Steve,
In your post you state as an add on service. Are you a contract cleaner or window cleaner.
I would say if you are a cleaner then Add it. We are commercial contract cleaners. But have had this service for a few years now. I personally have been CC over 10 years.
I have recently hit (Marketed) residential and have had a reasonable conversion rate. Which has already paid for new equipment and and a few months work for another operator. Within weeks.
Also you need to look at the market you are targeting. Is it residential or commercial. Obviously if you are hitting commercial then you will be limited to what you can do with a Partable. Well actually limited is the wrong word! With a portable it will take alot longer depending on the size of the area you need to clean. But I have got round this with portables! But does require use of a clients own water supply.
Also apart from a poprtable, if you are hitting commercial you will need to invest in a bonett system, there are many makes. The list is endless but I would say you would use this moreso for commercial.
Also get yourself some air movers. There blowers. To dry the carpets or upholstery.
And most importantly Insurance with Risk treatment. We manage fine with a few portables but you get frowned upon by the TM'ers we are just mare mortals. But you just have to take it. Also ignore them as you make them worse
But they are generally helpful.
Also consider Dry cleaning as well, TMs cant do that yet as far as a I am aware they have to use a seperate machine just like us mare mortals. But I am sure when they invent one that can remain in the van they will get it.
If you cant get a dry CC system then purchase a sebo for agitation.
Yes its saturated but the work is there. There is not much market that has not been saturated.
Quality is still a major player and the market is not saturated with Quality workmanship. Which will get you the work in itself.
Dave