Hey if you can stand ironing other people's clothes as well as your own I say go for it.
My mother used to do ironing for extra cash when I was at school. I think your rates are extremely reasonable. In fact it is a bargain - especially considering my mum charged a similar rate about 10 years ago, which was considered cheap.
I do have a few suggestions to make sure you are not taken advantage of:
- Stipulate that baskets need to be level
- If the level basket takes you more than your estimated 1.5hours because of a surplus of fiddly items, that an extra charge applies (eg $10 per extra half hour required)
- If they want you to use starch (eg on business shirts) that they need to provide their own - otherwise that gets expensive for you
- ensure they provide their own hangers
Obviously you should do as you think is right, but from my mums experience (which was mostly positive) a few guidelines are good to have to prevent your getting one basket piled with 2 baskets worth of clothes with the expectation that it should total at $30. Otherwise I would consider charging by the hour.
Hope it goes well! All the best.