Which SketchUp versions does it run on?

Desktop SketchUp 2021 through 2026 - the extension declares its supported range as 2021..2026 and installs as an .rbz from Extension Manager. Older versions and the browser-based free version are out, because it needs the Ruby API. Everything works the same in Pro and non-Pro desktop installs except the stairwell slab cut, which relies on Pro's solid tools. Interface in Turkish and English.

Is there a licence key, activation or online check?

No. The licence layer was deliberately removed in v1.0.2, so there is no key to enter, no activation server to reach and nothing that phones home - install the .rbz and it works offline. Updates arrive as new builds; 13 have shipped so far, v1.0.0 through v1.0.12. The $35 is a suggested price while the extension is in beta.

What are the honest limits right now?

It is beta, so four things are worth knowing. The stairwell opening uses SketchUp Pro's solid tools - without Pro the stair still builds, the slab just stays closed. Menu titles only pick up a language change after SketchUp restarts. The MP4 export needs ffmpeg on the machine; without it you get the pure-Ruby AVI fallback. And the rule set is written to Turkish regulations plus TS 9111, DIN 51130 and EN 1991-1-1, so outside Turkey treat the badges as a sanity check rather than a stamp of approval.

StairFun StudioDon’t Lose Time on Stair Maths: Enter the Floor Height and Draw a Code-Compliant Stair Instantly

Instead of counting risers, you type the floor height and get back to design. Pick a form, click a start point and a direction, type the floor height. Structure, railing, labels and the R-code report come out as one editable component.

8 forms + ramp
44 live code rules
30 risers under 1 s

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SketchUp 2021 · SketchUp 2022 · SketchUp 2023 · SketchUp 2024 · SketchUp 2025 · SketchUp 2026 · v1.0.12

Left: the job by hand. Right: the same job with the plugin.

StairFun Studio

Every feature, at a glance

What the plugin does for you, drawn rather than listed.

Straight to spiral, ramp included

Straight, L and U turns, spiral, circular, cantilevered, fire escape and an accessible ramp; each one is a card you click, not a setting to hunt for.

Two clicks, a finished stair

The first click sets the start, the second the direction, then you type the floor height; treads, stringer, railing and labels arrive as one component.

44 code rules, live as you draw

Forty-four code rules run live while you set the stair; anything off turns red or yellow, and one click brings it back into line.

Landings and headroom, handled

Past 16 risers an intermediate landing goes in on its own, and 2100 mm of headroom is checked with the slab thickness taken into account.

Five structural systems

Sloped concrete slab, steel stringer, timber, a wall cantilever on hidden steel sleeves or a single spine, with five finishes and five railing types.

Report, cut list, assembly video

A print-ready report with the code table, riser schedule and cut list, a CSV cut list and a 9:16 assembly animation out as MP4.

Workload test

99% less work with StairFun Studio

By handCounting risers, then drawing every tread by hand

1 h 15 m

With StairFun StudioPick a form, click twice, type the floor height

40 sec

99%

less time on this job

113×

faster

The time the same job takes by hand and with the plugin; the share and the speed-up are worked out from those two times.

The same job: your hours, or the plugin’s seconds?

Drag me

With the plugin

40 sec

Pick a form, click twice, type the floor height

By hand

1 h 15 m…

Counting risers, then drawing every tread by hand

Drag me

01
Two Clicks, a Finished Stair
Start point, direction, floor height in the VCB. Treads, stringer, railing and numbered labels arrive as one component. No drawing treads one by one.
02
No Need to Memorise the Code
You design, it watches the code: 44 rule IDs run live while you set the stair. Anything off turns red or yellow, and one click pulls it back into line.
03
A Change Is One Number Away
Reopen the component, change one number, and the stair rebuilds in a single Ctrl+Z. Riser schedule and cut list export themselves, so nobody types the shop list by hand.

How many evenings could this give you back?

stairs per project

Projects per month4Hours on this task, per project2hours

Estimate based on a typical workflow. Your mileage will vary - usually upward.

Saved every month

0,0hours

Saved every year

0 hours

0 work days

You just found 77 hours of your life.

Not on sale yet

The technical bit

For the people who read the manual first.

