Many “free PDF” sites require you to disable ad-blockers, complete surveys, or download suspicious .exe files disguised as PDFs. These can infect your device with ransomware, keyloggers, or crypto miners.

As for the availability of a free PDF version, I couldn't verify the existence of a legitimate and freely accessible PDF copy of "Building Construction" by S.P. Arora and S.P. Bindra. However, you may be able to find the book on various online platforms, such as Amazon, Google Books, or library databases.

If your budget is zero, don’t turn to piracy. Instead, use these alternatives that cover the same syllabus: