Have a Product Idea? The Real Cost and Process of Product Development
Have you got an idea for a new product but don’t know how to turn it into reality? Perhaps you’ve sketched a design, identified a problem that needs solving or imagined a product that could become a successful business. Turning that idea into a working, commercially viable product is an exciting prospect. However, it’s important to understand what’s involved before investing your time and money.
Product development involves much more than creating a 3D CAD model. It can include feasibility studies, concept design, mechanical engineering, prototyping, testing, manufacturing preparation and production planning. Each stage requires time, expertise and, in most cases, a financial investment.
I’m Paul Gocher, a freelance mechanical design engineer at i-design, based on the Devon and Cornwall border. With decades of experience across product design, mechanical engineering and manufacturing, I’ve helped businesses and inventors turn ideas into practical, manufacturable products. In this guide, I’ll explain the stages of product development, what each involves, which costs you need to consider and how to approach the process if you’re working with a limited budget. My aim is to help you understand what’s realistically achievable before you commit to developing your idea.
Can I develop a new product if I have a limited budget?
Yes, but you need to be realistic about what your budget can achieve. You don’t necessarily need a large amount of money to begin investigating an idea. In many cases, the sensible starting point is a feasibility assessment or a small, clearly defined piece of design work.
However, developing a complete product that is properly engineered, tested and ready for manufacture requires considerably more investment. I regularly hear from people who have a promising idea but haven’t considered the cost of developing it. They may assume that a designer can quickly draw the product in 3D and that it will then be ready to manufacture. Unfortunately, it’s rarely that simple.
Professional design engineering involves solving technical problems, selecting appropriate materials, considering manufacturing methods, checking how components fit together and ensuring the design is suitable for its intended application. It takes experience, specialist software and engineering time to do this properly.
You don’t have to commit to the entire project immediately. A phased approach allows you to establish feasibility, develop the concept and make informed decisions before progressing to more expensive stages. What matters is having a realistic budget for the work you want completed and understanding that further investment may be required if you decide to proceed.
The seven stages of new product development
Every product is different, so the exact process will vary. A simple mechanical component may require relatively little development, whereas a product incorporating electronics, complex mechanisms, injection-moulded components or demanding safety requirements may need considerably more work. Nevertheless, most projects follow seven broad stages.
Stage 1: Idea assessment and feasibility
The objective: Establish whether your idea is practical and worth developing.
The first step is to understand what you want your product to do, who it is intended for and what problem it solves.At this s e, I’ll discuss your requirements and help identify the main technical challenges, potential manufacturing methods and any obvious obstacles.
Questions we may need to consider include:
What does the product need to do?
Who will use it, and who might buy it?
What makes it different from existing products?
Are there any size, weight, strength or performance requirements?
Does it need to operate in a particular environment?
What materials and manufacturing processes might be suitable?
How many units might you eventually produce?
What is the target manufacturing cost and intended selling price?
.Depending on the idea, this stage may involve preliminary sketches, basic calculations, research into components and materials, or an initial assessment of the engineering challenges.
It may also be worth investigating competing products and considering whether your concept offers a realistic commercial opportunity.
This is not a guarantee that the product will succeed. Rather, it’s an opportunity to identify potential problems before committing to substantial development costs.
Budget consideration: Feasibility work is a defined piece of professional engineering work in its own right. Even if you decide not to proceed, you gain a clearer understanding of the challenges and the likely next steps.
Stage 2: Concept design
Once the initial feasibility has been established, the next step is to develop the concept. Using SolidWorks 3D CAD, I can create preliminary models that establish the product’s overall shape, dimensions, layout and main functional components. Depending on the project, this stage may include:
Exploring alternative design concepts.
Establishing the overall dimensions and arrangement.
Identifying suitable components and materials.
Considering how the product will be assembled.
Assessing possible manufacturing processes.
Creating preliminary 3D models and visualisations.
Investigating important technical uncertainties.
The aim is to agree on a promising design direction before investing in detailed engineering.
A concept model is not necessarily a finished design. Some features may still be unresolved, and further investigation or testing may be needed.
Budget consideration: The more complex the product, the more time may be required to develop and evaluate suitable concepts. Agreeing on the scope of this stage helps prevent unnecessary design work.
Stage 4: Prototype development
The objective: Produce a physical model to evaluate the design.
