[Tex/LaTex] Add vertical space into a chapter

sectioningspacing

I need to add extra vertical space before a particular chapter heading, for example "list of tables". I wanna do this because the space before some of the chapter headings are less than rest of the chapters. I tried adding \vspace*{1in} before \listoftables statement, but it did not work. Any help will be greatly appreciated. 

\documentclass[10pt, letterpaper]{report}
\usepackage{thesis}
\renewcommand\contentsname{TABLE OF CONTENTS}
\usepackage{titlesec}
\renewcommand{\chaptername}{CHAPTER}
\titlespacing*{\chapter}{0pt}{0.45in}{0.3in}
\titleformat{\chapter}[display]
        {\normalfont\Large\centering}{\chaptertitlename\ \thechapter}{0pt}{\Large\uppercase}
\titleformat{\section}{\large\bfseries}{\thesection}{1em}{}



\begin{document}
\tableofcontents

\addcontentsline{toc}{chapter}{LIST OF TABLES}
\renewcommand{\listtablename}{LIST OF TABLES}
\listoftables

\addcontentsline{toc}{chapter}{LIST  OF FIGURES}
\renewcommand{\listfigurename}{LIST  OF FIGURES}
\listoffigures


\chapter{INTRODUCTION}
Lorem ipsum .............
\end{document}

Best Answer

Since you are already using titlesec, use \titlespacing* to add the extra space just before \listoftables and then use the command again to restore the default vertical spacing:

\documentclass[10pt, letterpaper]{report}
\usepackage{thesis} % to make the example compilable for everyone
\renewcommand\contentsname{TABLE OF CONTENTS}
\usepackage{titlesec}
\renewcommand{\chaptername}{CHAPTER}
\titlespacing*{\chapter}{0pt}{0.45in}{0.3in}
\titleformat{\chapter}[display]
        {\normalfont\Large\centering}{\chaptertitlename\ \thechapter}{0pt}{\Large\uppercase}
\titleformat{\section}{\large\bfseries}{\thesection}{1em}{}

\begin{document}
\tableofcontents

\addcontentsline{toc}{chapter}{LIST OF TABLES}
\renewcommand{\listtablename}{LIST OF TABLES}
\titlespacing*{\chapter}{0pt}{1.45in}{0.3in}% add extra vertical spacing
\listoftables

\titlespacing*{\chapter}{0pt}{0.45in}{0.3in}% restore original vertical spacing
\addcontentsline{toc}{chapter}{LIST  OF FIGURES}
\renewcommand{\listfigurename}{LIST  OF FIGURES}
\listoffigures


\chapter{INTRODUCTION}
Lorem ipsum .............
\end{document}
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