Kids and Nursery
Shared kids room layouts and dimensions
The second child costs about two and a half times their own mattress, and almost none of it is bed.
On this page (7 sections)
Short answer
Two singles side by side with an aisle between them need 100 in (2.55 m) of wall at the absolute minimum, which is 38 in of bed, a 24 in aisle and 38 in of bed. Allow 112 in (2.84 m) and the aisle becomes 36 in (91 cm), enough for one child to sit on the edge of a bed while the other walks past. Below 100 in the aisle stops being a route and the beds have to go end to end or into a bunk.
The numbers, at a glance
- Two beds parallel, minimum
- 100 in (2.55 m) of wall38 + 24 + 38 in; the UK twin bedroom width
- Two beds parallel, comfortable
- 112 in (2.84 m)36 in (91 cm) aisle between the beds
- Aisle between beds
- 24 / 30 / 36 in (61 / 76 / 91 cm)Squeeze, workable, two children sitting
- Beds end to end
- 150 in (3.81 m) of wallTwo 75 in beds, nothing between them
- US minimum for two occupants
- 100 sq ft (9.3 m2)IPMC: 50 sq ft per occupant over one
- UK twin bedroom minimum
- 11.5 m2 (124 sq ft)Nationally Described Space Standard
- Marginal cost of a second child
- 30 to 43 sq ft (2.8 to 4.0 m2)Against a bed footprint of 20 sq ft
- Divider height, lying
- 30 in (76 cm)Blocks the sightline between two pillows
- Hanging rod per child
- 24 to 36 in (61 to 91 cm)Child garments hang at about 1 in each
A shared bedroom is decided by one measurement, and it is not the area. It is the shorter clear wall, because that is what has to hold two mattress widths and whatever passes between them. Everything else in kids room and nursery dimensions can be shuffled. That number cannot.
Start at the short wall#
Measure the room across its narrower direction, wall face to wall face at mattress height rather than at skirting level, and subtract anything fixed: a radiator projecting 4 in (10 cm), a chimney breast at 12 in (30 cm), the door leaf where it stands open. What is left is the budget.
Two US twins or two UK singles are 38 in (97 cm) and 35.5 in (90 cm) wide. Set side by side against opposite walls with an aisle between them, the arithmetic is short:
- 38 + 24 + 38 = 100 in (2.55 m), the squeeze.
- 38 + 30 + 38 = 106 in (2.69 m), workable.
- 38 + 36 + 38 = 112 in (2.84 m), comfortable.
The room also has to be long enough: 75 in (191 cm) of bed plus 24 in (61 cm) at the foot is 99 in, so 8 ft 3 in (2.51 m), and a door swinging into that end pushes it to about 10 ft. Bed sizes in both systems, and which one a child of a given height still fits, are in kids bed sizes by age.
The five layouts, and the room each one needs#
| Layout | Short wall needed | Long wall needed | Floor area | What it costs |
|---|---|---|---|---|
| Parallel, 24 in aisle | 100 in (2.55 m) | 99 in (2.51 m) | 69 sq ft (6.4 m2) | No sitting on bed edges |
| Parallel, 36 in aisle | 112 in (2.84 m) | 108 in (2.74 m) | 84 sq ft (7.8 m2) | Two long walls used up |
| L-shape in a corner | 113 in (2.87 m) | 113 in (2.87 m) | 89 sq ft (8.3 m2) | One dead corner |
| End to end on one wall | 74 in (1.88 m) | 150 in (3.81 m) | 77 sq ft (7.2 m2) | Needs a 14 ft room |
| Bunk plus desks | 74 in (1.88 m) | 120 in (3.05 m) | 62 sq ft (5.8 m2) | 60 in of ceiling above the lower bunk |
Areas in that table are the beds plus their working clearance, not the whole room. A real room adds a wardrobe at 24 in (61 cm) deep, a desk at 24 in deep, and a route to the door that meets the 30 to 36 in (76 to 91 cm) in walkway and circulation widths at home.
The L-shape is the layout most people underrate. Two beds meeting at right angles in one corner need 113 in (2.87 m) in both directions, which a 10 x 11 ft room provides, and they leave two complete walls free for storage and a desk rather than one. The dead corner where the heads meet takes a corner shelf or a lamp table, and the two children get a physical separation of the full bed length without a divider.
