Often cited as the narrowest house in Amsterdam, this sliver of a building on the Singel canal has a facade barely wider than its front door. The house is private and cannot be visited, but the facade is easy to spot — look for the impossibly thin frontage near the northern end of the Singel, close to Centraal Station. A good example of Amsterdam's ingenious (and tax-avoiding) canal architecture.
Singel 7
A story
The facade is barely a metre wide, though the house widens considerably behind the front wall. Amsterdam's 17th-century property taxes were based on canal frontage, so narrow facades were a form of tax avoidance. Several houses along the canals exploit this loophole, but Singel 7 takes it to an extreme.