Quick answer: A safe DIY cat highway starts with the studs. Find and confirm each stud with a stud finder and a small test hole, mark them with tape, then plan the route so every shelf bracket screws into a stud. Space shelves about 30 to 45 cm apart, use brackets rated well above the cat's weight, and load-test each shelf before the cat uses it.
A cat highway is a route of shelves, steps and perches along a wall that lets cats travel and rest above floor level. The most common failure is not the shelf itself but the fixing: brackets screwed only into plasterboard can pull out when a cat lands.
This guide puts the stud layout first. Once you know where the studs are, the route almost designs itself. For a window perch version see our window perch stud finder layout; this one covers a full multi-shelf highway.
Why Studs Come First on a Cat Highway
A cat jumping onto a shelf puts much more force on it than its resting weight, because it lands with momentum. Plasterboard anchors can hold light loads, but a bracket fixed directly into a timber stud is far stronger and far less likely to work loose over time. International Cat Care explains that cats value high places to rest and observe, so a route that holds them safely is worth the planning.
Kit for a Stud-Fixed Route
| Item | Spec | Notes |
|---|---|---|
| Stud finder | Edge-finding or magnetic | Magnetic finds screw heads in studs |
| Drill and bits | Small pilot bit and driver | For test holes and screws |
| Spirit level | 60 cm or longer | Keeps shelves level |
| Painter's tape | - | Marks studs without marking paint |
| Brackets | Steel, rated well above cat's weight | Two per shelf |
| Screws | Wood screws long enough to reach 30 to 40 mm into the stud | Check bracket instructions |
| Shelves | 18 mm solid wood or plywood, 25 to 30 cm deep | Carpet or cork on top for grip |
Our beginner tool kit guide covers the basics.
Finding and Confirming Studs
- Scan the wall horizontally at several heights with the stud finder.
- Mark each edge of every stud with a strip of painter's tape.
- Measure between studs; in many US homes they are 16 inches (about 40 cm) apart on centre, sometimes 24 inches (about 61 cm).
- Confirm with a small pilot hole: you should feel resistance and see wood shavings.
- Mark the centre line of each stud from floor to ceiling with tape.
Check for pipes and cables before drilling. Avoid drilling directly above or below sockets and switches, where cables usually run vertically.
Plotting the Route Along the Studs
With studs marked, sketch the route on the wall in tape. Each shelf needs two brackets, so a shelf spans at least two studs, or uses one stud with a heavy-duty single bracket designed for that. A 16-inch stud spacing suits shelves around 50 to 60 cm long, with a bracket on each of two studs.
| Stud spacing | Shelf length | Brackets |
|---|---|---|
| 16 in (about 40 cm) | 50 to 60 cm | One on each of two studs |
| 16 in, long shelf | 90 to 100 cm | Three studs |
| 24 in (about 61 cm) | 70 to 80 cm | One on each of two studs |
| Single stud | Short step, 30 cm | Heavy-duty single bracket |
Spacing Shelves for Comfortable Jumps
Cats can jump high, but a highway is for everyday use, including by older or heavier cats. Keep vertical gaps between shelves around 30 to 45 cm and horizontal gaps of about 30 cm or less. Stagger shelves like a staircase so the cat always has a step up and a step down. Ohio State's Indoor Pet Initiative lists perches and resting areas among the basic needs of indoor cats.
For older cats, reduce the gaps and add more steps. Our senior cat home modifications checklist gives sizes.
Brackets and Fixings
Use steel brackets rated well above the cat's weight; a margin of several times its weight allows for landing force. Screw each bracket into the stud centre with wood screws long enough to go 30 to 40 mm into the timber. Pre-drill pilot holes to avoid splitting. Do not rely on plasterboard anchors for a cat shelf.
- Two screws per bracket minimum, both in the stud.
- Fix brackets so the long arm is under the shelf.
- Screw the shelf to the brackets from below.
