Hi Lynn,

All of our headboards are full boards, which means that there is a padded area above the mattress with a thinner flat board area behind the base. The thickness of the flat board area is in the region of 15mm although this may be increased by a further 10mm in respect of the fixing bolts. So the overall maximum that it will add the length is 25mm, which is around 1.25 inches.

I hope that this helps.

If you have any further questions please don't hesitate to contact the office on 0161 437 4419

Kind regards