A 3D CAD model is useful, but it cannot always reveal how a product will perform in the real world. A physical prototype allows you to examine the design, check component fit and investigate whether the product works as intended.
Depending on the application, prototypes may be produced using:
FDM, SLA or SLS 3D printing.
CNC machining.
Rapid sheet metal fabrication.
Off-the-shelf components.
A combination of manufacturing methods.
A simple 3D-printed model may be sufficient to check dimensions and ergonomics. A functional prototype may need stronger materials, working mechanisms, electronic components or specialist fabrication. Not every prototype needs to resemble the finished product. Sometimes a simple proof-of-concept model is all that’s required to investigate a particular feature. However, a prototype made using one process may not behave exactly like the final production product. For example, a 3D-printed component may not have the same properties or finish as an injection-moulded component.
Budget consideration: Prototypes have their own costs, including materials, components, machine time, assembly and modifications. A more complex prototype may cost substantially more than a basic printed model.
Stage 5: Testing and design refinement
The objective: Identify problems and improve the design.
Once a prototype exists, it can be assessed against the original requirements. Does it work as expected? Are the components sufficiently strong? Is the product easy to assemble and use? Does it meet the necessary performance requirements Testing may involve functional checks, dimensional inspection, load testing, thermal assessment or environmental testing, depending on the product.The results may reveal that parts need to be strengthened, dimensions adjusted, materials changed or components repositioned.
The CAD model can then be updated, and further prototypes may be needed. Some products require only a small number of iterations. Others need several rounds of development before the design is ready to progress. Products involving electrical systems, medical applications, safety risks or specific regulatory requirements may also need specialist testing or independent assessment.
Budget consideration: Allow for the possibility that the first prototype won’t be perfect. Identifying and resolving problems is a normal part of product development, not necessarily a sign that the design has failed.
Stage 6: Design for manufacture and production preparation
The objective: Prepare the design for efficient, repeatable manufacture.
A prototype that works is an important milestone, but it doesn’t automatically mean the product is ready for production. The best method for making one prototype may be unsuitable for producing hundreds or thousands of units. For example, 3D printing may be ideal during development, while injection moulding could become more economical for a larger production run. However, injection moulding introduces tooling costs and additional design considerations.
Production preparation may include:
Optimising the design for the chosen manufacturing process.
Finalising materials and specifications.
Preparing engineering drawings and CAD files.
Developing a bill of materials.
Considering assembly methods and production efficiency.
Obtaining manufacturing quotations.
Identifying and evaluating suppliers.
Reviewing tooling requirements and lead times.
Reducing unnecessary complexity and cost.
Tooling can represent a significant additional investment. Injection moulds, for example, may cost considerably more than the design engineering required to create the parts. Manufacturing quantities also matter. A process that is economical for a small production run may not be suitable for high-volume production, and vice versa.
Budget consideration: Design fees, tooling, materials, components and manufacturing costs are separate elements of the overall investment. Make sure you understand which items are included in a quotation and which will need to be funded separately.
Stage 7: Production and launch
The objective: Move from the completed design into manufacture and commercial supply.
Once the design and production arrangements are ready, the product can move towards manufacture. Depending on the project, this may involve reviewing initial production samples, resolving manufacturing issues, checking dimensions and confirming that the parts meet the agreed specifications. You may also need assembly instructions, product documentation, packaging, compliance evidence or further engineering support.
If you intend to sell the product, there are additional commercial considerations, including marketing, distribution, stock, insurance and customer support. Completing the engineering design does not automatically guarantee commercial success. Market demand, selling price, production costs and the ability to reach customers all influence the outcome.
Budget consideration: Product development and commercial launch are related but different activities. Plan for both, rather than spending your entire budget on the design itself.
How much does it cost to develop a new product?
There is no single price for product development because the work required varies considerably from one project to another. The cost depends on factors such as:
The complexity of the product.
The number of components and assemblies.
Whether electronics or specialist components are involved.
The performance, durability and safety requirements.
The number of design iterations and prototypes.
The intended manufacturing process.
The amount of testing required.
The quality of the information available at the start.
A simple mechanical component may need relatively little design work. A complete product with several mechanisms, an injection-moulded enclosure, electronic integration and functional testing will generally require a much greater investment.
It’s important to distinguish between the main cost categories.
