Gallery wall spacing and layout

The gap, and why it must not vary#

Frame size	Gap	Effect
Under 12 in (30 cm)	1.5 to 2 in (4 to 5 cm)	Reads as one dense block; anything wider dissolves the group
12 to 24 in (30 to 61 cm)	2 to 3 in (5 to 8 cm)	The default for almost every domestic gallery wall
24 to 30 in (61 to 76 cm)	3 in (8 cm)	Gap grows with the frames or the group looks crowded
Over 30 in (76 cm)	3 to 4 in (8 to 10 cm)	Each piece keeps some independence
Mixed sizes	Set by the smallest pair	One gap for the whole wall, chosen from the tightest junction

The gap is the only dimension in a gallery wall you get to choose freely, and it is the one that decides whether the group reads as an object or as clutter. Below about 1.5 in (4 cm) the frames touch visually and the mouldings fight. Above about 4 in (10 cm) the group dissolves into separate pictures, at which point you are hanging individual works and the art hanging height rules apply to each of them instead.

Treat the group as one rectangle#

Every layout decision uses the outer rectangle, not the individual frames.

• Width = sum of the frame widths in the widest row + the gaps between them.
• Height = sum of the frame heights in the tallest column + the gaps between them.
• Centre the rectangle on 57 in (145 cm), unless the furniture below pushes it up.
• Span about two thirds of the furniture below, and never wider than the furniture.
• Hold 6 to 10 in (15 to 25 cm) above the furniture, 8 to 12 in (20 to 30 cm) below the ceiling or cornice, and 8 to 12 in from any door casing, window casing or corner.

Those clearances are not decoration. A group that comes within 4 in (10 cm) of a door casing reads as an accident of fit, and one that runs into the cornice makes the ceiling look lower, for the reasons set out in ceiling height and proportion.

The three layouts, with dimensions#

Layout	Structure	Typical dimensions	Best for
Grid	Equal frames, equal gaps, rows and columns aligned	3 x 3 of 14 x 11 in (36 x 28 cm) at 2.5 in (6 cm) gaps = 47 x 38 in (119 x 97 cm)	Series, prints, photographs, anything you want to look calm
Salon	Mixed sizes around a common centre, gaps constant	Outer rectangle 48 to 72 in (122 to 183 cm) wide, 40 to 60 in (102 to 152 cm) tall	Genuinely mixed collections, tall walls, stairwells
Linear	One row, centres on a single line	3 to 5 frames, 20 to 30 in (51 to 76 cm) tall, centres at 57 in (145 cm)	Corridors, above a long console, narrow walls
Column	One vertical stack	2 to 3 frames, group 30 to 50 in (76 to 127 cm) tall	Between windows, beside a door, narrow piers

In a salon hang, pick one organising line and hold it absolutely: a common horizontal centre, a common top edge, or a common baseline. The version that fails is the one organised around nothing, where every frame relates only to its neighbours and the errors accumulate outward.

A worked 9-frame grid#

The paper template method#

This is the only reliable way to hang a group, and it takes about 40 minutes.

1. Cut kraft paper or newspaper to the exact outside size of each frame. Write the frame's name on it.
2. On each template, mark the hook position: measure down from the top edge by that frame's taut wire drop, and across to the centre (or to each of two hooks, 8 to 12 in / 20 to 30 cm apart).
3. Pencil a light datum line on the wall at the group's top edge, using a level or a laser, and a vertical centre line.
4. Tape the top row to the datum with low-tack tape, holding the chosen gap with an offcut of timber cut to exactly 2.5 in (6 cm). Use the block, not a tape measure, at every junction.
5. Work down row by row, using the same block for the vertical gaps.
6. Step back to the doorway and to your usual seat. Adjust the whole group up or down as one, not frame by frame.
7. Drive the hook or anchor through the paper at the marked point, then tear the paper away.

The timber offcut is the important part. Measuring 2.5 in nine times produces nine slightly different results; one block produces one result.

Same frames or mixed#

A single frame size and colour makes the content the variable, which is the right choice for photographs, botanical prints or anything you may add to later. It is also the forgiving option: a grid of identical frames tolerates being off centre far better than a mixed group does.

Mixed sizes need a rule to hold them together, usually one of: a constant frame colour and moulding width, a constant mat width, or a constant gap with aligned outer edges. Two of the three is comfortable. None of the three is the wall people quietly take down after a year.

Keep the largest piece off centre by design rather than by accident, and mind the 1.5 times dominance test: if the largest frame is not clearly bigger than the second largest, the group has no anchor and reads as random.

Stairs, corners and door casings#

Stairs. Establish the pitch line first: measure 57 in (145 cm) up from the nose of two treads several steps apart, mark both, and snap a chalk line between them. Every frame centres on that line. Gaps are measured perpendicular to it. Frame tops and bottoms stay horizontal, so the group steps up as a staircase itself, which is correct. Related geometry is in stair dimensions.

Corners and casings. Stop 8 to 12 in (20 to 30 cm) short of an internal corner, a door casing or a window casing. Groups that wrap a corner almost never work: the second wall is at a different angle to the viewer and the gaps read as different sizes even when they are not.

Above a mantel. Use 4 to 8 in (10 to 20 cm) above the shelf and keep the group inside the width of the chimney breast, not the fire opening. The fireplace and TV wall page covers what happens when a screen is also in play.

Setting it out in the right order#

1. Measure the furniture width and the wall, and set the group width at about two thirds of the furniture.
2. Calculate the usable vertical band: furniture back + 8 in at the bottom, ceiling minus 12 in at the top.
3. Choose the number of rows, then derive the maximum frame height from the band. Do not choose frames first.
4. Fix the gap once, cut a timber block to it, and never measure a gap again.
5. Lay the whole thing out on the floor to the exact dimensions before you cut a single template.
6. Mark hooks per frame from its own wire drop, using the art hanging height calculator if you would rather not do the arithmetic by hand.