Most small business owners wait until a revenue stream is fully baked before they test it. They build the product, hire the staff, set up the systems, then launch, and hope it works. That approach is expensive, slow, and almost always wrong.
There is a smarter way: run a side project first. A side project is a low-cost, low-commitment experiment you run in parallel with your core business to test whether a new idea has real demand before you invest serious time or money into it. Done right, it is one of the most powerful growth tools available to a small business owner.
This guide breaks down exactly how to do it.
Why Side Projects Beat Big Launches
The traditional approach to adding a revenue stream goes something like this: have an idea, develop it fully, spend money on branding and setup, launch publicly, and see what happens. The problem is that by the time you find out whether anyone actually wants it, you have already sunk thousands of dollars and months of effort into it.
A side project flips that sequence. Instead of building first and testing second, you test first and build only if the test works. You are essentially buying information cheaply before committing to the full investment.
This is not a new idea. It is the principle behind the minimum viable product, the lean startup methodology, and every smart entrepreneur who ever ran a pilot before scaling. But most small business owners do not apply it to their own growth, and they pay for that gap.
Step 1: Identify the Revenue Idea Worth Testing
Not every idea deserves a side project. You are looking for ideas that meet a few criteria:
- Adjacent to what you already do. The best side projects leverage existing customer relationships, skills, or infrastructure. A landscaping company testing a seasonal cleanup bundle is a natural extension. A landscaping company testing a coffee subscription is not.
- Testable without full commitment. If building the minimum version of the idea requires six months and $50,000, it is not a side project, it is a second business. Look for ideas you can test with a few hundred dollars or a few weekends of effort.
- Solving a real problem you have heard from customers. The strongest side projects start with a pain point your existing audience has already expressed. You are not inventing demand, you are responding to it.
Brainstorm three to five ideas and narrow to the one that scores highest on all three criteria. That is your side project candidate.
Step 2: Define What “Working” Looks Like Before You Start
This is the step most people skip, and it is the one that matters most. Before you run your test, define the specific outcome that would make you say yes, this is worth building out.
That threshold will look different depending on your idea:
- If you are testing a new service offering, success might be landing three paying clients within 30 days at a price that makes sense financially.
- If you are testing a digital product, success might be 20 sales within the first two weeks at full price with no discount.
- If you are testing a new workshop or event format, success might be selling out the first session without spending money on ads.
Write this down before you begin. If you do not define success in advance, you will rationalize the results to fit whatever happened. You need a clear line to cross or not cross, so the test actually tells you something.
Step 3: Build the Smallest Possible Version
Your goal is to create the minimum thing that would allow a real customer to pay real money for real value. Nothing more.
If you are testing a new service, that might mean offering it to a handful of your existing clients without any new branding, systems, or staff. If you are testing a digital product, it might mean a simple PDF or recorded video, not a full online course platform. If you are testing a physical product, it might mean hand-assembling the first ten units yourself rather than ordering inventory.
Resist the urge to polish. Polishing before you have validated the idea is the most common and costly mistake in this process. You are not trying to impress anyone yet. You are trying to learn. A rough, real product that gets in front of real customers is worth infinitely more than a beautiful product no one has seen. If you want a deeper framework for building lean, check out our guide on how to build a minimum viable product for your small business.
Step 4: Sell It Before You Scale It
One of the most powerful tests you can run is called a pre-sale. Before you build anything, tell your best customers exactly what you are thinking about offering and ask them to pay a deposit to reserve a spot or a unit. If they say they love the idea but will not pay, the idea has a problem. If they hand you money, you have proof of concept.
You can run a pre-sale through a simple email to your existing list, a direct conversation with five to ten current clients, a social media post with a payment link, or a basic landing page. None of these require a full infrastructure build. They require you to get out of your own head and into a real conversation with people who might actually pay.
If you are already thinking about how a new revenue stream fits into a broader growth strategy, our guide on how to build a second revenue stream for your small business covers the strategic side in depth.
Step 5: Run the Test With a Time Limit
Give your side project a defined window. Thirty days is usually enough for most service or product tests. Sixty days for anything with a longer sales cycle. Set a hard end date and stick to it.
During the test, your only job is to get the offer in front of the right people and track what happens. Keep meticulous notes. How many people said they were interested? How many actually paid? What objections came up most often? What did paying customers say they loved about it?
This data is the whole point. Even a failed test teaches you something valuable, whether that is that the price is wrong, the audience is wrong, or the idea itself needs a pivot. That learning costs you 30 days and a few hundred dollars instead of six months and your savings.
Step 6: Decide Clearly — Kill It, Iterate, or Scale
When the test window closes, hold a one-hour review. Compare your results against the success threshold you defined in Step 2. Then make one of three decisions:
- Kill it. The test did not hit the threshold. The idea does not have the demand you hoped for, at least not in this form or for this audience. Move on and test the next idea. This is a win, not a failure. You saved yourself from a much more expensive mistake.
- Iterate. The test showed real interest but not at the threshold level, or you learned something that suggests the core idea is right but the execution was off. Adjust the offer, the price, the audience, or the format and run another 30-day test.
- Scale. You hit or exceeded your threshold. Now you build the real infrastructure, create the proper systems, and fold this into your main business as a genuine revenue stream.
The key is that you commit to one of these three outcomes. Do not keep a zombie side project alive out of emotional attachment. Either the numbers support moving forward or they do not.
How to Keep the Side Project From Consuming Your Core Business
The biggest practical risk of running a side project is losing focus on the core revenue that already pays your bills. Here is how to protect against that:
- Cap your weekly time investment. Decide in advance that you will spend no more than five to ten hours per week on the side project. If you cannot test it within that constraint, the test is too complex.
- Use existing channels first. Reach your existing customers before trying to find new ones. Selling something new to people who already trust you is ten times easier than starting from scratch.
- Apply the 80/20 rule ruthlessly. During the test period, make sure at least 80 percent of your effort still goes to your core business. The side project gets 20 percent or less. Our guide on how to use the 80/20 rule to grow your small business breaks down how to apply this framework across everything you do.
What the SBA Says About Business Diversification
The U.S. Small Business Administration recommends that business owners look for ways to diversify revenue as a core part of long-term resilience planning. Their financial management resources are worth reviewing if you are thinking carefully about how a new revenue stream fits into your overall financial picture.
Real Examples of Side Projects That Became Core Businesses
Some of the most successful revenue streams in small business history started as side experiments. A local bookstore that started selling monthly book boxes to a small email list. A freelance graphic designer who tested a logo template pack on Etsy before building a full digital product business. A restaurant owner who tested a catering menu at one corporate event before launching a full catering operation.
None of these owners quit their core business to pursue the new idea. They tested quietly, proved demand, then scaled deliberately. That sequence, test, prove, then build, is the difference between smart growth and expensive guessing.
The Bottom Line
Running a side project to test a revenue idea is not a sign that you are not serious about growing. It is a sign that you are serious enough about it to do it right. The businesses that grow fastest are usually the ones that test fastest, which means failing faster at small scale so they can win bigger at full scale.
Start with one idea. Define success. Build the minimum version. Sell it before you scale it. Give it 30 days. Then decide.
That process, repeated over time, is one of the most reliable paths to a more resilient, diversified, and profitable small business.
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