few of simple 3D illustrations of building extensions

Information for the business: Residential Planning firm
Industry: Art and Design
Design details: Our firm is specialist at extensions and loft conversions of London housing. We would like few of digital 3D model made to show the addition to the buildings. These should be simple with not much details. Exmaple is below

http://plusrooms.co.uk/conversion/conversion-title-1/
http://plusrooms.co.uk/conversion/addison-gds-w14/
http://plusrooms.co.uk/conversion/freelands-rd-kt11/
Target audience: Home owners
Ideas for the visual style: http://plusrooms.co.uk/conversion/freelands-rd-kt11/
Things to avoid: Strong colours
Extra notes: Please apply if you are confident that you can do the job. Examples and portfolio of work are a must.Thank you