Make a list of rules for the house. Use you must, you mustn't and you needn't. Think about these things: - food shopping - music - visitors - cleaning - gardening - furniture and decoration - pets - security

Rules for the house:

• Food shopping: You must plan meals together to avoid waste. You mustn't buy too much junk food. You needn't worry about buying exotic ingredients.
• Music: You must use headphones after 10 PM. You mustn't play loud music when someone is studying. You needn't buy a new sound system.
• Visitors: You must inform housemates at least a day in advance. You mustn't have overnight guests without agreement. You needn't apologize for not being able to host everyone all the time.
• Cleaning: You must clean up after yourself immediately. You mustn't leave dirty dishes in the sink. You needn't do deep cleaning every day, but a weekly roster is a must.
• Gardening: You must water the plants regularly. You mustn't pick the flowers without permission. You needn't be a professional gardener to help out.
• Furniture and decoration: You must ask before rearranging furniture. You mustn't buy new items without discussion. You needn't stick to one style; compromise is key.
• Pets: You must ensure pets are well-behaved and don't disturb others. You mustn't bring a new pet without unanimous consent. You needn't be an animal lover to tolerate them if they are well-managed.
• Security: You must lock all doors and windows when leaving. You mustn't give spare keys to anyone outside the house. You needn't install an expensive alarm system, but basic precautions are essential.