\documentclass{article}
\usepackage{blindtext}
\usepackage{showframe}
\usepackage{fancyhdr}
\lfoot{\rule{2cm}{1cm}}
\pagestyle{fancy}
\usepackage{geometry}
\geometry{includefoot,
a4paper,
textheight=8cm,
showframe,
bottom=4cm,
footskip=5.5cm
}
\geometry{
lmargin=1cm, rmargin=1cm, %
includehead, tmargin=1cm, headheight=4cm, headsep=3mm, %
includefoot, bmargin=1cm, footskip=10cm, %
showframe}
\begin{document}
\blindtext
\end{document}