Works with: SketchUp 2021 · SketchUp 2022 · SketchUp 2023 · SketchUp 2024 · SketchUp 2025 · SketchUp 2026
Version: v1.0.12
Interface languages: tr · en

Eight stair forms plus an accessible ramp: straight, L-turn, U-turn, centre-spine spiral, curved-stringer circular, cantilevered/floating and fire escape - each a card you click, not a setting you hunt for.
Regulation engine with 44 rule IDs in the R-01..R-73 range, written to Planli Alanlar Imar Yonetmeligi Md.32/36, TS 9111, BYKHY, DIN 51130, EN 1991-1-1 and TBDY; red and yellow badges appear as you type, and one click makes the stair compliant.
Calculator core solves n = ceil(H/a_max), a = H/n, b = 630 - 2a, drops an intermediate landing automatically past 16 risers, and checks 2100 mm stairwell headroom while solving slab thickness.
Eight building-class presets - villa, housing, public, with lift, accessible, fire, exterior, service - each swapping the limits the engine enforces.
Winder engine with three profiles (pole, quarter-circle, proportional) that never lets the inner tread edge fall under 100 mm and raises the winder count from 8 to 12 on its own.
Five structural systems (RC sloped soffit at t = max(120, L/25), steel stringer, timber, wall-anchored cantilever with a hidden steel sleeve, single-spine mono-stringer), five finishes and five railing types, including the 700/900 double handrail for the accessible class.
Placement happens in the model: first click sets the start, second the direction, Tab flips the side, arrows change the turn, the VCB takes the floor height, and the upper slab is detected for H.
Identical parts are deduplicated into shared component definitions by MD5 signature, so editing one tread updates every matching tread - and a parameter change regenerates the whole stair in one Ctrl+Z.
HTML print report (R-code compliance table, riser schedule, cut list, engineering notes), CSV cut-list export, and a 9:16 assembly animation rendered to H.264 MP4 through ffmpeg with a pure-Ruby MJPEG-AVI fallback.
No external gems: its own pure-Ruby solid kernel and zip builder, a 30-riser stair with railing solids in under a second, 114 tests green, and a built-in error console logging to Plugins\stairfun_log.txt.

Still being built

Shipped, and what is next.

Shipped

Phases 0-10 complete: eight stair forms, the accessible ramp and all five structural systems build from the panel
Regulation engine live in the model - 44 R-codes badged as you change a parameter, with a one-click compliance fixer and eight building-class presets
Parts became real geometry: shared component definitions by MD5 signature, connection fittings, per-tread edge chamfer and the mono-stringer spine (v1.0.12)
9:16 assembly animation with a constant-speed 360 degree orbit, H.264 MP4 through ffmpeg and a pure-Ruby AVI fallback, rendered asynchronously with progress and cancel
Licence layer removed in v1.0.2, built-in error console with a log file next to the plugin, 114 tests green across calc, gen and build specs

Own solid-boolean stairwell cut, so the slab opening works without SketchUp Pro's solid tools
Menu and toolbar titles that switch language without restarting SketchUp
Rule presets for codes outside Turkey, and a third interface language alongside Turkish and English

Before you ask

Desktop SketchUp 2021 through 2026 - the extension declares its supported range as 2021..2026 and installs as an .rbz from Extension Manager. Older versions and the browser-based free version are out, because it needs the Ruby API. Everything works the same in Pro and non-Pro desktop installs except the stairwell slab cut, which relies on Pro's solid tools. Interface in Turkish and English.
No. The licence layer was deliberately removed in v1.0.2, so there is no key to enter, no activation server to reach and nothing that phones home - install the .rbz and it works offline. Updates arrive as new builds; 13 have shipped so far, v1.0.0 through v1.0.12. The $35 is a suggested price while the extension is in beta.
It is beta, so four things are worth knowing. The stairwell opening uses SketchUp Pro's solid tools - without Pro the stair still builds, the slab just stays closed. Menu titles only pick up a language change after SketchUp restarts. The MP4 export needs ffmpeg on the machine; without it you get the pure-Ruby AVI fallback. And the rule set is written to Turkish regulations plus TS 9111, DIN 51130 and EN 1991-1-1, so outside Turkey treat the badges as a sanity check rather than a stamp of approval.