I built a house (or more correctly I paid a company to build one for me). The initial design could be done using an interactive tool that you can use. This is

I built a house (or more correctly I paid a company to build one for me). The initial design could be done using an interactive tool that you can use. This is not different from web tools used to design a kitchen. I also think IKEA uses one. I live in Scandinavia so it is probably different from what you know. The company designing the house took our drawings and ideas and created drawings and an excel sheet they used to calculate the price of the project. A tool to do this would be valuable and same the customer some time ad I would be able to do most of the work designing the layout. After the contract is signed the company would make proper plans used for building the house etc.. The complexity of the whole project is enormous but the initial planning would be a good fit for an interactive tool.