Cost category:
What it covers:
Feasibility and concept design
Initial assessment, concept development and preliminary CAD
Detailed engineering
3D models, assemblies, calculations, specifications and drawings
Prototyping
Prototype parts, materials, components and assembly
Testing
Functional testing and any specialist or independent assessments
Tooling
Injection moulds, fixtures, jigs and production equipment
Manufacturing
Materials, components, production labour and assembly
Commercial launch
Packaging, marketing, stock and distribution
Cost category:
Feasibility and concept design
What it covers:
Initial assessment, concept development and preliminary CAD
Cost category:
Detailed engineering
What it covers:
3D models, assemblies, calculations, specifications and drawings
Cost category:
Prototyping
What it covers:
Prototype parts, materials, components and assembly
Cost category:
Testing
What it covers:
Functional testing and any specialist or independent assessments
Cost category:
Tooling
What it covers:
Injection moulds, fixtures, jigs and production equipment
Cost category:
Manufacturing
What it covers:
Materials, components, production labour and assembly
Cost category:
Commercial launch
What it covers:
Packaging, marketing, stock and distribution
Not every project requires every item, and some costs can be deferred until earlier stages have demonstrated that the idea is worth pursuing.
However, the cost of a CAD model is not the same as the cost of developing a complete, manufacturable product.
I recommend establishing a clear scope of work for each stage, agreeing on the deliverables and cost before proceeding, and reviewing the budget as the project develops.
This allows you to make informed decisions without committing the entire development budget at the outset.
How I charge for product design and engineering
I believe in providing good value for professional design engineering. My hourly rate is £40 per hour, which I believe is competitive for the experience and expertise I bring to a project.
I generally prefer to charge for the time I spend working on your project rather than quote a fixed price for the entire development process. This is often the most cost-effective approach, particularly when developing a new product, where the full scope of work and potential challenges may not be known at the outset.
I want you to understand how I charge, how I manage project costs and what to expect when working with me.
My hourly rate: £40 per hour
I charge £40 per hour for my design engineering work. You pay for the time I actually spend working on your project, rather than paying a potentially inflated fixed price that has to account for every possible eventuality.
Product development is rarely completely predictable. As a design progresses, new information may come to light, technical challenges may need to be resolved, or prototypes may reveal that modifications are necessary.
Charging by the hour allows me to address these issues as they arise without having to build a substantial contingency into an initial quotation.
I aim to work efficiently, keep you informed of progress and focus on delivering practical engineering solutions that meet your requirements.
Can I provide an estimate of the cost?
Yes. I can provide cost estimates to help you plan your budget before committing to a project or a particular stage of work.
Based on my understanding of your requirements, I can estimate the time likely to be needed and calculate an indicative cost using my £40 hourly rate.
The accuracy of an estimate depends on how clearly the work is defined and how many unknowns remain. A relatively straightforward design task may be easier to estimate than the development of a completely new product involving complex mechanisms, multiple components or several rounds of prototyping.
Where appropriate, I can break the work down into phases and estimate the cost of each one. This gives you a better understanding of the likely investment required and allows you to decide how and when to proceed.
An estimate is not a fixed-price commitment. If the scope of work changes or unexpected engineering challenges arise, the actual cost may be higher or lower than originally estimated. I’ll aim to keep you informed if it becomes apparent that the time required is likely to exceed the estimate.
Why I don't usually quote a fixed price
To provide an accurate fixed-price quotation, I need to understand exactly what work is required. With a new product, that is not always possible at the outset.
For example, a seemingly straightforward design might reveal unexpected mechanical problems, require additional components or need several rounds of refinement before it is ready for manufacture.
If I quote a fixed price before these uncertainties have been resolved, I have two choices.
Allow for the work I expect to be required. This can produce a lower initial quotation, but if additional work becomes necessary, the cost may need to be revised or the additional work agreed separately.
Allow for a worst-case scenario. This means factoring in a range of possible problems, design changes and unforeseen circumstances. The resulting quotation may be considerably higher than the amount you would actually pay if I charged only for the hours worked.
I believe the second approach can make product development unnecessarily expensive, while the first can create uncertainty for both parties.
My preference is therefore to charge by the hour as the work progresses, supported by cost estimates wherever practical. This means you pay for the engineering time required, rather than a fixed price that may include a substantial allowance for work that never becomes necessary.
Can I provide a fixed-price quotation?
