How much can be trimmed off these doors? (1 answers) I have a non-standard size door to replace, an opening of 2000 by 784mm. So i'd need to trim door by 10mm from top/bottom (20mm total) and 13-14mm from each long side (28mm total). Is this possible with these doors? Answer This A Answers The maximum that you can trim off these is 5 mm all round