Most products don’t fail dramatically. They deteriorate gradually. The return rate creeps up. The unit cost drifts above the margin target. A competitor launches something that makes yours look dated. Customer complaints shift from occasional to persistent. Assembly takes longer than it should, and the production team has workarounds for problems that were supposed to be temporary.

None of these are catastrophic on their own. But they’re signals. And if several of them are happening at once, they usually point to the same conclusion: the product needs redesigning.

At Bluefrog Design, based in Leicestershire, we regularly work with manufacturers and product owners who’ve reached this point. They know something isn’t right, but they’re not always sure whether a redesign is the right response, or whether the cost and disruption of changing a product that’s already in production is justified. This article is designed to help you make that assessment. Here are the five most common signs we see — and what a redesign would actually address in each case.

A rising return rate is one of the clearest indicators that something in the product isn’t working. Returns are expensive — not just the direct cost of replacement or refund, but the logistics, the customer service time, the warranty administration, and the reputational damage that accumulates with every unit that comes back.

The causes vary. It might be a component that fails prematurely because the material wasn’t specified for the actual use environment. It might be a tolerance issue that causes intermittent fit problems across production batches. It might be a user error caused by an interface that isn’t intuitive enough — which isn’t really a user error at all, it’s a design problem.

What a redesign addresses: A focused redesign can identify the root causes of returns and engineer them out. This might mean changing a material, revising a critical tolerance, simplifying an interface, or redesigning a component that’s failing in the field. The goal isn’t to start from scratch — it’s to fix the specific issues that are driving returns while keeping the rest of the product intact. A design for manufacture review is often the starting point, because many return issues trace back to manufacturing decisions.

When a product was first designed, the unit cost may have been acceptable. But costs change. Material prices shift. Supplier terms change. Volume expectations don’t materialise. Or the original design simply wasn’t optimised for manufacturing cost because the priority at the time was getting to market quickly.

Common culprits include too many parts (every component is a supplier, a quality check, and an assembly step), an inappropriate manufacturing process for the current volume (injection moulding tooling amortised across too few units, or CNC machining on parts that should be pressed), multiple fastener types requiring different tools on the production line, and over-specified materials or finishes where a more cost-effective alternative would perform equally well.

What a redesign addresses: A cost-reduction redesign focuses on part consolidation, process optimisation, fixings standardisation, and material substitution. The discipline is in reducing cost without compromising function, quality, or appearance. This is value engineering in its most practical form — finding where cost can be removed from the product without the customer noticing the difference.

If the production team has developed informal workarounds to get products built — holding parts at specific angles, applying force to get components to fit, using jigs that were never in the original design — the assembly process is telling you something. Products that are difficult to assemble are expensive to produce, prone to quality variation, and difficult to scale.

Assembly problems typically stem from design decisions that made sense on a workbench but don’t translate to a production line. Parts that need to be inserted in a specific, non-obvious sequence. Fixings that are hard to access. Interfaces that require precise alignment with no self-locating features. Components that are easy to install incorrectly without anyone noticing until the product is tested or, worse, reaches the customer.

What a redesign addresses: Redesigning for assembly means reducing part count, standardising fixings (ideally one screw type throughout), adding self-locating features so parts can only go together one way, designing a logical build sequence, and creating sub-assemblies that can be built and tested independently before final integration. The target is a product that a production operative can build correctly, consistently, and quickly without specialist knowledge or workarounds.

Markets move. Competitors launch updated products. Material trends shift. What looked contemporary five years ago can look tired now, and in sectors where buyers make judgments based on appearance — which is most sectors — a dated-looking product loses ground regardless of how well it performs.

This isn’t about chasing trends. It’s about perceived quality and market positioning. A product that looks like it was designed a decade ago signals to buyers that the company behind it hasn’t invested in the product, which raises questions about whether they’ve invested in the performance and reliability either. Fair or not, appearance shapes perception.

What a redesign addresses: An industrial design refresh can modernise the product’s appearance while retaining the internal architecture that works. This might mean new fascia panels, updated colour and material finishes, revised proportions, or the introduction of a design language that can extend across the product range. The best refreshes look like a new product to the market but reuse as much of the existing engineering as possible — minimising tooling investment and production disruption.

Occasional feedback about a product being difficult to use can be dismissed as user variation. Consistent, repeated complaints about the same issues cannot. If multiple users are struggling with the same control, making the same mistake during setup, or finding the same feature unintuitive, the product is telling you where the design isn’t working.

Usability problems are particularly costly because they affect perception across the entire user base, not just the units that are returned. A product that works but frustrates its users generates negative reviews, poor word-of-mouth, and reduced repeat purchasing. In industrial and medical contexts, usability problems can also create safety risks — an operator who can’t easily distinguish between two similar-looking controls under time pressure is a liability, not a user experience issue.

What a redesign addresses: Usability-focused redesign examines how the product is actually used in its real environment — not how it was assumed to be used during the original design. This means understanding the user’s physical context (gloves, lighting, space constraints), their task flow (what sequence of operations they perform), and their mental model (what they expect the product to do when they press a button or turn a dial). The redesign then adjusts controls, interfaces, labelling, and ergonomics to match how the product is actually used rather than how it was imagined to be used.

Not every problem requires a full redesign. Sometimes the issue is isolated to a single component that can be modified without touching the rest of the product. Sometimes the problem is in the manufacturing process rather than the design itself — a quality issue at a supplier, a variation in raw material, or an assembly step that needs better tooling or training.

A good first step before committing to a redesign is a structured assessment: what are the specific problems, what are they costing, and what would it take to fix them? If the issues are isolated, targeted modifications may be more cost-effective than a full redesign. If the issues are systemic — multiple problems across different aspects of the product — a redesign is usually the more efficient and effective response.

A redesign doesn’t mean starting from scratch. It means taking the existing product, understanding what works and what doesn’t, and making targeted improvements that resolve the identified problems while retaining the elements that are performing well.

The typical process involves an initial assessment of the current product against the identified issues, a design for manufacture review to identify cost, assembly, and quality improvements, concept development for the areas being redesigned, detail engineering of the changes, prototyping to validate the improvements, and delivery of updated manufacturing data. Depending on the scope, a product redesign might take eight to sixteen weeks.

The output is usually an updated manufacturing data pack that the existing manufacturer can work from, with changes clearly identified so they can be implemented with minimal disruption to the existing production process.

At Bluefrog Design, we work with manufacturers and product owners across the UK who need to improve existing products — whether that’s reducing cost, fixing quality issues, updating the design, or resolving usability problems. We’re based in Leicestershire and have been doing this across consumer, industrial, and medical sectors for over twenty years. If any of the signs above sound familiar, get in touch and let’s talk about what a redesign would involve for your product.