You can set the desired size of the figure. For example:
figure(1); % Figure 1 with out colorbar
surf(peaks);
% Get Position of the figure 1
pos = get(gcf, 'Position'); % gives x left, y bottom, width, height
x = pos(1); y = pos(2); w = pos(3); h = pos(4);
figure(2); % Figure 2 with colorbar
surf(peaks);
colorbar;
% Set Position with desired width w_new = w*1.1
set(gcf, 'Position', [x, y, w*1.1, h])
Then, you can adjust according to your wishes.
