Yes, there is still scaffolding in parts of the interior but much is still visible and I wouldn't let that prevent you from visiting. For up to date info on the state of renovation you can call the tourist office:

http://www.chartres-tourisme.com/en

I know of a person living in Chartres who has website devoted to Chartres and they recently posted info about work in progress at the cathedral. You can also contact this person through their website and I'm sure they'll tell you about the renovation work:

http://www.discover-chartres.com/

Aside from the cathedral the town itself has a very charming medieval section and some other places worth visiting, such as La Maison Picassiette:

http://www.chartres-tourisme.com/en/search/node/maison%20picassiette

I agree, the town is charming also. Thanks for the links.

Was there in 2009 when there was scaffolding blocking some of the windows and altar-I'd still recommend you visiting it. Make sure you go when the chairs are removed to see the labyrinth and walk its maze along with the other visitors, made me feel I was back in the Middle Ages along with the other pilgrims.

Another thing I found from Rick Steves is to go to the Information Center by the train station and pick up a map of the old city and do the self-guided walk of both the upper and lower town. Very quaint and picturesque walk by the river. We ate at a Steves recommended creperie-the owner had to show us his letter from Rick We were the only foreigners inside and ate crepes for both lunch and dessert. My dad and I still talk about those crepes. I enjoyed Chartres-especially in the spring before the tourist hoards.

The creperie was Le Trois Lys Creperie- highly recommended.