DIY

Shaker panelling: how to space and mark out the boxes

By Matt Chapman/Published 4 November 2026/8 min read

Shaker panelling (a frame of flat MDF strips that turns a plain wall into a row of boxes) is one of the most satisfying DIY jobs you can do in a weekend. The materials are cheap and the cutting is simple. What makes it look professional or homemade is the spacing: boxes that are all exactly the same width, end stiles that match, and rails that are level even when the floor isn’t.

This guide covers how to choose the height and number of boxes, the formula for even spacing with a worked example, how to mark the wall out so small errors don’t add up, the order to fit the pieces, and how to handle sockets, corners and windows.

The parts and what you need

A shaker panel is built from three kinds of strip:

• Bottom rail: a horizontal strip sitting on top of the skirting board.
• Top rail: a horizontal strip along the top of the panelling.
• Stiles: vertical strips between the rails, one at each end of the wall and one between each pair of boxes.

For tools and materials you’ll want:

• MDF strips, usually 6 mm to 12 mm thick. 69 mm and 94 mm widths are the most popular for shaker boxes.
• A mitre saw (or a mitre box and fine-toothed saw), a tape measure, a pencil and a combination square.
• A laser level or a long spirit level.
• Panel adhesive, plus panel pins or a nail gun to hold strips while it sets.
• Decorator’s caulk, wood filler, fine sandpaper, primer and paint.
• A cable and pipe detector.

Check the wall for hidden cables and pipes before you nail, pin or screw anything. Cables often run straight up, down or across from sockets and switches. Turn the power off at the consumer unit before removing or loosening any faceplate.

Step 1: Measure the wall

Measure the width of the wall at the bottom, middle and the height you plan to finish at. Walls are rarely perfectly straight, and the corners may not be square. Use the smallest width, so the end stiles fit without forcing.

Then measure the height of the skirting board from the floor. If you’re keeping the skirting, the bottom rail will sit on it.

If the wall meets another wall you’re also panelling, panel one wall first and measure the second wall from the face of the first wall’s end stile. Otherwise the second wall’s boxes come out a strip-thickness too wide.

Step 2: Choose the height and number of boxes

For half-height panelling, a top rail at about one third to just under half of the wall height looks right in most rooms. In a typical UK room with a 2.4 m ceiling that’s around 900 mm to 1,200 mm from the floor. Line it up with a window sill or the top of a radiator if you can: matching heights make it look planned.

Full-height panelling usually has two or three rows of boxes, with extra rails between the rows. Making the bottom row a little shorter than the others often looks better than equal rows.

Then choose how many boxes to have across. There’s no fixed rule, but boxes between about 400 mm and 700 mm wide look balanced on most walls, and many people prefer boxes a little taller than they are wide. Try two or three different numbers on paper before you decide.

Step 3: Work out the spacing

With a stile at each end and one between every box, n boxes need n + 1 stiles. Take the stiles away from the wall width and share what’s left between the boxes:

box width = (wall width − (boxes + 1) × strip width) ÷ boxes

And for the height of the boxes (one row):

box height = panelling height − skirting − bottom rail − top rail

Worked example

A 3,000 mm wall with 120 mm skirting, panelling to 1,000 mm high, 69 mm strips and four boxes:

• Stiles: 4 + 1 = 5 stiles × 69 mm = 345 mm
• Box width: (3,000 − 345) ÷ 4 = 663.75 mm
• Box height: 1,000 − 120 − 69 − 69 = 742 mm

That gives boxes slightly taller than they are wide, which looks good. Five boxes would make them (3,000 − 414) ÷ 5 = 517.2 mm wide, noticeably taller and narrower. Both work; it’s a matter of taste.

The wall panelling calculator does this for any wall, shows a scaled drawing so you can compare layouts, and lists every marking position and cut length.

Step 4: Mark out from one end

The most common mistake is to fix the first stile, measure one box width, fix the next stile, and so on. Every small error carries on to the next box, and by the far end the last box is 10 mm out. Instead, mark every stile position measured from the left-hand end of the wall.

