Now you can design your own extension.
Download Sketchup.
SketchUp is 3D modeling software that’s easy to learn and incredibly fun to use. Download SketchUp today for free and get started drawing in 3D.
Download link: http://www.sketchup.com/download
There are literally hundreds of videos on ‘youtube’ that can help you to use Sketchup.
I drew this image using sketchup and then rendered it using ‘Kerkythea’ another free bit of software.

Loft Conversion in Wilmslow
This was the finished job.

New bath and towel radiator

New Shower, Bath and Towel Radiator in Wetroom

New Gable Window – Loft Conversion

Door and fitted wardrobes