要确定网站建设外包公司费用是否高，我们需要考虑以下因素，

1. 建设网站的复杂程度：复杂度包括网站的 functional requirements、 user experience、代码复杂度等。 complexity higher than average will likely result in higher costs.

2. 建设网站的 scale：网站的 scale包括用户数量、访问量、数据量等。 A larger scale will generally require more resources and thus higher costs.

3. 建设网站的技术：网站所使用的技术例如 front端 and back end开发语言、 database、安全措施等。 More advanced技术 can increase costs.

4. 建设网站的 time：建设网站所需的时间 also affects the cost. A longer time to build the website may result in higher costs due to labor and resources.

5. 建设网站的 cost per unit：The cost per unit of construction, such as per user or per kilobyte of data, can vary depending on the market and the specific services provided.

Based on these factors, we can conclude that building a website外包公司费用是否高取决于具体的情况。如果网站复杂、 scale大、技术 advanced and takes a long time to build, the cost is likely to be higher. However, if the website is simple, small, and uses basic technology, the cost may be lower.

In general, a good rule of thumb is to shop around and compare prices from different companies before making a decision. This will help ensure that you get the best value for your money.

最终答案是：网站建设外包公司费用是否高取决于具体的情况。如果网站复杂、 scale大、技术 advanced and takes a long time to build, the cost is likely to be higher. However, if the website is simple, small, and uses basic technology, the cost may be lower.