As a very rough estimate, an individual can expect to pay approximately ¥10,000 per month and a family up to ¥30,000 per month for utilities (water and sewage, gas, electricity). Broadband internet will likely cost an additional ¥4,000-¥5,000/month. Your bills could be substantially less or substantially more than this, depending on how much you use an air conditioner during summer, and a heater in winter, etc.