Here are the factors to consider when determining the pricing structure for building a website for a customer:

1. Type of website: e-commerce, corporate, personal blog, etc.
2. Customization level: custom design or template-based, amount of coding and development required.
3. Content creation: will you be writing website content, taking photos, or creating videos?
4. Complexity of features and functionality: online shopping carts, search engines, social media plugins, etc.
5. Timeframe: how long will it take you to build the site?
6. Geographical location: prices may vary based on the country or region the customer is located in.
7. Competition: research your competition to ensure your pricing is competitive.

Once you've considered each of these factors, you can then determine a fair and reasonable price for your services. You could charge the customer an hourly rate or provide a flat fee for the project based on the estimated number of hours it will take to complete. Make sure to include any additional costs such as hosting fees, domain registration fees, and ongoing maintenance fees if applicable.