It's possible for a homeowner to replace their own roof in California, however it's not recommended. It requires specialized tools and knowledge of the area's building codes. Moreover, even if you believe you can do it yourself, there is still the risk that something could go wrong or you may end up with an inferior job.
Moreover, even if you were able to install the roof correctly, warranties on shingles or other materials are often voided if they are self-installed. Furthermore, most insurance companies won't cover any damage done by amateur work. Therefore, it would be wise to hire a professional roofer who has experience and knows local regulations for your project.
The best weather to replace a roof is not rain or snow. Instead, sunny and clear skies are ideal for this task. Summertime can be a great time for replacing a roof, as there are typically fewer clouds in the sky and more hours of daylight. Plus, warmer temperatures make it easier to work with asphalt shingles and other construction materials. However, even on days that appear to be sunny and pleasant, you should always check the forecast before beginning your project. Unexpected gusts of wind or sudden downpours can quickly ruin your progress.
Replacing a roof in California can be an expensive undertaking. It's important to consider the overall cost of replacement before making any decisions. Unfortunately, there is no one-size-fits-all answer to this question - the total cost of replacement will depend on a variety of factors such as materials used, size and complexity of the project, and labor costs.