How to Fit Skirting Boards: A Practical Step-by-Step Guide

Skirting boards do more than finish the edge between the wall and the floor. They protect plaster from knocks, conceal expansion gaps around flooring and give a room a clean, well-defined appearance. When they're fitted properly, they almost disappear into the room. When they're not, uneven joints, visible gaps and poor mitres are difficult to ignore.

Although fitting skirting boards is a popular DIY project, achieving a professional finish requires careful measuring, accurate cutting and an understanding of how walls and floors behave. Few rooms are perfectly square, especially in older properties across Cornwall and Devon, so expecting every corner to be exactly 90 degrees often leads to frustration.

At Wood.ED Joinery, we manufacture bespoke timber mouldings and regularly install skirting boards as part of larger renovation and refurbishment projects. We've found that success usually comes down to preparation rather than speed.

This guide explains how to fit skirting boards and highlights the common mistakes that can affect the finished result.

What tools will you need?

Before you begin, gather the following:

• Tape measure

• Pencil

• Mitre saw or mitre box and fine-tooth saw

• Coping saw

• Spirit level

• Combination square

• Adhesive suitable for skirting boards

• Screws and wall plugs (if mechanically fixing)

• Hammer and nail punch (for timber stud walls)

• Caulking gun

• Decorator's caulk

• Wood filler

• Sandpaper

Having everything ready before starting makes it much easier to work accurately.

Step 1: Measure the room

Measure each wall individually rather than assuming opposite walls are the same length.

Take note of:

• Internal corners

• External corners

• Door openings

• Radiator pipe positions

• Uneven walls

It's also worth checking whether the floor is level. Minor changes in floor height can affect how the skirting sits against the wall.

Step 2: Cut the first board

Where possible, begin with the longest, straightest wall.

If one end finishes in an internal corner, professional joiners use scribed joint rather than two mitres.

A scribed joint is often easier to achieve neatly because it follows the profile of the adjoining board, helping to disguise walls that aren't perfectly square.

For external corners, accurate mitre cuts are usually the best option.

Step 3: Test fit before fixing

Before applying adhesive or driving any fixings, position the board against the wall.

Check:

• The top edge sits evenly against the plaster

• The bottom edge follows the floor

• Joints meet cleanly

• Corners fit correctly

It's much easier to make small adjustments now than after the board has been fixed.

Step 4: Fix the skirting board

The fixing method depends on the wall construction.

For timber stud walls:

• Lost-head nails or screws into the studs are common.

For masonry walls:

• Use suitable wall plugs and screws or a high-strength grab adhesive where appropriate.

Many installations use a combination of adhesive and mechanical fixings for additional security.

If screws are used, countersink the heads slightly so they can be filled before decorating.

Real project: fitting skirting boards in a Victorian cottage near Fowey

We recently completed the internal joinery for a Victorian cottage renovation near Fowey.

The homeowners had removed the original skirting during rewiring and wanted new timber mouldings that matched the property's character.

The challenge was that the walls had settled over more than a century. Some internal corners measured 87 degrees, while others were closer to 94 degrees.

Rather than relying solely on mitre joints, we used scribed internal joints throughout the property.

During installation we found:

• One wall bowed by almost 9mm over a 2.4-metre length

• Floor levels varied by around 6mm between opposite corners of the room

• Original lime plaster created slight undulations along the wall surface

To achieve a neat finish, we carefully planed the back of selected boards where required, allowing them to sit tightly against the wall without forcing them into place. We also used timber packers behind sections where the masonry dipped before securing the boards with a combination of grab adhesive and concealed fixings.

Once decorated, the joints were virtually invisible, despite the irregular walls.

The success of the installation came from working with the building rather than expecting the building to behave like a modern new-build.

Step 5: Finish the joints

After fixing:

• Fill nail or screw holes with wood filler.

• Apply decorator's caulk along the top edge where the skirting meets the wall.

• Sand filled areas smooth once dry.

Avoid using excessive caulk to hide poor fitting. A properly fitted skirting board should require only a thin bead to create a clean finish.

Internal corners: Mitre or scribe?

This is one of the most common questions.

Many experienced joiners prefer:

Mitres for external corners

• Crisp appearance

• Works well where corners are square

Scribed joints for internal corners

• Better accommodates uneven walls

• Less likely to open if timber moves slightly

• Easier to adjust in older properties

In traditional homes across Cornwall and Devon, scribed joints often provide the most reliable long-term result.

Choosing the right skirting board

Different profiles suit different styles of property.

Common options include:

• Torus

• Ogee

• Chamfered

• Bullnose

• Victorian

• Edwardian

• Square edge contemporary designs

The choice often depends on the age and character of the property, as well as the style of architraves and doors already in place.

Timber species also matter. MDF is widely used for painted interiors because it offers a smooth, consistent finish, while hardwood and softwood remain popular where a natural timber finish is preferred.

Common mistakes to avoid

Some of the most frequent issues we see include:

Assuming every corner is 90 degrees

Very few are, particularly in older homes.

Always check the angle before cutting.

Cutting every board before test fitting

Install one section at a time.

Small measurement differences can affect every subsequent joint.

Using too much adhesive

Excess adhesive makes adjustment difficult and creates unnecessary cleaning work.

Ignoring wall irregularities

If the wall bows slightly, it's often better to adjust the board than force it into position.

Frequently Asked Questions

Is it better to glue or screw skirting boards?

It depends on the wall construction. Adhesive works well on flat, sound walls, while screws or nails provide a stronger fixing where walls are uneven or future removal may be necessary.

Should skirting boards be fitted before flooring?

In many cases, yes. Fitting skirting first allows flooring to be installed neatly against it, although some flooring systems use scotia or quadrant moulding instead.

What is the best joint for internal corners?

A scribed joint is generally preferred by professional joiners because it accommodates slight movement and uneven walls more effectively than a simple mitre.

How do I hide gaps between the wall and skirting?

Small gaps can be finished with decorator's caulk. Larger gaps usually indicate that the wall or board needs adjustment before decorating.

Well-fitted skirting boards don't rely on filler or caulk to look tidy. They depend on accurate measuring, careful cutting and taking the time to work with the room's imperfections. When each joint is fitted properly and the boards follow the natural shape of the walls, the result is a finish that feels built into the room rather than simply attached to it.