As long as your past customers have had a positive experiences with your service, testimonials are pretty hard to mess up, but here are some ways to make them great:
Checkatrade profile
Many businesses already have an online review system with an independent company like Checkatrade, Rated people or Trustatrader, but forget to make reference on their website. Your current rating and connection to this body should be a highlight of any testimonial page, using their logo and a hyper link to your profile page with them.
Images
If the customer can visualize that experience as opposed to just reading about it, the pitch is all the more compelling. Websites that have imageless testimonials are really wasting that space, because the immediate reaction of most visitors will be one of scepticism. If I can see the person or the finished project, I can more easily imagine getting genuine value from it. So take high quality images and attach those to the review.
Video
Another thing to consider is the use of video.Video testimonials are even more effective for visualizing the experience you’re selling. It can be done with a camera phone or have a professional voice over added afterwards.
Page Placement
Whether you decide to go with photographs or video, placing your testimonials in a functionally sensible location will play a role in their effectiveness. When visitors come to your website, the testimonials shouldn’t be the first thing they see. They will need to know about your Goods and services first before they see your past customers gushing about your business. Remember just using thumbnail images will not do, they need to be the width of the full page, and they’ll want the option to enlarge it once they start looking closer.