House Number Signs: History, Style and Traditions

A house number sign serves a seemingly simple purpose: identifying an address. Yet this familiar feature of building façades has a history stretching back several centuries, shaped by local traditions and manufacturing techniques that have evolved alongside European cities.

From the earliest numbers painted directly onto walls to enamelled signs capable of lasting for decades outdoors, the way buildings are identified tells us a great deal about the development and character of a town or city.

How did house numbering begin?

Before house numbers were introduced, buildings were often identified by their owners' names, traditional house names, decorative symbols or familiar local landmarks. In many European towns and cities, houses had their own distinctive signs depicting animals, plants, objects or trades.

Systematic house numbering became widespread in Europe particularly during the second half of the 18th century. Initially, its purpose was largely administrative rather than helping people find their way. Authorities needed a reliable way to identify buildings for censuses, tax records and the organisation of military billeting.

An important milestone came in 1770, when Empress Maria Theresa ordered the introduction of house numbering in the Austrian and Bohemian territories of the Habsburg Monarchy. At the time, numbers were generally painted directly onto building façades.

Later, as cities expanded and postal services developed, numbering buildings along individual streets became increasingly important for navigation and identifying addresses.

Not every city uses the same numbering system

Today, we generally take it for granted that buildings are numbered along each street, with even numbers on one side and odd numbers on the other. However, this has not always been the case.

Paris introduced its modern house numbering system in 1805. Buildings are numbered separately along each street, with even and odd numbers on opposite sides. The direction of numbering is determined in relation to the River Seine.

Prague offers an even more interesting example. Many buildings display two plaques with different numbers: one red and one blue. The red number identifies the building within the administrative numbering system, while the blue number indicates its position along the street. Both systems remain in use today.

In Vienna, the numbering system introduced in 1770 was revised and expanded several times over the centuries. Some historic house numbers have been preserved as reminders of earlier administrative systems.

These differences show that house numbers are more than practical identifiers. They also reflect the administrative history of European cities.

From painted numbers to enamelled signs

Early house numbers were often painted directly onto plastered walls. Over time, signs made from wood, metal, ceramics and other materials became increasingly common.

From the late 19th century onwards, advances in industrial enamelling encouraged the wider use of metal signs coated with vitreous enamel. These became a popular solution for displaying house numbers, street names and other forms of urban signage.

A vitreous enamel sign is made from steel sheet specially suited to enamelling, coated with several layers of enamel fired at temperatures of approximately 800°C.

During firing, the enamel forms a hard, smooth and glossy surface with excellent resistance to UV radiation, rain, frost and temperature fluctuations.

Unlike ordinary painted surfaces, the colour is part of the vitreous enamel coating itself. This helps explain why many historic enamelled signs retain their appearance even after decades of exposure to the elements.

Vitreous enamel also offers an important advantage when mechanical damage occurs. If a strong impact chips away the enamel and exposes the steel beneath, rust may develop in the affected area. However, corrosion generally remains localised rather than spreading beneath the intact, firmly bonded enamel coating, as can happen with certain paint finishes. The undamaged enamel continues to protect the steel underneath.

Enamelled signs in Romania: a continuing tradition

Vitreous enamel signs also have a long history in what is now Romania, closely associated with the development of towns and cities and their street signage systems.

In many places, signs installed decades ago, including before 1989, can still be seen today. With their distinctive colours, shapes and lettering, some have become recognisable features of the local streetscape.

In recent years, numerous local authorities have chosen to continue this tradition by installing new enamelled signs. Some projects involve updating street name signage, while others require the installation of large numbers of house number plates. Such projects can be found in major cities, smaller towns and rural communities alike.

Using enamelled signs does not necessarily mean reproducing historic designs. The technology allows both traditional and contemporary styles, tailored to the visual identity of each town or community.

What should you consider when choosing a house number sign?

Appearance matters, but a house number sign must first fulfil its essential purpose: making the address easy to identify and read.

Size and legibility. The numerals should be large enough to read from the required distance. Good contrast between the background and the characters is often more important than an elaborate design.

Material and outdoor durability. A sign mounted on a façade is constantly exposed to sunlight, rain and changing temperatures. The material and finish should therefore be selected according to the expected service life.

Shape and style. Signs with embossed edges and traditional colour combinations suit many older buildings. For contemporary architecture, simpler shapes and modern typefaces may be more appropriate.

Positioning. The house number should be clearly visible from the street and should not be obscured by vegetation, gates or architectural features. Any local regulations governing the size, appearance and placement of house numbers must also be considered.

A well-chosen house number sign does not need an elaborate or eye-catching design. It simply needs to be clear, durable and suited to the building's architecture.

What makes a high-quality enamelled sign?

From a manufacturer's perspective, the quality of an enamelled sign depends on much more than its finished appearance.

Selecting the appropriate steel sheet, preparing the surface, applying the enamel layers evenly, controlling the firing temperature and producing accurate lettering all have a direct effect on the durability and appearance of the final product.

Construction details are equally important. Embossed edges can increase the rigidity of the sign, while mounting holes must be positioned to ensure secure installation without damaging the enamel coating.

At our workshop in Oradea, Oraexacta manufactures enamelled house number signs, street name signs and institutional signs. Our experience ranges from individual products to large-scale street signage projects involving hundreds or thousands of signs, each with its own inscription.

For projects of this scale, consistent dimensions, accurate colour reproduction, legibility and well-organised production are just as important as the quality of the manufacturing process itself.

A small detail with a long history

House numbers were originally introduced for administrative purposes, but over time they became a natural part of buildings and the identity of towns and cities.

Today, a wide range of materials and manufacturing techniques is available. Yet vitreous enamel signs continue to be valued for their combination of traditional appearance, resistance to the elements and long service life.

A house number sign occupies only a small part of a façade, but it is one of those details that needs to remain functional and easy to recognise for many years.