Where the minimum sizes actually come from#
| Rule | Room for one | Room for two | Minimum width |
|---|---|---|---|
| IRC habitable room, US | 70 sq ft (6.5 m2) | 70 sq ft (6.5 m2) | 7 ft (2.13 m) |
| IPMC occupancy, US | 70 sq ft (6.5 m2) | 100 sq ft (9.3 m2) | Not stated |
| England, space standard | 7.5 m2 (81 sq ft) | 11.5 m2 (124 sq ft) | 2.15 m single, 2.55 m twin |
The English figures are worth taking apart, because they were reverse engineered from furniture and it shows. A twin bedroom width of 2.55 m is two 90 cm beds plus a 750 mm (29.5 in) aisle, to the centimetre. A double bedroom width of 2.75 m is a 135 cm bed plus 700 mm (27.5 in) of access on each side. These are not round numbers chosen for tidiness, they are a layout written as a dimension, which is why they hold up when you draw against them. Country by country comparisons are in minimum room size standards by country, and the general table for every room type is in standard and minimum room sizes.
Note what the US codes do not say. The IRC minimum of 70 sq ft with a 7 ft minimum dimension applies whether one child sleeps there or three. Only the property maintenance code, which governs occupancy rather than construction, adds the 50 sq ft (4.6 m2) per additional occupant. A newly built 70 sq ft bedroom is legal and will not hold two beds and an aisle: 70 sq ft at 7 ft wide is 10 ft long, and 7 ft is 84 in, which is two mattresses and 8 in.
The gap between two beds#
The aisle figure is set by knees, not shoulders. A seated child's knees project about 15 in (38 cm) forward of the mattress edge, so two children sitting on facing bed edges take 30 in (76 cm) of the aisle between them and a 36 in aisle leaves 6 in (15 cm) of air. At 30 in one can sit while the other passes sideways; at 24 in one has to move before the other can. The equivalent adult figures, and where the 30 in beside a bed comes from, are in bedroom clearances.
Separation is also visual, and the heights are lower than people expect. Two children lying down have their eyes roughly 6 in (15 cm) above the mattress, so about 24 in (61 cm) above the floor: a headboard, bookcase or panel 30 in (76 cm) high between the beds breaks that sightline completely. Blocking a seated sightline needs more. A ten year old sitting on a bed has their eye at roughly 42 in (107 cm) above the floor, so a divider has to reach 48 in (122 cm), which is the height of a low bookcase and about the limit before the room reads as two corridors.
Splitting the storage, not halving it#
Two children in one room need two of everything that is personal and one of everything that is not. The working allowances, which are our own recommendation rather than a published standard:
- Hanging rod: 24 to 36 in (61 to 91 cm) each. Children's garments hang at roughly 1 in (25 mm) apiece, so 30 in of rod is about 30 items.
- Drawers: three each, at 30 x 18 in (76 x 46 cm) internal or thereabouts.
- Open shelf: 36 in (91 cm) of run each, at 10 to 12 in (25 to 30 cm) deep.
- Floor bins: one 16 x 12 in (41 x 30 cm) bin each for toys, shared beyond that.
The efficiency comes from double hanging. Child clothes are 18 to 24 in (46 to 61 cm) long, so a wardrobe with rods at 36 and 72 in (91 and 183 cm) fits two tiers where an adult's long hang fits one. One 60 in (152 cm) wardrobe double hung yields 120 in (3.05 m) of rod, 60 in each, against 60 in total from the same width single hung. The heights that a child can actually reach, and when they change, are in kids closet and storage heights by age; the carcass sizes are in reach-in closet dimensions.
When the arithmetic forces a bunk#
Below about 100 in (2.55 m) across the short wall, two beds cannot sit parallel with a usable aisle, and below 150 in (3.81 m) on the long wall they cannot sit end to end. That is the point at which a bunk stops being a preference. The cost is vertical: about 60 in (152 cm) from the lower mattress to the underside of the upper bunk if the lower is to be sat in, plus the upper mattress, plus 30 to 36 in (76 to 91 cm) of clear headroom above it. The ceiling arithmetic and the guardrail heights are worked through in bunk bed dimensions and the ceiling height they need.
Before committing, tape the layout out at full size. A 44 in aisle drawn at 1:50 looks generous and reads quite differently on the floor with a wardrobe door open across it. The method is in taping out a layout at full size, and a quick numerical check on any bed and clearance combination is in the bedroom layout checker.
The layout that changes at ten#
Shared rooms usually get planned once and then last a decade, which is a mistake of about six years. The change is not size, it is sightline. Up to about age ten the two children want the same room with the same rod height and the same bed; after it, one of them wants a boundary, and the boundary that works is vertical and cheap.
