[Tex/LaTex] Make titlepage one-sided (centered) while all other pages are two-sided

Question

I am using scrbook to write a small paper. I am trying to create a title page which displays its contents (title, author, institution) with a one-sided layout, while all other pages should use a two-sided layout. I couldn't come up with an easy solution. I use the following macro to define my title page:

\newenvironment{tpage}[3]{
  \begin{titlepage}
    \title{#2}
    \subtitle{#3}
    \date{City, den \today}
    \author{#1}

    \titlehead {
      \begin{minipage}[b]{0.6\textwidth}
        Institution\\
      \end{minipage}
      \begin{minipage}[b]{0.4\textwidth}
        \begin{flushright}
          \includegraphics[scale=0.5]{somelogo.pdf}
        \end{flushright}
      \end{minipage}
      \hrule
    }

    \maketitle
  \end{titlepage}
}{}

I'd like to stick with that macro if possible. Is there a simple command to switch from a onesided layout to a twosided layout? Something like \oneside? I didn't find such a command. My documentclass is configured as follows:

\documentclass[a4paper,
, 12pt
, titlepage
, toc=listofnumbered
, bibliography=totoc
]{scrbook}

Answer 1

Please provide full examples.

Do you use the package geometry?

Here a solution with KOMA:

\documentclass[a4paper,
, 12pt
, titlepage
, toc=listofnumbered
, bibliography=totoc
,  demo
]{scrbook}
\usepackage{graphicx}
\newenvironment{tpage}[3]{%
\KOMAoptions{twoside = false}
  \begin{titlepage}
    \title{#2}
    \subtitle{#3}
    \date{City, den \today}
    \author{#1}

    \titlehead {
      \begin{minipage}[b]{0.6\textwidth}
        Institution\\
      \end{minipage}
      \begin{minipage}[b]{0.4\textwidth}
        \begin{flushright}
          \includegraphics[scale=0.5]{somelogo.pdf}
        \end{flushright}
      \end{minipage}
      \hrule
    }

    \maketitle
  \end{titlepage}
\KOMAoptions{twoside}
}{}

\usepackage{lipsum,showframe}
\begin{document}

\tpage{Author}{TITLE}{SUBTITLE}
\lipsum

\end{document}