One way to keep your interior design portfolio in top form is to plan ahead. Keep your portfolio up to date by keeping samples of your work as you build experience working as an interior designer. Each time you complete a project, remember to maintain copies of your work for your own usage. It's much easier to build your interior design portfolio as you go rather than having to find copies of your work once you're on the job hunt. Remember to always check with the policy of your employer on obtaining additional copies of your work for personal usage.