While admittedly not an emergency of the dire sort, a pest in your home is still an unwanted guest, and pests in Colombo come in all shapes and sizes. Do not be alarmed if you run into a few critters and creepy crawlies when you first move into your home, especially if it has been uninhabited for a while. T&T advise that you get your place done inside and out for such things as ants, cockroaches and mosquitoes (these are the most common pests). No harm having mice and rat traps set up in the garden as well.
Snakes are a somewhat common feature to Colombo, especially when you get farther from the city centre. Mostly though, it is the rat snake that you will come across, which looks a lot scarier than it is. In actuality, it is non-venomous and will not attack unless it feels threatened. If you do see a snake and are unsure what it is though, DO NOT go near it. Call for help: either a neighbour or pest control. Seriously
A couple of pest control companies and their details are below: