Many mass-produced devices are manufactured in standard plastic housings for years because they offer a quick and practical solution at the start of a project. However, as production volumes increase and product lifecycles lengthen, the economic conditions change—and with them, the requirements for the housing design.

Initial situation: Use of a standard housing in the early project phase

When developing electronic devices, selecting the right housing is one of the fundamental design decisions. Many projects initially start with a standard housing. The reasons are obvious: Standard housings are available at short notice, incur no tooling costs, and enable a quick project start.

However, as a product nears series production, requirements often change. Production volumes increase, product design becomes more important, and aspects such as ergonomics, assembly effort, or the integration of electronics and control elements also gain significance. At this point, at the latest, the question arises as to whether a standard housing remains the most economical solution in the long term.

When Standard Housings Make Sense

Standard housings have their place and offer numerous advantages, especially in early project phases.

For functional samples, prototypes, feasibility studies, or small production runs, they enable a quick and cost-effective project start. The housings are available on short notice and can often be used without significant development effort.

Especially when the product is still in the concept phase or future requirements have not yet been definitively defined, a standard housing can be a sensible choice.

When the standard solution reaches its limits

However, as the product matures, the framework conditions often change.
Displays, control elements, or connectors must be integrated. Requirements for protection class, ergonomics, or design increase. At the same time, assembly times should be reduced and manufacturing costs optimized.

In many cases, this requires additional machining steps on the standard housing. Display cutouts must be milled, fasteners added, or additional components integrated. This results in costs that were often not taken into account in the initial assessment.

Unit price alone is not the deciding factor

When selecting an housing, the purchase price is often compared first. However, this consideration is not sufficient for an economic evaluation.
In addition to housing costs, other factors influence the total cost of a product:
Assembly effort, Post-processing, Inventory management, Quality management, Serviceability, Product lifespan and Delivery capability.

Especially for products with longer production runs or higher quantities, these factors can have a greater impact on cost-effectiveness than the actual housing costs.

Custom housings open up new possibilities

With a custom solution, the housing is designed from the outset to meet the application’s requirements. Electronics, displays, control elements, and mechanical functions can be optimally integrated. At the same time, ergonomics, design, and protective features can be specifically tailored to the intended application.

Manufacturing and assembly processes can also be taken into account during the development phase. This often reduces the number of individual components as well as the effort required in series production.

Another advantage lies in the independence from standard platforms. Product dimensions, shapes, and functions are not based on an existing housing, but on the actual requirements of the application.

Properly evaluating tooling costs

The most common objection to custom plastic housings is tooling costs.
In fact, the development of an injection molding tool initially represents an investment. However, these costs should not be viewed in isolation.

It is crucial to consider the entire product lifecycle. If tooling costs are spread across several thousand or ten thousand units, their impact on unit costs decreases significantly. At the same time, lower assembly costs, a reduced number of components, and more efficient manufacturing can often offset the initial investment.

Case Study: Handheld Device in Measurement Technology

A manufacturer of measuring instruments planned the series production of a mobile handheld device for service and testing tasks. In the early project phase, a standard housing was initially used. However, as production volumes increased, it became apparent that both the economic and functional possibilities were limited.

Together with N&H Technology, a custom plastic housing with a precisely fitting silicone protective cover was subsequently developed. The housing was precisely tailored to the electronics, display, control elements, and the requirements of mobile use.

The custom solution not only enabled improved ergonomics and a unique product design but also significantly reduced unit costs. The economic break-even point was reached after just around 1,200 units. Over the product lifecycle in question, this resulted in total savings of approximately 30,000 euros.

Beyond unit costs: The strategic benefits of a proprietary housing platform

The decision to opt for a custom housing solution is often initially evaluated from an economic perspective. Equally important, however, are the long-term strategic advantages that arise over the entire product lifecycle.

Developing a proprietary housing concept creates a product platform specifically tailored to the application’s requirements and capable of being further developed over many years. Functions, electronics generations, or product variants can often be implemented within the same housing architecture. This reduces development effort and time-to-market for future product versions.

Another advantage lies in independence from standard products. Manufacturers of catalog housings may discontinue products, change geometries, or adjust prices. For device manufacturers, this often means design modifications, new certifications, or unplanned costs. With a custom housing solution, tooling, design, and availability remain controllable in the long term.

Variant management can also be simplified. Different product versions can be created, for example, through colors, control elements, front panels, or features without altering the basic housing design. This reduces complexity in development, procurement, manufacturing, and service.

Furthermore, the housing influences how a product is perceived. Shape, feel, and design contribute significantly to brand recognition and support market positioning. Especially in highly competitive industries, the housing thus becomes an important component of the product’s identity.

A custom housing solution therefore not only provides technical and economic advantages but often forms the basis for a long-term stable, scalable, and future-proof product strategy.

Conclusion

Standard housings are a sensible solution for prototypes, pre-production runs, and many smaller projects. They enable a quick project start and avoid initial investments in tooling.
However, with increasing production volumes, longer product lifecycles, or higher demands on ergonomics, design, and integration, a custom housing solution may be the better choice both economically and technically.

The crucial question is therefore not whether a tool is required, but which solution offers the greatest benefit over the entire product lifecycle. It often turns out that the most economical solution does not start with the unit price, but with a holistic view of the product, manufacturing, and application.

Info Box: 10 Questions for Selecting the Right Housing Concept

What is the planned total production volume over the product lifecycle?
Are future product variants or expansions already foreseeable?
Do displays, keyboards, connectors, or sensors need to be integrated?
What are the requirements for protection class, sealing, and environmental influences?
Is ergonomic operation or a specific tactile feel required?
How important are ease of assembly and short production times?
Are there requirements regarding corporate design or product differentiation?
How long should the product be available on the market?
What risks are associated with reliance on standard components?
Are the total costs over the product lifecycle considered, or only the acquisition costs?  

Practical Tip:
If several of these questions are answered with high requirements, it is often worth considering a custom housing solution. Especially for medium and higher production volumes, the advantages in terms of integration, assembly, supply reliability, and total cost of ownership can significantly outweigh the initial tooling costs.