Every citizen you will ever have needs a roof. That makes houses the quiet foundation of your town, because they set the hard ceiling on how many people you can hold. This is a shorter topic than some, but it is one of the most important, since almost every ambition you have - more workers, more production, more growth - traces back to having somewhere to put people. Get cosy with houses now and you will never be mysteriously stuck later.
I love teaching this lesson because the math is so kind. There is no hidden formula, no diminishing returns, no fine print. A house holds people, you add up your houses, and that is your limit. If numbers ever make you nervous, let this be the lesson that reassures you - the whole thing fits in a single sentence, and we are going to say that sentence a few different ways until it feels obvious.
Rooms are the limit
Citizens must live somewhere. Residential houses provide rooms, and rooms are what cap how many people the town can hold. The rule is blunt and worth memorising: no free room means no new citizen. You can have all the materials and energy in the world, but if there is nowhere for a person to live, they simply will not arrive. The house is the gatekeeper of your population.
New mayors sometimes hit this wall without understanding it, and I want to spare you that confusion. You go to bring in a worker, everything seems ready, and the game just will not let you - no error you have caused, simply no space. It is not a bug and you have not done anything wrong; your town has reached its room limit, and the game is politely refusing to overcrowd it. Once you know to look at your rooms first, this stops being a mystery and becomes a simple checklist item: before you grow your population, make sure there is somewhere for the new people to live. That single habit prevents a whole category of frustration.
How many a house holds
A house holds twice its level in residents. That is the whole formula, and it scales cleanly all the way up with no surprises. Let us lay out the key points so the pattern is unmistakable, because seeing it three times makes it stick.
- A level 1 house holds 2 residents.
- A level 5 house holds 10 residents.
- A level 10 house holds 20 residents - the maximum, since houses cap at level 10.
Your town's population cap is just the sum of the rooms across all of your houses added together. So if you had two level 1 houses, that is 2 plus 2, for a cap of 4 people. Swap one of those for a level 5 house and you are at 2 plus 10, a cap of 12. The math is genuinely this simple - count the rooms in every house, add them up, and that total is the most citizens your town can ever support at once. No calculator required, just a moment of counting.
It helps to picture this as the literal beds in your town. Every resident occupies one room, so a level 5 house with 10 rooms is full once 10 people live in it - the eleventh has nowhere to sleep and cannot arrive. When you are planning how big your workforce can grow, you are really just counting beds. If you want 30 working citizens one day, you will need houses whose levels add up to 30 rooms between them, and the math above is the only tool you need to plan that. Want a bigger town? Add beds. It really is that direct.
Upgrading is the fastest room
Because a house holds twice its level, upgrading a house is the most direct way to make room. Taking one house from level 1 to level 2 turns 2 rooms into 4 - you doubled your space with a single upgrade rather than clearing and building a whole new plot.
Why is upgrading so often the better move than building anew? Look at the doubling. Each level you add to an existing house is worth another 2 rooms, and you do it on ground you already own and already cleared. Building a fresh house instead means claiming a plot, spending the energy and hours to clear it to grass, and then constructing from level 1. Both paths give you rooms, but the upgrade reuses everything you have already paid for. New players who lean on upgrades tend to grow their population faster and with far less land than those who sprawl outward with lots of little level 1 houses. Going up is usually wiser than going wide.
You might wonder whether to build many small houses or fewer large ones, and it is a fair question to sit with. Both add rooms the same way, so it often comes down to your space and your roads. But there is one extra reason to favour higher-level houses that we will get to at the very end of this chapter: house level also drives your town's happiness. We will cover happiness fully in lesson 10, so just tuck away the fact that taller houses do double duty - more rooms and more happiness. It is a teaser, but an honest one, and it tilts the answer toward building up.
Let me give you one more way to feel why houses come first in your thinking. Every other ambition in this game - more workers clearing land, more specialists running workshops, more goods flowing to market - is downstream of having somewhere for people to live. Houses are the riverbank that decides how wide the river can run. A town that forgets to build houses will keep bumping into invisible walls: it cannot recruit, cannot grow its workforce, cannot scale up production. A town that keeps a little spare room at all times never feels those walls. So even though houses do not make goods themselves, they quietly enable everything that does.
A gentle planning habit follows from all of this. Before you launch into a big push - say you want to recruit a wave of new workers to staff a fresh workshop - take a breath and count your free rooms first. If the rooms are there, wonderful, proceed. If they are not, your very first move is a house: build a new one, or better yet upgrade an existing one to double its rooms. Doing this little check up front turns recruiting from a guessing game into a smooth, predictable step. You will never again go to bring in workers only to be told there is no space, because you will have already made the space.
That is the whole story of population: rooms set the cap, a house holds twice its level, and you add up every house to find your limit. Say it back to yourself once and you own it for good. Now that you can make room for people, the next lesson is about actually bringing them in - recruiting citizens at the City Hall, where those beds finally get filled.