Measuring in Millimeters: Avoiding Common Dimension Mistakes Before Ordering Your Stair Kit
Ordering a stair you’ll love starts with one deceptively simple step: measuring in millimeters. Tiny unit mix-ups can lead to big on-site headaches—tight fits, gaps, or last‑minute adjustments you didn’t plan for. This guide shows you exactly what to measure, where errors creep in, and how to submit rock‑solid dimensions so your ready‑to‑assemble kit fits first time.
You’ll learn the critical measurements every stair project needs, the most common mistakes (and how to avoid them), and when to lean on our self‑measurement guide or professional Inmeetservice for peace of mind.
Why millimeters matter for a perfect‑fit stair kit
A wooden stair kit is custom‑made around your sizes. Components—stringers, treads, and risers—are supplied pre‑cut to your dimensions, so accuracy upfront pays off on installation day. Pine (spruce) kits are pre‑drilled to speed assembly, and every kit includes the fixings and a step‑by‑step manual so you can install it yourself or hand it to your contractor.
Accurate, millimeter‑precise measurements also help ensure your design aligns with Dutch (and Belgian) building regulations for proportion, headroom, and usability. Our staircases are engineered to meet the applicable standards, and our team can review your specifics to help ensure the installed result complies.
If you prefer expert help, book the professional Inmeetservice. Prefer DIY? Use the step‑by‑step “how to measure” guidance and submit your sizes through the online Stair Configurator.
The core dimensions you must capture (in millimeters)
Measure all sizes in millimeters (mm) and record them clearly.
| Dimension | What it means |
|---|---|
| Floor‑to‑floor height | Vertical distance from finished lower floor to finished upper floor |
| Stairwell opening (length × width) | The clear size of the floor opening that the stair passes through |
| Headroom | Vertical clearance along the stair’s walking line under ceilings/beams |
| Available run/footprint | The horizontal space the stair can occupy on the lower floor, including turns |
| Intended stair width | The clear width you want for the stair itself |
| Landings/turns | Any upper/lower quarter‑turns, half‑turns, or landings that affect layout |
| Finish thicknesses | Floor coverings, underlays, and ceiling finishes that change final sizes |
Tip: Note obstacles (doors, radiators, beams, services) and wall conditions (plumb/level). Add photos to your dimension sheet for clarity.
10 common mistakes when measuring in millimeters—and how to avoid them
1) Mixing units (cm/inch/mm)
- Problem: Conversions or mixed units cause expensive misfits.
- Fix: Set all tools and notes to millimeters. Write “mm” next to every figure.
2) Rounding or estimating
- Problem: Rounded dimensions accumulate into noticeable errors.
- Fix: Record exact readings. Re‑measure key sizes and confirm they match.
3) Measuring floor‑to‑ceiling instead of floor‑to‑floor
- Problem: Floor‑to‑ceiling ignores upper floor thickness and finishes.
- Fix: Always measure finished floor‑to‑finished floor height.
4) Forgetting finish thickness
- Problem: Adding flooring or plaster later changes final dimensions.
- Fix: Include planned finishes (floors, underlays, plaster/ceilings) in all measurements.
5) Assuming openings are square and walls are plumb
- Problem: Real‑world variations lead to tight spots or gaps.
- Fix: Measure opening length and width at multiple points and compare. Check diagonals for squareness.
6) Ignoring headroom and obstructions
- Problem: Low beams or soffits reduce safe clearance.
- Fix: Map the ceiling profile and verify headroom along the stair’s walking line.
7) Overlooking trims, skirting, or services
- Problem: Skirting boards, pipes, or cables interfere with stringers.
- Fix: Note all projections on drawings and allow space for them.
8) Measuring to raw structure when finishes are coming later
- Problem: Plasterboard or cladding narrows the opening after measuring.
- Fix: Measure to the final, finished surfaces—or add the exact finish thicknesses.
9) Sending unclear sketches
- Problem: Ambiguity slows design and risks misinterpretation.
- Fix: Use a clean plan with labeled views, arrows, units, and photos. Our online Stair Configurator helps standardize inputs.
10) Skipping a regulation sense‑check
- Problem: Non‑compliant proportions, widths, or headroom can derail the project.
- Fix: Note your rise/run targets and headroom. Our designs are engineered to comply with applicable regulations; share all site constraints so we can advise.
Step‑by‑step measuring checklist (ready to print)
- Set your tape/laser and notes to millimeters only.
