set the skirting to the highest point of the floor and fill the gap at lower points with caulk (acceptable for up to 5mm, fills well under carpet/vinyl).
• Scribe the skirting to the floor: run a pencil along the floor while the skirting is held level, then cut along the pencil line with a jigsaw. This gives a perfect fit to an irregular floor.

Finishing

Fill nail holes with decorators' filler or fine surface filler. Apply decorator's caulk to the joint between the top edge of the skirting and the wall — this hides any gap and provides a clean line for painting. Run a thin bead, smooth with a damp finger, and allow to skin over before painting. Don't caulk the bottom edge of the skirting if laying carpet — the carpet gripper goes tight to the skirting and a caulk line would be unnecessary.

For MDF, prime with MDF primer before top-coating — MDF is very absorbent and standard emulsion or oil-based paint will raise the fibres without a primer. Two coats of satinwood after primer gives a durable, cleanable surface.

Cost

• Materials for a standard room (20m perimeter): £60–120 (MDF, fixings, caulk, filler)
• Professional carpenter: £40–60/hour; a typical room takes 4–6 hours including prime and first coat