I wanted to write this article now because I was recently contacted by an insulation company, and it seems that the summer is the best time to insulate your home, because generally people only think about adding insulation when the weather is cold and so more business means higher costs. It is therefore less expensive to insulate when the companies have less customers and you can negotiate a good price.
I found this image also that lists the approximate costs of insulation thay you can use as a guide. Remember too that good insulation keeps you warm in winter, cooler in summer, and helps to reduce problems with mould and damp.
Check out the image below and I would be interested to hear your comments.