Yes. Where the scope of work is sufficiently clear, I can provide a fixed-price quotation if that is your preference.
However, I need to allow for the work involved and the risks associated with the project. If significant uncertainties remain, the price may need to include a contingency to cover them.
For this reason, I find that hourly charging is often the more economical approach, particularly for feasibility studies, concept development and projects where the design is likely to evolve.
Where possible, I prefer to define a manageable first stage of work, establish what needs to be achieved and then agree on the next steps.
How I manage costs and invoicing
Although I charge by the hour, I understand that you need to keep control of your budget.
Before starting work, I aim to agree on the scope and objectives of each phase so you understand what I will be doing and what the work is intended to achieve. Where appropriate, I’ll provide an estimate of the time and cost involved.
I invoice either at the end of an agreed phase of work or at the end of the month, depending on the project and the arrangement agreed with you.
My payment terms are seven days from the invoice date.
If an invoice remains unpaid after the payment deadline, I will suspend work until payment has been received. This helps prevent unpaid work accumulating and keeps projects on a sound commercial footing.
When will I receive my CAD data?
I understand that the design data is an important part of the work you are paying for. However, I retain the right to withhold the release of native CAD data, engineering drawings and other agreed design deliverables until the relevant invoices have been paid in full.
I may provide STL files during development where appropriate, for example, to allow you to review a design or arrange a 3D-printed prototype. Providing an STL file does not mean that the complete CAD data or other outstanding deliverables have been released.
Once the outstanding payment has been received, I will release the agreed deliverables in accordance with our project arrangements.
I recommend that the scope of work, payment terms and arrangements for the release and ownership of design files are agreed in writing before work begins.
A practical, transparent approach to product development
My aim is to make professional design engineering accessible and cost-effective without compromising the quality of the work.
By charging a competitive hourly rate, providing cost estimates where possible, invoicing at sensible intervals and dividing projects into manageable phases, I want you to understand where your money is being spent and what you are getting in return.
If you have a new product idea, we can start by discussing your requirements, your budget and the most appropriate first step. You don’t need to commit to the entire development process at once.
Contact me, Paul Gocher at i-design to discuss your project.
Can I develop a product on a small budget?
Possibly, but it depends on what you mean by a small budget and what you expect to achieve. If you have limited funds, the best approach is usually to focus on the most important technical questions first. For example, rather than developing an entire product immediately, you might begin by investigating whether a particular mechanism will work or whether a proposed arrangement of components is practical. You can then decide whether to invest in the next stage.There are several ways to keep early development costs under control.
Start with the essential function
Focus on what the product must do. Additional features, complex styling and cosmetic refinements can often wait until the core concept has been demonstrated.
Develop the product in phases
Start with a defined feasibility assessment or concept design rather than committing to a complete development programme before you know whether the idea is practical.
Use appropriate prototyping methods
A simple 3D-printed part may be enough to test an initial concept. There may be no need to commission expensive tooling or production-quality components at an early stage.
Avoid unnecessary changes
Changes to agreed requirements, dimensions or features can mean additional design work and new prototypes. Establishing the main requirements early helps reduce avoidable costs.
Consider the commercial opportunity
If your intention is to sell the product, consider the likely selling price, manufacturing cost, target market and expected production quantities as early as possible. A technically successful product still needs a viable commercial model.
Be realistic about what your budget can achieve
This is perhaps the most important point.If you can only afford a preliminary assessment, that is a perfectly reasonable place to start. However, it would not be realistic to expect that same budget to cover detailed engineering, several prototypes, testing, production tooling and a finished product ready for sale. If the available funds are insufficient, it may be sensible to save further, seek investment, find a business partner or refine the idea before proceeding.I would rather help you identify a pra ctical first step than encourage you to spend money on work you cannot afford to complete.
What should you prepare before contacting a product design engineer?
You don’t need a finished design or a detailed technical specification before getting in touch. However, a little preparation will help establish what is involved and whether the project is ready to proceed.
It helps if you can explain:
The problem: What does your product need to solve?
The intended user: Who will use or buy it?
The basic function: How do you envisage it working?
The current stage: Do you have sketches, a CAD model, a prototype or just an initial idea?
Your objectives: Are you looking to prove the concept, develop a prototype or prepare for manufacture?
Your budget: What can you realistically invest in the next stage, and what additional funding might be available later?
