How to build a side business while working full time

It’s 21:40 on a Wednesday. You’ve had a full day at work, dinner’s done, and the laptop with your side business is right there. So is the sofa. And Netflix. And the very reasonable thought that you’ll do it properly on Saturday.

Building something next to a full-time job is hard, but it’s not a lesser path. Here’s how to make real progress without burning out.

Is keeping your job a cop-out?

Not at all. Researchers Joseph Raffiee and Jie Feng (2014) studied thousands of new entrepreneurs in the US. People who started their business while keeping their job, and only quit once it was running, were much more likely to survive than people who went straight from a job into full-time self-employment. The authors think the side phase gives you time to learn.

A fair caveat: this was an observational study, and the same researchers found that more cautious people are more likely to start on the side, which may explain part of the difference. But the practical upsides are real: a steady income, time to test whether anyone actually wants what you’re building, and no pressure to take every bad deal just to pay the rent.

First: check your contract

Many employment contracts have rules about side work, competing with your employer, or who owns what you create. Read yours, and if you’re unsure, ask HR or get advice before you launch. It’s a boring step that prevents very exciting problems.

6 ways to make it work

1. Set a realistic time budget

Decide how many hours a week you can actually give, not how many you wish you had. For many people it’s around six: two evenings of 90 minutes and a three-hour Saturday morning. Write it down. A small, honest budget you keep beats an ambitious one you abandon in week three.

2. Fixed slots beat leftover time

“When I have time” never comes. Put your slots in the calendar like meetings: “If it’s Tuesday at 19:30, then I work on the shop for 90 minutes.” If-then plans like this clearly improve follow-through (Gollwitzer and Sheeran, 2006).

3. One main goal per month

With six hours a week, you can’t do everything. Pick one outcome per month: “Ten customer conversations”, “Landing page live”, “First paid order”. Specific, challenging goals beat “do your best”, one of the most solid findings in goal research (Locke and Latham, 2002).

4. Protect your energy

Your best hours matter more than your total hours. Some people do their hardest side-project work before their day job; others are useless before 9. Notice which you are. Keep at least one evening a week completely free, and protect your sleep. Running two things on empty works for a month, not for a year.

5. Talk to customers early

The biggest waste of side-project hours is building something nobody asked for. Before you polish, talk to the people you want to serve, and try to sell a small first version. A few conversations can save you months of evenings.

6. Report to someone every week

Nobody at your day job cares whether the side business moved this week, so find someone who does. A meta-analysis of 138 studies (Harkin and colleagues, 2016) found that monitoring your progress helps, and helps more when you report it to others. A five-minute Sunday message works: “Planned: 3 slots. Did: 2. Next week: the pricing page.”

When is it time to quit the job?

There’s no magic number, and this isn’t financial advice. But many people wait for a few signals at once: the business has brought in steady income for several months, you have a savings buffer you’re comfortable with, and you’re regularly turning down work or opportunities because you don’t have the time. Until then, the job isn’t holding you back. It’s funding your experiment.

Find someone who gets it

The best partner for a side project is someone else building one. They know the Wednesday-evening feeling, and they won’t accept “I was busy” as a weekly update. Pactful pairs you by hand with someone who’s working on a goal of their own, ideally close by. We’re starting in Hamburg, Amsterdam, Rotterdam, The Hague and Utrecht. Our guide on what accountability looks like for you two helps you set it up.

Join the waitlist. It takes less time than one Wednesday evening.