Monopoly Houses and Hotels: How Building Actually Works

A standard Monopoly set holds 32 houses and 12 hotels, and that supply is a rule rather than a suggestion. You build only on a complete colour group, only in even steps across that group, and the fifth building on a property is a hotel. Empty the bank of houses and everybody else has to wait.

Most tables get at least one of those wrong.

How many houses and hotels are in the box

Thirty-two houses, twelve hotels. Hasbro's rulebook lists both in the equipment section next to the dice and the tokens, and the count is load-bearing: the bank really can run out. When two players want more buildings than are left, the official rule sends the buildings to auction and the highest bidder takes them. When the bank has none at all, nobody builds until somebody sells houses back.

Twenty-two properties compete for thirty-two houses. One player developing three colour groups to four houses each burns through thirty of them, which is how a shortage stops being an accident and starts being a plan.

When you're allowed to build

Four conditions have to hold before a single house lands on the board:

• you own every property in the colour group
• nothing in that group is mortgaged
• it's your turn and you haven't rolled yet
• you can pay the build cost in cash

The mortgage condition is the one that surprises people. A single mortgaged property freezes construction across the whole group, including the properties that are paid off, so the cheap trick of mortgaging one street to fund houses on the other two doesn't work. Lift the mortgage first. The cost of doing that, and when it's worth it, is in our mortgage guide.

Timing matters too. Building happens before you roll, so the decision competes with everything else you might do with that cash: unmortgaging, saving for rent you can see coming, or buying your way out of jail.

The even build rule

Houses have to spread across the group before they stack. With the orange set, you can't put a second house on the first street until the other two each carry one. Same on the way down: you sell evenly too.

The rule exists to stop a cheap ambush, where a player drops four houses on the single square an opponent is about to reach and leaves the rest of the group bare. Our engine enforces it in classic games and turns it off in Speed and Showdown, where uneven building is part of what makes those modes faster. The full list of what changes per mode is in our game modes guide.

What a house costs and what it returns

Build costs on our board run in four tiers: 500 for brown and light blue, 1,000 for pink and orange, 1,500 for red and yellow, 2,000 for green and dark blue.

Take the cheapest orange street. Bare, it charges 140. With the group complete but undeveloped, that doubles. Then the ladder goes 700, 2,000, 5,500, 7,500, and 9,500 for the hotel, at 1,000 per step.

Read that ladder again, because the shape of it decides games. The third house is where rent jumps from 2,000 to 5,500, which is 3,500 of extra income for a 1,000 outlay, and no other step on any property comes close to that ratio. The fourth house adds 2,000. The hotel adds another 2,000 for the same price.

Our bots are written to stop at three houses per property and start the next group. That isn't a personality quirk, it's the ladder.

Across every game played on our servers, players have built 42,967 houses and hotels. Only 3,658 of those were hotels, so roughly one building in twelve ever reaches the fifth level, and 897 games have seen a hotel at all. Most games end while the winner still has houses on the board.

Hotels and the fifth building

Officially, a hotel is a trade: hand four houses back to the bank, pay the difference, put the hotel down. The four returned houses go back into the supply for everyone else, which is exactly why hotels can break a house shortage as well as cause one.

Our version keeps the fifth level and drops the trade-in, because we don't track a shared building supply at all. The fifth building costs the same as the first four and nothing returns to a pool. Rent tops out at the hotel figure either way. If you want the exact number for any property before you commit, our rent calculator has all of them.

Selling buildings back

The official rulebook buys buildings back at half price. That 50 percent haircut is a real penalty, and it's the reason experienced players mortgage before they demolish.

We pay the full build cost back in classic games and 75 percent in Showdown. Players have sold 8,894 buildings back so far, almost always in the same panicked minute they discovered what somebody else's hotel charges.

One ordering rule catches almost everyone: you can't mortgage a property while any property you own in that colour group still has buildings on it. Sell the buildings first, then mortgage the bare land. Do it in the wrong order and the game refuses the second half.

The house shortage as a weapon, and why ours doesn't have one

Buy houses you don't need. Keep them on cheap streets. Watch the player with the dark blue monopoly sit there unable to build because thirty-two houses are spoken for. On a physical board that's legal, brutal, and one of the strongest tactics in tournament play.

Our board has no such cap, and that's a deliberate trade. Online games run with a turn timer, and a rule where your best move is blocked by another table's inventory reads as a bug to anyone who didn't grow up with the cardboard version. The colour groups you fight over are covered in our property ranking, and the order you should develop them in is in the strategy guide.

Which groups actually reach a hotel

Those 42,967 buildings thin out fast as they climb: 16,395 first houses, 10,611 seconds, 7,261 thirds, 5,042 fourths, and 3,658 hotels. A little over one first house in five ends up as a hotel on the same square. Most never get near it.

Sort that by colour group and the ranking is not the one most tables expect.

Look at the top row. The cheap brown pair everyone laughs at is the group that actually gets finished: five buildings on both squares cost 5,000 at 500 a house, which is a number players reach early enough to matter, while green costs 2,000 a house and the same development runs 10,000 per square. Only twelve percent of the time does anybody get there. The rest stall at two houses and hold a monopoly that charges like a side street. The exact rent at every level is in our rent calculator.

The first house of a game goes up in round 19 on average. If your cash is still untouched at round 25, somebody else is already collecting.

So build to three, spread the risk across two groups, and keep enough cash to survive the lap after you spend. Or skip the theory and go find out which streets your friends underestimate, in the lobby.