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Catio Chronicles 2: It’s happening!

25 August 2025

1263 words

After many months of interruption, we have finally finished the catio. Recall that, last time, we left off at a rough sketch of a plan:

And all that was left was getting the materials and actually building the whole thing.

Neither Katherine nor I had ever really done anything remotely like this project before, and it was pretty scary for our first time ordering wood online to be this pricey. We ended up buying about 50m of wooden beams, plus several square-metres of thinner wooden sheets. The wood cost us about £500, and we spent another £300 on random other stuff – tools, hinges, the mesh, screws, etc.

Click on any picture to enlarge.

The wood arrives

50 meters of wooden beams, packaged in bubble wrap, sitting on the kerb outside our flat.

It doesn’t look so bad lying on the street outside the house, but it was a real pain to get it in: The pieces were about 4–5m each, far too long to fit around all the corners needed to get them through the door, so we had to push them in through the front window and be really careful not to smash the glass in the process. Since we were only two people we had to push each piece in partway, with one person on the inside of the house and one on the outside, then rest it on the bottom window pane while the outside person rushes in, and manoeuvre it the rest of the way with both of us indoors.

Jinx was very confused about all this new stuff in the flat:

Jinx is looking suspiciously at the wooden beams, as they take up most of the space of our living room

(I don’t think I have any pictures of the big sheets of thin wood in the flat.)

And with all some of the materials gathered, it was time to start the construction.

The general approach was:

  1. Cut up the wood into beams of the right lengths (which means we needed to figure out exactly how everything would fit together.)
  2. Varnish all the wood so it’ll be protected from the weather.
  3. Assemble each wall separately, adding mesh as needed.
  4. Put it all together.

Step 1: Cutting stuff up and yet more planning (ugh)

Here, Katherine is doing some measurements:

Katherine is doing some measurements on one of the beams

And I’m doing some very professional-looking sawing:

Though that was quickly interrupted when I scraped my leg with the saw:

Katherine does sawing too:

Step 1.5: Practice time!

Step 1.5: Time for a little diversion! We wanted to practice putting things together on a smaller scale, to see if it would even work at all. So we used some of the surplus from the big beams to make a little practice corner out of two pieces, connected with a 90° bracket, and reinforced with a diagonal bit held in place by hinges:

Three panels. 1: Two wooden blocks roughly lined up at a right angle. 2: A diagonal block is placed on top. 3: The blocks are attached to each other with a bracket for the right angle, and hinges holding the diagonal block in place to stabilise the structure.

It actually turned out a lot sturdier than I had expected.

Steps 2 & 3: It’s varnish o’clock

Happy with the outcome of the practice corner, it was time to take all the cut-up wood, lay them out in the garden, and varnish them, so we didn’t have to be as careful about covering them with a tarp every night. In England, it sometimes rains. Who knew. See how pale they are in this picture:

11 wooden beams are resting on ladders that we placed (lying down) on the lawn. They are ready to be varnished.

Once all the big bits were varnished, we started putting together the frames for the walls. Here’s our first rectangle:

Katherine is inspecting our first rectangle

Katherine is sitting in the rectangle. Another vertical beam has been added to it.

Here you can see the effect of the oil coating a little better; the rectangles are kind of a nice golden colour:

Two rectangles are stacked on the grass. Shorter stabilising blocks are in the middle, waiting to be varnished before we can attach them.

Jinx is inspecting the rectangle too

We added some diagonal bits to stabilise the whole structure:

A stabilising diagonal has been added to one of the corners

After the first wall was done, we put it aside, so (1) we could marvel at its beauty in the context of where it would one day be assembled, and (2) so we’d have space on the grass to assemble the next wall.

The first wall is finished. It leans against the house, in what will be its final position

Here’s the next wall. This one won’t be flush to a building wall, so we need mesh to cover it.

Two rectangles are lying in the grass. The top one has mesh over it, making it into a wall. More stabilising beams are resting on top. They look shiny since they've been varnished.

Two rectangles again. The bottom one is sprouting some nice vertical bits. These will turn into the ceiling eventually.

I think this is the point at which we’re delayed for months and months due to bad weather, so suddenly we go from summer to the middle of winter:

Badly framed photo of the rectangles with meshed roof bits attached

Around this time we also started to get worried about the fact that we hadn’t really planned all the way through how we would assemble the walls, and we were discovering that the fact that the patio area is far from rectangular was actually going to be a problem. Katherine’s dad came over to help us do some exciting trigonometry and decide whether to make the final foundation rectangular or some crazy shape.

Katherine and her dad are connecting half of the catio wall to the frame we put down earlier

In the end, we decided to make the frame rectangular, to make it easier for us to connect all the corners. Here’s the finished catio, with Jinx inside looking forlorn. (In the meantime, he even got that nice house within a house!)

The finished catio, seen from the outside

The door is made of a big plane of thin wood, with sections cut out, and mesh zip-tied over it. I was most worried that the hinges or locking mechanism would be a problem, but they worked a charm. The real challenge with the door is that it’s bending quite a bit.

The door

You can already see it in the picture above, but over the months it’s gotten a lot more severe. Without any better solution in hand, we’ve added some metal pipes to straighten the door. Maybe that will help:

The door has some metal pipes attached to straighten it out

The view from the bedroom:

The view of the catio from our bedroom

Jinx sitting in his prison

Jinx looking out