New Zealand Law
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Generally when you are an employee, all intellectual property developed for the employer remains with the employer when you leave. The Copyright Act makes it clear that anything developed as an employee belongs to the employer. As a contractor this is not necessarily the case but it may depend on whether you were a genuine independent contractor or whether in fact you were an employee, in all respects say that you were paid on invoice. In addition your contract with your employer may have some provision about intellectual property. But it is more likely to belong to the company than to you.
The issue with regard to the subdivision is in fact separate from the employment. This would be a separate contract, in which you obtained the property using your own resources, and they agreed to pay the build contract commission. This would survive the end of your contract or your employment. So if they refuse to pay then you can bring a claim against them, depending on the amount, in the disputes Tribunal up to $15,000, and in the District Court beyond that.