BS EN 1729 Explained: The Complete Guide to School Furniture Sizing

BS EN 1729 is the British and European standard that specifies the dimensions for chairs and tables used in educational settings. If you are ordering classroom furniture for a UK school, this is the standard your furniture should meet — and understanding it will help you order the right sizes the first time.

What is BS EN 1729?

BS EN 1729 is published in two parts. Part 1 covers functional dimensions — the heights, depths and widths that chairs and tables must conform to for each size class. Part 2 covers safety requirements and test methods. Together they define what a compliant piece of educational furniture looks like at each size, from Reception-age children up to adults.

The standard replaced the older British Standard BS 5873 and aligns UK educational furniture with the broader European EN 1729 standard. Most reputable UK school furniture manufacturers design to BS EN 1729 as a baseline.

The BS EN 1729 size chart

BS EN 1729 defines seven size classes, numbered 1 through 7 (though Size 1 is rarely encountered outside specialist early years settings). Each size class corresponds to a pupil height range and a recommended seat height.

Size	Pupil height range	Approximate age	Seat height	Table height
Size 1	80–95 cm	Under 4	21 cm	40 cm
Size 2	93–116 cm	3–6	26 cm	46 cm
Size 3	108–121 cm	5–8 (KS1)	31 cm	53 cm
Size 4	119–142 cm	8–11 (KS2)	35 cm	59 cm
Size 5	133–159 cm	11–14 (KS3)	38 cm	64 cm
Size 6	146–176 cm	14–adult	43 cm	71 cm
Size 7	159+ cm	Adult	46 cm	76 cm

Note that age ranges are approximate guides. The standard is based on pupil height, not age, so a tall Year 4 class might be better served by Size 5 chairs than Size 4. Where you have a mixed-height class, it is generally better to err towards the larger size — a child sitting slightly too high can compensate by adjusting posture more easily than one sitting too low.

Which size do most primary schools order?

In practice, most UK primary schools standardise on one or two sizes across the school rather than buying per-year-group. The most common combinations are:

Reception and Year 1: Size 2 or Size 3 depending on cohort height. Size 2 is appropriate for most Reception children; Size 3 from Year 1 onwards.

Years 2–6: Size 3 throughout, or Size 3 for lower KS2 and Size 4 for upper KS2. Many schools use Size 3 for the whole primary age range for simplicity.

Year 6 and secondary transition: Size 4 is the standard for upper KS2. Secondary schools move to Size 5 and Size 6 depending on year group.

Tables and chairs must be matched

The standard specifies chair and table heights as a pair — buying Size 3 chairs with Size 4 tables creates an ergonomic mismatch that forces children to sit in an awkward posture for sustained periods. When ordering, always specify both chairs and tables at the same size class.

Does all school furniture have to meet BS EN 1729?

BS EN 1729 is not a legal requirement in UK schools, but it is widely referenced in procurement specifications and is considered best practice. DfE building bulletins and local authority furniture frameworks typically require compliance. If you are buying furniture through any public sector framework — ESPO, YPO, CPC, or a local authority contract — compliance with BS EN 1729 is almost always specified.

All classroom furniture sold by OWL School Furniture is UK-manufactured and meets BS EN 1729. If you need a formal declaration of conformity for a procurement submission, contact us at info@owlschoolfurniture.co.uk.

Ordering on a Purchase Order

All registered UK schools can order classroom furniture from OWL on a Purchase Order with instant credit — no upfront payment required. Standard lead time is approximately 28 days. Call 0330 133 8155 if you would like advice on sizing before you order.