Are there any places in Kathmandu to drop off laundry with same day service?
Hotels will do it for you.
A said, your hotel can organise it or you can take it to a laundry service. In Thamel you will see lots of yellow laundry signs. The laundries themselves are not in Thamel so your stuff is sent away and can take time - if a same day service is essential check carefully that they will be back. Some larger hotels might do the laundry in house which would take some of the uncertainty out of the situation for a higher price.
Delicate fabrics don't always come back in good condition!
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I saw some 3 hour / same day services as well. Normal rates are NPR 50 - 100 for a KG, same days or 3 hour services are probably a bit expensive than normal rates.
Agree in the main by what has already been posted
The Laundry Services in Thamel tend to be around ½ the price of what is charged at hotels, so, especially if you are on a budget, or have a lot of washing (Post Trek for instance) then it’s worthwhile using and one – One small scam to look out for is that the scales often used by Thamel laundries weigh Very High – So if you can weigh your laundry before you take it, or at least have a good idea of the weight, you won’t risk being ripped off ;-)
Good Luck and Happy Safe Travels
Laundry prices tend not to rise and stuck at 50 rupees per kg for many years (has it increased?) but kilogrammes changed instead. One way of checking the accuracy of scales is to weigh a litre bottle of water; 1 litre = 1 kg. This will give an indication at least - the water will not be exactly a litre, the weight of the bottle (minimal admittedly) and the inaccuracy with spring balances might not be linear for the weight range. It might allow you to identify the grossest distortions and walk away. Then again, this effort might be disproportionate to the money involved!
Do the hotels wash by weight or item? It seems that US hotels charge around $3 for a pair of socks, $5-7 for a shirt. I swear the socks come back ironed on a hangar though. Its going to be several days of travel to get to Kathmandu do it will be nice to get everything cleaned when I get there. I was hoping for self serve machines at the hotel, but I guess those don't exist.
What you pay for a shirt in the US gets the whole bagful of laundry washed in Kathmandu. I have never really given much thought to what it costs. Cheap. If you want to save 1-2 bucks, take it to laundry service yourself.