Understanding Dutch Building Code Requirements for New-Build Stairs (Bouwbesluit)

Planning a staircase for a new home? Getting the specs right the first time saves redesigns, delays, and cost. This guide breaks down the key Dutch Building Code Requirements for New-Build Stairs so you can design a stair that is safe, comfortable, and compliant—without guesswork.

You’ll learn the required dimensions for width, tread depth and riser height, flight height and landings, headroom, handrails and balustrades. You’ll also see how to apply the stair formula for comfort, the difference between new-build and existing homes, and practical tips to move from measurement to a build-ready plan.

Key new-build stair requirements at a glance

Below is a concise summary of essential Bouwbesluit rules for new-build stairs.

Featured answer: What is the minimum width for new-build stairs in the Netherlands? The minimum clear width is 80 cm.

Width, climb line, and walk zone explained

A compliant stair is not only wide enough, it also reserves safe space for footfall.

• Width: New-build stairs must be at least 80 cm wide, measured between the outside faces of the stringers.
• Climb line (klimlijn): The line connecting the nosings (front edges) of the treads. It must lie at least 30 cm from each side of the stair.
• Walk zone (loopgebied): The usable walking area between climb lines. This must be at least 20 cm. On a minimum-width stair of 80 cm, this yields the typical layout of 30 cm + 20 cm + 30 cm.

Featured answer: How is walk zone measured? It’s the clear distance between the two climb lines, which must be at least 20 cm.

Treads, risers, and the comfort formula

Two dimensions largely determine how a stair feels underfoot:

• Tread depth (aantrede): minimum 22 cm.
• Riser height (optrede): maximum 18.8 cm.

To balance safety and comfort, use the widely adopted stair formula:

• 2 × riser + 1 × tread = 570–630 mm

This range aligns with an average natural step length. Example:

• If your riser is 175 mm (17.5 cm), then 2 × 175 = 350 mm.
• To reach the minimum comfort sum of 570 mm, your tread must be 220 mm (22 cm): 570 − 350 = 220.
• To reach the maximum sum of 630 mm, your tread can be up to 280 mm (28 cm): 630 − 350 = 280.

A tread between 220–280 mm paired with a 175 mm riser meets the new-build rules and feels natural to climb.

Featured answer: What is the minimum tread depth for new-build stairs? 22 cm. What is the maximum riser height? 18.8 cm.

Flight height, landings, and headroom

• Maximum height per flight: The distance from the top of the lower floor to the top tread may be no more than 4.0 m. Taller stairs require an intermediate landing.
• Landing size: A required landing must be at least 80 × 80 cm.
• Headroom (doorloophoogte): Measure from the climb line straight up to the ceiling or obstruction. You need at least 230 cm of clear headroom.

Featured answer: When is a landing required? When a single flight exceeds 4.0 m in height; the landing must be at least 80 × 80 cm.

Handrails, balustrades, and safety details

Handrails

• If your stair is higher than 1 m, a handrail is mandatory.
• Position the handrail 80–100 cm above the tread nosing line.

Balustrades and guards

• On stairs (new-build): A balustrade (guard) is required from 1 m stair height. The minimum guard height along the stair is ≥ 0.85 m.
• On floors/edges: Where the guard is positioned 1 m above the floor, its height must be ≥ 100 cm.
• Spindle spacing: Openings in a stair guard may be no larger than 10 cm.

These measures work together to reduce fall risk while keeping the stair comfortable to use.

New-build vs. existing homes: what changes?

Bouwbesluit rules are stricter for new-build than for existing dwellings:

• New-build: tread ≥ 22 cm, riser ≤ 18.8 cm (plus other rules above).
• Existing homes: more lenient—tread ≥ 13 cm, riser ≤ 22 cm.

This difference matters when choosing products:

• Ready-made kit stairs are typically sized for existing homes.
• For new-build compliance, opt for a custom staircase designed to meet the stricter dimensions.

If you’re weighing options, explore related topics like a straight "steektrap" for simplicity, a landing ("bordes") for resting and passing, or a compact turn/spiral where space is tight.