Your commercial plans: If the product is successful, how do you envisage manufacturing and selling it?
Rough sketches, photographs of similar products and a written description are often sufficient to begin an initial discussion. You don’t need to know all the answers. Part of my role is to help identify the questions that need resolving.
How do I protect my product idea?
Many inventors are understandably concerned about sharing their ideas. Before disclosing commercially sensitive information, consider whether a confidentiality agreement is appropriate. You should also establish in writing the scope of the work, the deliverables and the terms governing ownership of the design and associated intellectual property. Depending on the nature of the invention, you may wish to seek advice about patents, registered designs, trade marks or other forms of protection. If you believe your idea may be patentable, consider speaking to a patent attorney before publicly disclosing it, as disclosure can affect your options for patent protection. Not every idea is patentable, and the appropriate approach depends on the circumstances.
How i-design can help you develop your product
I’m Paul Gocher, a freelance mechanical design engineer based on the Devon and Cornwall border. Through i-design, I help inventors, entrepreneurs and established businesses turn ideas into practical engineering solutions. My experience spans a wide range of industries, including medical devices, scientific instruments, security products, consumer products and industrial equipment.
My services can include:
Feasibility studies and concept development.
SolidWorks 3D CAD modelling.
Mechanical design engineering.
Design for manufacture and assembly.
Rapid prototyping and design refinement.
Engineering drawings and specifications.
Material and manufacturing process selection.
Support with supplier sourcing and production preparation.
You can learn more about my product design and mechanical engineering services or explore examples of my work in the i-design case studies. I tailor the work to each project. Some clients need help with one specific component, while others require support through several stages of product development. Where appropriate, I break projects into defined phases, with agreed objectives, deliverables and costs. This helps you understand what you are paying for and make decisions about whether to proceed to the next stage. My aim is to provide practical, cost-effective engineering support while ensuring that the work undertaken is appropriate to the product and its intended use.
Frequently asked questions about product development
How long does it take to develop a new product?
It depends on the complexity of the product, the amount of design work required, the number of prototype iterations and whether specialist testing or tooling is needed. A simple concept may progress relatively quickly, while a complex product can take many months or longer to develop.
Do I need a prototype before manufacturing?
Not every product requires a physical prototype, but prototyping is often valuable for checking fit, function, usability and performance. The appropriate approach depends on the risks involved and how confidently the design can be validated without building a physical model.
Can a product design engineer help if I only have an idea?
Yes. You don’t need to have a completed design. An initial discussion and feasibility assessment can help establish whether the idea is practical and what work would be needed to develop it.
Is 3D CAD enough to manufacture a product?
Usually, a 3D CAD model is only one part of the information needed. Depending on the product and manufacturing process, you may also need engineering drawings, tolerances, material specifications, assembly information and production documentation.
Why does product design cost money if I already know what I want?
Knowing what you want the product to do is an important starting point, but the engineering work involves determining how to make it function reliably, selecting appropriate materials and manufacturing processes, resolving technical problems and preparing the design for production. The amount of work depends on the complexity and requirements of the product.
Can I pay for product development in stages?
Yes. Where the project is suitable, development can be divided into phases, each with an agreed scope, deliverables and cost. This allows you to review the outcome of each stage before deciding whether to invest further.
Does the design fee include prototypes and manufacturing?
Not automatically. Design engineering, prototype manufacture, specialist testing, production tooling and manufacturing are often separate costs. Always establish exactly what is included in a quotation before work begins.
Ready to discuss your product idea?
If you have an idea for a new product, the first step is to establish what needs to be done, what the likely challenges are and how much you can realistically invest in the next stage.
You don’t need a complete specification or a large business behind you to start the conversation. However, you do need to be prepared to invest in professional development work if you want to turn your idea into a properly engineered product.
If you can explain what you want to achieve and provide an indication of your available budget, I can help you understand the likely next steps and identify a practical way forward.
A good idea is the starting point. Realistic planning, professional engineering and an appropriate investment give it the opportunity to become a successful product.
Contact me Paul Gocher at i-design to discuss your idea and the next steps towards developing it.
Fast Response
From brief to prototype in as little as 24 hours.
Highly Competitive
My charges are among the most competitive.
Experience
Over 25 years of expertise in product development and design.
Innovation
My designs consistently exceed client expectations.
