Cfrgtkky

I have this code

% !TeX encoding = UTF-8



documentclass[utf8]{article}

usepackage{multirow}



begin{document}

    begin{table}[htp]

        centering

        begin{tabular}{|l|c|c|}

            hline

            & Weighting & Cost ($)         \ hline

            multirow{5}{*}{Material costs}       & 0           & $[10000,,infty[$  \ cline{2-3}

            & 1.25 & $[7500,,10000[$ \ cline{2-3}

            & 2.5 & $[5000,,7500[$ \ cline{2-3}

            & 3.75 & $[2500,,5000[$ \ cline{2-3}

            & 5 & $[0,2500[$ \ hline

            multirow{5}{*}{Labor costs} & 0           & $[40000,,infty[$  \ cline{2-3}

            & 1.25 & $[30000,,40000[$ \ cline{2-3}

            & 2.5 & $[20000,,30000[$ \ cline{2-3}

            & 3.75 & $[10000,,20000[$ \ cline{2-3}

            & 5 & $[0,10000[$ \

            hline

        end{tabular}

        caption{Scale for the cost of the project}

        label{tab:project_cost}

    end{table}



end{document}

It produces this:

As you can see, the margins in the cells are way too small. We can even say it's non existent, so it's really hard to see the brackets ([)

How can I increase the margins?

In this case a simple arraystretch redefinition suffices.

% !TeX encoding = UTF-8



documentclass[utf8]{article}

usepackage{multirow}

begin{document}

    begin{table}[htp]

        renewcommandarraystretch{1.3}

        centering

        begin{tabular}{|l|c|c|}

            hline

            & Weighting & Cost ($)         \ hline

            multirow{5}{*}{Material costs}       & 0           & $[10000,,infty[$  \ cline{2-3}

            & 1.25 & $[7500,,10000[$ \ cline{2-3}

            & 2.5 & $[5000,,7500[$ \ cline{2-3}

            & 3.75 & $[2500,,5000[$ \ cline{2-3}

            & 5 & $[0,2500[$ \ hline

            multirow{5}{*}{Labor costs} & 0           & $[40000,,infty[$  \ cline{2-3}

            & 1.25 & $[30000,,40000[$ \ cline{2-3}

            & 2.5 & $[20000,,30000[$ \ cline{2-3}

            & 3.75 & $[10000,,20000[$ \ cline{2-3}

            & 5 & $[0,10000[$ \

            hline

        end{tabular}

        caption{Scale for the cost of the project}

        label{tab:project_cost}

    end{table}



end{document}

ORIGINAL APPROACH

I just added a >{} directive to a column that adds a strut that has been padded by 2pt above and below. Requires array package for the >-directive functionality, and stackengine to pad the strut by 2pt.

However, the OP noted that this approach combined with the multirow causes the first column to not be vertically centered.

% !TeX encoding = UTF-8



documentclass[utf8]{article}

usepackage{array,multirow,stackengine}



begin{document}

    begin{table}[htp]

        centering

        begin{tabular}{|>{addstackgap[2pt]{strut}}l|c|c|}

            hline

            & Weighting & Cost ($)         \ hline

            multirow{5}{*}{Material costs}       & 0           & $[10000,,infty[$  \ cline{2-3}

            & 1.25 & $[7500,,10000[$ \ cline{2-3}

            & 2.5 & $[5000,,7500[$ \ cline{2-3}

            & 3.75 & $[2500,,5000[$ \ cline{2-3}

            & 5 & $[0,2500[$ \ hline

            multirow{5}{*}{Labor costs} & 0           & $[40000,,infty[$  \ cline{2-3}

            & 1.25 & $[30000,,40000[$ \ cline{2-3}

            & 2.5 & $[20000,,30000[$ \ cline{2-3}

            & 3.75 & $[10000,,20000[$ \ cline{2-3}

            & 5 & $[0,10000[$ \

            hline

        end{tabular}

        caption{Scale for the cost of the project}

        label{tab:project_cost}

    end{table}



end{document}

Another possibility with cellspace, which defines a minimal vertical padding for cells in columns with specifier prefixed with the letter S (or C if you load siunitx):

documentclass[utf8]{article}

usepackage{multirow}

usepackage{amsmath} 

usepackage{cellspace}

setlength{cellspacetoplimit}{4pt}

setlength{cellspacebottomlimit}{3pt}



begin{document}

    begin{table}[htp]

        centering

        begin{tabular}{|l|>{$}Sc<{$}|>{$}Sc<{$}|}

            hline

            & text{Weighting} & text{Cost ($)} \ hline

            multirow{5}{*}[-12pt]{Material costs} & 0 & [10000, infty[ \ cline{2-3}

            & 1.25 & [7500, 10000[ \ cline{2-3}

            & 2.5 & [5000, 7500[ \ cline{2-3}

            & 3.75 & [2500, 5000[ \ cline{2-3}

            & 5 & [0,2500[ \ hline

            multirow{5}{*}[-12pt]{Labor costs} & 0 & [40000, infty[ \ cline{2-3}

            & 1.25 & [30000, 40000[ \ cline{2-3}

            & 2.5 & [20000, 30000[ \ cline{2-3}

            & 3.75 & [10000, 20000[ \ cline{2-3}

            & 5 & [0,10000[ \

            hline

        end{tabular}

        caption{Scale for the cost of the project}

        label{tab:project_cost}

    end{table}



end{document}