Step-by-step compliance checklist

Use this sequence to move from concept to compliant design.

1. Measure the height to be bridged (floor-to-floor) and note the space available for the stair’s horizontal run.
2. Target a stair angle within 30°–70°, balancing comfort and available space.
3. Determine riser count by dividing total height by a candidate riser (keep each riser ≤ 18.8 cm for new-build).
4. Set tread depth so each tread is ≥ 22 cm, then validate comfort using 2R + T = 570–630 mm.
5. Check width: ensure a clear ≥ 80 cm, and reserve the walk zone: climb line ≥ 30 cm from both sides with ≥ 20 cm between climb lines.
6. Verify headroom: achieve ≥ 230 cm from the climb line to the ceiling or obstruction.
7. Assess flight height: if over 4.0 m, add a landing of ≥ 80 × 80 cm.
8. Specify handrails: required if the stair is > 1 m high; set top height at 80–100 cm.
9. Design guards: on stairs (new-build) ensure guard ≥ 0.85 m; on floor edges at 1 m height ensure guard ≥ 100 cm; keep spindle gaps ≤ 10 cm.
10. Finalize details: choose open or closed risers, materials, and finishes that fit your interior and maintenance needs.

Practical design tips

• Apply the stair formula early: Starting with 2R + T = 570–630 mm helps prevent late-stage conflicts between comfort and code minimums.
• Plan for headroom under sloped roofs: For attic access, position the stair to arrive where the roof is higher, or use a quarter-turn or spiral to gain headroom efficiently.
• Consider a landing for usability: Besides being required over 4.0 m, a landing (bordes) makes passing safer and adds a visual pause.
• Handrail lengths made simple:
  • Straight runs: measure wall length from first to last tread and add 20–30 cm for comfortable approach.
  • Quarter-turns: use two handrails; shorten each by 12 cm to avoid collisions at corners, then optionally add 10–15 cm approach.
  • Double-quarter: the middle rail is 24 cm shorter overall (12 cm each end); adjust end rails similarly.
• Expect initial creaks: New wooden stairs can creak at first as the timber acclimates to humidity and temperature. Sounds typically fade as the stair "settles."

Quick answers (for featured snippets)

• Minimum width (new-build): 80 cm.
• Minimum tread depth: 22 cm.
• Maximum riser height: 18.8 cm.
• Required headroom: 230 cm from climb line.
• When is a landing required? When a flight exceeds 4.0 m; landing ≥ 80 × 80 cm.
• Handrail: required if stair > 1 m; height 80–100 cm.
• Balustrade on stairs (new-build): required from 1 m; guard ≥ 0.85 m; spindle gaps ≤ 10 cm.
• Stair angle: 30°–70°.

How Houtentrappenwinkel.nl helps you build it right

• Custom new-build stairs: We design and manufacture made-to-measure stairs that meet Bouwbesluit dimensions and your aesthetic goals.
• In-measure service: On-site measurement available for €165 within a 100 km radius of Utrecht.
• Professional installation: Installation service available within 100 km of Utrecht; our stairs ship as predrilled components with included fasteners for smooth assembly.
• Delivery: We deliver throughout the Netherlands (except the islands) and Belgium; delivery fee €75 incl. VAT.
• Kit vs. custom: Our kit stairs suit existing homes; for new-build compliance, choose bespoke (maatwerk).

Looking for specifics on balustrades, straight "steektrappen," measuring your stair, or board-and-landing designs? Explore our guides on balustrades, how to measure a staircase, straight stair options, and landing (bordestrap) advantages for deeper planning insight.

Conclusion

Designing a compliant new-build stair becomes straightforward when you anchor every decision to the Dutch Building Code Requirements for New-Build Stairs: width ≥ 80 cm, tread ≥ 22 cm, riser ≤ 18.8 cm, headroom ≥ 230 cm, with landings, handrails, and guards specified precisely.

Ready to turn measurements into a safe, elegant staircase? Contact Houtentrappenwinkel.nl for tailored advice, our in-measure service, and a custom design that meets Bouwbesluit—and your vision—perfectly.