- Add grip material on top, fixed with staples or adhesive underneath.
Load Testing Each Shelf
Before the cat uses the highway, test every shelf. Press down hard on the front edge with both hands, then hang a bag of weights or books well above the cat's weight from the front edge for a few minutes. Check that nothing moves, creaks or pulls away. Recheck screws after the first week of use.
Exits, Dead Ends and Sharing
A highway should have at least two ways down, so a cat is never trapped at the top by another cat. Add a larger resting platform at a junction or end, where a cat can turn around. Our cat highway design for small apartments covers adding a window perch at the end of the route.
Renters and Stud Layouts
Screwing into studs leaves holes that need filling when you move out. Ask your landlord first, and keep the number of holes to a minimum by planning the route carefully. If drilling is not allowed, a freestanding tower or tension-pole system is safer than any no-drill shelf. Our no-drill rental window perch ideas and tension-pole tower stability test cover options.
Maintenance
- Monthly: check every screw and bracket for movement.
- Monthly: check grip material for wear or loose staples.
- Every few months: re-level shelves.
- If a shelf moves at all, stop use until it is fixed.
Our cat wall shelves and window perches hub links related builds, including a stud-safe wall cat tree.
Planning the Highway on Paper First
Before you drill anything, draw the wall to scale on squared paper, with one square for every 10 cm. Mark the studs, windows, doors, sockets, switches and any furniture that will stay against the wall. Then draw shelves as rectangles on the studs and check the gaps with a ruler.
- Draw the wall, openings and stud lines.
- Mark a start point the cat can reach from the floor or furniture.
- Add shelves in a staircase, each spanning at least two studs.
- Mark the end point: a large platform or a window perch.
- Add a second way down from the top.
- Transfer the plan to the wall with painter's tape and step back to check.
Leave the tape outlines up for a day. Cats often investigate taped shapes, and you can see whether furniture or curtains get in the way before you commit.
Common Layout Mistakes
| Mistake | Problem | Fix |
|---|---|---|
| Shelf on one stud with two brackets | Second bracket in plasterboard only | Move the shelf to span two studs |
| Gaps over 50 cm | Cats hesitate or misjudge | Add an extra step |
| Route ends at a dead end | Cats can get trapped | Add a second way down |
| Shelf over a radiator or TV | Heat, falls onto equipment | Reroute the highway |
| Bare wood tops | Slippery when landing | Add carpet, cork or sisal |
Shelves near a door can be knocked when the door swings. Keep the route at least a door's width away from hinges.
Choosing Shelf Depth and Grip
Shelves 25 to 30 cm deep suit most cats; large breeds are happier on 30 to 35 cm. A shelf that is too narrow makes cats land awkwardly and turn with difficulty. Cover the top with a carpet offcut, cork sheet or sisal mat, fixed from underneath so no staples face up. Round the front corners with sandpaper so a cat brushing past does not catch its side.
Cat Highway Stud Questions
Do cat wall shelves need to go into studs?
For a cat highway, yes. A cat landing on a shelf puts much more force on it than its resting weight. Brackets fixed directly into timber studs are far stronger and less likely to work loose than plasterboard anchors. Confirm each stud with a small test hole first.
What gap between highway shelves suits most cats?
Keep vertical gaps around 30 to 45 cm and horizontal gaps around 30 cm or less, staggered like a staircase. Older or heavier cats need smaller gaps and more steps. Always give the route at least two ways down so a cat is never trapped.
How far apart are wall studs?
In many US homes, studs are 16 inches, about 40 cm, apart on centre, and sometimes 24 inches, about 61 cm. Spacing can vary, so always scan with a stud finder and confirm each stud with a small pilot hole before fixing brackets.
How do I test a cat shelf is safe?
Press down hard on the front edge, then hang weights well above your cat's weight from the front edge for a few minutes. Check that nothing moves, creaks or pulls away from the wall. Recheck all screws after the first week, then monthly.
