Hello. My name is Andrey.
I have been developing only accounting systems for 5 years. And i have been developing projects as your.
I have some questions about essence of your project:
1. What is format of documents that you want to download from program ?
2. What are data(please list it) that you input in program ? Clients, orders, nomenclature, etc.
3. Who will work with software ? the only you or someone else ?
4. How many houses do you build per year, month ? It is essential for the size of database.
5. Are you going to work with software on laptop, personal computer, mobile devices ?
Answers of these questions will allow me to create estimate for your project.
Thanks.