Kathy Price-Robinson of LA Times' Pardon My Dust has a great post on Photographing your remodel: It's for your own good.
Photography shouldn't just be utilized for Before and After pictures, but also for "During" pictures.
You should do shots of your project every day; documenting the entire remodeling process and progression of events.
You will find the images handy down the road when you need to remember where that plumbing pipe runs.
You will also thank your prescience should you have a disagreement with your contractor.
Either way, take the pictures and file them away.
You might even include them in the document package you pass on to a new owner.