A Street of Good Houses

Browse<br>ForewordManifestoGlossaryGuidesPosts<br>Browse by tag<br>All posts (27)cross-cutting (1)implementing (16)investigate (2)operating (13)planning (7)retiring (3)retrospective (3)reviewing (10)triage (2)verify (4)<br>A Street of Good Houses<br>You can build every house on the street to code and still hand someone a neighbourhood that seizes the first time everyone leaves at once.<br>26 June 2026 operating planning<br>I build houses, in the way software people do. Hand me a job and you'll get something sound back. Every wire to code, every door hung straight, the sort of house you can live in for years without once wondering how it was put together. My sister builds neighbourhoods instead. That's the harder trade, and I'm a bit ashamed of how long it took me to see why.<br>Picture a street of my houses. A hundred of them. Each one perfect, each one through inspection without a single note against it. Then the first Monday comes. Every door opens inside the same few minutes and every car reverses onto the same road and the road just seizes up. Nobody moves. Nothing has broken. The houses are all exactly as I built them and every driver is doing the sensible thing, and the street fails anyway. Because the failure was never inside a house. It was out in the road they all share, at the one hour they happened to pick.<br>You can't fix that morning by building a better house. A more perfect house doesn't widen the road, and it doesn't stagger the school run either. The trouble is sitting in the gap between the houses, in the single thing they all lean on at the same moment, and no inspection of any one house is ever going to turn it up, because each house on its own is innocent. This is the part that took me a long time to sit with. You can do your own job flawlessly, a hundred times over, and still hand the world a disaster, because the disaster belonged to the whole and you were only ever looking at one part of it.<br>Software is full of first Mondays. The clearest one I know isn't software at all though, and it's nearly two hundred years old. On the twelfth of April 1831 a column of soldiers marched across the Broughton Suspension Bridge near Manchester in perfect step, the way good soldiers do. Each footfall was small and harmless and just like the one next to it. But they all came down together, and so they didn't stay small. The bridge started to sway in time with the marching, and it got worse, and worse, until a bolt at one end let go and a corner of the deck tipped its men into the river. Nobody died. It scared the British Army badly enough that they made an order they still keep to this day: troops crossing a bridge break step. Not march more carefully. Not build the bridge stronger. Break step. Because the danger had never been in any one man's stride. It was in the lot of them arriving at the same instant. Nineteen years later a bridge at Angers in France went down under a battalion crossing it in step, and that time two hundred and twenty-six soldiers died. Every man had kept perfect time. And between them they shook a bridge to pieces.<br>My sister has known this her whole working life. I had to be shown it. She doesn't build the houses. She builds the neighbourhood so that the first Monday doesn't seize in the first place. She plans the road around the worst morning rather than the average one. And she'll take whatever would otherwise pile up all at once and spread it out, and she's thinking the whole time about what a hundred parts get up to together, not what one of them does sitting on its own. It's a different craft and it's aimed somewhere else entirely. The question I ask is whether each piece is sound. She doesn't even start there. She takes it as read that something is going to give even when every piece is sound, and the work for her is stopping that one failure from dragging the whole street down with it. Where she works a bad morning isn't a risk you weigh up and gamble on, it's a certainty you plan around. And that turn of mind is exactly what let her see, in one pass over everything I'd written, the gap I'd quietly filed away as someone else's problem.<br>Because I did write a whole book about building good houses. It's local by design, which is the strength of it. It tells one tired person how to make one change to one part without bringing the rest down, and it stops at the edge of the house deliberately. What it never comes out and says is that a street of perfect houses still isn't a neighbourhood, and the neighbourhood is where the worst mornings live. My sister said it out loud. So there's a companion to that book now, about the shape of the whole and not the soundness of any single part, and I owe the better half of it to her.<br>Build the best house you can. Then go and stand out in the street on a Monday morning, because that's where you find out what you actually made.<br>This is the idea behind The Shape of the Whole, the companion to the manifesto.<br>Sources<br>[Angers Bridge 1850]...