H-Series Extension Kit
H-Series · Solid Wood & Sisal — The system grows. With your cat.
H-Series Extension Kit
H1 - H4
Modular system
30 kg
Per platform
Beechwood
Solid wood + multiplex
MUSE 2025
Design Award
Real Home
That's no compromise.
H3 · Black
H3 · Black
Materials
Every material has a reason.
Sisal, beech wood, and wool felt – consciously chosen, designed for longevity.
Sisal
Sisal embodies resilience. Derived from the leaves of the agave – long-lasting, robust, naturally coarse. Exactly what cats need. Exactly what outlasts furniture.
100% natural material
Beechwood
Beech stands for durability. Solid wood substructure, multiplex platforms – stable, low-maintenance, timeless. From sustainable forestry in Europe.
Solid & Plywood
Wool felt
Wool felt offers softness. Made from pure new wool, breathable and temperature-regulating. Certified according to OEKO-TEX® Standard 100.
OEKO-TEX® 100@HTREESTUDIO
How an H-tree is created.
From Berlin. At home everywhere.
Frequently Asked Questions
Everything you want to know.
Model & Dimensions
→ Not sure? Measure the ceiling height, then decide.
Assembly & Stability
Material & Sustainability
Delivery & Returns
H1 · The Sanctuary
120 cm · 1 platform
Entry into the system. Compact, expandable, for every room.
H2 · The Companion
170 cm · 2 platforms
Two levels. Fits into any apartment with a standard ceiling.
H3 · The Explorer Bestseller
220 cm · 3 platforms
Three levels for active climbers. In Germany, any space taller than 230 cm is considered living space - so the H3 fits everywhere.
H4 · The Visionary
270 cm · 4 platforms
Statement piece. For rooms 270 cm and taller — and cats who claim every inch.
The H-Tree uses height, not floor space. The footprint is deliberately narrow – it requires significantly less space than its appearance suggests.
| Model | Height | Width | Depth |
|---|---|---|---|
| H1 · The Sanctuary | 120 cm | 75 cm | 32 cm |
| H2 · The Companion | 170 cm | 75 cm | 41 cm |
| H3 · The Explorer | 220 cm | 75 cm | 50 cm |
| H4 · The Visionary | 270 cm | 75 cm | 59 cm |
No blind spots underneath. The H-Tree has no base plate — the floor underneath remains completely clear. Books, a plant, a basket — the space is yours. And anyone who's ever tried to vacuum under a classic cat tree knows: this is different.
30 kg
per platform
2
Screw on top
The H-Tree is inherently stable—like a ladder. To secure it against tipping, it is fastened to the wall at the top with two screws.
The screws have no load-bearing function — the construction itself bears the weight. They exclusively secure against tipping. The keyhole system is invisible from the front and can be removed without tools.
Regarding load capacity: Each platform holds 30 kg. We have even stood on it ourselves – the H-Tree didn't complain.
Yes — with the optional Window Mounting Kit (sold separately).
The kit completely replaces the two upper wall screws. Instead of attaching to the wall, the H-Tree attaches to the window — via two 75 mm industrial suction cups directly on the glass. Transparent, residue-free, no drilling.
Each suction cup has a pull-off force of 14 kg — 28 kg combined, significantly more than the weight of any H-Tree configuration.
Additional benefit: The cat gets the best position in the room — height, natural light, unobstructed view outside.
Manufacturer's specifications. The kit is sold separately.
For wall mounting, a drill is necessary. Mounting hardware for standard walls is included. The H-Tree is fastened to the wall with two screws at the top.
Solid wall / Concrete
Use the standard wall plugs supplied.
Plasterboard
Cavity anchors necessary - separately from the hardware store, not in the standard set.
Bricks
Standard anchors, possibly slightly longer depending on the plaster layer.
66.14 lbs
per platform
The H-Tree can hold more cats than it has room for.
That's not a marketing statement — that's physics and beechwood.
Supporting structure
Solid beech wood – visible, tactile, authentic.
Platforms
Plywood — stable, uniform, durable.
Sisal
Natural fiber for the scratching elements. Replaceable when worn out — the product remains, only the sisal is renewed.
Wool felt
Natural comfort layer. Regulates temperature — warm in winter, cooler in summer. No synthetic fibers.
No MDF
No synthetic carpet
No plastic
Yes — replacement is part of the concept.
When the sisal is worn out, you only replace the scratching element — not the entire H-Tree. Each module is individually replaceable. Spare parts are available directly at htreestudio.com.
How long does the sisal last? That depends heavily on the cat — on how often they scratch, their technique, and which elements they prefer.
What we can say: when it's time, you'll know — and the rest of the H-Tree will continue to function flawlessly.
Because he's not a scratching post.
Supporting structure
Solid beech wood – visible, tactile, authentic.
Platforms
Plywood — stable, uniform, durable.
Sisal
Natural fiber for the scratching elements. Replaceable when worn out — the product remains, only the sisal is renewed.
Wool felt
Natural comfort layer. Regulates temperature — warm in winter, cooler in summer. No synthetic fibers.
The cheap scratching post will be replaced in two years. The H-Tree won't.
Shipping: Free shipping within Europe. Delivery time: 3–5 business days to Germany, 5–8 business days Europe-wide.
The H-Tree is delivered flat-packed. Assembly in under 30 minutes — instructions included.
Returns: You have 30 days to test the H-Tree risk-free. If it doesn't fit, we will arrange pickup and refund the full purchase price. Return shipping costs are borne by the customer. All details can be found in our return policy.
H-series
Four forms. One attitude.
From compact to ceiling-high — a system that grows with your cat.
Das Refugium
The first step. No compromise.
The Companion
Two levels. Twice the territory.
The Explorer
Three levels. The cat decides which one.
The Visionary
270cm. Because the ceiling is the only limit.
