It gives me a great pleasure to present this book of Building Electrification to the student of Electrical Engineering especially 5th Semester students of Diploma students of West Bengal.This book is written as per the revised syllabus of WBSCTVESD. This subject is newly introduced in Electrical Engineering branch. This subject is split into 7 important units which an Electrical Engineering student must deeply study. The subject starts with very rudimentary and in the intermediate students will lean to design, estimate and costing of various electrical installations, and at last in end with Indian Electricity rule 1956.This content are supported by various colour full picture, electrical drawing, graphs, and chats, models to make reader easy and interesting.This subject is very vast, but I have tried to written in brief, the point for the sack of students and as well for the professionals who have shortage of time.I have tried by level best to cover entire syllabus, and put stress on the important of the syllabus. Students, readers, teachers are as requested to put your valuable suggestion to progress the content of this book.