You can absolutely choose a non-BlikOpWerk language school for your inburgering, but first confirm that it meets DUO's requirements if you plan to use the DUO loan. BlikOpWerk is a quality mark that some schools have, not a legal requirement for all inburgering routes. The key is to check whether your chosen school is recognized by DUO for the loan and whether its program prepares you for the B1 exam within your three-year window.
BlikOpWerk is often recommended because it signals that a school meets certain quality standards set by the Dutch government, including qualified teachers and a structured curriculum. However, it is not the only path. Many non-BlikOpWerk schools offer good in-person lessons, and some may be cheaper. The trade-off is that you need to do more due diligence yourself. Look for schools that: (1) are registered with DUO if you want to use the loan, (2) have a clear plan to get you to B1, (3) employ qualified teachers with experience teaching Dutch as a second language, and (4) offer in-person classes that fit your schedule.
Since you are employed and need in-person lessons, prioritize schools that offer evening or weekend classes and are easily accessible from your home or work. Ask about class size, the number of contact hours per week, and whether they include exam preparation for the inburgering exams (reading, writing, listening, speaking, and KNM). Also ask about their success rates: how many of their students reach B1 within the expected time?
Before committing, check with DUO directly about whether a specific school is eligible for the loan. The DUO website lists recognized schools, and you can also call them to confirm. If you choose a non-BlikOpWerk school that is not DUO-recognized, you will pay out of pocket, so factor that into your decision.
A practical next step: make a shortlist of 3-4 schools, visit them in person, and ask the questions above. Compare their answers, not just their prices. Also consider joining a free trial lesson if offered. Finally, remember that your progress depends heavily on your own effort outside class, so choose a school that encourages speaking practice and gives homework feedback. If you are looking for additional free resources to supplement your lessons, Dutch Fluency offers some useful listening materials, but your main focus should be on a structured in-person course.