How to fit tongue-and-groove wall panelling

Video by B&Q. This guide is based on the practical demonstration "How to install Tongue & Groove wall panelling" from B&Q's "You Can Do It" series, presented by joiner and content creator Alex Lawson. It covers the full installation process from planning through to painting, and is well worth watching before you buy your boards — particularly the section on calculating coverage and planning the layout so you do not end up with a very thin offcut at one end of the wall.

1. Plan the layout and measure up

Decide how high the panelling will run up the wall. A classic dado height is around 900 mm from the floor; full-height panelling to the ceiling makes a bolder statement. Measure the wall width and divide by the board width to work out how many full boards you need and what size the cut piece at each end will be.

If possible, plan so the cut pieces at each end of the wall are roughly equal in width. Starting from the middle of the wall and working out is one way to achieve this. Also buy around 10% extra boards to allow for waste when cutting around sockets, light switches, or any other obstacles.

2. Prepare the wall

The boards need something solid to fix to. On a flat, dry plasterboard or plaster wall, you can nail directly into the studs (use a stud finder to locate them) or fix timber battens horizontally at 400 mm intervals up the wall height. Battens are the safer approach on older, uneven walls — they give you a flat, consistent surface to work against.

Fix battens using 50 mm screws into the wall. Check each batten is level before moving on. This is the most important preparation step — wonky battens will give you wonky boards that you simply cannot fix later.

3. Set the base rail or bottom batten

The bottom edge of the panelling needs a clean, level line to sit on. Fix a horizontal batten (or use a purposemade base rail) at the height where you want the panelling to start, checking it is perfectly level with a spirit level. This is the reference line everything else hangs from.

If the floor is uneven — and in older UK houses it usually is — do not follow the floor. Follow the level line. The gap between the floor and the base of the panelling can be covered by the existing skirting board or a new piece of quadrant moulding.

4. Fix the first board plumb

The first board is the most critical one to get right. Check it is perfectly vertical with a spirit level, not just aligned with the wall corner — corners in old houses are rarely square. Nail through the tongue at an angle (secret nailing) so the nail head is hidden when the next board slots in.

For MDF boards, panel adhesive on the back as well as nails gives a better, flatter result. Apply adhesive in a zigzag pattern, press the board firmly, and nail to hold it while the adhesive grabs.

5. Work across the wall, board by board

Slot each board into the previous one — the groove of the new board slides over the tongue of the board already fixed. Press firmly and tap with a rubber mallet via a scrap offcut to seat each board without damaging the profile. Fix through the tongue at each horizontal batten.

Check every three or four boards that they are still running vertically. Boards have a way of creeping slightly out of plumb over a long run. Catch it early and make a tiny correction; leave it and the problem compounds all the way to the end of the wall.

6. Cut and fit boards around obstacles

Sockets, switches, and pipes need careful measuring and cutting. Mark the board using a template cut from cardboard first, then transfer the template to the board before cutting with a jigsaw. Take it slow — a good fit around a socket looks professional; a rough one will be the first thing visitors notice.

Turn off the circuit at the consumer unit before bringing boards close to electrical fittings. Sockets and light switches may need extension boxes to bring their faces flush with the new panel surface once the boards are fitted.

7. Fit the top rail and cap the panel

At the top of the panelling, fit a dado rail or a simple timber cap rail to give a clean, finished edge. Mitre the corners at 45 degrees for internal corners and cope or mitre external corners. Nail through into the batten behind, punch the nail heads below the surface, and fill the holes.

Run a bead of decorator's caulk along all the joints between the panel and adjacent walls, the top rail, and the skirting board. Smooth with a damp finger. Caulk, not filler — filler cracks as the timber moves with seasonal humidity. Caulk flexes.

8. Prime and paint for a clean finish

MDF boards need a coat of MDF primer before topcoat — without it, the paint soaks in unevenly and you will need four or five topcoats to get a solid finish. Timber boards can go straight to an undercoat or a water-based primer.

Sand lightly between coats with 240-grit paper for a smooth finish. Two topcoats of a quality eggshell or satinwood paint will give a washable, durable result that holds up well in hallways and bathrooms where panelling tends to get knocked and splashed.

When to call a handyman

Call Richard if the walls are very uneven and need significant batten packing, if sockets or switches need extending, or if you want the job done in a day rather than over a weekend. Tongue-and-groove panelling is satisfying work but it does take time to get right, particularly around obstacles.