- Record floor‑to‑floor height (finished lower to finished upper floor).
- Measure stairwell opening length and width at least twice (and compare). Check diagonals.
- Map headroom along the intended walking line; note any beams/soffits.
- Mark the available footprint on the lower floor, including turns or landings.
- Choose your intended stair width (consider walls, trims, and balustrades).
- List all finish thicknesses (flooring, underlay, plaster/ceiling) that affect sizes.
- Photograph the opening, surrounding walls, and any obstructions.
- Create a simple plan and side elevation with labeled mm dimensions.
- Enter sizes in the Stair Configurator or book the Inmeetservice for a professional site measure.
Tools and techniques for accurate millimeter measurements
- A quality tape or laser measurer for long spans
- A spirit level and square to verify level/plumb and squareness
- A straightedge or string line for headroom checks along the stair’s path
- A notepad or digital form with “mm” pre‑labeled on every field
- Duplicate measurements on critical sizes and a quick cross‑check before submission
Submitting your dimensions and planning your order
- Use the online Stair Configurator to enter dimensions, wood species, and style elements for a tailored quotation.
- Prefer expert verification? Book the Inmeetservice. If you want full support through installation, ask about the combined Inmeet‑ & Montageservice.
- Explore the self‑measurement guide (how to measure a stair) for step‑by‑step instructions.
- Check current delivery times on the "De actuele levertijd vindt u hier" link. Stock stair kits can deliver within one working week; custom‑made stairs typically take about 4–8 weeks depending on design and workload. A Spoedservice (rush service) is available on request.
- Our staircases are designed and manufactured in line with Dutch building regulations (Bouwbesluit) and engineered for safety and usability. Share site details early so we can adapt the design if needed.
- Expect a well‑organized delivery: kits arrive as protected components—stringer sections, bundled treads/risers, and all fixings—ready to carry inside and assemble on site.
Related topics you can explore on our site:
- How to measure your stair opening (self‑measurement guide)
- Werkwijze (our process from design to delivery)
- Houtsoorten (wood species), including hardwood options like oak
- Balustrade for your stair, guard rails for floor openings (hekwerken)
- Accessories such as stair paint, LED stair lighting, anti‑slip strips, and built‑in stair drawers
- Levertijd & verzendkosten, Retourneren, and Algemene voorwaarden
Quick answers: common measurement questions
What should I measure first for a stair kit?
Start with finished floor‑to‑finished floor height in millimeters, then the stairwell opening (length × width), headroom along the walking line, available footprint, and intended stair width.
Should I measure in millimeters or centimeters?
Measure in millimeters only. It eliminates rounding errors and aligns with our configuration and production process.
Can you measure for me?
Yes. Our Inmeetservice sends a specialist to measure your space accurately. You can also arrange the combined Inmeet‑ & Montageservice for measurement and installation.
Do kits arrive pre‑cut and ready to assemble?
Yes. Stringers, treads, and risers are pre‑cut to your provided dimensions and supplied with all required fixings and a step‑by‑step assembly manual. Pine (spruce) kits are pre‑drilled to simplify alignment.
Do your staircases meet building regulations?
Yes. Our staircases are designed and manufactured to meet applicable Dutch (and Belgian) building regulations for dimensions, safety, and usability.
Can I install the staircase myself?
Yes. Our ready‑to‑assemble kits are designed for self‑installation or fitting by your contractor.
Practical takeaways
- Always measure in millimeters and label every figure “mm.”
- Capture floor‑to‑floor height, opening size, headroom, footprint, and intended stair width.
- Include all finish thicknesses and note obstructions.
- Double‑check critical measurements and add clear sketches/photos.
- Use the Stair Configurator for a fast, accurate quotation—or book the Inmeetservice for professional measurement.
Conclusion: measure with confidence, order with certainty
Precise measuring in millimeters is the fastest path to a stair kit that fits perfectly and installs smoothly. Whether you follow the self‑measurement guide or prefer our Inmeetservice, you’ll set your project up for success—from design and compliance to delivery and assembly.
Ready to move forward?
- Start in the Stair Configurator to request your tailored quotation.
- Book the Inmeetservice if you want a specialist to measure on site.
- Have questions? Call +31 348 43 41 89 or email info@houtentrappenwinkel.nl.
Design it right, measure in millimeters, and enjoy a staircase that looks great and performs beautifully.