Judging by the number of conservatories we are selling, it would appear that most people are investing in one rather than moving to a larger house. After all, think of the advantages of building your own Prior DIY conservatory!
Fistly, think of the money you can save over having one built for you at vast expense. Think of all of that lovely extra space you would gain, and the fact you could be 'in' your garden all year round. Come Christmas time, you could shut all of those annoying relatives in the house and shut yourself off from them with the beautiful PVCu French doors that lead into the conservatory. They will soon find out how secure they are!
But the key advantage would be this - if you build a large enough one, you will have far less lawn to mow!