The distance from one stile’s left edge to the next is one box width plus one strip width: 663.75 + 69 = 732.75 mm in the example. So the left edges of the stiles are at:

Hook the tape on the left-hand corner and mark them all in one go, then put a cross on the side each strip goes so you don’t fix one on the wrong side of the line.

For the rails, don’t measure up from the floor at every point: floors are often out of level. Measure the top rail height at the lowest point of the floor, then use a laser or spirit level to draw a level line across the whole wall from there. The bottom rail sits on the skirting.

Step 5: Cut and fit in the right order

1. Bottom rail first. Fix it on top of the skirting along the full width of the wall. If the skirting isn’t level, use the level line as your guide and fill any gap with caulk later.
2. Top rail next, with its top edge on the level line.
3. Stiles last. Measure the gap between the rails at each stile position and cut each stile to suit. In the example they should all be about 742 mm, but if the floor or skirting dips, one may need to be a millimetre or two longer. Cut a little long, offer it up and trim to a snug fit.

Most MDF strips come in lengths of 2.4 m to 2.7 m, so a 3 m rail needs a join. Put the join in line with the centre of a stile, where the eye reads it as part of the frame and a little filler hides it. In the example, the middle stile’s centre is at 1,465.5 + 34.5 = 1,500 mm, so each rail can be made from two 1,500 mm pieces meeting directly above (or below) that stile.

Apply panel adhesive in a wavy line on the back, press the strip to the wall, check it with the level and pin it. Use a spacer block cut to the box width (663.75 mm, or as near as you can cut it) to set each stile: push it against the last stile, put the next one against it, and check it’s plumb. It’s quicker than measuring and keeps the spacing even if your marks get covered by adhesive.

Sockets, switches, corners and windows

Sockets and switches. A UK single faceplate is 86 mm square. If a stile lands on one, try one box more or fewer across the wall, which moves every stile. If nothing works, you can notch the strip around the faceplate, or have an electrician fit a deeper back box or socket spacer so the faceplate sits flat on the panelling. Always turn the power off first.

Internal corners. Butt the end stile tight into the corner. If the corner isn’t straight, scribe the stile to fit: hold it against the wall, run a pencil down the gap with a spacer, and plane or sand to the line.

External corners. Either finish each wall with a stile that stops at the corner and add a small corner bead, or mitre the rails at 45°. Mitres look best but need accurate cutting, so practise on offcuts.

Windows and radiators. Treat the window or radiator as the edge of the wall: work out each section between obstacles on its own, so each one has evenly spaced boxes. Line the top rail up with the window sill if the heights are close.

Step 6: Check and finish

Before the adhesive sets, check the work:

• Box widths: measure each box at the top and bottom. They should all match to within a millimetre or two.
• Square boxes: measure both diagonals of each box. If they’re equal, the box is square.
• Level and plumb: check the top rail with the level along its length, and each stile on its face.
• Stand back: look from across the room. Your eye will spot an uneven box faster than a tape measure.

Once the adhesive has set, fill the pin holes, run caulk along every joint and where the strips meet the wall, and smooth it with a wet finger. Sand the filler lightly when dry, prime any bare MDF (cut edges soak up paint), then paint the wall and panelling together in two coats. A satin or eggshell finish wipes clean and hides small imperfections better than gloss.

Quick checklist

• Check for cables and pipes before fixing anything
• Measure the width in several places and use the smallest
• Choose a height that lines up with sills or radiators
• Box width = (wall − (boxes + 1) × strip) ÷ boxes
• Mark every stile from the left-hand end of the wall
• Draw the top rail with a level, not from the floor
• Fit bottom rail, top rail, then stiles cut to fit
• Join rails on a stile’s centre line
• Check widths and diagonals, then fill, caulk, prime and paint

Measurements in this guide are a guide only. Check them on your own wall before you cut.