Why are Amsterdam houses crooked?

by Tanja
Amsterdam houses

Why are houses in Amsterdam crooked? Many of the houses in the historic center seem to lean forward. Others look tilted to one side. Some even seem to fall over any moment!. There are various reasons why Amsterdam houses are crooked, slanted and skewed. Why are Amsterdam houses crooked?

Reason 1: Bad quality of the wooden poles

All houses in Amsterdam are built on piles. The piles are drilled meters deep into the wet soil. If you build houses without a sturdy pole, it will quickly sink into the swampy ground.


In the old days the piles were made of wood. The Amsterdam soil consists of eleven meters of soft peat and clay before the wood pole hit the first solid layer of sand.

Amsterdam Palace Dam Square
The Palace on Dam Square (1665) is built on a foundation of 13659 wooden poles.

Why buildings in Amsterdam look skewed

In many cases, the quality of the wood was not good enough to withstand centuries. Save to say, the builders did not give out a three hundred year guarantee! The old age and quality of the wooden piles make the buildings in Amsterdam sink unevenly in the ground, making the buildings in Amsterdam looked skewed.

Nowadays the piles are made of steel tubes, filled up with cement. The piles are drilled further into the ground until they hit a second layer of sand, at eighteen meters deep.

How to check the foundation of an Amsterdam house

There is no way to check the condition of the foundation of an Amsterdam house, except by opening up the floor and digging into the ground, a costly undertaking. Sometimes an investigation has already been done. The council of Amsterdam keeps record of these investigations and save the reports for future reference. If you ever buy a house in Amsterdam, make sure you check with council. And check the walls for cracks.

Reason 2. One of the next door houses was renovated

Tilted house in Amsterdam
Tilted house in Amsterdam

The houses along the canals in Amsterdam lean on each other for extra stability. Problems arise when one house in the row is renovated. When the poles are not in the best condition, the houses next door will start to lean to one side.

Houses on corners have it extra hard. They don’t have a neighbour building to lean on.

Reason 3. Rotting of the wooden poles

Another reason for the Amsterdam houses to tilt to one side, is because the wooden poles start to rot. In Amsterdam the water level is controlled. A special governmental agency called Waterschap continuesly checks the waterlevel. The board members of the Waterschap ar chosen independently and democratically during public elections.

The Waterschap may decide to lower the water level. When that happens, the wooden poles are exposed to air. When wood comes in contact with oxygen, it will rot. The decay of the wooden foundation is why Amsterdam houses can lean to one side.

Skewed houses in Amsterdam
Skewed houses in Amsterdam

Reason 4. Adding extra floors on top

Especially in the Amsterdam Jordaan Quarter, houses started to sink into the ground when they added an extra floor on top. The weight of the house is bigger than the old builders had calculated all those centuries ago. The result: a crooked Amsterdam facade.

Wy are houses in Amsterdam leaning forward?

Leaning corner house
A corner house on Reguliersgracht that is leaning forward and to the side.

Now we know why Amsterdam houses are crooked. But in many cases the houses seem to lean forward, towards the street. This is not an accident. For centuries, it was custom to build houses leaning forward.

It was not only a custom. Until the beginning of the 19th century, construction regulations stated that all houses needed to lean forward. It even stated by how much. Houses on corners needed to lean forward on both ‘open’ sides. In Dutch this is called ‘op de vlucht bouwen’. So why was it obligatory to build ‘leaning houses’?

Reason 1. It was a remainder from the Medieval leaning house

In Medieval times, all over Europe, all houses were made out of wood. These timber framed buildings had an upper floor larger than the size of the floor below. This technique is called jettying. (In Dutch: overstek).

Medieval house Germany
Medieval house in German staple port of Stade with jetty.

In these times the walls and roof were not as waterproof as nowadays. Rain could dripple trough the walls. It meant you have your house flooded. It also means the wood will start to rot. A house that was leaning forward had more protection against rain, snow and wind.

Reason 2. It makes the house spacier

The ‘leaning’ houses in Amsterdam also have the advantage that they are a little bigger, without taking up too much space of the street. Especially in narrow medieval street plan, a leaning house is a great advantage.

Reason 2. It makes it easer to hoist up goods

A hoist beam on an Amsterdam canal house dating back to 1662 (Herengracht 366) and window with shutters to the attic where goods were stored.

Most of the houses in Amsterdam were not used just for living. They were also used to store goods. Amsterdam was a typical ‘staple port’. This is a place where merchants make money by trading all kinds of goods that enter into the city, usually by boat.

Goods like cotton, spices and cacao were stored in special warehouses, but also in the attic of merchants houses along the Amsterdam canals. The goods are hoisted up from the street using the hook on the beam sticking out at the top floor. A leaning facade meant it was less likely that the goods hit the wall or break a window.

The fires of 1452

After a large fire in 1452 destroyed a huge part of the wooden houses in Amsterdam, new houses were as much as possible constructed with bricks. But this didnt mean the way of constructing a house was much different. The traditional construction guild of Amsterdam kept the tradition of building leaning houses.

Reason 3. It just looks good

It might sound silly, but it’s quite probable that the houses of Amsterdam lean forward because their owners wanted to show off their fancy facade. The wealth and glory of the Amsterdam canal house is mostly found in the upper part of the facade. After all, that’s where the gable is. When the house is leaning forward, you can see those decorations much better.

So when did all this change. Well, itwasn’s until Napolean came, that this tradition was no longer alive. Napoleon did away with all the existing guilds of Amsterdam. And houses were built straight. Halfway through the 20th century it was even banned to build ‘op de vlucht’. Nowadays it is allowed to build a leaning house in Amsterdam when all the other houses are leaning as well. It just looks better that way.


 

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1 comment

Valentina July 28, 2019 - 15:44

Loved this informative article! Do you recommend any specific locations (besides the most famous Dancing Houses) where we might go to view the lateral deviation of some of these amazing canal homes? Thanks:)
https://valentinasdestinations.com/

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