Three moves, in order of how much floor they cost: turn a low bookcase end on between the beds, 12 in (30 cm) of depth for a 48 in (122 cm) high screen; swap one bed for a high sleeper with a desk beneath, which converts 20 sq ft of floor into 20 sq ft of desk at no plan cost; or split the wardrobe run so each child has a full-height door of their own rather than a share of one. None of those changes the room dimension, which is the point: the room was sized at the start for two beds and an aisle, and that number was fixed the day the short wall was measured.
Frequently asked questions#
What size room do two children need?
One hundred square feet (9.3 m2) in the US, where the property maintenance code allows 50 sq ft per occupant once a bedroom holds more than one; 11.5 m2 (124 sq ft) in England under the Nationally Described Space Standard, with a minimum width of 2.55 m (8 ft 4 in) for a twin. The US figure is an occupancy floor rather than a design target, and 110 to 130 sq ft is where a shared room stops feeling like a corridor.
How much space do you need between two beds?
Twenty four inches (61 cm) to walk between them, 30 in (76 cm) to make a bed without turning sideways, and 36 in (91 cm) before two children can sit on facing edges at once. That last figure comes from the knees: a seated child's knees project about 15 in (38 cm) from the mattress edge, so two sets of knees take 30 in and 36 in leaves six inches of air.
Is a bunk bed worth the floor it saves?
It saves about 20 sq ft (1.9 m2), which is one bed footprint, out of the 30 to 43 sq ft that a second child adds to a room. Storage, aisle and desk space are the rest and a bunk does not touch them. In practice a bunk buys back a desk and its chair pull-out, roughly 12 sq ft, and it costs 60 in (152 cm) of ceiling above the lower mattress.
What is the minimum width for a twin bedroom in the UK?
2.55 m (8 ft 4 in), against 2.75 m (9 ft) for a double. Both figures decompose neatly: 2.55 m is two 90 cm single beds plus a 750 mm aisle, and 2.75 m is a 135 cm double plus 700 mm of access on each side. The area minimum of 11.5 m2 applies to either, and there is a separate 2.3 m floor to ceiling requirement over most of the room.
How do you divide storage between two children?
By rod length and by drawer count, not by cupboard. Allow 24 to 36 in (61 to 91 cm) of hanging rod each and three drawers each. Because child garments are only 18 to 24 in (46 to 61 cm) long, one 60 in (152 cm) wardrobe double hung at 36 and 72 in gives 120 in of rod, which is 60 in each, more than two separate single-hung wardrobes of the same total width.
Can two beds go under one window?
Only if the window is not the escape opening, or if neither bed blocks it. The IRC requires an emergency escape and rescue opening in every sleeping room with a sill no more than 44 in (1,118 mm) above the floor. A top bunk in front of that window, or a headboard across it, defeats the requirement even though nothing in the room has changed size.
What age gap works in a shared room?
Layout, not age, is the constraint, but the practical break is around age ten, when a child wants a sightline blocked rather than a metre of floor. A panel or wardrobe 48 in (122 cm) high separates two seated children; 30 in (76 cm) is enough to separate two lying down. Below about a four year gap the same bed size and the same rod height work for both, which keeps the room symmetrical.
How long a wall do two beds end to end need?
One hundred and fifty inches (3.81 m) of clear wall for two 75 in singles head to head, and 168 in (4.27 m) if a shared chest or nightstand goes between them. That is a room 14 ft long, which is why the arrangement is rare outside converted loft rooms and why the parallel layout, needing only 100 in across, wins in almost every standard bedroom.
Sources and standards referenced#
- Technical housing standards: nationally described space standard UK Ministry of Housing, Communities and Local GovernmentTwin bedroom minimum of 11.5 m2 and 2.55 m width, single bedroom 7.5 m2
- International Property Maintenance Code, section 404 International Code CouncilFifty square feet per occupant where a bedroom holds more than one person
- International Residential Code, sections R304 and R310 International Code CouncilHabitable room minimum area, and the escape opening and 44 in sill height
- Architects' Data Ernst Neufert, Wiley-BlackwellBed layouts, aisle widths and children's bedroom planning figures
- Human Dimension and Interior Space Panero and Zelnik, Watson-GuptillSeated knee projection and circulation widths behind a seated person
We cite published codes, industry planning guidelines and manufacturer specifications. Where a figure is our own recommendation rather than a published standard, the text says so. See how we measure.