Yes, as we print everything to order, based upon the dimensions provided to us we require the exact dimensions. We will then add on 1-2% to allow for any small measuring errors (mural orders only). From there we can get working on creating your dream temporary wallpaper! We have created an easy step by step guide for measuring your wall accurately - Measurement & Installation. We recommend that you give the exact dimensions of your wall, measured at the widest and highest part of the wall. We suggest measuring your wall at a variety of points to ensure you find the widest and highest points. You can add a little excess to your measurements if you would like some extra to allow for any other wall discrepancies.