Their are various ways but if you contact the company who done your work they e-mail you a REVIEW request and you simply click the link.
That's the easiest way.
If you need more help let me know,
Projects that add value to your home - Phil Spencer
Looking to extend your home but don't know where to start? Property expert and Rated People ambassador, Phil Spencer, shares some thoughts on why loft conversions are such a popular way to create more living space and add value to your home.